Analysis
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max time kernel
120s -
max time network
121s -
platform
windows7_x64 -
resource
win7-20240220-en -
resource tags
arch:x64arch:x86image:win7-20240220-enlocale:en-usos:windows7-x64system -
submitted
28-04-2024 19:29
Static task
static1
Behavioral task
behavioral1
Sample
2024-04-28_5f9719c57238b5973839d8a084008740_bkransomware.exe
Resource
win7-20240220-en
Behavioral task
behavioral2
Sample
2024-04-28_5f9719c57238b5973839d8a084008740_bkransomware.exe
Resource
win10v2004-20240419-en
General
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Target
2024-04-28_5f9719c57238b5973839d8a084008740_bkransomware.exe
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Size
76KB
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MD5
5f9719c57238b5973839d8a084008740
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SHA1
b63f778e77dbcc6c87be13b55a07bbacc710b1e7
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SHA256
565462b36e41374e3fd497ae5cee5d065645c8298fc11405e2b4264149896b2f
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SHA512
41e8be352409932e3d7f344e2866dce61133c3d955a7e9aeee092ad0ff6dbf441e34f7bfc2352b78f1a2fb5a32bd78efad2dbb5c92f871a1c095c294b68e2b99
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SSDEEP
1536:Fc897UsWjcd9w+AyabjDbxE+MwmvlDuazTLgXS6G:ZhpAyazIlyazTAS6G
Malware Config
Signatures
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Executes dropped EXE 1 IoCs
Processes:
CTS.exepid process 2020 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:
2024-04-28_5f9719c57238b5973839d8a084008740_bkransomware.exeCTS.exedescription ioc process Set value (str) \REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Run\CTS = "C:\\Windows\\CTS.exe" 2024-04-28_5f9719c57238b5973839d8a084008740_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:
2024-04-28_5f9719c57238b5973839d8a084008740_bkransomware.exeCTS.exedescription ioc process File created C:\Windows\CTS.exe 2024-04-28_5f9719c57238b5973839d8a084008740_bkransomware.exe File created C:\Windows\CTS.exe CTS.exe -
Suspicious use of AdjustPrivilegeToken 2 IoCs
Processes:
2024-04-28_5f9719c57238b5973839d8a084008740_bkransomware.exeCTS.exedescription pid process Token: SeDebugPrivilege 1636 2024-04-28_5f9719c57238b5973839d8a084008740_bkransomware.exe Token: SeDebugPrivilege 2020 CTS.exe -
Suspicious use of WriteProcessMemory 4 IoCs
Processes:
2024-04-28_5f9719c57238b5973839d8a084008740_bkransomware.exedescription pid process target process PID 1636 wrote to memory of 2020 1636 2024-04-28_5f9719c57238b5973839d8a084008740_bkransomware.exe CTS.exe PID 1636 wrote to memory of 2020 1636 2024-04-28_5f9719c57238b5973839d8a084008740_bkransomware.exe CTS.exe PID 1636 wrote to memory of 2020 1636 2024-04-28_5f9719c57238b5973839d8a084008740_bkransomware.exe CTS.exe PID 1636 wrote to memory of 2020 1636 2024-04-28_5f9719c57238b5973839d8a084008740_bkransomware.exe CTS.exe
Processes
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C:\Users\Admin\AppData\Local\Temp\2024-04-28_5f9719c57238b5973839d8a084008740_bkransomware.exe"C:\Users\Admin\AppData\Local\Temp\2024-04-28_5f9719c57238b5973839d8a084008740_bkransomware.exe"1⤵
- Adds Run key to start application
- Drops file in Windows directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1636 -
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:2020
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
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C:\Users\Admin\AppData\Local\Temp\qyNctGMzvKiiPTC.exeFilesize
76KB
MD596a812f6b80e9804806ec025c13365a0
SHA1a72d1f749b6b6cc0178df97307d383c2366dc6ac
SHA256258c0ba4d5a698a6b215925b39c5d457b282e390f268692fd0213c6f86f0db15
SHA512e11691dc7fbd4f189492d101839d9d3c2ff18bbe50e1b0605d1f3a8d50d3d7b9f0b07890b7813a63a54c6d4d0b17ef62b495af5617fc7577e6a4b6834ca37a0d
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C:\Windows\CTS.exeFilesize
71KB
MD566df4ffab62e674af2e75b163563fc0b
SHA1dec8a197312e41eeb3cfef01cb2a443f0205cd6e
SHA256075a6eecd8da1795532318f9cf880efe42461f9464d63f74deb271d33110f163
SHA5121588dd78e6e8972013c40cdb6acfb84c8df7b081197233ce621904b645356c805d0424bb93dd46c55834dc47d9ff39ee1323cf8e670841b3fff24ab98ba87f25