Malware Analysis Report

2025-06-15 20:00

Sample ID 240611-wld89swakf
Target 2024-06-11_88af66a07ddc2cdf772ce0806f196e0c_bkransomware
SHA256 877b7a3b09c2ac8be387e08e18e761a5ef77dfcf570ad8a742bb9f6b9cc5031e
Tags
persistence spyware stealer
score
7/10

Table of Contents

Analysis Overview

MITRE ATT&CK

Enterprise Matrix V15

Analysis: static1

Detonation Overview

Signatures

Analysis: behavioral1

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis: behavioral2

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis Overview

score
7/10

SHA256

877b7a3b09c2ac8be387e08e18e761a5ef77dfcf570ad8a742bb9f6b9cc5031e

Threat Level: Shows suspicious behavior

The file 2024-06-11_88af66a07ddc2cdf772ce0806f196e0c_bkransomware was found to be: Shows suspicious behavior.

Malicious Activity Summary

persistence spyware stealer

Executes dropped EXE

Reads user/profile data of web browsers

Adds Run key to start application

Drops file in Windows directory

Unsigned PE

Suspicious use of AdjustPrivilegeToken

Suspicious use of WriteProcessMemory

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-06-11 18:00

Signatures

Unsigned PE

Description Indicator Process Target
N/A N/A N/A N/A

Analysis: behavioral1

Detonation Overview

Submitted

2024-06-11 18:00

Reported

2024-06-11 18:02

Platform

win7-20231129-en

Max time kernel

122s

Max time network

123s

Command Line

"C:\Users\Admin\AppData\Local\Temp\2024-06-11_88af66a07ddc2cdf772ce0806f196e0c_bkransomware.exe"

Signatures

Executes dropped EXE

Description Indicator Process Target
N/A N/A C:\Windows\CTS.exe N/A

Reads user/profile data of web browsers

spyware stealer

Adds Run key to start application

persistence
Description Indicator Process Target
Set value (str) \REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Run\CTS = "C:\\Windows\\CTS.exe" C:\Users\Admin\AppData\Local\Temp\2024-06-11_88af66a07ddc2cdf772ce0806f196e0c_bkransomware.exe N/A
Set value (str) \REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Run\CTS = "C:\\Windows\\CTS.exe" C:\Windows\CTS.exe N/A

Drops file in Windows directory

Description Indicator Process Target
File created C:\Windows\CTS.exe C:\Users\Admin\AppData\Local\Temp\2024-06-11_88af66a07ddc2cdf772ce0806f196e0c_bkransomware.exe N/A
File created C:\Windows\CTS.exe C:\Windows\CTS.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\2024-06-11_88af66a07ddc2cdf772ce0806f196e0c_bkransomware.exe N/A
Token: SeDebugPrivilege N/A C:\Windows\CTS.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\2024-06-11_88af66a07ddc2cdf772ce0806f196e0c_bkransomware.exe

"C:\Users\Admin\AppData\Local\Temp\2024-06-11_88af66a07ddc2cdf772ce0806f196e0c_bkransomware.exe"

C:\Windows\CTS.exe

"C:\Windows\CTS.exe"

Network

N/A

Files

C:\Windows\CTS.exe

MD5 66df4ffab62e674af2e75b163563fc0b
SHA1 dec8a197312e41eeb3cfef01cb2a443f0205cd6e
SHA256 075a6eecd8da1795532318f9cf880efe42461f9464d63f74deb271d33110f163
SHA512 1588dd78e6e8972013c40cdb6acfb84c8df7b081197233ce621904b645356c805d0424bb93dd46c55834dc47d9ff39ee1323cf8e670841b3fff24ab98ba87f25

