Analysis
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max time kernel
119s -
max time network
120s -
platform
windows7_x64 -
resource
win7-20240508-en -
resource tags
arch:x64arch:x86image:win7-20240508-enlocale:en-usos:windows7-x64system -
submitted
21-05-2024 16:05
Static task
static1
Behavioral task
behavioral1
Sample
2024-05-21_ef846a72a62332fdedb7fec0375b6d7b_bkransomware.exe
Resource
win7-20240508-en
Behavioral task
behavioral2
Sample
2024-05-21_ef846a72a62332fdedb7fec0375b6d7b_bkransomware.exe
Resource
win10v2004-20240426-en
General
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Target
2024-05-21_ef846a72a62332fdedb7fec0375b6d7b_bkransomware.exe
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Size
96KB
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MD5
ef846a72a62332fdedb7fec0375b6d7b
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SHA1
1926eb7099c6bbdc50c03c97f1e71642ecc809bf
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SHA256
631b34d8ed91665e29597ee1d80ea29fd713a8d92c809ce29826bce969aa8027
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SHA512
936576e43959f1067575bf5cf458bcc70ad376dcb7550a49be7f26f75871bafda1d6018bd76a5b6d4bfdbd5529da7a3481d1ea5e93ea9bf1e9650bfe56135168
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SSDEEP
1536:Fc897UsWjcd9w+AyabjDbxE+MwmvlDuazTK3Qdu++54H0wg2:ZhpAyazIlyazTKghLHhg2
Malware Config
Signatures
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Executes dropped EXE 2 IoCs
Processes:
lPtfB6DvZHGBChr.exeCTS.exepid process 2656 lPtfB6DvZHGBChr.exe 3068 CTS.exe -
Loads dropped DLL 3 IoCs
Processes:
2024-05-21_ef846a72a62332fdedb7fec0375b6d7b_bkransomware.exepid process 2556 2024-05-21_ef846a72a62332fdedb7fec0375b6d7b_bkransomware.exe 2556 2024-05-21_ef846a72a62332fdedb7fec0375b6d7b_bkransomware.exe 2992 -
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:
2024-05-21_ef846a72a62332fdedb7fec0375b6d7b_bkransomware.exeCTS.exedescription ioc process Set value (str) \REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Run\CTS = "C:\\Windows\\CTS.exe" 2024-05-21_ef846a72a62332fdedb7fec0375b6d7b_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:
2024-05-21_ef846a72a62332fdedb7fec0375b6d7b_bkransomware.exeCTS.exedescription ioc process File created C:\Windows\CTS.exe 2024-05-21_ef846a72a62332fdedb7fec0375b6d7b_bkransomware.exe File created C:\Windows\CTS.exe CTS.exe -
Suspicious use of AdjustPrivilegeToken 2 IoCs
Processes:
2024-05-21_ef846a72a62332fdedb7fec0375b6d7b_bkransomware.exeCTS.exedescription pid process Token: SeDebugPrivilege 2556 2024-05-21_ef846a72a62332fdedb7fec0375b6d7b_bkransomware.exe Token: SeDebugPrivilege 3068 CTS.exe -
Suspicious use of WriteProcessMemory 8 IoCs
Processes:
2024-05-21_ef846a72a62332fdedb7fec0375b6d7b_bkransomware.exedescription pid process target process PID 2556 wrote to memory of 2656 2556 2024-05-21_ef846a72a62332fdedb7fec0375b6d7b_bkransomware.exe lPtfB6DvZHGBChr.exe PID 2556 wrote to memory of 2656 2556 2024-05-21_ef846a72a62332fdedb7fec0375b6d7b_bkransomware.exe lPtfB6DvZHGBChr.exe PID 2556 wrote to memory of 2656 2556 2024-05-21_ef846a72a62332fdedb7fec0375b6d7b_bkransomware.exe lPtfB6DvZHGBChr.exe PID 2556 wrote to memory of 2656 2556 2024-05-21_ef846a72a62332fdedb7fec0375b6d7b_bkransomware.exe lPtfB6DvZHGBChr.exe PID 2556 wrote to memory of 3068 2556 2024-05-21_ef846a72a62332fdedb7fec0375b6d7b_bkransomware.exe CTS.exe PID 2556 wrote to memory of 3068 2556 2024-05-21_ef846a72a62332fdedb7fec0375b6d7b_bkransomware.exe CTS.exe PID 2556 wrote to memory of 3068 2556 2024-05-21_ef846a72a62332fdedb7fec0375b6d7b_bkransomware.exe CTS.exe PID 2556 wrote to memory of 3068 2556 2024-05-21_ef846a72a62332fdedb7fec0375b6d7b_bkransomware.exe CTS.exe
Processes
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C:\Users\Admin\AppData\Local\Temp\2024-05-21_ef846a72a62332fdedb7fec0375b6d7b_bkransomware.exe"C:\Users\Admin\AppData\Local\Temp\2024-05-21_ef846a72a62332fdedb7fec0375b6d7b_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:2556 -
C:\Users\Admin\AppData\Local\Temp\lPtfB6DvZHGBChr.exeC:\Users\Admin\AppData\Local\Temp\lPtfB6DvZHGBChr.exe2⤵
- Executes dropped EXE
PID:2656 -
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:3068
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
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Filesize
96KB
MD546f5fd94f1ec2a81e05e94c43ca97759
SHA1ea770b26b9bac677b587597d2785e50f5334d26a
SHA256ac5e7c1e13afffc83ade6c139da8b237870f64fba213eb2f6fd12de886470c35
SHA512a0a642f0aa787bba65f73ee6d192e08432ee5581552dc4243e1d0a948dc69a413adcd7a1aa0aa24635357cdc002565b876a1a941568242ded5747ad7538670e3
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Filesize
25KB
MD5abbd49c180a2f8703f6306d6fa731fdc
SHA1d63f4bfe7f74936b2fbace803e3da6103fbf6586
SHA2565f411c0bd9ed9a42b0f07ed568c7d0cf358a83063b225a1f8f7da3296dde90f1
SHA512290dd984acc451b778f3db8c510bae7aec1d9547c3ad0a1829df731c136e4ecc9a37dc6a786cf8f1ecc4d14339aed1288af25055f450f6f953138c8d4d5c36e9
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Filesize
71KB
MD566df4ffab62e674af2e75b163563fc0b
SHA1dec8a197312e41eeb3cfef01cb2a443f0205cd6e
SHA256075a6eecd8da1795532318f9cf880efe42461f9464d63f74deb271d33110f163
SHA5121588dd78e6e8972013c40cdb6acfb84c8df7b081197233ce621904b645356c805d0424bb93dd46c55834dc47d9ff39ee1323cf8e670841b3fff24ab98ba87f25