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Malware
THREAT ACTORS TARGET THE MIDDLE EAST USING FAKE PALO ALTO GLOBALPROTECT TOOL
Threat actors are targeting users in the Middle East by distributing
sophisticated malware disguised as the Palo Alto GlobalProtect tool.
By: Mohamed Fahmy August 29, 2024 Read time: 5 min (1380 words)
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--------------------------------------------------------------------------------
SUMMARY AND INTRODUCTION
* Users in the Middle East are potentially being targeted by threat actors
through malware disguised as the Palo Alto GlobalProtect Tool.
* The malware uses a two-stage infection routine and advanced C&C
infrastructure.
* It infects victims via a setup.exe file while using the Interactsh project
for beaconing, communicating with specific hostnames to report infection
progress and gather victim information.
* The malware can execute remote PowerShell commands, download and exfiltrate
files, encrypt communications, and bypass sandbox solutions, representing a
significant threat to targeted organizations.
We came across a sophisticated malware sample employing a two-stage infection
process and seemingly originating from the Middle East, that masquerades as a
legitimate Palo Alto GlobalProtect tool.
One of the more notable aspects of this malware is its use of a
command-and-control (C&C) infrastructure that pivots to a newly registered URL
("sharjahconnect"; note that Sharjah is one of the emirates of the UAE) designed
to resemble a company VPN portal. This disguise not only aids in the initial
infiltration but also helps maintain persistent access to compromised networks.
Furthermore, the malware uses the Interactsh project (a tool primarily designed
for penetration testers to verify the success of their exploits) for beaconing
purposes. Using this tool, threat actors can trigger connections to hostnames
within Interactsh’s oast[.]fun domain. Note that other threat actors such as
APT28 have been observed exploiting this resource. In this case, the threat
actor behind the malware used these connections as a beaconing mechanism to
track which targets progress through various stages of the infection chain.
Written in C#, this malware boasts a range of capabilities, including the
ability to execute remote PowerShell commands, download and execute additional
payloads, and exfiltrate specific files from the infected machine. These
functions highlight the malware's potential to cause significant damage and
disruption within targeted organizations.
As we examine the technical specifics and the broader implications of this
threat, it is important for cybersecurity professionals to stay informed and
vigilant. Understanding the nuances of such sophisticated attacks is essential
for developing effective defense mechanisms and mitigating potential risks to
critical infrastructure and sensitive data.
INFECTION CHAIN
The exact delivery method of this malware remains unclear, but it is suspected
to have been part of a phishing attack that deceives victims into believing they
are installing a legitimate GlobalProtect agent.
Figure 1. Infection chain of an attack
download
The infection chain begins with a file named setup.exe, which is the initial
stage of the attack. This executable deploys GlobalProtect.exe, which is the
primary component of the malware, along with the configuration files RTime.conf
and ApProcessId.conf. These files are then placed in the directory
C:\\Users\(UserName)\AppData\Local\Programs\PaloAlto\.
Figure 2. Fake GlobalProtect setup process
download
Once executed, GlobalProtect.exe initiates a beaconing mechanism to notify the
threat actor of the successful completion of each phase of the infection
process. It communicates with hostnames such as
step[1-6]-[dsktoProcessId].tdyfbwxngpmixjiqtjjote3k9qwc31dsx.oast[.]fun to
report the routine’s progress, specifically during “step1-6” of the infection
chain.
BEHAVIOR AND COMMANDS
SANDBOX EVASION TECHNIQUE
The malware implements an evasion technique to bypass behavior analysis and
sandbox solutions by checking the process file path and the specific file before
executing the main code block.
Figure 3. Code snippet showing the malware evasion technique
download
RETRIEVING MACHINE INFORMATION
The malware retrieves the victim’s IP address, operating system information,
username, machine name, and sleep time sequence from the RTime.conf file. It
also gathers the DesktoProcessId and encryption key from ApProcessId.conf. The
key is used to encrypt the traffic sent to the C&C server , while the
DesktoProcessId is used to identify specific parts of the URL for beaconing.
Figure 4. Gathering information from the victim’s machine
download
MALWARE ENCRYPTION
Our analysis revealed that the malware uses string encryption via the AES
encryption algorithm. The following is an explanation of each part of the
encryption method:
* Input: Takes two strings, one to encrypt and another as the key.
