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Analysis
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max time kernel
150s -
max time network
155s -
platform
windows10-2004_x64 -
resource
win10v2004-20231215-en -
resource tags
arch:x64arch:x86image:win10v2004-20231215-enlocale:en-usos:windows10-2004-x64system -
submitted
18/02/2024, 23:40
Behavioral task
behavioral1
Sample
2024-02-18_cd95b43a12b11efd4fcac11f0530d3c8_cryptolocker.exe
Resource
win7-20231215-en
Behavioral task
behavioral2
Sample
2024-02-18_cd95b43a12b11efd4fcac11f0530d3c8_cryptolocker.exe
Resource
win10v2004-20231215-en
General
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Target
2024-02-18_cd95b43a12b11efd4fcac11f0530d3c8_cryptolocker.exe
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Size
117KB
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MD5
cd95b43a12b11efd4fcac11f0530d3c8
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SHA1
47fce96c2786c38c6e9d480f00d8612b14da4205
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SHA256
1d1fc11f1cfca0dd4221cc40f9d3097cf65a62877e42fa8e7ce9462c8e68730b
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SHA512
f3ded4ebcc985ade01866cb02983571c3b1ac047ae54d39a528ebe9612024da98515a2ad1c2c25f517cbe83ba06427a8d35faef98fb18151f1da1d9c050008f4
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SSDEEP
1536:z6QFElP6n+gKmddpMOtEvwDpj3GYQbN/PKwNgp01W:z6a+CdOOtEvwDpjczI
Malware Config
Signatures
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Detection of CryptoLocker Variants 5 IoCs
resource yara_rule behavioral2/memory/4136-0-0x0000000000500000-0x0000000000510000-memory.dmp CryptoLocker_rule2 behavioral2/files/0x0007000000023224-13.dat CryptoLocker_rule2 behavioral2/memory/4136-17-0x0000000000500000-0x0000000000510000-memory.dmp CryptoLocker_rule2 behavioral2/memory/4328-18-0x0000000000500000-0x0000000000510000-memory.dmp CryptoLocker_rule2 behavioral2/memory/4328-27-0x0000000000500000-0x0000000000510000-memory.dmp CryptoLocker_rule2 -
Detection of Cryptolocker Samples 5 IoCs
resource yara_rule behavioral2/memory/4136-0-0x0000000000500000-0x0000000000510000-memory.dmp CryptoLocker_set1 behavioral2/files/0x0007000000023224-13.dat CryptoLocker_set1 behavioral2/memory/4136-17-0x0000000000500000-0x0000000000510000-memory.dmp CryptoLocker_set1 behavioral2/memory/4328-18-0x0000000000500000-0x0000000000510000-memory.dmp CryptoLocker_set1 behavioral2/memory/4328-27-0x0000000000500000-0x0000000000510000-memory.dmp CryptoLocker_set1 -
UPX dump on OEP (original entry point) 5 IoCs
resource yara_rule behavioral2/memory/4136-0-0x0000000000500000-0x0000000000510000-memory.dmp UPX behavioral2/files/0x0007000000023224-13.dat UPX behavioral2/memory/4136-17-0x0000000000500000-0x0000000000510000-memory.dmp UPX behavioral2/memory/4328-18-0x0000000000500000-0x0000000000510000-memory.dmp UPX behavioral2/memory/4328-27-0x0000000000500000-0x0000000000510000-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-1-5-21-1815711207-1844170477-3539718864-1000\Control Panel\International\Geo\Nation 2024-02-18_cd95b43a12b11efd4fcac11f0530d3c8_cryptolocker.exe -
Executes dropped EXE 1 IoCs
pid Process 4328 asih.exe -
resource yara_rule behavioral2/memory/4136-0-0x0000000000500000-0x0000000000510000-memory.dmp upx behavioral2/files/0x0007000000023224-13.dat upx behavioral2/memory/4136-17-0x0000000000500000-0x0000000000510000-memory.dmp upx behavioral2/memory/4328-18-0x0000000000500000-0x0000000000510000-memory.dmp upx behavioral2/memory/4328-27-0x0000000000500000-0x0000000000510000-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 4136 wrote to memory of 4328 4136 2024-02-18_cd95b43a12b11efd4fcac11f0530d3c8_cryptolocker.exe 84 PID 4136 wrote to memory of 4328 4136 2024-02-18_cd95b43a12b11efd4fcac11f0530d3c8_cryptolocker.exe 84 PID 4136 wrote to memory of 4328 4136 2024-02-18_cd95b43a12b11efd4fcac11f0530d3c8_cryptolocker.exe 84
Processes
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C:\Users\Admin\AppData\Local\Temp\2024-02-18_cd95b43a12b11efd4fcac11f0530d3c8_cryptolocker.exe"C:\Users\Admin\AppData\Local\Temp\2024-02-18_cd95b43a12b11efd4fcac11f0530d3c8_cryptolocker.exe"1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:4136 -
C:\Users\Admin\AppData\Local\Temp\asih.exe"C:\Users\Admin\AppData\Local\Temp\asih.exe"2⤵
- Executes dropped EXE
PID:4328
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Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
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Filesize
117KB
MD52a928b6e764bbb0297db26d4f90dc380
SHA129d6b5a09541f32192a2b46cf061876fbe9e1b6b
SHA256d7177afaaad2c950cee0acd10c08582c23a0ed70bc76f95424aee934b2934581
SHA512c4cb1d99eba64cf8afc4919ecd2186b82ea85526f186cf4a5549b0f8ce0e8e5de246578ce0e243e374f958c298126e2cd3efd6d397a061f223b34eca82053e1b