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Analysis
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max time kernel
148s -
max time network
152s -
platform
windows10-2004_x64 -
resource
win10v2004-20231215-en -
resource tags
arch:x64arch:x86image:win10v2004-20231215-enlocale:en-usos:windows10-2004-x64system -
submitted
19/01/2024, 12:33
Behavioral task
behavioral1
Sample
2024-01-19_355e4c6bac32489cbc1dca656b82e1f1_cryptolocker.exe
Resource
win7-20231129-en
Behavioral task
behavioral2
Sample
2024-01-19_355e4c6bac32489cbc1dca656b82e1f1_cryptolocker.exe
Resource
win10v2004-20231215-en
General
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Target
2024-01-19_355e4c6bac32489cbc1dca656b82e1f1_cryptolocker.exe
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Size
62KB
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MD5
355e4c6bac32489cbc1dca656b82e1f1
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SHA1
a3da1d6df46099e8cb625a220e8a526adee39bfa
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SHA256
76d0eae94a7a89a8cbfc50121b639a2c5dacc2d92db9ef8e1e01d334e938c207
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SHA512
6425bbf0783ba8a4780ac8dc0b1f1555c5b9f0bf9ea63a3a997c96a8e6336b7960dea430d6ad7ff0eb0984fb5c11dc650c0cb41c3cc4acf5ca356ddcdd07816d
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SSDEEP
1536:P8mnK6QFElP6n+gymddpMOtEvwDpjY6U2:1nK6a+qdOOtEvwDpjH
Malware Config
Signatures
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Detection of CryptoLocker Variants 4 IoCs
resource yara_rule behavioral2/memory/4432-0-0x0000000000500000-0x000000000050F311-memory.dmp CryptoLocker_rule2 behavioral2/files/0x000c000000023164-13.dat CryptoLocker_rule2 behavioral2/memory/4432-17-0x0000000000500000-0x000000000050F311-memory.dmp CryptoLocker_rule2 behavioral2/memory/2876-26-0x0000000000500000-0x000000000050F311-memory.dmp CryptoLocker_rule2 -
Detection of Cryptolocker Samples 4 IoCs
resource yara_rule behavioral2/memory/4432-0-0x0000000000500000-0x000000000050F311-memory.dmp CryptoLocker_set1 behavioral2/files/0x000c000000023164-13.dat CryptoLocker_set1 behavioral2/memory/4432-17-0x0000000000500000-0x000000000050F311-memory.dmp CryptoLocker_set1 behavioral2/memory/2876-26-0x0000000000500000-0x000000000050F311-memory.dmp CryptoLocker_set1 -
UPX dump on OEP (original entry point) 4 IoCs
resource yara_rule behavioral2/memory/4432-0-0x0000000000500000-0x000000000050F311-memory.dmp UPX behavioral2/files/0x000c000000023164-13.dat UPX behavioral2/memory/4432-17-0x0000000000500000-0x000000000050F311-memory.dmp UPX behavioral2/memory/2876-26-0x0000000000500000-0x000000000050F311-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-1-5-21-3791175113-1062217823-1177695025-1000\Control Panel\International\Geo\Nation 2024-01-19_355e4c6bac32489cbc1dca656b82e1f1_cryptolocker.exe -
Executes dropped EXE 1 IoCs
pid Process 2876 asih.exe -
resource yara_rule behavioral2/memory/4432-0-0x0000000000500000-0x000000000050F311-memory.dmp upx behavioral2/files/0x000c000000023164-13.dat upx behavioral2/memory/4432-17-0x0000000000500000-0x000000000050F311-memory.dmp upx behavioral2/memory/2876-26-0x0000000000500000-0x000000000050F311-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 4432 wrote to memory of 2876 4432 2024-01-19_355e4c6bac32489cbc1dca656b82e1f1_cryptolocker.exe 88 PID 4432 wrote to memory of 2876 4432 2024-01-19_355e4c6bac32489cbc1dca656b82e1f1_cryptolocker.exe 88 PID 4432 wrote to memory of 2876 4432 2024-01-19_355e4c6bac32489cbc1dca656b82e1f1_cryptolocker.exe 88
Processes
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C:\Users\Admin\AppData\Local\Temp\2024-01-19_355e4c6bac32489cbc1dca656b82e1f1_cryptolocker.exe"C:\Users\Admin\AppData\Local\Temp\2024-01-19_355e4c6bac32489cbc1dca656b82e1f1_cryptolocker.exe"1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:4432 -
C:\Users\Admin\AppData\Local\Temp\asih.exe"C:\Users\Admin\AppData\Local\Temp\asih.exe"2⤵
- Executes dropped EXE
PID:2876
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Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
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Filesize
62KB
MD5be4eaf0c35cb4a19bd5eb8c89248cb3e
SHA1106527bfc4faade9b716ea3e6e5653220f980872
SHA2566d4fddd483267e6424c6da3a7b88b430e0a8e09dcbb3994dfe425a132fa29fb2
SHA5125f35523535b8a0b22f8b8b8661a0efbb5888782f7e53aa1704ece5e7d16be612d3827e8ca0fc982c0b6cbe0a3fbe8496cc7afeb9a3a0ae9f435ed1edf89783ee