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Analysis
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max time kernel
150s -
max time network
150s -
platform
windows10-2004_x64 -
resource
win10v2004-20240508-en -
resource tags
arch:x64arch:x86image:win10v2004-20240508-enlocale:en-usos:windows10-2004-x64system -
submitted
20/05/2024, 06:35
Behavioral task
behavioral1
Sample
2024-05-20_4f2f7c79ad5317e16f18d2bde3ee64bf_cryptolocker.exe
Resource
win7-20240221-en
Behavioral task
behavioral2
Sample
2024-05-20_4f2f7c79ad5317e16f18d2bde3ee64bf_cryptolocker.exe
Resource
win10v2004-20240508-en
General
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Target
2024-05-20_4f2f7c79ad5317e16f18d2bde3ee64bf_cryptolocker.exe
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Size
52KB
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MD5
4f2f7c79ad5317e16f18d2bde3ee64bf
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SHA1
53178e6f019b4d0d38b92cc2ce33ee7394dbc5a0
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SHA256
fa1cb6e51aef9557496cd1cdfd43dc0f414dd356f68cb45788e49d4de0ed5245
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SHA512
59e2dce81dbc81d3f115298f4dc3cb05163d6b5e5d4bc62d45d41beef676688dee408174c161fddc348bd32f087af791caeb3970383ddca7b712beaad44a84be
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SSDEEP
768:bODOw9UiamWUB2preAr+OfjH/0S16avdrQFiLjJvtOO:bODOw9acifAoc+vB
Malware Config
Signatures
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Detection of CryptoLocker Variants 5 IoCs
resource yara_rule behavioral2/memory/4388-0-0x0000000008000000-0x000000000800F000-memory.dmp CryptoLocker_rule2 behavioral2/files/0x0008000000022f51-13.dat CryptoLocker_rule2 behavioral2/memory/3904-17-0x0000000008000000-0x000000000800F000-memory.dmp CryptoLocker_rule2 behavioral2/memory/4388-18-0x0000000008000000-0x000000000800F000-memory.dmp CryptoLocker_rule2 behavioral2/memory/3904-27-0x0000000008000000-0x000000000800F000-memory.dmp CryptoLocker_rule2 -
UPX dump on OEP (original entry point) 5 IoCs
resource yara_rule behavioral2/memory/4388-0-0x0000000008000000-0x000000000800F000-memory.dmp UPX behavioral2/files/0x0008000000022f51-13.dat UPX behavioral2/memory/3904-17-0x0000000008000000-0x000000000800F000-memory.dmp UPX behavioral2/memory/4388-18-0x0000000008000000-0x000000000800F000-memory.dmp UPX behavioral2/memory/3904-27-0x0000000008000000-0x000000000800F000-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-1-5-21-1337824034-2731376981-3755436523-1000\Control Panel\International\Geo\Nation 2024-05-20_4f2f7c79ad5317e16f18d2bde3ee64bf_cryptolocker.exe -
Executes dropped EXE 1 IoCs
pid Process 3904 lossy.exe -
resource yara_rule behavioral2/memory/4388-0-0x0000000008000000-0x000000000800F000-memory.dmp upx behavioral2/files/0x0008000000022f51-13.dat upx behavioral2/memory/3904-17-0x0000000008000000-0x000000000800F000-memory.dmp upx behavioral2/memory/4388-18-0x0000000008000000-0x000000000800F000-memory.dmp upx behavioral2/memory/3904-27-0x0000000008000000-0x000000000800F000-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 4388 wrote to memory of 3904 4388 2024-05-20_4f2f7c79ad5317e16f18d2bde3ee64bf_cryptolocker.exe 84 PID 4388 wrote to memory of 3904 4388 2024-05-20_4f2f7c79ad5317e16f18d2bde3ee64bf_cryptolocker.exe 84 PID 4388 wrote to memory of 3904 4388 2024-05-20_4f2f7c79ad5317e16f18d2bde3ee64bf_cryptolocker.exe 84
Processes
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C:\Users\Admin\AppData\Local\Temp\2024-05-20_4f2f7c79ad5317e16f18d2bde3ee64bf_cryptolocker.exe"C:\Users\Admin\AppData\Local\Temp\2024-05-20_4f2f7c79ad5317e16f18d2bde3ee64bf_cryptolocker.exe"1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:4388 -
C:\Users\Admin\AppData\Local\Temp\lossy.exe"C:\Users\Admin\AppData\Local\Temp\lossy.exe"2⤵
- Executes dropped EXE
PID:3904
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Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
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Filesize
52KB
MD50caa521bd794e19e0f935571661c62db
SHA14d9b34fd0e0df5a01d0067c3185bb31db4c709e7
SHA2560181b70b1538e988ea1969ae7c6f3b4fb8c4002fa3ff60ba6a9dad412b56a96c
SHA512d8c2cc2e7d325ba3d9acd4f3d495490ee31b44e06d37ada6cf1df2aac72db28d2d7c1d1681e0f591d480a64f3771e8e6f591ec5e86a882e855d2a43a62e68358