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Journey into the Top 10 Vulnerabilities Used by Ransomware Groups

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 1. Home
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 3. Journey into the Top 10 Vulnerabilities Used by Ransomware Groups


JOURNEY INTO THE TOP 10 VULNERABILITIES USED BY RANSOMWARE GROUPS

by SOCRadar XTI
June 22, 2023

Once upon a time, in cyberspace, a menacing threat emerged. It would forever
change the landscape of digital security. This threat was ransomware. It is a
wicked force capable of wreaking havoc on individuals, organizations, and even
entire nations. Its power lies in the ability to encrypt valuable data. Imagine
someone sneaking into your digital kingdom. They lock away your valuable
information and demand a hefty ransom to set it free. It is a nightmare that
comes to life.

In recent years, these ransomware attacks have become more common and dangerous.
Like an unstoppable force, these sneaky attacks swept across the digital realm.
It left a trail of destruction in their wake, from hospitals struggling with
life-or-death situations to critical infrastructure systems. They all brought to
their knees. The consequences were dire, and the financial gains for the
attackers were significant. The attackers knew how to exploit weaknesses in our
computer systems. They preyed on weaknesses in our software. It was no wonder
that ransomware attacks became an alluring prospect for malicious actors
worldwide.

But how did these cyber criminals manage to penetrate the defenses of their
targets? The answer lay in exploiting vulnerabilities that plagued various
systems and software. With precision, these nefarious individuals scoured the
digital landscape. They searched for weaknesses to exploit. Their success hinged
on the negligence of individuals and organizations in implementing timely
security patches or updates. It left the doors wide open for the ransomware
onslaught.

In our tale, we journey deep into the heart of the ransomware realm. We shine a
light on the top 10 vulnerabilities that these malicious groups often exploit
alongside the statistics behind their use of vulnerabilities. Each
vulnerability, like a crack in the armor of a mighty fortress, offered an entry
point for the ransomware invaders. We uncover the impact of these
vulnerabilities. We peer into the preferred techniques employed by the
ransomware groups.

But fear not, for our quest is not despair but empowerment. Armed with
knowledge, we seek to equip individuals and organizations with the necessary
means, which they need to fortify their digital defenses against the looming
threat of ransomware attacks. Whether you’re an IT professional or a business
owner, understanding these vulnerabilities will be your first line of defense.

As we navigate this dangerous path, SOCRadar Extended Threat Intelligence
platform guides us. It provides us with invaluable information. Like a wise and
vigilant companion, this platform keeps us informed about the vulnerability and
threat actor data. With SOCRadar by our side, we gain deeper insights into
the tactics and techniques of the ransomware groups. It gives us a better chance
to outsmart them.

So, join us on this epic adventure as we uncover the dark secrets behind
ransomware attacks and discover effective ways to fight back. With the guidance
of SOCRadar Extended Threat Intelligence platform, we’ll navigate the dangers of
outdated software and misconfigured systems. We will learn how to protect
ourselves against the ever-present threat of ransomware. In a world where cyber
threats are constantly evolving, knowledge and preparedness, along with the
support of trusted allies like SOCRadar, are our greatest weapons. The battle
against ransomware begins now.


STATISTICS BEHIND THE VULNERABILITIES USED BY RANSOMWARE GROUPS

Vulnerabilities Associated with Ransomware Groups by Year

Certain years stand out as pivotal moments in the annals of cyber warfare. Among
these, the years 2021 and 2022 shine brightly. They provided the lion’s share of
the arsenal wielded by these nefarious adversaries.

In 2021, the battlefield witnessed a dramatic surge in ransomware attacks. The
ransomware groups, fueled by a staggering array of 42 newly discovered Common
Vulnerabilities and Exposures (CVEs), seized the opportunity to exploit
weaknesses in systems and software. Among these was one of the most infamous
vulnerabilities, the Log4Shell. With each successful breach, their audacity
grew. It was a year that gave birth to unprecedented challenges for defenders.
They have found themselves in a relentless struggle to patch vulnerabilities.
They had to stay one step ahead of the ever-evolving threat landscape.