* Process: Encrypts the input string using AES encryption with ECB mode.
* Output: Returns the encrypted string in Base64 format. If the encryption
fails, it returns the original string.
Figure 5. The malware encryption process
download
MALWARE COMMANDS
The malware uses four types of commands, which are explained in the following
table:
Command Details time to reset Commands the malware to sleep for a specific
amount of time. pw Execute a PowerShell script and return the result to the
server hxxp[:]//94.131.108.78[:]7118/B/hi/, after which the threat actor is
notified via DNS request if “step6” is successful. pr Processes a command string
and performs different actions based on the command type:
wtime: Reads or writes a wait time to a file.
create-process: Starts a process and returns its output.
dnld: Downloads a file from a URL to a local path.
upl: Uploads a file to a remote server.
Encryption is used for secure communication with the remote server. If the
command is unrecognized, it returns an "invalid program command" message. The
result is sent to the C&C server hxxp[:]//94.131.108.78[:]7118/B/hi/. invalid
command type In case an error occurs in any part of the execution, the malware
uses the command function to send the result via the string “invalid command
type”.
Table 1. The commands used by the malware
Figure 6. Code snippet showing the malware commands
download
USING THE INTERACTSH PROJECT FOR BEACONING PURPOSES
The malware leverages the Interactsh project for beaconing purposes. After each
phase of the malware infection, it sends a DNS request to the following domain:
Step[1-6]-{dsktoProcessId}.tdyfbwxngpmixjiqtjjote3k9qwc31dsx.oast.fun
Here, dsktoProcessId is a unique identifier for the machine, while Step[1-6]
varies from step 1 to step 6, corresponding to each phase of the malware's
operation, ranging from collecting machine information to successfully executing
commands received from the C&C server.
CONCLUSION
The malware sample we examined, which likely targets entities within the Middle
East, reveals a sophisticated use of C&C infrastructure and advanced evasion
techniques.
Our findings include the following:
1. Using dynamic C&C infrastructure: The malware pivots to a newly registered
URL, "sharjahconnect" (likely referring to the UAE emirate Sharjah),
designed to resemble a legitimate VPN portal for a company based in the UAE.
This tactic is designed to allow the malware’s malicious activities to blend
in with expected regional network traffic and enhance its evasion
characteristics.
2. Domain masquerading: By mimicking a familiar regional service, the attackers
exploit trust relationships, increasing the likelihood of successful C&C
communications.
3. Geopolitical targeting: The domain's regional specificity and the origin of
the submission suggest a targeted campaign against Middle Eastern entities,
possibly for geopolitical or economic espionage.
4. Using newly registered domains: Using fresh domains for C&C activities
allows attackers to bypass blacklists and makes attribution more
complicated.
RECOMMENDATIONS AND TREND SOLUTIONS
It’s likely that the threat actor made use of social engineering to lure victims
into downloading fake tools and services. Given the widespread use of social
engineering in cybercrime, defending against it should be a priority for both
organizations and individual users. This requires a multi-faceted approach that
combines education, policy, technology, and vigilance. Here are some
recommendations to help safeguard against social engineering:
User awareness and training: Conducting regular training sessions on the various
types of social engineering attacks, providing updates on new tactics and trends
in social engineering, and educating employees to recognize common red flags can
help prevent users from falling victim to social engineering lures.
Principle of least privilege: Granting employees access only to the data and
systems they need for their roles minimizes the chance of attackers gaining
access to vital information even during a successful breach.
Email and web security: Organizations should deploy robust email and web
security solutions to filter and block malicious and suspicious content.
Incident response plan: A well-defined incident response plan is crucial for
organizations to be able to handle social engineering attacks. This includes the
immediate steps to contain and mitigate the threat.
Organizations can also consider powerful security technologies such as Trend
Vision One™ , which offers multilayered protection and behavior detection,
helping block malicious tools and services before they can inflict damage on
user machines and systems.
VISION ONE QUERY
The following V1 Detection quary can be used to check the presence of the
GLOBALSHADOW binary:
malName:* GLOBALSHADOW* AND eventName:MALWARE_DETECTION
Indicators of Compromise (IOCs)The indicators of compromise for this entry can
be found here.
Tags
Malware | APT & Targeted Attacks | Endpoints | Research | Articles, News,
Reports | Cyber Threats
AUTHORS
* Mohamed Fahmy
Threat Researcher
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