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Analysis
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max time kernel
148s -
max time network
153s -
platform
windows10-2004_x64 -
resource
win10v2004-20240226-en -
resource tags
arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system -
submitted
27/03/2024, 03:33
Behavioral task
behavioral1
Sample
2024-03-27_317c31ad1532979f648bcf95563f94d9_cryptolocker.exe
Resource
win7-20240221-en
Behavioral task
behavioral2
Sample
2024-03-27_317c31ad1532979f648bcf95563f94d9_cryptolocker.exe
Resource
win10v2004-20240226-en
General
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Target
2024-03-27_317c31ad1532979f648bcf95563f94d9_cryptolocker.exe
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Size
35KB
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MD5
317c31ad1532979f648bcf95563f94d9
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SHA1
601c7ef6193224e255dbba5a22ce5961d764e82a
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SHA256
41925d8861b11afa9a145b324da96b1afa779e2f242bfe2fb01cdef598051f63
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SHA512
4b244b95453ab9430ddb656617abe0c1edf03de093472cfb7bdf62792d8e99fd31bd4fee97e413114fb6373a6dcd8762810e42e8aadd0619d01214aca1e7518a
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SSDEEP
768:q7PdFecFS5agQtOOtEvwDpjeMLZdzuqpXsiE8Wq/DpkITL:qDdFJy3QMOtEvwDpjjWMl7TL
Malware Config
Signatures
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Detection of CryptoLocker Variants 5 IoCs
resource yara_rule behavioral2/memory/4344-0-0x0000000000500000-0x0000000000510000-memory.dmp CryptoLocker_rule2 behavioral2/files/0x0007000000023238-13.dat CryptoLocker_rule2 behavioral2/memory/4648-17-0x0000000000500000-0x0000000000510000-memory.dmp CryptoLocker_rule2 behavioral2/memory/4344-18-0x0000000000500000-0x0000000000510000-memory.dmp CryptoLocker_rule2 behavioral2/memory/4648-27-0x0000000000500000-0x0000000000510000-memory.dmp CryptoLocker_rule2 -
Detection of Cryptolocker Samples 5 IoCs
resource yara_rule behavioral2/memory/4344-0-0x0000000000500000-0x0000000000510000-memory.dmp CryptoLocker_set1 behavioral2/files/0x0007000000023238-13.dat CryptoLocker_set1 behavioral2/memory/4648-17-0x0000000000500000-0x0000000000510000-memory.dmp CryptoLocker_set1 behavioral2/memory/4344-18-0x0000000000500000-0x0000000000510000-memory.dmp CryptoLocker_set1 behavioral2/memory/4648-27-0x0000000000500000-0x0000000000510000-memory.dmp CryptoLocker_set1 -
UPX dump on OEP (original entry point) 5 IoCs
resource yara_rule behavioral2/memory/4344-0-0x0000000000500000-0x0000000000510000-memory.dmp UPX behavioral2/files/0x0007000000023238-13.dat UPX behavioral2/memory/4648-17-0x0000000000500000-0x0000000000510000-memory.dmp UPX behavioral2/memory/4344-18-0x0000000000500000-0x0000000000510000-memory.dmp UPX behavioral2/memory/4648-27-0x0000000000500000-0x0000000000510000-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-1-5-21-557049126-2506969350-2798870634-1000\Control Panel\International\Geo\Nation 2024-03-27_317c31ad1532979f648bcf95563f94d9_cryptolocker.exe -
Executes dropped EXE 1 IoCs
pid Process 4648 asih.exe -
resource yara_rule behavioral2/memory/4344-0-0x0000000000500000-0x0000000000510000-memory.dmp upx behavioral2/files/0x0007000000023238-13.dat upx behavioral2/memory/4648-17-0x0000000000500000-0x0000000000510000-memory.dmp upx behavioral2/memory/4344-18-0x0000000000500000-0x0000000000510000-memory.dmp upx behavioral2/memory/4648-27-0x0000000000500000-0x0000000000510000-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
description pid Process procid_target PID 4344 wrote to memory of 4648 4344 2024-03-27_317c31ad1532979f648bcf95563f94d9_cryptolocker.exe 91 PID 4344 wrote to memory of 4648 4344 2024-03-27_317c31ad1532979f648bcf95563f94d9_cryptolocker.exe 91 PID 4344 wrote to memory of 4648 4344 2024-03-27_317c31ad1532979f648bcf95563f94d9_cryptolocker.exe 91
Processes
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C:\Users\Admin\AppData\Local\Temp\2024-03-27_317c31ad1532979f648bcf95563f94d9_cryptolocker.exe"C:\Users\Admin\AppData\Local\Temp\2024-03-27_317c31ad1532979f648bcf95563f94d9_cryptolocker.exe"1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:4344 -
C:\Users\Admin\AppData\Local\Temp\asih.exe"C:\Users\Admin\AppData\Local\Temp\asih.exe"2⤵
- Executes dropped EXE
PID:4648
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Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
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Filesize
35KB
MD5523f2aa4638e8b3039c786eecdb48f55
SHA1e7d059d437ba9a0f62e32e4fbb998a73a55eab8c
SHA2563f4e921aa88b9999eb229f7a68ad0077b57aba10dec3e089d22c5b6950e59a5b
SHA51216bff0f12d47ee35b96674ecdae80003c3724fc4060687d3f08e9772ef1ba6059359e18c5ede56741af1a23b234a433818f5388a924dc8439f5bb93cdf6195da