But the ransomware groups were not content with a single year’s worth of
ammunition. As 2022 dawned, armed with 45 new CVEs, they struck with increased
sophistication and precision. Their tactics had evolved. They are honed by
experience and a deep understanding of their targets. No system was safe, and no
organization was impervious to their malevolent intent. The defenders were
stretched to their limits. They scrambled to fortify their defenses and stem the
tide of ransomware attacks.

Now, as we stand on the precipice of 2023, the battle against ransomware groups
continues. Though the number of CVEs at their disposal has only risen by 12, the
impact of their attacks remains potent. The defenders know all too well that the
ransomware groups are stubborn. They are utilizing the vulnerabilities from
previous years continuously. The lessons learned from the torrential storms of
2021 and 2022 remain etched in their collective memory. It reminds defenders of
the importance of constant vigilance and robust cybersecurity measures.

Vulnerabilities Associated with Ransomware Groups by Vendor

Microsoft held a commanding 35.4% share of the vulnerabilities exploited by
ransomware groups because of its ubiquitous presence and a range of products
relied upon by countless organizations. Microsoft’s prominence in the corporate
landscape made it an enticing target for these digital criminals. Their
products, such as Windows and Exchange Server, form the backbone of countless
businesses. They house invaluable data and communications.

However, other vendors also garnered the attention of the ransomware
underworld. Apache, OpenSSL, VMware, Fortinet, Apple, and Google garnered the
attention of these malicious actors. It offered them additional avenues to
infiltrate systems and wreak havoc. Each of these vendors plays a relevant role
in the corporate ecosystem.

CVSSv3 Scores vs SVRS Scores

Traditional scoring systems like CVSSv3 have long been relied upon to assess the
criticality of vulnerabilities. Looking at the data, we can see that there were
47 Critical CVEs, 68 High CVEs, and 13 Medium CVEs identified. CVSSv3 scores
provide valuable information in determining the urgency of a vulnerability.
However, they may not capture the full context and depth of the threat
landscape. This is where the SOCRadar Vulnerability Risk Score (SVRS) steps in
to offer a more comprehensive understanding. The SVRS takes into account a range
of qualitative elements. It ranges from social media, news, code repositories,
and dark/deep web sources to the attribution of threat actors and malware.

Digging into the SVRS scores, we find that there are 12 CVEs with SVRS scores
ranging from 90 to 100, indicating a critical level of risk and severity.
Additionally, 17 CVEs fall within the SVRS range of 80 to 89, and 29 CVEs are
within the range of 70 to 79. It’s worth noting that 44 CVEs have SVRS scores
between 40 and 69, signifying a moderate level of risk as of now.

These numbers highlight the value of SVRS in providing a more nuanced
understanding of vulnerabilities. By incorporating qualitative elements, SVRS
paints a richer picture of the potential impact and urgency of a vulnerability.
It enables organizations to make more informed decisions regarding their
security measures.

Vulnerability Types of CVEs

Examining the data on vulnerability types leveraged by ransomware groups, we
discover a landscape dominated by one particularly menacing
vulnerability: Remote Code Execution (RCE).

With a staggering 40.6% share, RCE vulnerabilities stand as the favored weapon
in the arsenal of these malicious actors. This vulnerability type allows
attackers to execute arbitrary code on targeted systems. Its magnitude cannot be
underestimated. The consequences of successful RCE exploitation can be
devastating.

However, RCE is not the sole vulnerability type embraced by ransomware
groups. Privilege Escalation comes in second at 18%. It enables attackers to
elevate their access privileges within a system and move laterally. In return,
compromising additional resources. Bypass vulnerabilities account for 12.5%. It
provides cybercriminals with methods to evade or circumvent security controls,
while Denial of Service vulnerabilities stands at 9.4%. It allows attackers to
disrupt or disable critical services, causing operational chaos.

Further down the list, we find Overflow vulnerabilities at 5.5%, Directory
Traversal, and Memory Corruption, both at 3.9% each. It highlights the diverse
techniques employed by ransomware groups. 

Amidst this landscape, it is clear that RCE vulnerabilities reign supreme. It is
the gateway for ransomware attacks. Their ability to execute arbitrary code
grants cybercriminals unrestricted access to systems. It allows them to deploy
ransomware, encrypt valuable data, and hold it hostage for monetary gain.

