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Ransomware


KASSEIKA RANSOMWARE DEPLOYS BYOVD ATTACKS, ABUSES PSEXEC AND EXPLOITS MARTINI
DRIVER 

In this blog, we detail our investigation of the Kasseika ransomware and the
indicators we found suggesting that the actors behind it have acquired access to
the source code of the notorious BlackMatter ransomware.  

By: Emmanuel Panopio, Christian Jason Geollegue, Julius Keith Estrellado,
Christian Alpuerto, Shawn Austin Santos, Emmanuel Roll, Rhio Manaog, Gerald
Fernandez, Don Ovid Ladores, Raighen Sanchez, Raymart Yambot, Francesca
Villasanta, Sophia Nilette Robles January 23, 2024 Read time: 6 min (1695 words)

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--------------------------------------------------------------------------------

Following an increase in bring-your-own-vulnerable-driver (BYOVD) attacks
launched by ransomware groups in 2023, the Kasseika ransomware is among the
latest groups to take part in the trend. Kasseika joins Akira, BlackByte, and
AvosLocker in using the tactic that allows threat actors to terminate antivirus
processes and services for the deployment of ransomware. In this case we
investigated, the Kasseika ransomware abused Martini driver to terminate the
victim machine’s antivirus-related processes.  

In our analysis of the Kasseika ransomware attack chain, we observed indicators
that resemble the BlackMatter ransomware. These indicators include pseudo-ransom
extensions and the use of extension string.README.txt as the ransom note file
name and format.  

A closer look revealed that majority of the source code used by BlackMatter was
used in this attack. Based on our research, the BlackMatter source code is not
widely available, so its use in this Kasseika ransomware attack is suggestive of
a mature actor in a limited group that acquired or bought access to it. 

BlackMatter respawned from DarkSide, which is known to have been used as the
basis for ALPHV, more popularly known as BlackCat. Since its shutdown in 2021,
other ransomware groups have been observed using similar techniques and tools to
BlackMatter, while a more exclusive group of ransomware operators are able to
access its old code and apply it to new strains.   

Figure 1. The Kasseika ransomware infection chain
download

Targeted phishing links via email for initial access 

In the Kasseika ransomware case that we investigated, we observed that it used
targeted phishing techniques for initial access, as well as to gather
credentials from one of the employees of its target company. It then uses remote
administration tools (RATs) to gain privileged access and move laterally within
its target network. 

Figure 2. PsExec Command to execute malicious .bat file (click to enlarge)

Abusing PsExec for execution 

Kasseika abused the legitimate Windows RAT PsExec to execute its malicious
files. PsExec was originally designed for network management, but its misuse
allows threat actors to remotely deploy a malicious .bat file, as in this
case.  

Figure 3. Kasseika terminates Martini runtime

The Kasseika ransomware initially uses a batch script to load its malicious
entities. The script begins by checking for the existence of the process named
Martini.exe. If found, it then proceeds to terminate it to ensure that there is
only one instance of the process running on the machine.  

Kasseika’s KILLAV mechanism for defense evasion 

Upon further analysis, Martini.exe first verifies whether the Martini.sys driver
was successfully downloaded to the affected system. The signed driver
Martini.sys, originally labeled as viragt64.sys, is part of VirIT Agent System
developed by TG Soft. By exploiting its vulnerabilities, Kasseika leverages this
driver to effectively disable various security tools. If Martini.sys does not
exist, the malware will terminate itself and not proceed with its intended
routine. 

Figure 4. “Martini.sys” file properties and certificate information
download

After confirming the presence of the system file, Kasseika proceeds to create a
service and then initiates it. 

Figure 5. The service created by PINCAV trojan, a 64-bit Windows PE file written
in C++

The driver Martini.sys is then loaded by Martini.exe using the CreateFileW
function. 

Figure 6. The “Martini.sys” driver loaded by “Martini.exe”

After loading Martini.sys, Martini.exe continuously scans all active processes
in the system. Upon detecting a listed process, it conveys this information to
the driver through the DeviceIoControl function. 

