Analysis
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max time kernel
117s -
max time network
118s -
platform
windows7_x64 -
resource
win7-20240221-en -
resource tags
arch:x64arch:x86image:win7-20240221-enlocale:en-usos:windows7-x64system -
submitted
23-05-2024 03:42
Static task
static1
Behavioral task
behavioral1
Sample
2024-05-23_7b63d6078b19f01a820afc4d1c85662a_bkransomware.exe
Resource
win7-20240221-en
Behavioral task
behavioral2
Sample
2024-05-23_7b63d6078b19f01a820afc4d1c85662a_bkransomware.exe
Resource
win10v2004-20240508-en
General
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Target
2024-05-23_7b63d6078b19f01a820afc4d1c85662a_bkransomware.exe
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Size
108KB
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MD5
7b63d6078b19f01a820afc4d1c85662a
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SHA1
ade3d124ef86295121e9eb2d4fba6ca4f0aba570
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SHA256
b7b066a77ec79f811f75b96770fe1d1e9f02ca6c9d4898bfc298101230347f7a
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SHA512
e1847bbe027a5cb9137850b29d0d633824be2959ec6f78d5159ddfb72f9626605ef13c792be348235e21a13a667daf9d85026172033540204bea4b58e913eb89
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SSDEEP
1536:Fc897UsWjcd9w+AyabjDbxE+MwmvlDuazTMhUaV76teZBSft2yWFx:ZhpAyazIlyazToVqevSfY/Fx
Malware Config
Signatures
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Executes dropped EXE 2 IoCs
Processes:
USf1rLzzk23kHks.exeCTS.exepid process 2272 USf1rLzzk23kHks.exe 2740 CTS.exe -
Loads dropped DLL 1 IoCs
Processes:
2024-05-23_7b63d6078b19f01a820afc4d1c85662a_bkransomware.exepid process 2168 2024-05-23_7b63d6078b19f01a820afc4d1c85662a_bkransomware.exe -
Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
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Adds Run key to start application 2 TTPs 2 IoCs
Processes:
2024-05-23_7b63d6078b19f01a820afc4d1c85662a_bkransomware.exeCTS.exedescription ioc process Set value (str) \REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Run\CTS = "C:\\Windows\\CTS.exe" 2024-05-23_7b63d6078b19f01a820afc4d1c85662a_bkransomware.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Run\CTS = "C:\\Windows\\CTS.exe" CTS.exe -
Drops file in Windows directory 2 IoCs
Processes:
2024-05-23_7b63d6078b19f01a820afc4d1c85662a_bkransomware.exeCTS.exedescription ioc process File created C:\Windows\CTS.exe 2024-05-23_7b63d6078b19f01a820afc4d1c85662a_bkransomware.exe File created C:\Windows\CTS.exe CTS.exe -
Suspicious use of AdjustPrivilegeToken 2 IoCs
Processes:
2024-05-23_7b63d6078b19f01a820afc4d1c85662a_bkransomware.exeCTS.exedescription pid process Token: SeDebugPrivilege 2168 2024-05-23_7b63d6078b19f01a820afc4d1c85662a_bkransomware.exe Token: SeDebugPrivilege 2740 CTS.exe -
Suspicious use of WriteProcessMemory 8 IoCs
Processes:
2024-05-23_7b63d6078b19f01a820afc4d1c85662a_bkransomware.exedescription pid process target process PID 2168 wrote to memory of 2272 2168 2024-05-23_7b63d6078b19f01a820afc4d1c85662a_bkransomware.exe USf1rLzzk23kHks.exe PID 2168 wrote to memory of 2272 2168 2024-05-23_7b63d6078b19f01a820afc4d1c85662a_bkransomware.exe USf1rLzzk23kHks.exe PID 2168 wrote to memory of 2272 2168 2024-05-23_7b63d6078b19f01a820afc4d1c85662a_bkransomware.exe USf1rLzzk23kHks.exe PID 2168 wrote to memory of 2272 2168 2024-05-23_7b63d6078b19f01a820afc4d1c85662a_bkransomware.exe USf1rLzzk23kHks.exe PID 2168 wrote to memory of 2740 2168 2024-05-23_7b63d6078b19f01a820afc4d1c85662a_bkransomware.exe CTS.exe PID 2168 wrote to memory of 2740 2168 2024-05-23_7b63d6078b19f01a820afc4d1c85662a_bkransomware.exe CTS.exe PID 2168 wrote to memory of 2740 2168 2024-05-23_7b63d6078b19f01a820afc4d1c85662a_bkransomware.exe CTS.exe PID 2168 wrote to memory of 2740 2168 2024-05-23_7b63d6078b19f01a820afc4d1c85662a_bkransomware.exe CTS.exe
Processes
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C:\Users\Admin\AppData\Local\Temp\2024-05-23_7b63d6078b19f01a820afc4d1c85662a_bkransomware.exe"C:\Users\Admin\AppData\Local\Temp\2024-05-23_7b63d6078b19f01a820afc4d1c85662a_bkransomware.exe"1⤵
- Loads dropped DLL
- Adds Run key to start application
- Drops file in Windows directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Local\Temp\USf1rLzzk23kHks.exeC:\Users\Admin\AppData\Local\Temp\USf1rLzzk23kHks.exe2⤵
- Executes dropped EXE
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C:\Windows\CTS.exe"C:\Windows\CTS.exe"2⤵
- Executes dropped EXE
- Adds Run key to start application
- Drops file in Windows directory
- Suspicious use of AdjustPrivilegeToken
Network
MITRE ATT&CK Matrix ATT&CK v13
Replay Monitor
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Downloads
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C:\Windows\CTS.exeFilesize
71KB
MD566df4ffab62e674af2e75b163563fc0b
SHA1dec8a197312e41eeb3cfef01cb2a443f0205cd6e
SHA256075a6eecd8da1795532318f9cf880efe42461f9464d63f74deb271d33110f163
SHA5121588dd78e6e8972013c40cdb6acfb84c8df7b081197233ce621904b645356c805d0424bb93dd46c55834dc47d9ff39ee1323cf8e670841b3fff24ab98ba87f25
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\Users\Admin\AppData\Local\Temp\USf1rLzzk23kHks.exeFilesize
37KB
MD5371627fd939bb54ed26f473ca54e718f
SHA13a6910295ae9d1fe388b7572736b8bdfc6e0d111
SHA256b5481e424246a174456add0132427df3a7cd4105f5769835cdf597966c7c0b61
SHA512ff7ea5ae445089ffa808c97e23c620313dd267994b343176c0cb9f8098aace1d12d9212b96611fdf97c974ef94f866b817aed9c0e5f4f195234e7d8d4ec3f8cd
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memory/2272-12-0x000007FEF54F3000-0x000007FEF54F4000-memory.dmpFilesize
4KB
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memory/2272-13-0x0000000000380000-0x000000000038E000-memory.dmpFilesize
56KB
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memory/2272-15-0x000007FEF54F0000-0x000007FEF5EDC000-memory.dmpFilesize
9.9MB