Top Ransomware Groups

Two names stand out among the top ransomware groups since the beginning of
2021: LockBit and Conti. Let’s delve into their exploits and the impact they
have had since 2021.

Lockbit, represented by its two versions, LockBit 3.0 and LockBit2.0, has been a
formidable force. They launched, with their two versions, a staggering 892 and
869 attacks, respectively. With their sophisticated techniques and advanced
encryption algorithms, LockBit has become synonymous with high-profile breaches,
targeting organizations across industries.

Another notorious group, Conti, has etched its name in infamy with 574
documented attacks. However, a significant development unfolded in 2022,
as Conti collapsed due to an implosion. Still, their impact continues to
reverberate within the cybersecurity community. There are new groups formed from
the remains of Conti.

Alongside these prominent groups, others have left their mark on the ransomware
landscape. AlphV/BlackCat has carried out 440 attacks, while Black Basta has
inflicted its own brand of digital mayhem with 228 incidents. Hive, Royal,
and Vice Society round out the list, each leaving a trail of ransomware attacks
in their wake.

However, one group skyrocketed in 2023, the Cl0p Ransomware. They leveraged
zero-day vulnerabilities in MOVEit and GoAnywhere MFT software and launched
torrents of attacks on big targets. As you can see on the graphic below, they
currently sit in third place for the year 2023.

Top Ransomware Groups for the first half of 2023

Top groups did not see a huge change in the first half of 2023. LockBit still
stays way above any other group. In addition to the rise of Cl0p’s terror, we
can see another group, Medusa Team, etching itself as one of the top threats.

These numbers paint a grim picture of the pervasive threat posed by ransomware
groups. The sheer volume of attacks signifies the scale of their operations.


TOP 10 VULNERABILITIES LEVERAGED BY RANSOMWARE GROUPS


PROXYSHELL VULNERABILITIES

In August 2021, the cybersecurity community was alerted to the emergence
of ProxyShell. It is a dangerous chain of vulnerabilities targeting
on-premises Microsoft Exchange Servers. ProxyShell is comprised of three
critical vulnerabilities: CVE-2021-34473, CVE-2021-34523, and CVE-2021-31207.
These vulnerabilities affect versions of Exchange Server 2013, Exchange Server
2016, and Exchange Server 2019. Exploiting these vulnerabilities, ransomware
groups can achieve pre-authenticated remote code execution (RCE), gaining
unauthorized access and disrupting organizations’ digital infrastructures. Since
then, sectors such as Education, Government, Business Services, and
Telecommunications have already fallen victim to ransomware attacks leveraging
ProxyShell vulnerabilities.

The ProxyShell exploit chain begins with the creation of an email item within a
mailbox. It leverages the Autodiscover service and the Messaging Application
Programming Interface (MAPI). These techniques allow attackers to obtain the
necessary credentials and access tokens to interact with Exchange Web Services
(EWS) as legitimate users.

CVE-2021-34473, the first vulnerability in the ProxyShell chain,
involves pre-auth path confusion. It enables attackers to bypass access control
lists (ACL) and gain arbitrary access to backend URLs as NT AUTHORITY/SYSTEM.
This initial breach sets the stage for the subsequent vulnerabilities to be
exploited.

CVE-2021-34523, the second vulnerability, exploits the Exchange PowerShell
backend. By downgrading from the NT AUTHORITY/SYSTEM account to the target user,
who must possess local administrative privileges, attackers can execute
arbitrary Exchange PowerShell commands.

CVE-2021-31207, the final vulnerability in the ProxyShell chain, allows
attackers to write files, specifically web shells, through
the New-MailboxExportRequest cmdlet. These web shells, encoded in emails, are
exported to a specific path, where they become decoded and operational. It
potentially provides attackers with complete control over the compromised
system.

ProxyShell vulnerability chain (Source: Keysight)

The LV Ransomware group has been found leveraging the ProxyShell vulnerability
chain. The emergence of LV Ransomware’s usage of ProxyShell underscores the
evolving tactics and capabilities of ransomware groups. It highlights the
critical importance of proactive vulnerability management against such threats.


