Analysis
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max time kernel
148s -
max time network
151s -
platform
windows10-2004_x64 -
resource
win10v2004-20231222-en -
resource tags
arch:x64arch:x86image:win10v2004-20231222-enlocale:en-usos:windows10-2004-x64system -
submitted
25-01-2024 17:28
Behavioral task
behavioral1
Sample
2024-01-25_59796b548d643ef5532ecd1138966f74_cryptolocker.exe
Resource
win7-20231215-en
General
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Target
2024-01-25_59796b548d643ef5532ecd1138966f74_cryptolocker.exe
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Size
115KB
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MD5
59796b548d643ef5532ecd1138966f74
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SHA1
bdb3d3c1c43109a53627514b73b15b585008d1a6
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SHA256
ac1e4a9ba6ee34f32645634e2f85aa362a95c522526ec64bca2bb1b7d8a750a2
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SHA512
b2630cc6025e1fdcc67e1698aff334184a209e3c13470fb08f9220d1999f1e50da6f3ff250b47aec7dc512107fcbe07e0a3b6ec8caeb95ddbc990c1a7a3c3f82
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SSDEEP
1536:z6QFElP6n+gKmddpMOtEvwDpj3GYQbN/PKwNgp01f:z6a+CdOOtEvwDpjczN
Malware Config
Signatures
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Detection of CryptoLocker Variants 5 IoCs
Processes:
resource yara_rule behavioral2/memory/3076-0-0x0000000000500000-0x0000000000510000-memory.dmp CryptoLocker_rule2 behavioral2/files/0x0007000000023226-13.dat CryptoLocker_rule2 behavioral2/memory/4320-17-0x0000000000500000-0x0000000000510000-memory.dmp CryptoLocker_rule2 behavioral2/memory/3076-18-0x0000000000500000-0x0000000000510000-memory.dmp CryptoLocker_rule2 behavioral2/memory/4320-27-0x0000000000500000-0x0000000000510000-memory.dmp CryptoLocker_rule2 -
Detection of Cryptolocker Samples 5 IoCs
Processes:
resource yara_rule behavioral2/memory/3076-0-0x0000000000500000-0x0000000000510000-memory.dmp CryptoLocker_set1 behavioral2/files/0x0007000000023226-13.dat CryptoLocker_set1 behavioral2/memory/4320-17-0x0000000000500000-0x0000000000510000-memory.dmp CryptoLocker_set1 behavioral2/memory/3076-18-0x0000000000500000-0x0000000000510000-memory.dmp CryptoLocker_set1 behavioral2/memory/4320-27-0x0000000000500000-0x0000000000510000-memory.dmp CryptoLocker_set1 -
UPX dump on OEP (original entry point) 5 IoCs
Processes:
resource yara_rule behavioral2/memory/3076-0-0x0000000000500000-0x0000000000510000-memory.dmp UPX behavioral2/files/0x0007000000023226-13.dat UPX behavioral2/memory/4320-17-0x0000000000500000-0x0000000000510000-memory.dmp UPX behavioral2/memory/3076-18-0x0000000000500000-0x0000000000510000-memory.dmp UPX behavioral2/memory/4320-27-0x0000000000500000-0x0000000000510000-memory.dmp UPX -
Checks computer location settings 2 TTPs 1 IoCs
Looks up country code configured in the registry, likely geofence.
Processes:
2024-01-25_59796b548d643ef5532ecd1138966f74_cryptolocker.exedescription ioc Process Key value queried \REGISTRY\USER\S-1-5-21-1168293393-3419776239-306423207-1000\Control Panel\International\Geo\Nation 2024-01-25_59796b548d643ef5532ecd1138966f74_cryptolocker.exe -
Executes dropped EXE 1 IoCs
Processes:
asih.exepid Process 4320 asih.exe -
Processes:
resource yara_rule behavioral2/memory/3076-0-0x0000000000500000-0x0000000000510000-memory.dmp upx behavioral2/files/0x0007000000023226-13.dat upx behavioral2/memory/4320-17-0x0000000000500000-0x0000000000510000-memory.dmp upx behavioral2/memory/3076-18-0x0000000000500000-0x0000000000510000-memory.dmp upx behavioral2/memory/4320-27-0x0000000000500000-0x0000000000510000-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
Processes:
2024-01-25_59796b548d643ef5532ecd1138966f74_cryptolocker.exedescription pid Process procid_target PID 3076 wrote to memory of 4320 3076 2024-01-25_59796b548d643ef5532ecd1138966f74_cryptolocker.exe 88 PID 3076 wrote to memory of 4320 3076 2024-01-25_59796b548d643ef5532ecd1138966f74_cryptolocker.exe 88 PID 3076 wrote to memory of 4320 3076 2024-01-25_59796b548d643ef5532ecd1138966f74_cryptolocker.exe 88
Processes
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C:\Users\Admin\AppData\Local\Temp\2024-01-25_59796b548d643ef5532ecd1138966f74_cryptolocker.exe"C:\Users\Admin\AppData\Local\Temp\2024-01-25_59796b548d643ef5532ecd1138966f74_cryptolocker.exe"1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:3076 -
C:\Users\Admin\AppData\Local\Temp\asih.exe"C:\Users\Admin\AppData\Local\Temp\asih.exe"2⤵
- Executes dropped EXE
PID:4320
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Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
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Filesize
115KB
MD59685c6b3c0d52e023521f4f42776c0f5
SHA19192a25a6b2f326850743a46475a72dad3f0d6c3
SHA256e806ff77d92cffdd4871f261a006d6aa4f3e69cfb3b794333e22ec8104d60d2e
SHA512e7657f18cf763e6be2b5e6985de253c028e0b7470b21c7f91054c8917b9bafe7457adcf9c32fb72ddb85f5e4ec1c9eebb7e46fb01e66a2f2b5b7677d13a51fe1