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Analysis
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max time kernel
120s -
max time network
121s -
platform
windows7_x64 -
resource
win7-20240508-en -
resource tags
arch:x64arch:x86image:win7-20240508-enlocale:en-usos:windows7-x64system -
submitted
11/05/2024, 15:33
Static task
static1
Behavioral task
behavioral1
Sample
2024-05-11_c4de79253987ef24561160b0fda73dee_bkransomware.exe
Resource
win7-20240508-en
Behavioral task
behavioral2
Sample
2024-05-11_c4de79253987ef24561160b0fda73dee_bkransomware.exe
Resource
win10v2004-20240426-en
General
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Target
2024-05-11_c4de79253987ef24561160b0fda73dee_bkransomware.exe
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Size
262KB
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MD5
c4de79253987ef24561160b0fda73dee
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SHA1
ad307e6ff2f85567effc74de749f40600ff1615d
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SHA256
9b04e4fc6e74cd2505d574668d0f88d79679af1f12d380d2136f2a785056d9ea
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SHA512
22ba6ef98d1c3023e77dd2b3989b626da6fc8b57881da07474be933d041a72be1205ebd8c33964d24080b7ccb6ae75540e257fda414f60bc9302ec939ac8d83e
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SSDEEP
6144:hZMazhUuJd8Al7t3t891EMu+dKCwLa+gavuMU:hS0WuvrJd8/Es4ana2MU
Malware Config
Signatures
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Executes dropped EXE 2 IoCs
pid Process 2668 l3D5IFGWcIeg1nn.exe 1336 CTS.exe -
Loads dropped DLL 1 IoCs
pid Process 2084 2024-05-11_c4de79253987ef24561160b0fda73dee_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
description ioc Process Set value (str) \REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Run\CTS = "C:\\Windows\\CTS.exe" 2024-05-11_c4de79253987ef24561160b0fda73dee_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 2024-05-11_c4de79253987ef24561160b0fda73dee_bkransomware.exe File created C:\Windows\CTS.exe CTS.exe -
Suspicious use of AdjustPrivilegeToken 2 IoCs
description pid Process Token: SeDebugPrivilege 2084 2024-05-11_c4de79253987ef24561160b0fda73dee_bkransomware.exe Token: SeDebugPrivilege 1336 CTS.exe -
Suspicious use of WriteProcessMemory 8 IoCs
description pid Process procid_target PID 2084 wrote to memory of 2668 2084 2024-05-11_c4de79253987ef24561160b0fda73dee_bkransomware.exe 28 PID 2084 wrote to memory of 2668 2084 2024-05-11_c4de79253987ef24561160b0fda73dee_bkransomware.exe 28 PID 2084 wrote to memory of 2668 2084 2024-05-11_c4de79253987ef24561160b0fda73dee_bkransomware.exe 28 PID 2084 wrote to memory of 2668 2084 2024-05-11_c4de79253987ef24561160b0fda73dee_bkransomware.exe 28 PID 2084 wrote to memory of 1336 2084 2024-05-11_c4de79253987ef24561160b0fda73dee_bkransomware.exe 29 PID 2084 wrote to memory of 1336 2084 2024-05-11_c4de79253987ef24561160b0fda73dee_bkransomware.exe 29 PID 2084 wrote to memory of 1336 2084 2024-05-11_c4de79253987ef24561160b0fda73dee_bkransomware.exe 29 PID 2084 wrote to memory of 1336 2084 2024-05-11_c4de79253987ef24561160b0fda73dee_bkransomware.exe 29
Processes
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C:\Users\Admin\AppData\Local\Temp\2024-05-11_c4de79253987ef24561160b0fda73dee_bkransomware.exe"C:\Users\Admin\AppData\Local\Temp\2024-05-11_c4de79253987ef24561160b0fda73dee_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:2084 -
C:\Users\Admin\AppData\Local\Temp\l3D5IFGWcIeg1nn.exeC:\Users\Admin\AppData\Local\Temp\l3D5IFGWcIeg1nn.exe2⤵
- Executes dropped EXE
PID:2668
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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
PID:1336
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Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
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Filesize
71KB
MD566df4ffab62e674af2e75b163563fc0b
SHA1dec8a197312e41eeb3cfef01cb2a443f0205cd6e
SHA256075a6eecd8da1795532318f9cf880efe42461f9464d63f74deb271d33110f163
SHA5121588dd78e6e8972013c40cdb6acfb84c8df7b081197233ce621904b645356c805d0424bb93dd46c55834dc47d9ff39ee1323cf8e670841b3fff24ab98ba87f25
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Filesize
191KB
MD594a363cd532d88ac33997c25657a19b5
SHA1a98f1a8361d0183651c0ef457b9ac4339e429bea
SHA25613b98844b2fa4a39a4d8ebb414fc79450d5ab4f0c8f5141ac06d40b2a0431ea4
SHA5123b1c87a67f63e4276453ec1e322f0c13896dd0524ef35f4e4037a481ce354feaa98440f85b784c0b90a900c59ef115654f687457180ea433ea0100427f5c26f5