PROXYLOGON VULNERABILITIES

The ProxyLogon vulnerabilities have garnered significant attention due to their
impact on Microsoft Exchange Server. These vulnerabilities, which
include CVE-2021-26855, CVE-2021-26857, CVE-2021-26858, and CVE-2021-27065,
allowed threat actors to exploit weaknesses in the Exchange Server’s
authentication and remote code execution mechanisms.

CVE-2021-26855 represents a server-side request forgery (SSRF)
vulnerability that enabled unauthenticated attackers to send arbitrary HTTP
requests and authenticate as the Exchange Server. This allowed them to gain
unauthorized access and potentially exfiltrate sensitive information.

CVE-2021-26857 involved an insecure deserialization vulnerability, enabling
remote code execution. By sending a specially crafted request, attackers could
execute arbitrary code in the context of the Exchange Server, compromising the
entire system.

CVE-2021-26858 represented a post-authentication arbitrary file write
vulnerability. Exploiting this flaw allowed attackers with limited access to
write arbitrary files. In return, it could be leveraged for further exploitation
or to maintain persistence within the compromised environment.

CVE-2021-27065, the final vulnerability, pertained to a post-authentication
arbitrary file written in the Exchange Control Panel (ECP). Attackers could
utilize this vulnerability to write files and execute arbitrary code on the
server.

The ProxyLogon vulnerabilities collectively provided a pathway for threat actors
to gain unauthorized access, execute arbitrary code, and perform malicious
activities within Exchange Server environments. The exploitation of these
vulnerabilities enabled attackers to carry out the deployment of ransomware in
addition to other types of attacks.

ProxyLogon vulnerability chain (Source: Microsoft)

DoejoCrypt was observed exploiting the ProxyLogon vulnerabilities to gain
initial access to vulnerable Exchange Servers. Once inside the compromised
network, they deployed their ransomware payload, encrypting files across
affected systems and demanding a ransom for their decryption. The use of
ProxyLogon vulnerabilities provided DoejoCrypt with a way to bypass
authentication mechanisms and establish a foothold within the targeted
organization’s infrastructure.

Similarly, Pydomer capitalized on the ProxyLogon vulnerabilities to infiltrate
vulnerable Exchange Servers. By exploiting the weaknesses, Pydomer gained
unauthorized access and proceeded to deploy its ransomware, encrypting files and
paralyzing critical systems. Pydomer then demanded a ransom from the victimized
organizations in exchange for the decryption keys needed to restore the
encrypted files.


LOG4SHELL

Log4Shell is a significant vulnerability that emerged in December 2021. It
caused a major impact on the cybersecurity landscape. It is a zero-day
vulnerability discovered in the Apache Log4j logging library, widely used by
Java applications. The vulnerability is identified as CVE-2021-44228 and carries
a critical CVSS score of 10.0.

The Log4Shell vulnerability allows attackers to execute arbitrary code on
targeted systems. It potentially leads to system compromise and unauthorized
access to sensitive information. Given the extensive adoption of the Apache
Log4j library, the severity of this vulnerability is heightened. Many
organizations, including tech giants like Apple, Google, Amazon, and Tesla,
utilize this library in their environments.

Research conducted after the disclosure of the vulnerability revealed that Log4j
was one of the most downloaded libraries, indicating its prevalence. Numerous
projects were identified as vulnerable, with over 100 million instances of
software and technology affected. In a pool of 105,497 services assessed for the
Log4Shell vulnerability, a staggering 102,060 were found to be vulnerable.

Despite the high potential for exploitation, the public impact of Log4Shell has
been somewhat less catastrophic than initially anticipated. However, it remains
actively exploited by threat actors. The severity of the vulnerability led
the Cyber Safety Review Board (CSRB) to classify it as an “endemic
vulnerability.” It means that it is expected to persist in systems for many
years, presenting a significant long-term risk.

Log4Shell exploitation diagram (Source: Splunk)

Multiple ransomware groups have leveraged the Log4Shell vulnerability to carry
out attacks. LockBit, Conti (disbanded), and Alphv/BlackCat were responsible for
the majority of Log4Shell incident response cases, with the average cost of a
Log4Shell compromise exceeding $90,000.