Figure 7. The “DeviceIoControl” function

The control code 0x82730030 is sent to the driver, instructing it to terminate
at least 991 processes within its list, including antivirus products, security
tools, analysis tools, and system utility tools. A complete list of the
terminated processes can be found here. 

Figure 8. The “Martini.sys” case function
Figure 9. ZwTerminateProcess at “0x82730030” memory address is responsible for
process termination.

Kasseika also makes use of the FindWindowA API to compare strings. 

Figure 10. Kasseika comparing application window names for defense evasion
(click to enlarge)
download
Figure 11. Kasseika comparing strings for defense evasion

The Kasseika ransomware discovers applications that are related to process
monitoring, system monitoring, and analysis tools.  

OLLYDBG
18467-41 GBDYLLO FilemonClass pediy06 File Monitor –
Sysinternals: www.sysinternals.com RegmonClass PROCMON_WINDOW_CLASS Registry
Monitor – Sysinternals: www.sysinternals.com Process Monitor –
Sysinternals: www.sysinternals.com

Table 1. A list of process monitoring, system monitoring, and analysis tools
that Kasseika looks for

The Kasseika ransomware levels up its defense evasion techniques by discovering
running processes that are related to security and analysis tools. It will
terminate itself if these processes are present in the system. 

ntice.sys CisUtMonitor iceext.sys FileMonitor.sys Syser.sys REGMON HanOlly.sys
Regsys extrem.sys Sysregm FRDTSC.SYS PROCMON fengyue.sys Revoflt  Kernel
Detective Filem

Table 2. A list of process names related to security and analysis

Figure 12 shows that the script will remove any directories under the malicious
batch script to ensure a clean state. Kasseika will set up the variables to
store various paths and executable file names. These variables enable the script
to be more flexible, allowing easy modification of file paths and names for
future use.  

Figure 12. Initialization of variables
Figure 13. Execution of payloads

Kasseika then transfers files from a network share to a local directory. The
utilization of the /E switch ensures the comprehensive copying of all
subdirectories, including empty ones. Following this, Martini.exe is executed to
terminate any processes associated with antivirus vendors. Subsequently, the
execution proceeds to launch smartscreen_protected.exe, which we identified as
the Kasseika ransomware binary. Finally, clear.bat is executed to erase any
traces of the operation on the machine.

Figure 14. The contents of “clear.bat” for final cleanup

Kasseika payload analysis 

The Kasseika ransomware is a 32-bit Windows PE file packed by Themida.
Themida-packed binaries are known to have formidable code obfuscation and
anti-debugging techniques, making it hard to reverse-engineer them. 

Figure 15. Kasseika ransomware packed with Themida

Before encryption, Kasseika terminates all processes and services that are
currently accessing Windows Restart Manager. Kasseika first starts a new
session, modifying the Owner value from the registry keys in the following list.
It then starts enumerating session hashes (SessionHash) of processes and
services from the registry keys in the same list. After termination, it
retrieves the paths of the terminated files that will be checked later for
encryption:  

 *  HKEY_CURRENT_USER\Software\Microsoft\RestartManager\Session{numbers}
 * Owner = {hex values} 
 *  
 * HKEY_CURRENT_USER\Software\Microsoft\RestartManager\Session{numbers}
 * SessionHash = {hex values} 
 *  
 * HKEY_CURRENT_USER\Software\Microsoft\RestartManager\Session{numbers}
 * Sequence = 0x01 
 *  
 * HKEY_CURRENT_USER\Software\Microsoft\RestartManager\Session{numbers}
 * RegFiles{numbers} = {encrypted path and file} 
 *  
 * HKEY_CURRENT_USER\Software\Microsoft\RestartManager\Session{numbers}
 * RegFilesHash = {hex values} 

The Kasseika ransomware deletes the shadow copies of the affected system by
using Windows Management Instrumentation command-line (WMIC) queries to
enumerate them. 

 * SELECT * Win32_ShadowCopies 

The Kasseika ransomware then decrypts its encrypted extension by first
retrieving a hard-coded string from CryptoPP::StringSinkTemplate. Next, it uses
Base64 to encode the first nine characters of the string. Finally, since the
characters “+”, “/”, and “=” in Base64 are not compatible in a file extension,
the ransomware replaces them with “a”, “l”, and “e”, respectively.  

