Analysis
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max time kernel
133s -
max time network
124s -
platform
windows10-2004_x64 -
resource
win10v2004-20240508-en -
resource tags
arch:x64arch:x86image:win10v2004-20240508-enlocale:en-usos:windows10-2004-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:
PXIlzFeKZmjfxH3.exeCTS.exepid process 1348 PXIlzFeKZmjfxH3.exe 2924 CTS.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 3652 2024-05-27_f81b59d631c1421ecbfa5d631a7dbedb_bkransomware.exe Token: SeDebugPrivilege 2924 CTS.exe -
Suspicious use of WriteProcessMemory 6 IoCs
Processes:
2024-05-27_f81b59d631c1421ecbfa5d631a7dbedb_bkransomware.exedescription pid process target process PID 3652 wrote to memory of 1348 3652 2024-05-27_f81b59d631c1421ecbfa5d631a7dbedb_bkransomware.exe PXIlzFeKZmjfxH3.exe PID 3652 wrote to memory of 1348 3652 2024-05-27_f81b59d631c1421ecbfa5d631a7dbedb_bkransomware.exe PXIlzFeKZmjfxH3.exe PID 3652 wrote to memory of 1348 3652 2024-05-27_f81b59d631c1421ecbfa5d631a7dbedb_bkransomware.exe PXIlzFeKZmjfxH3.exe PID 3652 wrote to memory of 2924 3652 2024-05-27_f81b59d631c1421ecbfa5d631a7dbedb_bkransomware.exe CTS.exe PID 3652 wrote to memory of 2924 3652 2024-05-27_f81b59d631c1421ecbfa5d631a7dbedb_bkransomware.exe CTS.exe PID 3652 wrote to memory of 2924 3652 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⤵
- 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\PXIlzFeKZmjfxH3.exeC:\Users\Admin\AppData\Local\Temp\PXIlzFeKZmjfxH3.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:\Users\Admin\AppData\Local\Microsoft\Office\16.0\excel.exe_Rules.xmlFilesize
394KB
MD5d42aca51afd0bcf4b35db2b856456e10
SHA1f08a1f8aea437363709deeec93f2f45b77bdaa8d
SHA2565afca557ce0cfc6dc879c6d6b9041399df69b1fd27d0f01451199c8bfb566ee5
SHA5120ad6d3260adc5cac3c501bd67d27ff9df3c54eaa739ce6b4e5dab9b3102d5172f8ef7beb1d2f5af42c76d776dab665e46c3ed14f69815da70427da4290b6b656
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C:\Users\Admin\AppData\Local\Temp\PXIlzFeKZmjfxH3.exeFilesize
64KB
MD5a32a382b8a5a906e03a83b4f3e5b7a9b
SHA111e2bdd0798761f93cce363329996af6c17ed796
SHA25675f12ea2f30d9c0d872dade345f30f562e6d93847b6a509ba53beec6d0b2c346
SHA512ec87dd957be21b135212454646dcabdd7ef9442cf714e2c1f6b42b81f0c3fa3b1875bde9a8b538e8a0aa2190225649c29e9ed0f25176e7659e55e422dd4efe4c
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C:\Windows\CTS.exeFilesize
71KB
MD5f9d4ab0a726adc9b5e4b7d7b724912f1
SHA13d42ca2098475924f70ee4a831c4f003b4682328
SHA256b43be87e8586ca5e995979883468f3b3d9dc5212fbfd0b5f3341a5b7c56e0fbc
SHA51222a5f0e4b2716244e978ee50771823926f86baf0382ece48fd049f039cf77b5eb0691d83c61148903cff081fdbea969f47b8ed521647717f42bbed5c64552432