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Analysis
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max time kernel
129s -
max time network
124s -
platform
windows10-2004_x64 -
resource
win10v2004-20240419-en -
resource tags
arch:x64arch:x86image:win10v2004-20240419-enlocale:en-usos:windows10-2004-x64system -
submitted
04/05/2024, 02:28
Static task
static1
Behavioral task
behavioral1
Sample
2024-05-04_793c19d1b1924506d07f20a7f5221d9b_bkransomware.exe
Resource
win7-20240220-en
Behavioral task
behavioral2
Sample
2024-05-04_793c19d1b1924506d07f20a7f5221d9b_bkransomware.exe
Resource
win10v2004-20240419-en
General
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Target
2024-05-04_793c19d1b1924506d07f20a7f5221d9b_bkransomware.exe
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Size
71KB
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MD5
793c19d1b1924506d07f20a7f5221d9b
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SHA1
a40b74ddac18599e3fbe01abee0d4439e24c6dd4
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SHA256
9dba025eae42a0332374d1f2e6c28dd3db6140ee2e30eacb1f45c1e6952d6b5e
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SHA512
2d934cc17375d4da37ed4ce11e69420b0eaf34598ce20cb879836468f736eae392a6ec9b112a3bbb3a6c8594e85484cc8c2958a8306528912d1f3f84f5260b2e
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SSDEEP
1536:Fc897UsWjcd9w+AyabjDbxE+MwmvlDuazTu:ZhpAyazIlyazTu
Malware Config
Signatures
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Executes dropped EXE 1 IoCs
pid Process 4332 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
description ioc Process Set value (str) \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\CTS = "C:\\Windows\\CTS.exe" 2024-05-04_793c19d1b1924506d07f20a7f5221d9b_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
description ioc Process File created C:\Windows\CTS.exe CTS.exe File created C:\Windows\CTS.exe 2024-05-04_793c19d1b1924506d07f20a7f5221d9b_bkransomware.exe -
Suspicious use of AdjustPrivilegeToken 2 IoCs
description pid Process Token: SeDebugPrivilege 4948 2024-05-04_793c19d1b1924506d07f20a7f5221d9b_bkransomware.exe Token: SeDebugPrivilege 4332 CTS.exe -
Suspicious use of WriteProcessMemory 3 IoCs
description pid Process procid_target PID 4948 wrote to memory of 4332 4948 2024-05-04_793c19d1b1924506d07f20a7f5221d9b_bkransomware.exe 83 PID 4948 wrote to memory of 4332 4948 2024-05-04_793c19d1b1924506d07f20a7f5221d9b_bkransomware.exe 83 PID 4948 wrote to memory of 4332 4948 2024-05-04_793c19d1b1924506d07f20a7f5221d9b_bkransomware.exe 83
Processes
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C:\Users\Admin\AppData\Local\Temp\2024-05-04_793c19d1b1924506d07f20a7f5221d9b_bkransomware.exe"C:\Users\Admin\AppData\Local\Temp\2024-05-04_793c19d1b1924506d07f20a7f5221d9b_bkransomware.exe"1⤵
- Adds Run key to start application
- Drops file in Windows directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4948 -
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:4332
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Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
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Filesize
393KB
MD5d75b78847a619b59258e3f55811cebc2
SHA17d901433a286d1b812982a5fbb769b31231d5765
SHA256af3b2875e08fde0e08328540b3c3590e564ef160a5fdedf0d2910beb103f0d3b
SHA51238c8433b97b1d6acd62872c51ca96dfc6205c388e16b826f6703ac188102d21336626d5069b036c3d1f1d81d5c4e3a6b861e46057d8989c659ee3551831c33b0
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Filesize
71KB
MD5f179d3af0639021e2da7ea725af0e13c
SHA14501f7b3f37b16ce4b1da3900d67ddce9eff38ad
SHA2568f6788b066238017da55eaca463bcef5e07dad2b3a875eaaf71f71bac20c6721
SHA512461c8087450d3cd41393072e57063b16fe3af1cb0f115f44058891cb0d62671840b055c3d9120fb2af98237903ec97973acc9c9bca9690a6b9d2a1d73d5933df
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Filesize
71KB
MD566df4ffab62e674af2e75b163563fc0b
SHA1dec8a197312e41eeb3cfef01cb2a443f0205cd6e
SHA256075a6eecd8da1795532318f9cf880efe42461f9464d63f74deb271d33110f163
SHA5121588dd78e6e8972013c40cdb6acfb84c8df7b081197233ce621904b645356c805d0424bb93dd46c55834dc47d9ff39ee1323cf8e670841b3fff24ab98ba87f25