Analysis
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max time kernel
120s -
max time network
122s -
platform
windows7_x64 -
resource
win7-20231129-en -
resource tags
arch:x64arch:x86image:win7-20231129-enlocale:en-usos:windows7-x64system -
submitted
26/05/2024, 11:44
Static task
static1
Behavioral task
behavioral1
Sample
2024-05-26_a6c2da62e1eafd6e088d165f122f27cb_bkransomware.exe
Resource
win7-20231129-en
Behavioral task
behavioral2
Sample
2024-05-26_a6c2da62e1eafd6e088d165f122f27cb_bkransomware.exe
Resource
win10v2004-20240426-en
General
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Target
2024-05-26_a6c2da62e1eafd6e088d165f122f27cb_bkransomware.exe
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Size
71KB
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MD5
a6c2da62e1eafd6e088d165f122f27cb
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SHA1
1af00e798010b9b999921c35153db81d0da023e0
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SHA256
06ae3631e881c3b0ca604e0aef7692206074bd1540146606632220ecdd828ab8
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SHA512
5a34e02921031d88e1c31eaa68032b5b968cabd04bbc2ca9fb3d78d219eb916a82bf7adf923f40927544cdcaae63fbd223db50e65e561acb048f856c59b30a75
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SSDEEP
1536:Fc8N7UsWjcd9w+AyabjDbxE+MwmvlzuazTo:ZRpAyazIliazTo
Malware Config
Signatures
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Executes dropped EXE 1 IoCs
pid Process 2208 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" CTS.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Run\CTS = "C:\\Windows\\CTS.exe" 2024-05-26_a6c2da62e1eafd6e088d165f122f27cb_bkransomware.exe -
Drops file in Windows directory 2 IoCs
description ioc Process File created C:\Windows\CTS.exe 2024-05-26_a6c2da62e1eafd6e088d165f122f27cb_bkransomware.exe File created C:\Windows\CTS.exe CTS.exe -
Suspicious use of AdjustPrivilegeToken 2 IoCs
description pid Process Token: SeDebugPrivilege 2356 2024-05-26_a6c2da62e1eafd6e088d165f122f27cb_bkransomware.exe Token: SeDebugPrivilege 2208 CTS.exe -
Suspicious use of WriteProcessMemory 4 IoCs
description pid Process procid_target PID 2356 wrote to memory of 2208 2356 2024-05-26_a6c2da62e1eafd6e088d165f122f27cb_bkransomware.exe 28 PID 2356 wrote to memory of 2208 2356 2024-05-26_a6c2da62e1eafd6e088d165f122f27cb_bkransomware.exe 28 PID 2356 wrote to memory of 2208 2356 2024-05-26_a6c2da62e1eafd6e088d165f122f27cb_bkransomware.exe 28 PID 2356 wrote to memory of 2208 2356 2024-05-26_a6c2da62e1eafd6e088d165f122f27cb_bkransomware.exe 28
Processes
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C:\Users\Admin\AppData\Local\Temp\2024-05-26_a6c2da62e1eafd6e088d165f122f27cb_bkransomware.exe"C:\Users\Admin\AppData\Local\Temp\2024-05-26_a6c2da62e1eafd6e088d165f122f27cb_bkransomware.exe"1⤵
- Adds Run key to start application
- Drops file in Windows directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2356 -
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:2208
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Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
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Filesize
425B
MD59a8a6b3f068281a44b8c70961bda9396
SHA14729589b244a7af9b5869e813b4457a22c291d31
SHA2560b4c7af99f41b6d1343a5cdb9d9d5d7413733432c1fa461fa0bd80cefc66f4f7
SHA512b71a1dc6e0b82a12f25aa8803105c8c3c77c6ea84c3f867905c91260cf292e40676be4c7325a992c65eff20f8f49c54e23616a8086a2efbe5b3cfa04594e76db
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Filesize
71KB
MD5f9d4ab0a726adc9b5e4b7d7b724912f1
SHA13d42ca2098475924f70ee4a831c4f003b4682328
SHA256b43be87e8586ca5e995979883468f3b3d9dc5212fbfd0b5f3341a5b7c56e0fbc
SHA51222a5f0e4b2716244e978ee50771823926f86baf0382ece48fd049f039cf77b5eb0691d83c61148903cff081fdbea969f47b8ed521647717f42bbed5c64552432