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BLACKSUIT


Akira


BLACKSUIT RANSOMWARE: IN-DEPTH ANALYSIS, DETECTION, AND MITIGATION


WHAT IS BLACKSUIT RANSOMWARE?

The BlackSuit ransomware operation emerged in early April/May of 2023. The group
is a multi-pronged extortion outfit, encrypting and exfiltrating victim data and
hosting public data leak sites for those victims that fail to comply with their
demands. The group is known for significant attacks against entities in the
healthcare and education sectors, along with other critical industries.
BlackSuit is a private operation in that there are no public affiliates.
BlackSuit payloads contain many technical similarities to Royal ransomware
payloads such as similar encryption mechanisms and command-line parameters.








WHAT BLACKSUIT RANSOMWARE TARGET?

BlackSuit is a private ransomware/extortion operation. Large enterprises and
small to medium-sized businesses (SMBs) are targeted, though there does not
appear to be any specific discrimination when it comes to industry or type of
target. Similar to Royal, targeting of entities in the CIS (Commonwealth of
Independent States) appears to be excluded. To date, BlackSuit targeting has
favored those in the healthcare, education, information technology (IT),
government, retail, and manufacturing industries.








HOW DOES BLACKSUIT RANSOMWARE WORK?

The group emerged with payloads that support both Windows and Linux operating
systems. Payloads are delivered via phishing email or third party framework
(e.g., Empire, Metasploit, Cobalt Strike). The use of malicious torrent files
has also been observed as a delivery vector for BlackSuit ransomware.

Command line parameters supported by BlackSuit ransomware:

-p {target path} Target path -killvm Termination of vmware via esxcali command
syntax -allfiles Encrypt all files -network Encrypt connected and available
network volumes -local Encrypt local volumes only (no network spreading)
-percent Encrypt percentage (incremental file encryption option for performance)
-demonoff Display logs -list {file} Supply test file list of inclusions for
encryption -delete Toggle self-deletion feature -thrcount and performance
Specify specific thread count, assist when discerning between x86 or x64
targeting -skip {file} Supply text file of paths to exclude from encryption
-noprotect No PID check, can allow multiple instances of the encryptor to run

 

BlackSuit payloads, on both Windows and Linux, utilize OpenSSL’s implementation
of AES for data encryption, which supports the intermittent encryption options
(-percent option). Linux payloads have the ability to target and manipulate
VMWare ESXi servers, via the -killvm option, for example. This parameter is tied
to the esxcli process:







Observed esxcli commands include:

"esxcli vm process list > list_"

"esxcli vm process kill --type=soft --world-id=%s"

"esxcli vm process kill --type=soft --world-id=%s"

"esxcli vm process list > PID_list_"

 

BlackSuit encryption is extremely rapid. Local logical drive details are
obtained upon launch at which time the ransomware will very quickly process
through available files and folders on all reachable volumes.

On Windows systems, the ransomware will attempt to inhibit system recovery by
removing Volume Shadow Copies (VSS). This is handled via a hidden shell command
which launches VSSADMIN.EXE with the /ALL and /Quiet options.













BlackSuit ransom notes are written to all folders which contain encrypted items.
The ransom notes are written as “README.BlackSuit.txt”.







This is only slightly varied on the Linux variants of BlackSuit. The ransom
notes on Linux instances will be written to targeted folders as
“README.blacksuit.txt”, noting the change in capitalization.








HOW TO DETECT BLACKSUIT RANSOMWARE

The SentinelOne Singularity XDR Platform can identify and stop any malicious
activities and items related to BlackSuit ransomware.







In case you do not have SentinelOne deployed, detecting BlackSuit ransomware
requires a combination of technical and operational measures designed to
identify and flag suspicious activity on the network. This allows the
organization to take appropriate action, and to prevent or mitigate the impact
of the ransomware attack.

To detect BlackSuit ransomware without SentinelOne deployed, it is important to
take a multi-layered approach, which includes the following steps:

 1. Use anti-malware software or other security tools capable of detecting and
    blocking known ransomware variants. These tools may use signatures,
    heuristics, or machine learning algorithms, to identify and block suspicious
    files or activities.
 2. Monitor network traffic and look for indicators of compromise, such as
    unusual network traffic patterns or communication with known
    command-and-control servers.
 3. Conduct regular security audits and assessments to identify network and
    system vulnerabilities and ensure that all security controls are in place
    and functioning properly.
 4. Educate and train employees on cybersecurity best practices, including
    identifying and reporting suspicious emails or other threats.
 5. Implement a robust backup and recovery plan to ensure that the organization
    has a copy of its data and can restore it in case of an attack.


HOW TO MITIGATE BLACKSUIT RANSOMWARE

The SentinelOne Singularity XDR Platform can return systems to their original
state using either the Quarantine or Repair.







In case you do not have SentinelOne deployed, there are several steps that
organizations can take to mitigate the risk of BlackSuit ransomware attacks:

Educate employees: Employees should be educated on the risks of ransomware, and
on how to identify and avoid phishing emails, malicious attachments, and other
threats. They should be encouraged to report suspicious emails or attachments,
and to avoid opening them, or clicking on links or buttons in them.

Implement strong passwords: Organizations should implement strong, unique
passwords for all user accounts, and should regularly update and rotate these
passwords. Passwords should be at least 8 characters long, and should include a
combination of uppercase and lowercase letters, numbers, and special characters.

Enable multi-factor authentication: Organizations should enable multi-factor
authentication (MFA) for all user accounts, to provide an additional layer of
security. This can be done through the use of mobile apps, such as Google
Authenticator or Microsoft Authenticator, or through the use of physical tokens
or smart cards.

Update and patch systems: Organizations should regularly update and patch their
systems, to fix any known vulnerabilities, and to prevent attackers from
exploiting them. This includes updating the operating system, applications, and
firmware on all devices, as well as disabling any unnecessary or unused services
or protocols.

Implement backup and disaster recovery: Organizations should implement regular
backup and disaster recovery (BDR) processes, to ensure that they can recover
from ransomware attacks, or other disasters. This includes creating regular
backups of all data and systems, and storing these backups in a secure, offsite
location. The backups should be tested regularly, to ensure that they are
working, and that they can be restored quickly and easily.

BlackSuit Ransomware: In-Depth Analysis, Detection, and Mitigation
 * BlackSuit Ransomware: In-Depth Analysis, Detection, and Mitigation
 * What Is BlackSuit Ransomware?
 * What BlackSuit Ransomware Target?
 * How Does BlackSuit Ransomware Work?
 * How to Detect BlackSuit Ransomware
 * How to Mitigate BlackSuit Ransomware


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