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Analysis
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max time kernel
150s -
max time network
155s -
platform
windows10-2004_x64 -
resource
win10v2004-20240221-en -
resource tags
arch:x64arch:x86image:win10v2004-20240221-enlocale:en-usos:windows10-2004-x64system -
submitted
24/02/2024, 04:44
Behavioral task
behavioral1
Sample
2024-02-24_5e39436a1d0b4cd15b18c0f0bff850d6_cryptolocker.exe
Resource
win7-20240221-en
Behavioral task
behavioral2
Sample
2024-02-24_5e39436a1d0b4cd15b18c0f0bff850d6_cryptolocker.exe
Resource
win10v2004-20240221-en
General
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Target
2024-02-24_5e39436a1d0b4cd15b18c0f0bff850d6_cryptolocker.exe
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Size
100KB
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MD5
5e39436a1d0b4cd15b18c0f0bff850d6
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SHA1
2ebf190f58732db492a765086d260f718e353a23
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SHA256
31e4bf5066891c87585c2f2bd739386b250933675cc2403458682e8f61e18530
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SHA512
c0b7b8b53331bc621e7ba608ff0fec6fe6efe1625618e36327b2b3912b00b95dd673f775e4a19dc607933560c6068417c3cfa3a594fa869ae501f8143b949a67
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SSDEEP
1536:qkmnpomddpMOtEvwDpjJGYQbN/PKwNgpwqWsviPeB+:AnBdOOtEvwDpj6zl
Malware Config
Signatures
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Detection of CryptoLocker Variants 5 IoCs
resource yara_rule behavioral2/memory/1844-0-0x0000000000500000-0x000000000050F000-memory.dmp CryptoLocker_rule2 behavioral2/files/0x000400000001e5ae-13.dat CryptoLocker_rule2 behavioral2/memory/1844-17-0x0000000000500000-0x000000000050F000-memory.dmp CryptoLocker_rule2 behavioral2/memory/4216-18-0x0000000000500000-0x000000000050F000-memory.dmp CryptoLocker_rule2 behavioral2/memory/4216-27-0x0000000000500000-0x000000000050F000-memory.dmp CryptoLocker_rule2 -
Detection of Cryptolocker Samples 5 IoCs
resource yara_rule behavioral2/memory/1844-0-0x0000000000500000-0x000000000050F000-memory.dmp CryptoLocker_set1 behavioral2/files/0x000400000001e5ae-13.dat CryptoLocker_set1 behavioral2/memory/1844-17-0x0000000000500000-0x000000000050F000-memory.dmp CryptoLocker_set1 behavioral2/memory/4216-18-0x0000000000500000-0x000000000050F000-memory.dmp CryptoLocker_set1 behavioral2/memory/4216-27-0x0000000000500000-0x000000000050F000-memory.dmp CryptoLocker_set1 -
UPX dump on OEP (original entry point) 5 IoCs
resource yara_rule behavioral2/memory/1844-0-0x0000000000500000-0x000000000050F000-memory.dmp UPX behavioral2/files/0x000400000001e5ae-13.dat UPX behavioral2/memory/1844-17-0x0000000000500000-0x000000000050F000-memory.dmp UPX behavioral2/memory/4216-18-0x0000000000500000-0x000000000050F000-memory.dmp UPX behavioral2/memory/4216-27-0x0000000000500000-0x000000000050F000-memory.dmp UPX -
Checks computer location settings 2 TTPs 1 IoCs
Looks up country code configured in the registry, likely geofence.
description ioc Process Key value queried \REGISTRY\USER\S-1-5-21-1414748551-1520717498-2956787782-1000\Control Panel\International\Geo\Nation 2024-02-24_5e39436a1d0b4cd15b18c0f0bff850d6_cryptolocker.exe -
Executes dropped EXE 1 IoCs
pid Process 4216 asih.exe -
resource yara_rule behavioral2/memory/1844-0-0x0000000000500000-0x000000000050F000-memory.dmp upx behavioral2/files/0x000400000001e5ae-13.dat upx behavioral2/memory/1844-17-0x0000000000500000-0x000000000050F000-memory.dmp upx behavioral2/memory/4216-18-0x0000000000500000-0x000000000050F000-memory.dmp upx behavioral2/memory/4216-27-0x0000000000500000-0x000000000050F000-memory.dmp upx -
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
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Suspicious use of WriteProcessMemory 3 IoCs
description pid Process procid_target PID 1844 wrote to memory of 4216 1844 2024-02-24_5e39436a1d0b4cd15b18c0f0bff850d6_cryptolocker.exe 87 PID 1844 wrote to memory of 4216 1844 2024-02-24_5e39436a1d0b4cd15b18c0f0bff850d6_cryptolocker.exe 87 PID 1844 wrote to memory of 4216 1844 2024-02-24_5e39436a1d0b4cd15b18c0f0bff850d6_cryptolocker.exe 87
Processes
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C:\Users\Admin\AppData\Local\Temp\2024-02-24_5e39436a1d0b4cd15b18c0f0bff850d6_cryptolocker.exe"C:\Users\Admin\AppData\Local\Temp\2024-02-24_5e39436a1d0b4cd15b18c0f0bff850d6_cryptolocker.exe"1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:1844 -
C:\Users\Admin\AppData\Local\Temp\asih.exe"C:\Users\Admin\AppData\Local\Temp\asih.exe"2⤵
- Executes dropped EXE
PID:4216
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Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
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Filesize
100KB
MD5f1c51187e72c89c8902b0b6321afdef5
SHA195473a8d29cb981620e7810e673510fda605ddc5
SHA2565ef1a0ccb250ed180b83a6d05e6b5132379ac700c241cbe575e2cf493219f7f2
SHA5126ba9f14d636c23f0ab61c01b73fbe88e9e1f547a14b161e50358abf1246366bfdf86b37d3f770cd8b57578cd185ca9ca3d6aa3729f7208cc72df4ab3881bfa45