Analysis
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max time kernel
120s -
max time network
120s -
platform
windows7_x64 -
resource
win7-20240221-en -
resource tags
arch:x64arch:x86image:win7-20240221-enlocale:en-usos:windows7-x64system -
submitted
27-05-2024 06:57
Static task
static1
Behavioral task
behavioral1
Sample
2024-05-27_f81b59d631c1421ecbfa5d631a7dbedb_bkransomware.exe
Resource
win7-20240221-en
Behavioral task
behavioral2
Sample
2024-05-27_f81b59d631c1421ecbfa5d631a7dbedb_bkransomware.exe
Resource
win10v2004-20240508-en
General
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Target
2024-05-27_f81b59d631c1421ecbfa5d631a7dbedb_bkransomware.exe
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Size
135KB
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MD5
f81b59d631c1421ecbfa5d631a7dbedb
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SHA1
02cb93d524caa36e45b65e6f7de29965cf8f194e
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SHA256
ea6f01132d75d8beea01ccd42ddf42501cff90c6f7db2e83526600d689e3c931
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SHA512
c360809d1e00b7391b68ba553ac877c2cdb49c661f1c02a4c259f988db0c66e4d887a1a3f7af78f77dcb94769c92f432abc072269a579891c452d8d959aefc3f
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SSDEEP
3072:ZRpAyazIliazT9i+P+AupTruo7UnQKLbTRt:xZ8azpi+cxRU
Malware Config
Signatures
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Executes dropped EXE 2 IoCs
Processes:
CTS.exeWJJWaDjUgr56wCz.exepid process 2456 CTS.exe 1908 WJJWaDjUgr56wCz.exe -
Loads dropped DLL 2 IoCs
Processes:
2024-05-27_f81b59d631c1421ecbfa5d631a7dbedb_bkransomware.exepid process 1900 2024-05-27_f81b59d631c1421ecbfa5d631a7dbedb_bkransomware.exe 1900 2024-05-27_f81b59d631c1421ecbfa5d631a7dbedb_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:
2024-05-27_f81b59d631c1421ecbfa5d631a7dbedb_bkransomware.exeCTS.exedescription ioc process Set value (str) \REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Run\CTS = "C:\\Windows\\CTS.exe" 2024-05-27_f81b59d631c1421ecbfa5d631a7dbedb_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:
2024-05-27_f81b59d631c1421ecbfa5d631a7dbedb_bkransomware.exeCTS.exedescription ioc process File created C:\Windows\CTS.exe 2024-05-27_f81b59d631c1421ecbfa5d631a7dbedb_bkransomware.exe File created C:\Windows\CTS.exe CTS.exe -
Suspicious use of AdjustPrivilegeToken 2 IoCs
Processes:
2024-05-27_f81b59d631c1421ecbfa5d631a7dbedb_bkransomware.exeCTS.exedescription pid process Token: SeDebugPrivilege 1900 2024-05-27_f81b59d631c1421ecbfa5d631a7dbedb_bkransomware.exe Token: SeDebugPrivilege 2456 CTS.exe -
Suspicious use of WriteProcessMemory 8 IoCs
Processes:
2024-05-27_f81b59d631c1421ecbfa5d631a7dbedb_bkransomware.exedescription pid process target process PID 1900 wrote to memory of 1908 1900 2024-05-27_f81b59d631c1421ecbfa5d631a7dbedb_bkransomware.exe WJJWaDjUgr56wCz.exe PID 1900 wrote to memory of 1908 1900 2024-05-27_f81b59d631c1421ecbfa5d631a7dbedb_bkransomware.exe WJJWaDjUgr56wCz.exe PID 1900 wrote to memory of 1908 1900 2024-05-27_f81b59d631c1421ecbfa5d631a7dbedb_bkransomware.exe WJJWaDjUgr56wCz.exe PID 1900 wrote to memory of 1908 1900 2024-05-27_f81b59d631c1421ecbfa5d631a7dbedb_bkransomware.exe WJJWaDjUgr56wCz.exe PID 1900 wrote to memory of 2456 1900 2024-05-27_f81b59d631c1421ecbfa5d631a7dbedb_bkransomware.exe CTS.exe PID 1900 wrote to memory of 2456 1900 2024-05-27_f81b59d631c1421ecbfa5d631a7dbedb_bkransomware.exe CTS.exe PID 1900 wrote to memory of 2456 1900 2024-05-27_f81b59d631c1421ecbfa5d631a7dbedb_bkransomware.exe CTS.exe PID 1900 wrote to memory of 2456 1900 2024-05-27_f81b59d631c1421ecbfa5d631a7dbedb_bkransomware.exe CTS.exe
Processes
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C:\Users\Admin\AppData\Local\Temp\2024-05-27_f81b59d631c1421ecbfa5d631a7dbedb_bkransomware.exe"C:\Users\Admin\AppData\Local\Temp\2024-05-27_f81b59d631c1421ecbfa5d631a7dbedb_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
PID:1900 -
C:\Users\Admin\AppData\Local\Temp\WJJWaDjUgr56wCz.exeC:\Users\Admin\AppData\Local\Temp\WJJWaDjUgr56wCz.exe2⤵
- Executes dropped EXE
PID:1908 -
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
PID:2456
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
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Filesize
71KB
MD5f9d4ab0a726adc9b5e4b7d7b724912f1
SHA13d42ca2098475924f70ee4a831c4f003b4682328
SHA256b43be87e8586ca5e995979883468f3b3d9dc5212fbfd0b5f3341a5b7c56e0fbc
SHA51222a5f0e4b2716244e978ee50771823926f86baf0382ece48fd049f039cf77b5eb0691d83c61148903cff081fdbea969f47b8ed521647717f42bbed5c64552432
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Filesize
64KB
MD5a32a382b8a5a906e03a83b4f3e5b7a9b
SHA111e2bdd0798761f93cce363329996af6c17ed796
SHA25675f12ea2f30d9c0d872dade345f30f562e6d93847b6a509ba53beec6d0b2c346
SHA512ec87dd957be21b135212454646dcabdd7ef9442cf714e2c1f6b42b81f0c3fa3b1875bde9a8b538e8a0aa2190225649c29e9ed0f25176e7659e55e422dd4efe4c