Figure 16. The Kasseika ransomware decrypting its file extension

Kasseika retrieves its encryption algorithm key, ChaCha20, together with the RSA
encryption algorithm from open-source C++ library CryptoPP. Kasseika then
generates a modified version of the ChaCha20 matrix that consists of randomly
generated bytes. The matrix is copied to a buffer that will be encrypted by the
RSA public key, after which the encrypted buffer is written into the modified
version of the ChaCha20 matrix. The Kasseika ransomware then uses the modified
ChaCha20 matrix to encrypt target files.    

Figure 17. The function used by Kasseika to use ChaCha20 algorithm for file
encryption

After successful encryption, the Kasseika ransomware renames the encrypted files
by appending the following encrypted extension in the encrypted files: 

 * {original filename}.{original extension}. CBhwKBgQD 

Figure 18. Sample encrypted files by the Kasseika ransomware

Afterward, Kasseika reuses the encrypted file extension as the name of its
ransom note, CBhwKBgQD.README.txt, which Kasseika will drop in every directory
that it will encrypt in the affected system. 

Figure 19. A Kasseika ransom note

At the end of its encryption routine, the Kasseika ransomware changes the
wallpaper of the affected system, as shown in Figure 20. 

Figure 20. Kasseika changes the wallpaper of the infected machine with its
ransom note

Clearing traces of the attack    As Figure 21 shows, the Kasseika ransomware
also has the capability to wipe its traces by clearing the system’s event logs
through the execution of the commands.  

Figure 21. The commands that Kasseika uses to clear the event logs

The command wevutil.exe efficiently clears the Application, Security, and System
event logs on the Windows system. This technique is used to operate discreetly,
making it more challenging for security tools to identify and respond to
malicious activities. 

Security Recommendations 

The following is a list of measures that organizations can employ as best
practices to minimize the chances of falling victim to ransomware attacks such
as those launched by the Kasseika ransomware: 

 * Only grant employees administrative rights and access when necessary. 
 *  
 * Ensure that security products are updated regularly and perform period
   scans.  
 *  
 * Secure regular backups of critical data in case of any loss. 
 *  
 * Exercise good email and website safety practices — download attachments,
   select URLs, and execute programs only from trusted sources. 
 *  
 * Encourage users to alert the security team of potentially suspicious emails
   and files and use tools to block malicious emails. 
 *  
 * Conduct regular user education around the dangers and signals of social
   engineering. 

 A multilayered approach can help organizations guard possible entry points into
their system (endpoint, email, web, and network). Security solutions can detect
malicious components and suspicious behavior, which can help protect
enterprises.   

Trend Vision One™ provides multilayered protection and behavior detection, which
helps block questionable behavior and tools before ransomware can do any
damage.  

Trend Cloud One™ – Workload Security protects systems against both known and
unknown threats that exploit vulnerabilities. This protection is made possible
through techniques such as virtual patching and machine learning.   

Trend Micro™ Deep Discovery™ Email Inspector employs custom sandboxing and
advanced analysis techniques to effectively block malicious emails, including
phishing emails that can serve as entry points for ransomware.   

Trend Micro Apex One™ offers next-level automated threat detection and response
against advanced concerns such as fileless threats and ransomware, ensuring the
protection of endpoints. 

Indicators of compromise

The Kasseika ransomware indicators of compromise can be found here.

Tags
Articles, News, Reports | Ransomware | Research


AUTHORS

 * Emmanuel Panopio
   
   Threat Researcher

 * Christian Jason Geollegue
   
   Threat Response Engineer

 * Julius Keith Estrellado
   
   Cybersecurity Threat Engineer

 * Christian Alpuerto
   
   Threat Response Engineer

 * Shawn Austin Santos
   
   Threat Response Engineer

 * Emmanuel Roll
   
   Threat Response Engingeer

 * Rhio Manaog
   
   Threat Response Engineer

 * Gerald Fernandez
   
   Threat Response Engineer

 * Don Ovid Ladores
   
   Threats Analyst

 * Raighen Sanchez
   
   Threat Response Engineer

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