Analysis
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max time kernel
148s -
max time network
150s -
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 15:56
Behavioral task
behavioral1
Sample
2024-01-25_f99d0c28e52597958c35ecd0ec00f55a_cryptolocker.exe
Resource
win7-20231215-en
General
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Target
2024-01-25_f99d0c28e52597958c35ecd0ec00f55a_cryptolocker.exe
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Size
75KB
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MD5
f99d0c28e52597958c35ecd0ec00f55a
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SHA1
d61f6c25c65acea065a6d2f88dc83e16384177da
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SHA256
f68a0aa7625616b0e5d55f92dd68c55a7527289e2d2f1c8998a62b91281e6755
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SHA512
e8ccfdfd8dbe02e82408ea760ecc61f3d6eb100b101ab0c0bca5585ca95702e6ff6de1d1703d7c98c7f990a1051d7b56278e14dc0830dd2d53dc482e4ac78149
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SSDEEP
1536:T6QFElP6n+gxmddpMOtEvwDpjwaxTNUOAkXtBde:T6a+rdOOtEvwDpjNtE
Malware Config
Signatures
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Detection of CryptoLocker Variants 4 IoCs
Processes:
resource yara_rule behavioral2/memory/224-0-0x0000000000500000-0x0000000000510000-memory.dmp CryptoLocker_rule2 C:\Users\Admin\AppData\Local\Temp\asih.exe CryptoLocker_rule2 behavioral2/memory/224-17-0x0000000000500000-0x0000000000510000-memory.dmp CryptoLocker_rule2 behavioral2/memory/4212-26-0x0000000000500000-0x0000000000510000-memory.dmp CryptoLocker_rule2 -
Detection of Cryptolocker Samples 4 IoCs
Processes:
resource yara_rule behavioral2/memory/224-0-0x0000000000500000-0x0000000000510000-memory.dmp CryptoLocker_set1 C:\Users\Admin\AppData\Local\Temp\asih.exe CryptoLocker_set1 behavioral2/memory/224-17-0x0000000000500000-0x0000000000510000-memory.dmp CryptoLocker_set1 behavioral2/memory/4212-26-0x0000000000500000-0x0000000000510000-memory.dmp CryptoLocker_set1 -
UPX dump on OEP (original entry point) 4 IoCs
Processes:
resource yara_rule behavioral2/memory/224-0-0x0000000000500000-0x0000000000510000-memory.dmp UPX C:\Users\Admin\AppData\Local\Temp\asih.exe UPX behavioral2/memory/224-17-0x0000000000500000-0x0000000000510000-memory.dmp UPX behavioral2/memory/4212-26-0x0000000000500000-0x0000000000510000-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_f99d0c28e52597958c35ecd0ec00f55a_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_f99d0c28e52597958c35ecd0ec00f55a_cryptolocker.exe -
Executes dropped EXE 1 IoCs
Processes:
asih.exepid process 4212 asih.exe -
Processes:
resource yara_rule behavioral2/memory/224-0-0x0000000000500000-0x0000000000510000-memory.dmp upx C:\Users\Admin\AppData\Local\Temp\asih.exe upx behavioral2/memory/224-17-0x0000000000500000-0x0000000000510000-memory.dmp upx behavioral2/memory/4212-26-0x0000000000500000-0x0000000000510000-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_f99d0c28e52597958c35ecd0ec00f55a_cryptolocker.exedescription pid process target process PID 224 wrote to memory of 4212 224 2024-01-25_f99d0c28e52597958c35ecd0ec00f55a_cryptolocker.exe asih.exe PID 224 wrote to memory of 4212 224 2024-01-25_f99d0c28e52597958c35ecd0ec00f55a_cryptolocker.exe asih.exe PID 224 wrote to memory of 4212 224 2024-01-25_f99d0c28e52597958c35ecd0ec00f55a_cryptolocker.exe asih.exe
Processes
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C:\Users\Admin\AppData\Local\Temp\2024-01-25_f99d0c28e52597958c35ecd0ec00f55a_cryptolocker.exe"C:\Users\Admin\AppData\Local\Temp\2024-01-25_f99d0c28e52597958c35ecd0ec00f55a_cryptolocker.exe"1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:224 -
C:\Users\Admin\AppData\Local\Temp\asih.exe"C:\Users\Admin\AppData\Local\Temp\asih.exe"2⤵
- Executes dropped EXE
PID:4212
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
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C:\Users\Admin\AppData\Local\Temp\asih.exeFilesize
75KB
MD5dc76bcb3ea4800bfb06836f258658a65
SHA1158ad52eb5e57f969e042680fbb96ddf6111a2ac
SHA256fdc60d78ceadf189d986538af8340c561c512704d670628c48b9a82834bc9944
SHA512d222db3565e508beb8dcc8999210f7d2d989f734bdddd119301d7272b6ecf39505fcf7533600063f1239f8000ab16921fba7f9d79c3e9dac3df01c636d164b7e
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memory/224-0-0x0000000000500000-0x0000000000510000-memory.dmpFilesize
64KB
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memory/224-1-0x0000000000630000-0x0000000000636000-memory.dmpFilesize
24KB
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memory/224-2-0x0000000000630000-0x0000000000636000-memory.dmpFilesize
24KB
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memory/224-3-0x0000000002100000-0x0000000002106000-memory.dmpFilesize
24KB
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memory/224-17-0x0000000000500000-0x0000000000510000-memory.dmpFilesize
64KB
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memory/4212-19-0x0000000002070000-0x0000000002076000-memory.dmpFilesize
24KB
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memory/4212-20-0x0000000002050000-0x0000000002056000-memory.dmpFilesize
24KB
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memory/4212-26-0x0000000000500000-0x0000000000510000-memory.dmpFilesize
64KB