PRINTNIGHTMARE

The PrintNightmare vulnerability refers to a critical security flaw discovered
in the Windows Print Spooler service, which is responsible for managing print
jobs on Windows operating systems. This vulnerability was disclosed in June 2021
and is tracked as CVE-2021-34527.

The PrintNightmare vulnerability allows an attacker to remotely execute
arbitrary code with system-level privileges on a target system. This means that
an attacker who successfully exploits the vulnerability can take control of the
affected system. After that, install programs, view, change, or delete data, and
create new user accounts with full administrative rights.

The vulnerability gained significant attention because of its severity and the
potential for widespread impact. It affects multiple versions of the Windows
operating system, including Windows 7, Windows Server 2008 R2, Windows 8.1,
Windows Server 2012, Windows 10, and Windows Server versions 2016, 2019, and
2022.

Black Basta, a ransomware group known for its malicious activities, has expanded
its arsenal by leveraging the PrintNightmare vulnerability. According to
research conducted by Trend Micro, the operators of Black Basta have
incorporated the PrintNightmare vulnerability into their attack techniques. By
exploiting this vulnerability, Black Basta is able to spread laterally across
networks and encrypt critical files, demanding ransom payments for the encrypted
data.


ZEROLOGON

ZeroLogon is a critical vulnerability that affects the Windows Netlogon Remote
Protocol (MS-NRPC) used by Microsoft Active Directory (AD). It was assigned the
identifier CVE-2020-1472. This vulnerability allows an attacker to gain
unauthorized access to the domain controller. Subsequently, take control of the
entire Windows domain network. By exploiting ZeroLogon, an attacker can
impersonate a domain controller, bypassing authentication measures and gaining
administrative privileges.

This vulnerability is particularly significant because it allows attackers to
achieve domain administrator access without requiring any user credentials. It
makes it highly dangerous and appealing to malicious actors. With full control
over the domain controller, an attacker can exploit the compromised network,
steal sensitive information, deploy ransomware, or carry out other malicious
activities.

ZeroLogon Exploit Diagram (Source: TrendMicro)

BianLian Ransomware is a threat actor group that has been identified as
potentially exploiting the ZeroLogon vulnerability. According to a joint
cybersecurity advisory by U.S. and Australian agencies, the group has
demonstrated the capability to exploit this critical vulnerability in their
ransomware operations. By leveraging ZeroLogon, BianLian Ransomware can gain
unauthorized access to Windows domains, compromising the network infrastructure
and potentially deploying ransomware to encrypt valuable data.


ON THE RISE VULNERABILITIES


MOVEIT TRANSFER VULNERABILITY (CVE-2023-34362)

MOVEit Vulnerability (CVE-2023-34362) page on SOCRadar Vulnerability
Intelligence

Cybercriminals are currently targeting the MOVEit Transfer software by
exploiting a critical zero-day vulnerability known as CVE-2023-34362. This
vulnerability allows attackers to execute remote code and extract data from
organizations by leveraging SQL injection (SQLi) techniques. MOVEit Transfer is
a managed file transfer (MFT) software developed by Ipswitch, a subsidiary of
Progress Software Corporation.

On May 31, 2023, Progress Software issued an advisory to inform their customers
about this critical vulnerability in MOVEit Transfer. Shortly after, on June 2,
the vulnerability was assigned the CVE identifier CVE-2023-34362.

According to researchers, there have been observations of Cl0p Ransomware group
actively seeking partners to collaborate on SQL injection attacks. And it bore
fruit in the recent news CL0P announced a huge number of victims of their
ransomware attacks.

To keep updated on the subject, you can check this blog post by SOCRadar.


FORTRA GOANYWHERE MFT VULNERABILITY (CVE-2023-0669)

Fortra GoAnywhere MFT vulnerability, identified as CVE-2023-0669, allows an
attacker to execute arbitrary code remotely, potentially gaining unauthorized
access and control over the affected system.

