Analysis
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max time kernel
55s -
max time network
54s -
platform
windows10-2004_x64 -
resource
win10v2004-20240419-en -
resource tags
arch:x64arch:x86image:win10v2004-20240419-enlocale:en-usos:windows10-2004-x64system -
submitted
28-04-2024 14:53
Static task
static1
Behavioral task
behavioral1
Sample
2024-04-28_d4d3223823e7af9d4dfd66830cf5e924_bkransomware.exe
Resource
win7-20240221-en
Behavioral task
behavioral2
Sample
2024-04-28_d4d3223823e7af9d4dfd66830cf5e924_bkransomware.exe
Resource
win10v2004-20240419-en
General
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Target
2024-04-28_d4d3223823e7af9d4dfd66830cf5e924_bkransomware.exe
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Size
96KB
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MD5
d4d3223823e7af9d4dfd66830cf5e924
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SHA1
0291c8cfb3fb01bfa04273acd0fec2b1d07fb544
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SHA256
612cb1195d6f67dd3b504b1a99f04d483995980edd9138e69022a2583477fcf0
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SHA512
bf69a814fceebd1a6fc1f5264d2ed0e4064dac0deafc5ffd0c07662a80a1c6cf5f1aa6a74c5badc0375f5353185dd9879761e7d0f8201ca67adccbec9d203ff2
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SSDEEP
1536:Fc897UsWjcd9w+AyabjDbxE+MwmvlDuazTS+USvITZrBv4/o9nKbiRFpJcEyHnR:ZhpAyazIlyazTtOFv4g9KbiRhyHnR
Malware Config
Signatures
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Executes dropped EXE 2 IoCs
Processes:
rCaxt3Jq42LGt9q.exeCTS.exepid process 2720 rCaxt3Jq42LGt9q.exe 1884 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_d4d3223823e7af9d4dfd66830cf5e924_bkransomware.exeCTS.exedescription ioc process Set value (str) \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\CTS = "C:\\Windows\\CTS.exe" 2024-04-28_d4d3223823e7af9d4dfd66830cf5e924_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_d4d3223823e7af9d4dfd66830cf5e924_bkransomware.exeCTS.exedescription ioc process File created C:\Windows\CTS.exe 2024-04-28_d4d3223823e7af9d4dfd66830cf5e924_bkransomware.exe File created C:\Windows\CTS.exe CTS.exe -
Suspicious use of AdjustPrivilegeToken 2 IoCs
Processes:
2024-04-28_d4d3223823e7af9d4dfd66830cf5e924_bkransomware.exeCTS.exedescription pid process Token: SeDebugPrivilege 1332 2024-04-28_d4d3223823e7af9d4dfd66830cf5e924_bkransomware.exe Token: SeDebugPrivilege 1884 CTS.exe -
Suspicious use of WriteProcessMemory 5 IoCs
Processes:
2024-04-28_d4d3223823e7af9d4dfd66830cf5e924_bkransomware.exedescription pid process target process PID 1332 wrote to memory of 2720 1332 2024-04-28_d4d3223823e7af9d4dfd66830cf5e924_bkransomware.exe rCaxt3Jq42LGt9q.exe PID 1332 wrote to memory of 2720 1332 2024-04-28_d4d3223823e7af9d4dfd66830cf5e924_bkransomware.exe rCaxt3Jq42LGt9q.exe PID 1332 wrote to memory of 1884 1332 2024-04-28_d4d3223823e7af9d4dfd66830cf5e924_bkransomware.exe CTS.exe PID 1332 wrote to memory of 1884 1332 2024-04-28_d4d3223823e7af9d4dfd66830cf5e924_bkransomware.exe CTS.exe PID 1332 wrote to memory of 1884 1332 2024-04-28_d4d3223823e7af9d4dfd66830cf5e924_bkransomware.exe CTS.exe
Processes
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C:\Users\Admin\AppData\Local\Temp\2024-04-28_d4d3223823e7af9d4dfd66830cf5e924_bkransomware.exe"C:\Users\Admin\AppData\Local\Temp\2024-04-28_d4d3223823e7af9d4dfd66830cf5e924_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\rCaxt3Jq42LGt9q.exeC:\Users\Admin\AppData\Local\Temp\rCaxt3Jq42LGt9q.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
392KB
MD52d82e2ab05da3b15a4243df183124cc0
SHA1c3ad46ade0801c5020332bf23a7abe1c8d6edc8c
SHA2566e0f7ca8fdc0b78abf6fc7adb97abd38cdd739190435209794f560d774159e6d
SHA51269d8d6197f0c05d80e1736c531629b18436ba150410419ebb8b65aef3eafb8a17bdd08435efd55a8a0afe8f1168b3506468ab4cc6e05ecbb46a917493353edb3
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C:\Users\Admin\AppData\Local\Temp\rCaxt3Jq42LGt9q.exeFilesize
25KB
MD5abbd49c180a2f8703f6306d6fa731fdc
SHA1d63f4bfe7f74936b2fbace803e3da6103fbf6586
SHA2565f411c0bd9ed9a42b0f07ed568c7d0cf358a83063b225a1f8f7da3296dde90f1
SHA512290dd984acc451b778f3db8c510bae7aec1d9547c3ad0a1829df731c136e4ecc9a37dc6a786cf8f1ecc4d14339aed1288af25055f450f6f953138c8d4d5c36e9
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C:\Windows\CTS.exeFilesize
71KB
MD566df4ffab62e674af2e75b163563fc0b
SHA1dec8a197312e41eeb3cfef01cb2a443f0205cd6e
SHA256075a6eecd8da1795532318f9cf880efe42461f9464d63f74deb271d33110f163
SHA5121588dd78e6e8972013c40cdb6acfb84c8df7b081197233ce621904b645356c805d0424bb93dd46c55834dc47d9ff39ee1323cf8e670841b3fff24ab98ba87f25
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memory/2720-12-0x0000000000400000-0x000000000040D000-memory.dmpFilesize
52KB