Analysis
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max time kernel
147s -
max time network
150s -
platform
windows10-2004_x64 -
resource
win10v2004-20240426-en -
resource tags
arch:x64arch:x86image:win10v2004-20240426-enlocale:en-usos:windows10-2004-x64system -
submitted
22-05-2024 02:23
Behavioral task
behavioral1
Sample
2024-05-22_139e09bbab09f11bd56e551a1e6ac599_cryptolocker.exe
Resource
win7-20240221-en
Behavioral task
behavioral2
Sample
2024-05-22_139e09bbab09f11bd56e551a1e6ac599_cryptolocker.exe
Resource
win10v2004-20240426-en
General
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Target
2024-05-22_139e09bbab09f11bd56e551a1e6ac599_cryptolocker.exe
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Size
77KB
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MD5
139e09bbab09f11bd56e551a1e6ac599
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SHA1
8999c0c53e3d7a0915b7e031634b451257e3e077
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SHA256
8c6e239bfa6d8194543097f37ae0ebe8ef36179d856ab5d952294325c6537175
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SHA512
f2905ebffb9c5c876d825280fa9efdd221e73c751064b2dfabe4138bb17943fb543032ca2b8f62bb8c51a8b1be26f1bc45d0dde74058983a9438de6a0efefb4d
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SSDEEP
1536:T6QFElP6n+gxmddpMOtEvwDpjwaxTNUOAkXtBdxPUxB1i:T6a+rdOOtEvwDpjNtHPF
Malware Config
Signatures
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Detection of CryptoLocker Variants 5 IoCs
Processes:
resource yara_rule behavioral2/memory/3800-0-0x0000000000500000-0x0000000000510000-memory.dmp CryptoLocker_rule2 C:\Users\Admin\AppData\Local\Temp\asih.exe CryptoLocker_rule2 behavioral2/memory/4128-16-0x0000000000500000-0x0000000000510000-memory.dmp CryptoLocker_rule2 behavioral2/memory/3800-18-0x0000000000500000-0x0000000000510000-memory.dmp CryptoLocker_rule2 behavioral2/memory/4128-27-0x0000000000500000-0x0000000000510000-memory.dmp CryptoLocker_rule2 -
Detection of Cryptolocker Samples 5 IoCs
Processes:
resource yara_rule behavioral2/memory/3800-0-0x0000000000500000-0x0000000000510000-memory.dmp CryptoLocker_set1 C:\Users\Admin\AppData\Local\Temp\asih.exe CryptoLocker_set1 behavioral2/memory/4128-16-0x0000000000500000-0x0000000000510000-memory.dmp CryptoLocker_set1 behavioral2/memory/3800-18-0x0000000000500000-0x0000000000510000-memory.dmp CryptoLocker_set1 behavioral2/memory/4128-27-0x0000000000500000-0x0000000000510000-memory.dmp CryptoLocker_set1 -
UPX dump on OEP (original entry point) 5 IoCs
Processes:
resource yara_rule behavioral2/memory/3800-0-0x0000000000500000-0x0000000000510000-memory.dmp UPX C:\Users\Admin\AppData\Local\Temp\asih.exe UPX behavioral2/memory/4128-16-0x0000000000500000-0x0000000000510000-memory.dmp UPX behavioral2/memory/3800-18-0x0000000000500000-0x0000000000510000-memory.dmp UPX behavioral2/memory/4128-27-0x0000000000500000-0x0000000000510000-memory.dmp UPX -
Checks computer location settings 2 TTPs 1 IoCs
Looks up country code configured in the registry, likely geofence.
Processes:
2024-05-22_139e09bbab09f11bd56e551a1e6ac599_cryptolocker.exedescription ioc process Key value queried \REGISTRY\USER\S-1-5-21-4018855536-2201274732-320770143-1000\Control Panel\International\Geo\Nation 2024-05-22_139e09bbab09f11bd56e551a1e6ac599_cryptolocker.exe -
Executes dropped EXE 1 IoCs
Processes:
asih.exepid process 4128 asih.exe -
Processes:
resource yara_rule behavioral2/memory/3800-0-0x0000000000500000-0x0000000000510000-memory.dmp upx C:\Users\Admin\AppData\Local\Temp\asih.exe upx behavioral2/memory/4128-16-0x0000000000500000-0x0000000000510000-memory.dmp upx behavioral2/memory/3800-18-0x0000000000500000-0x0000000000510000-memory.dmp upx behavioral2/memory/4128-27-0x0000000000500000-0x0000000000510000-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:
2024-05-22_139e09bbab09f11bd56e551a1e6ac599_cryptolocker.exedescription pid process target process PID 3800 wrote to memory of 4128 3800 2024-05-22_139e09bbab09f11bd56e551a1e6ac599_cryptolocker.exe asih.exe PID 3800 wrote to memory of 4128 3800 2024-05-22_139e09bbab09f11bd56e551a1e6ac599_cryptolocker.exe asih.exe PID 3800 wrote to memory of 4128 3800 2024-05-22_139e09bbab09f11bd56e551a1e6ac599_cryptolocker.exe asih.exe
Processes
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C:\Users\Admin\AppData\Local\Temp\2024-05-22_139e09bbab09f11bd56e551a1e6ac599_cryptolocker.exe"C:\Users\Admin\AppData\Local\Temp\2024-05-22_139e09bbab09f11bd56e551a1e6ac599_cryptolocker.exe"1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Local\Temp\asih.exe"C:\Users\Admin\AppData\Local\Temp\asih.exe"2⤵
- Executes dropped EXE
Network
MITRE ATT&CK Matrix ATT&CK v13
Replay Monitor
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Downloads
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C:\Users\Admin\AppData\Local\Temp\asih.exeFilesize
77KB
MD5efb625814055c9465fe4cf195293e8ae
SHA1b64519e2ad5a8c662d80bda243d01a4c514d09fe
SHA25680b0e74ca438df8585adebe225121c29abf32c28f5735d9c05b6ba24484ae059
SHA5125b8893d719dac660aaf614644ccc7c2d182e9d04dc2080cb09b22eaa78dd7c541a43e928dc1c452f635677f8bf5154b4397fe54960deb45497465f101f2ed09b
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memory/3800-0-0x0000000000500000-0x0000000000510000-memory.dmpFilesize
64KB
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memory/3800-1-0x00000000020D0000-0x00000000020D6000-memory.dmpFilesize
24KB
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memory/3800-2-0x00000000020F0000-0x00000000020F6000-memory.dmpFilesize
24KB
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memory/3800-9-0x00000000020D0000-0x00000000020D6000-memory.dmpFilesize
24KB
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memory/3800-18-0x0000000000500000-0x0000000000510000-memory.dmpFilesize
64KB
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memory/4128-16-0x0000000000500000-0x0000000000510000-memory.dmpFilesize
64KB
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memory/4128-20-0x0000000000650000-0x0000000000656000-memory.dmpFilesize
24KB
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memory/4128-26-0x0000000000620000-0x0000000000626000-memory.dmpFilesize
24KB
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memory/4128-27-0x0000000000500000-0x0000000000510000-memory.dmpFilesize
64KB