Analysis
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max time kernel
88s -
max time network
149s -
platform
windows10-2004_x64 -
resource
win10v2004-20231215-en -
resource tags
arch:x64arch:x86image:win10v2004-20231215-enlocale:en-usos:windows10-2004-x64system -
submitted
20/02/2024, 14:56
Static task
static1
Behavioral task
behavioral1
Sample
2024-02-20_b1771fd91b44cc136d63a8d9cd4346b2_cryptolocker.exe
Resource
win7-20231129-en
Behavioral task
behavioral2
Sample
2024-02-20_b1771fd91b44cc136d63a8d9cd4346b2_cryptolocker.exe
Resource
win10v2004-20231215-en
General
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Target
2024-02-20_b1771fd91b44cc136d63a8d9cd4346b2_cryptolocker.exe
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Size
59KB
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MD5
b1771fd91b44cc136d63a8d9cd4346b2
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SHA1
f076b81d28be9bcabc7a0568841d9a3d254964c4
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SHA256
ab45b21802c92cd561e3dc246e26ca541eeb7adccb3804debb36a186713a87eb
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SHA512
fb8f228fdb064eb165a563c0e8f620f79f203b40621ec784388d59492bf489a6ed9ef790ff9209ea5fc5c516707b8ffca3d8c7259e4bd0a01bf38d46c8dfa00c
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SSDEEP
1536:btB9g/xtCSKfxLIc//Xr+/AO/kIZ3ft2nVuTKB6nggOlHdUHTdj:btng54SMLr+/AO/kIhfoKMHdU
Malware Config
Signatures
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Detection of CryptoLocker Variants 1 IoCs
resource yara_rule behavioral2/files/0x00070000000231fe-12.dat CryptoLocker_rule2 -
Checks computer location settings 2 TTPs 2 IoCs
Looks up country code configured in the registry, likely geofence.
description ioc Process Key value queried \REGISTRY\USER\S-1-5-21-768304381-2824894965-3840216961-1000\Control Panel\International\Geo\Nation 2024-02-20_b1771fd91b44cc136d63a8d9cd4346b2_cryptolocker.exe Key value queried \REGISTRY\USER\S-1-5-21-768304381-2824894965-3840216961-1000\Control Panel\International\Geo\Nation gewos.exe -
Executes dropped EXE 1 IoCs
pid Process 5112 gewos.exe -
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 2588 wrote to memory of 5112 2588 2024-02-20_b1771fd91b44cc136d63a8d9cd4346b2_cryptolocker.exe 85 PID 2588 wrote to memory of 5112 2588 2024-02-20_b1771fd91b44cc136d63a8d9cd4346b2_cryptolocker.exe 85 PID 2588 wrote to memory of 5112 2588 2024-02-20_b1771fd91b44cc136d63a8d9cd4346b2_cryptolocker.exe 85
Processes
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C:\Users\Admin\AppData\Local\Temp\2024-02-20_b1771fd91b44cc136d63a8d9cd4346b2_cryptolocker.exe"C:\Users\Admin\AppData\Local\Temp\2024-02-20_b1771fd91b44cc136d63a8d9cd4346b2_cryptolocker.exe"1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:2588 -
C:\Users\Admin\AppData\Local\Temp\gewos.exe"C:\Users\Admin\AppData\Local\Temp\gewos.exe"2⤵
- Checks computer location settings
- Executes dropped EXE
PID:5112
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Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
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Filesize
59KB
MD59e3b1692bcac999180e82d32e5a0e518
SHA13deb634cddd36f8b5fe2e290b1b871af187ad84c
SHA256de2a8cdb3dbc25724959adaf10df4cb525abea6fc3237dad3ba8f6d25e437591
SHA512e6e611b9def7fc278f6abaaa46da24e17454ac025a79c6a1a854c7dff935e12ee69d135e81f8cbd5324469bab25c0912fffdfb9bc6097cbb345423b107d8844d