C:\Users\Admin\AppData\Local\Temp\xrz1in8MJJLxcpo.exe

MD5 b17237106e3e61287a8b931c53ad0b36
SHA1 bf69f602c2d9fe7517d60338beccfdeb9cd82cf3
SHA256 ad170810dc362014ac822986695143432b99a5a001711bc4466426f9b8288d6b
SHA512 50fb40e96b1ad8ae349cf550d3bf5693c595081d6f22a27528845dcd3ff6051fe20ffaad04781edaf65a0b1b2c6a43af8b09c2e142e01325f088fa708126fe54

Analysis: behavioral2

Detonation Overview

Submitted

2024-06-11 18:00

Reported

2024-06-11 18:02

Platform

win10v2004-20240508-en

Max time kernel

51s

Max time network

52s

Command Line

"C:\Users\Admin\AppData\Local\Temp\2024-06-11_88af66a07ddc2cdf772ce0806f196e0c_bkransomware.exe"

Signatures

Executes dropped EXE

Description Indicator Process Target
N/A N/A C:\Windows\CTS.exe N/A

Reads user/profile data of web browsers

spyware stealer

Adds Run key to start application

persistence
Description Indicator Process Target
Set value (str) \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\CTS = "C:\\Windows\\CTS.exe" C:\Users\Admin\AppData\Local\Temp\2024-06-11_88af66a07ddc2cdf772ce0806f196e0c_bkransomware.exe N/A
Set value (str) \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\CTS = "C:\\Windows\\CTS.exe" C:\Windows\CTS.exe N/A

Drops file in Windows directory

Description Indicator Process Target
File created C:\Windows\CTS.exe C:\Users\Admin\AppData\Local\Temp\2024-06-11_88af66a07ddc2cdf772ce0806f196e0c_bkransomware.exe N/A
File created C:\Windows\CTS.exe C:\Windows\CTS.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\2024-06-11_88af66a07ddc2cdf772ce0806f196e0c_bkransomware.exe N/A
Token: SeDebugPrivilege N/A C:\Windows\CTS.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\2024-06-11_88af66a07ddc2cdf772ce0806f196e0c_bkransomware.exe

"C:\Users\Admin\AppData\Local\Temp\2024-06-11_88af66a07ddc2cdf772ce0806f196e0c_bkransomware.exe"

C:\Windows\CTS.exe

"C:\Windows\CTS.exe"

Network

Files

C:\Windows\CTS.exe

MD5 66df4ffab62e674af2e75b163563fc0b
SHA1 dec8a197312e41eeb3cfef01cb2a443f0205cd6e
SHA256 075a6eecd8da1795532318f9cf880efe42461f9464d63f74deb271d33110f163
SHA512 1588dd78e6e8972013c40cdb6acfb84c8df7b081197233ce621904b645356c805d0424bb93dd46c55834dc47d9ff39ee1323cf8e670841b3fff24ab98ba87f25

C:\Users\Admin\AppData\Local\Microsoft\Office\16.0\excel.exe_Rules.xml

MD5 8160a200297e7a390d8af933af0b9e33
SHA1 e729a70544d3eaa2e4f91961fd60cd4267be21c0
SHA256 9a9cd82e73cafc13b0101a6f043198fb0b809d92b0d34e54e3e29f89c621777a
SHA512 443f0d876abf3d0b0159732934323fbfbc7a1c87042033c793b68a192580c2d716234ef87610843c5e76adca60058861234c3ec95259e959be6cc4b5174006fc

C:\Users\Admin\AppData\Local\Temp\XqXc1i1RwaffjiH.exe

MD5 c6982a4f5884324356f7d4260c5f3e8f
SHA1 9a1d0656f0ebe40caaeb2829ef9c3cae1e9415dd
SHA256 728be988ee90bfc1ac3a03afa7807d1bbefa7a74dc4dc12be42bf60297c9e8b7
SHA512 852d6845c45c76303a27d5f855bb7f8d3227a61c2d5cddd11ffc4ce029909c3e78baec0f0e2cb974f7789fb5ce43b69be082925958f672726417cff5716e9384