The CVE-2023-0669 has led to an increase in ransomware attacks since its
disclosure. Malicious actors, including the Cl0p Ransomware group and the
BlackCat (ALPHV) ransomware group, have attempted to exploit this zero-day
remote code execution (RCE) vulnerability. In March, there were 459 recorded
attacks related to the GoAnywhere MFT vulnerability, marking a significant 91%
increase compared to the previous month. The healthcare industry has been
particularly targeted, with 129 organizations being affected. These attacks
highlight the severity and real-world impact of the CVE-2023-0669 vulnerability
in terms of facilitating ransomware campaigns.


3CX VOIP DESKTOP CLIENT (CVE-2023-29059)

The CVE-2023-29059 vulnerability is associated with a supply chain attack known
as “SmoothOperator” that targets the 3CX VoIP desktop client. This attack
involves the exploitation of a vulnerability within the 3CX VoIP desktop client
software, which allows an attacker to execute arbitrary code on the targeted
system.

The SmoothOperator attack campaign aims to compromise the software’s update
mechanism, injecting malicious code into legitimate updates. When users download
and install these compromised updates, the attacker gains unauthorized access to
their systems.

Cybercriminals may exploit CVE-2023-29059 as a means to launch ransomware
attacks on unsuspecting targets. By compromising the update mechanism of the 3CX
VoIP desktop client, attackers can inject malicious code into legitimate
software updates. Users who download and install these compromised updates may
unknowingly grant unauthorized access to their systems, providing an opportunity
for ransomware to be deployed.


CONCLUSION

And so, our journey into the realm of vulnerabilities ransomware groups use
comes to a close. We have dived deep into the dark secrets behind ransomware
attacks. We explored the top 10 vulnerabilities that these malicious groups
exploited in recent years. 

The statistics have painted an unpleasant picture of the threat landscape. We
have witnessed the criticality of the vulnerabilities that came out in 2021 and
2022. It revealed the vulnerabilities most commonly leveraged by ransomware
groups. Microsoft, with its widespread usage and products like Windows and
Exchange Server, has been a prime target. RCE vulnerabilities have emerged as
the favored weapon of these nefarious actors. The picture painted with these
statistics emphasizes the average cost of a successful ransomware attack, with
estimates ranging between $570,000 to $812,360.

We have also encountered some of the top ransomware groups, such as LockBit.
They have plundered with their sophisticated techniques and
advanced encryption algorithms. The impact of their attacks has been
substantial. It left organizations grappling with compromised data, financial
losses, and reputational damage.

But amidst the darkness, we have found a glimmer of hope. Armed with knowledge
and empowered by SOCRadar Extended Threat Intelligence platform. With it, we can
fortify our digital defenses and fight back against ransomware attacks.
SOCRadar’s advanced threat intelligence capabilities provide real-time
insights into emerging threats, vulnerabilities, and malicious activities. It
enables organizations to detect and respond to potential ransomware attacks
before they cause significant harm.

By leveraging SOCRadar’s comprehensive External Attack Surface Management
(EASM) solution, businesses can gain a holistic view of their external attack
surface. They can identify potential entry points for ransomware attacks. With
continuous monitoring and threat intelligence integration, organizations can
proactively detect vulnerabilities and prioritize their remediation efforts. In
return, they can mitigate the risk of ransomware incidents.

Moreover, SOCRadar EASM offers automated asset inventory, vulnerability
assessment, and threat intelligence integration. It simplifies risk management
processes and enhances incident response capabilities. By utilizing SOCRadar’s
comprehensive suite of security tools, organizations can significantly reduce
their exposure to ransomware threats and strengthen their overall security
posture.

SOCRadar External Attack Surface Management

As we bid farewell to this epic adventure, let us remember that the battle
against ransomware is ongoing. The threat landscape is constantly evolving. New
vulnerabilities and techniques will continue to emerge. But with constant
vigilance, proactive security measures, and trusted allies like SOCRadar
Extended Threat Intelligence, we can navigate the dangers and safeguard our
digital kingdoms.

The battle against ransomware may be daunting, but we are not alone. Together,
with the knowledge and preparedness provided by SOCRadar EASM, we shall emerge
victorious. We will be fortified against ransomware attacks and resilient in the
face of evolving cyber threats. The time to fortify our defenses and protect
what is ours is now. The battle against ransomware continues, and with SOCRadar
EASM as our shield, we shall prevail.







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