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Analysis
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max time kernel
149s -
max time network
151s -
platform
windows10-2004_x64 -
resource
win10v2004-20240226-en -
resource tags
arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system -
submitted
04/04/2024, 22:26
Behavioral task
behavioral1
Sample
2024-04-04_545c3e1b346ce636a00e86c7af209e0f_cryptolocker.exe
Resource
win7-20240221-en
Behavioral task
behavioral2
Sample
2024-04-04_545c3e1b346ce636a00e86c7af209e0f_cryptolocker.exe
Resource
win10v2004-20240226-en
General
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Target
2024-04-04_545c3e1b346ce636a00e86c7af209e0f_cryptolocker.exe
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Size
109KB
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MD5
545c3e1b346ce636a00e86c7af209e0f
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SHA1
c8a3135d4e64a568e17b14049bfcacedb53e85fb
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SHA256
5bfa6c8d1ee0f2137dbaef9d2c9df17a088aaf7abc3efa4ef077df418b0579c6
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SHA512
3585c7ba43db3591eb2492a0c6ceef561ba15018bea2c5b9c918d29c83bf2a919bb6c186e3f3af71aa9345c3acb1f3bb6a6c0712dd46fc96957e92223e8b749a
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SSDEEP
1536:P8mnK6QFElP6n+gymddpMOtEvwDpjIHsalRn5iF1j6GkszfD:1nK6a+qdOOtEvwDpjX
Malware Config
Signatures
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Detection of CryptoLocker Variants 5 IoCs
resource yara_rule behavioral2/memory/3992-0-0x0000000000500000-0x000000000050F311-memory.dmp CryptoLocker_rule2 behavioral2/files/0x00080000000231fc-13.dat CryptoLocker_rule2 behavioral2/memory/1320-17-0x0000000000500000-0x000000000050F311-memory.dmp CryptoLocker_rule2 behavioral2/memory/3992-19-0x0000000000500000-0x000000000050F311-memory.dmp CryptoLocker_rule2 behavioral2/memory/1320-27-0x0000000000500000-0x000000000050F311-memory.dmp CryptoLocker_rule2 -
Detection of Cryptolocker Samples 5 IoCs
resource yara_rule behavioral2/memory/3992-0-0x0000000000500000-0x000000000050F311-memory.dmp CryptoLocker_set1 behavioral2/files/0x00080000000231fc-13.dat CryptoLocker_set1 behavioral2/memory/1320-17-0x0000000000500000-0x000000000050F311-memory.dmp CryptoLocker_set1 behavioral2/memory/3992-19-0x0000000000500000-0x000000000050F311-memory.dmp CryptoLocker_set1 behavioral2/memory/1320-27-0x0000000000500000-0x000000000050F311-memory.dmp CryptoLocker_set1 -
UPX dump on OEP (original entry point) 5 IoCs
resource yara_rule behavioral2/memory/3992-0-0x0000000000500000-0x000000000050F311-memory.dmp UPX behavioral2/files/0x00080000000231fc-13.dat UPX behavioral2/memory/1320-17-0x0000000000500000-0x000000000050F311-memory.dmp UPX behavioral2/memory/3992-19-0x0000000000500000-0x000000000050F311-memory.dmp UPX behavioral2/memory/1320-27-0x0000000000500000-0x000000000050F311-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-1-5-21-983155329-280873152-1838004294-1000\Control Panel\International\Geo\Nation 2024-04-04_545c3e1b346ce636a00e86c7af209e0f_cryptolocker.exe -
Executes dropped EXE 1 IoCs
pid Process 1320 asih.exe -
resource yara_rule behavioral2/memory/3992-0-0x0000000000500000-0x000000000050F311-memory.dmp upx behavioral2/files/0x00080000000231fc-13.dat upx behavioral2/memory/1320-17-0x0000000000500000-0x000000000050F311-memory.dmp upx behavioral2/memory/3992-19-0x0000000000500000-0x000000000050F311-memory.dmp upx behavioral2/memory/1320-27-0x0000000000500000-0x000000000050F311-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 3992 wrote to memory of 1320 3992 2024-04-04_545c3e1b346ce636a00e86c7af209e0f_cryptolocker.exe 87 PID 3992 wrote to memory of 1320 3992 2024-04-04_545c3e1b346ce636a00e86c7af209e0f_cryptolocker.exe 87 PID 3992 wrote to memory of 1320 3992 2024-04-04_545c3e1b346ce636a00e86c7af209e0f_cryptolocker.exe 87
Processes
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C:\Users\Admin\AppData\Local\Temp\2024-04-04_545c3e1b346ce636a00e86c7af209e0f_cryptolocker.exe"C:\Users\Admin\AppData\Local\Temp\2024-04-04_545c3e1b346ce636a00e86c7af209e0f_cryptolocker.exe"1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:3992 -
C:\Users\Admin\AppData\Local\Temp\asih.exe"C:\Users\Admin\AppData\Local\Temp\asih.exe"2⤵
- Executes dropped EXE
PID:1320
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Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
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Filesize
109KB
MD518f7164c670735fba3eb7a1ec91297b3
SHA1cb14062748f4662ef85d3f1e91eb0702f62d8047
SHA256da8eeba016ae3d9d9b1807057476006d7c62371fa6ae3d378cfa8f3d426e894e
SHA51256e94481b38aac81b408a2f9910299452b09313f01713449cb7bcccceca0381d5d4ebc337e4a2fef7c9b95aa950235968710eb5121f267972379dce8f2637ae5