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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
21/02/2024, 14:02
Static task
static1
Behavioral task
behavioral1
Sample
2024-02-21_b88a28575a5076cadfe51fdc7bcb49a1_cryptolocker.exe
Resource
win7-20231215-en
Behavioral task
behavioral2
Sample
2024-02-21_b88a28575a5076cadfe51fdc7bcb49a1_cryptolocker.exe
Resource
win10v2004-20240221-en
General
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Target
2024-02-21_b88a28575a5076cadfe51fdc7bcb49a1_cryptolocker.exe
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Size
46KB
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MD5
b88a28575a5076cadfe51fdc7bcb49a1
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SHA1
a459854f46b6017135caffdd89285828fd435e33
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SHA256
fb815dc3d683c7d3e0dc92a8b4738b473c2a680a074cb28797a00497dfe6c497
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SHA512
af62c7385c414ebc8b16160b29ac0da1d03eb8e1f4c1f76339a03f72781f7699dd1ca88b52bc08ebf9ab0f7cb732fee227ab5f33f5071653aa5e0b4c796952f2
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SSDEEP
768:qmOKYQDf5XdrDmjr5tOOtEvwDpjAajFEitQbDmoSQCVUBJUkQqAHBIG05W2Moo9i:qmbhXDmjr5MOtEvwDpj5cDtKkQZQS9xg
Malware Config
Signatures
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Detection of CryptoLocker Variants 4 IoCs
resource yara_rule behavioral2/memory/1436-0-0x0000000000500000-0x0000000000510000-memory.dmp CryptoLocker_rule2 behavioral2/files/0x00080000000231fa-13.dat CryptoLocker_rule2 behavioral2/memory/1436-16-0x0000000000500000-0x0000000000510000-memory.dmp CryptoLocker_rule2 behavioral2/memory/4784-26-0x0000000000500000-0x0000000000510000-memory.dmp CryptoLocker_rule2 -
Detection of Cryptolocker Samples 2 IoCs
resource yara_rule behavioral2/memory/1436-16-0x0000000000500000-0x0000000000510000-memory.dmp CryptoLocker_set1 behavioral2/memory/4784-26-0x0000000000500000-0x0000000000510000-memory.dmp CryptoLocker_set1 -
UPX dump on OEP (original entry point) 4 IoCs
resource yara_rule behavioral2/memory/1436-0-0x0000000000500000-0x0000000000510000-memory.dmp UPX behavioral2/files/0x00080000000231fa-13.dat UPX behavioral2/memory/1436-16-0x0000000000500000-0x0000000000510000-memory.dmp UPX behavioral2/memory/4784-26-0x0000000000500000-0x0000000000510000-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 2024-02-21_b88a28575a5076cadfe51fdc7bcb49a1_cryptolocker.exe -
Executes dropped EXE 1 IoCs
pid Process 4784 asih.exe -
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 1436 wrote to memory of 4784 1436 2024-02-21_b88a28575a5076cadfe51fdc7bcb49a1_cryptolocker.exe 86 PID 1436 wrote to memory of 4784 1436 2024-02-21_b88a28575a5076cadfe51fdc7bcb49a1_cryptolocker.exe 86 PID 1436 wrote to memory of 4784 1436 2024-02-21_b88a28575a5076cadfe51fdc7bcb49a1_cryptolocker.exe 86
Processes
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C:\Users\Admin\AppData\Local\Temp\2024-02-21_b88a28575a5076cadfe51fdc7bcb49a1_cryptolocker.exe"C:\Users\Admin\AppData\Local\Temp\2024-02-21_b88a28575a5076cadfe51fdc7bcb49a1_cryptolocker.exe"1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:1436 -
C:\Users\Admin\AppData\Local\Temp\asih.exe"C:\Users\Admin\AppData\Local\Temp\asih.exe"2⤵
- Executes dropped EXE
PID:4784
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Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
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Filesize
47KB
MD559eaa8a550e1cefd5788bb707d397e09
SHA14ecc34f51a36bf27b133d0f51933803f47fdfe61
SHA256bb8ff88f490cb5ad5fa9f95ec6f9d72a5da0d086971c14caea74806a7f9e06f2
SHA51212be4b077d460fee2032adce67f250e55c858a5bfaa029951945cf2246beb2f80a591700adb8814a6e668ad8535d6b4aa34a852524b0c797d82de29398215286