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
27-04-2024 06:33
Static task
static1
Behavioral task
behavioral1
Sample
2024-04-27_896821e90f6bf918c326d86cf0ae2fba_bkransomware.exe
Resource
win7-20240220-en
Behavioral task
behavioral2
Sample
2024-04-27_896821e90f6bf918c326d86cf0ae2fba_bkransomware.exe
Resource
win10v2004-20240419-en
General
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Target
2024-04-27_896821e90f6bf918c326d86cf0ae2fba_bkransomware.exe
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Size
96KB
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MD5
896821e90f6bf918c326d86cf0ae2fba
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SHA1
064dcb42eb27fc3d5a99bffdb02c7ff9956917e0
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SHA256
c1d5553113fb919ddcc5d368750ea75e71305174cc1b48f1d80a47e15e6436b2
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SHA512
c83f11b974784b2c15aced354ddd7a41afc927795bdbd496eba2f739e3c24eb5dc34b7d9084ca47db6ab4475bd11ab83bbb09eb1d5ce75ed9d1df27f278e1dc0
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SSDEEP
1536:Fc897UsWjcd9w+AyabjDbxE+MwmvlDuazTq0+oChNXic0Wmpnt9N8p/Om:ZhpAyazIlyazTIoChpicwt9N8Am
Malware Config
Signatures
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Executes dropped EXE 2 IoCs
Processes:
HcSEKtLStuV3HBB.exeCTS.exepid process 2924 HcSEKtLStuV3HBB.exe 2956 CTS.exe -
Loads dropped DLL 3 IoCs
Processes:
2024-04-27_896821e90f6bf918c326d86cf0ae2fba_bkransomware.exepid process 2872 2024-04-27_896821e90f6bf918c326d86cf0ae2fba_bkransomware.exe 2872 2024-04-27_896821e90f6bf918c326d86cf0ae2fba_bkransomware.exe 2904 -
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:
2024-04-27_896821e90f6bf918c326d86cf0ae2fba_bkransomware.exeCTS.exedescription ioc process Set value (str) \REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Run\CTS = "C:\\Windows\\CTS.exe" 2024-04-27_896821e90f6bf918c326d86cf0ae2fba_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:
2024-04-27_896821e90f6bf918c326d86cf0ae2fba_bkransomware.exeCTS.exedescription ioc process File created C:\Windows\CTS.exe 2024-04-27_896821e90f6bf918c326d86cf0ae2fba_bkransomware.exe File created C:\Windows\CTS.exe CTS.exe -
Suspicious use of AdjustPrivilegeToken 2 IoCs
Processes:
2024-04-27_896821e90f6bf918c326d86cf0ae2fba_bkransomware.exeCTS.exedescription pid process Token: SeDebugPrivilege 2872 2024-04-27_896821e90f6bf918c326d86cf0ae2fba_bkransomware.exe Token: SeDebugPrivilege 2956 CTS.exe -
Suspicious use of WriteProcessMemory 8 IoCs
Processes:
2024-04-27_896821e90f6bf918c326d86cf0ae2fba_bkransomware.exedescription pid process target process PID 2872 wrote to memory of 2924 2872 2024-04-27_896821e90f6bf918c326d86cf0ae2fba_bkransomware.exe HcSEKtLStuV3HBB.exe PID 2872 wrote to memory of 2924 2872 2024-04-27_896821e90f6bf918c326d86cf0ae2fba_bkransomware.exe HcSEKtLStuV3HBB.exe PID 2872 wrote to memory of 2924 2872 2024-04-27_896821e90f6bf918c326d86cf0ae2fba_bkransomware.exe HcSEKtLStuV3HBB.exe PID 2872 wrote to memory of 2924 2872 2024-04-27_896821e90f6bf918c326d86cf0ae2fba_bkransomware.exe HcSEKtLStuV3HBB.exe PID 2872 wrote to memory of 2956 2872 2024-04-27_896821e90f6bf918c326d86cf0ae2fba_bkransomware.exe CTS.exe PID 2872 wrote to memory of 2956 2872 2024-04-27_896821e90f6bf918c326d86cf0ae2fba_bkransomware.exe CTS.exe PID 2872 wrote to memory of 2956 2872 2024-04-27_896821e90f6bf918c326d86cf0ae2fba_bkransomware.exe CTS.exe PID 2872 wrote to memory of 2956 2872 2024-04-27_896821e90f6bf918c326d86cf0ae2fba_bkransomware.exe CTS.exe
Processes
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C:\Users\Admin\AppData\Local\Temp\2024-04-27_896821e90f6bf918c326d86cf0ae2fba_bkransomware.exe"C:\Users\Admin\AppData\Local\Temp\2024-04-27_896821e90f6bf918c326d86cf0ae2fba_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
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C:\Users\Admin\AppData\Local\Temp\HcSEKtLStuV3HBB.exeC:\Users\Admin\AppData\Local\Temp\HcSEKtLStuV3HBB.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\Temp\HcSEKtLStuV3HBB.exeFilesize
96KB
MD51ecb47a9bc07dd2cefa1870400ecc863
SHA14202ad4fec4c597d9c244abf2378471d965013a3
SHA256677f4b02cdab88110800be39a3dba047c39ced4639b129937cdd34e5152df2b5
SHA512a8d6c2383c1996c2da477508a04ca25d509d452f3eb71f1199caef8eb7781673456a1ab00d90429fcb794525dd1a4228289a9d45bf4f85b67befb4e5baee6aaa
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C:\Windows\CTS.exeFilesize
71KB
MD566df4ffab62e674af2e75b163563fc0b
SHA1dec8a197312e41eeb3cfef01cb2a443f0205cd6e
SHA256075a6eecd8da1795532318f9cf880efe42461f9464d63f74deb271d33110f163
SHA5121588dd78e6e8972013c40cdb6acfb84c8df7b081197233ce621904b645356c805d0424bb93dd46c55834dc47d9ff39ee1323cf8e670841b3fff24ab98ba87f25
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\Users\Admin\AppData\Local\Temp\HcSEKtLStuV3HBB.exeFilesize
25KB
MD5abbd49c180a2f8703f6306d6fa731fdc
SHA1d63f4bfe7f74936b2fbace803e3da6103fbf6586
SHA2565f411c0bd9ed9a42b0f07ed568c7d0cf358a83063b225a1f8f7da3296dde90f1
SHA512290dd984acc451b778f3db8c510bae7aec1d9547c3ad0a1829df731c136e4ecc9a37dc6a786cf8f1ecc4d14339aed1288af25055f450f6f953138c8d4d5c36e9
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memory/2924-15-0x0000000000400000-0x000000000040D000-memory.dmpFilesize
52KB