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Analysis
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max time kernel
150s -
max time network
155s -
platform
windows10-2004_x64 -
resource
win10v2004-20240226-en -
resource tags
arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system -
submitted
06/03/2024, 06:14
Behavioral task
behavioral1
Sample
2024-03-06_91db5df5ae4740ea83a2f14492e88dea_cryptolocker.exe
Resource
win7-20240221-en
Behavioral task
behavioral2
Sample
2024-03-06_91db5df5ae4740ea83a2f14492e88dea_cryptolocker.exe
Resource
win10v2004-20240226-en
General
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Target
2024-03-06_91db5df5ae4740ea83a2f14492e88dea_cryptolocker.exe
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Size
126KB
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MD5
91db5df5ae4740ea83a2f14492e88dea
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SHA1
ba7816ba8779e2bf6ad2e29429c8cf32e2f6ccf0
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SHA256
76fa8b190bd4ddfe746536a19398c2a1602e23ce246cc5a40c9d9b759c0a318e
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SHA512
f92fd06847d4d72664928b9020bd3ad7c85c3c8397f6a8fe12e8a44038c65e1001af01350791a73e398f1a79a8c8dbbff7eb31df3ccdad5d408e086274541eb9
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SSDEEP
1536:qkmnpomddpMOtEvwDpjJGYQbN/PKwNgp699GNtL1eIEm:AnBdOOtEvwDpj6zE
Malware Config
Signatures
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Detection of CryptoLocker Variants 4 IoCs
resource yara_rule behavioral2/memory/4948-0-0x0000000000500000-0x000000000050F000-memory.dmp CryptoLocker_rule2 behavioral2/files/0x0007000000023214-13.dat CryptoLocker_rule2 behavioral2/memory/4948-19-0x0000000000500000-0x000000000050F000-memory.dmp CryptoLocker_rule2 behavioral2/memory/3956-26-0x0000000000500000-0x000000000050F000-memory.dmp CryptoLocker_rule2 -
Detection of Cryptolocker Samples 4 IoCs
resource yara_rule behavioral2/memory/4948-0-0x0000000000500000-0x000000000050F000-memory.dmp CryptoLocker_set1 behavioral2/files/0x0007000000023214-13.dat CryptoLocker_set1 behavioral2/memory/4948-19-0x0000000000500000-0x000000000050F000-memory.dmp CryptoLocker_set1 behavioral2/memory/3956-26-0x0000000000500000-0x000000000050F000-memory.dmp CryptoLocker_set1 -
UPX dump on OEP (original entry point) 4 IoCs
resource yara_rule behavioral2/memory/4948-0-0x0000000000500000-0x000000000050F000-memory.dmp UPX behavioral2/files/0x0007000000023214-13.dat UPX behavioral2/memory/4948-19-0x0000000000500000-0x000000000050F000-memory.dmp UPX behavioral2/memory/3956-26-0x0000000000500000-0x000000000050F000-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-1-5-21-3045580317-3728985860-206385570-1000\Control Panel\International\Geo\Nation 2024-03-06_91db5df5ae4740ea83a2f14492e88dea_cryptolocker.exe -
Executes dropped EXE 1 IoCs
pid Process 3956 asih.exe -
resource yara_rule behavioral2/memory/4948-0-0x0000000000500000-0x000000000050F000-memory.dmp upx behavioral2/files/0x0007000000023214-13.dat upx behavioral2/memory/4948-19-0x0000000000500000-0x000000000050F000-memory.dmp upx behavioral2/memory/3956-26-0x0000000000500000-0x000000000050F000-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 4948 wrote to memory of 3956 4948 2024-03-06_91db5df5ae4740ea83a2f14492e88dea_cryptolocker.exe 90 PID 4948 wrote to memory of 3956 4948 2024-03-06_91db5df5ae4740ea83a2f14492e88dea_cryptolocker.exe 90 PID 4948 wrote to memory of 3956 4948 2024-03-06_91db5df5ae4740ea83a2f14492e88dea_cryptolocker.exe 90
Processes
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C:\Users\Admin\AppData\Local\Temp\2024-03-06_91db5df5ae4740ea83a2f14492e88dea_cryptolocker.exe"C:\Users\Admin\AppData\Local\Temp\2024-03-06_91db5df5ae4740ea83a2f14492e88dea_cryptolocker.exe"1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:4948 -
C:\Users\Admin\AppData\Local\Temp\asih.exe"C:\Users\Admin\AppData\Local\Temp\asih.exe"2⤵
- Executes dropped EXE
PID:3956
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Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
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Filesize
127KB
MD54900b3fe801b127142ae87048efed919
SHA18e504d37dffec35d4efc5caec5c7de53d836e75c
SHA2563c08906b441c8e356aab49de153591c33c2680cf8cc09957207154fe78707aef
SHA5128d0bab2d76ba8cc23ad9f4545b5d10e4cdd6c9da9612d86b2726770cfda9a7e25aca0ebd0ec2cf789e4bada22aa3954788a796db82ffdfded774bd0de3760d34