Analysis
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max time kernel
143s -
max time network
150s -
platform
windows10-2004_x64 -
resource
win10v2004-20231215-en -
resource tags
arch:x64arch:x86image:win10v2004-20231215-enlocale:en-usos:windows10-2004-x64system -
submitted
12-02-2024 17:58
Static task
static1
Behavioral task
behavioral1
Sample
2024-02-12_fc36e9e88367952970fb608509554bc7_cryptolocker.exe
Resource
win7-20231215-en
Behavioral task
behavioral2
Sample
2024-02-12_fc36e9e88367952970fb608509554bc7_cryptolocker.exe
Resource
win10v2004-20231215-en
General
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Target
2024-02-12_fc36e9e88367952970fb608509554bc7_cryptolocker.exe
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Size
41KB
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MD5
fc36e9e88367952970fb608509554bc7
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SHA1
752133455ddd13ae15669f0ab54b6032e10612ff
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SHA256
2aa0b5712950c4e31c9b991d869ccc427c994879f609e312dbc13804d37bf355
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SHA512
4fe859476c35feef2eb3f36584ae99e8a3b6bf421cd47e39f8d538230ff11f1009737a0aa7be85bdfe94e207ec03cde1e42371b1c33ae37a500a588bedb1dbc4
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SSDEEP
768:btB9g/WItCSsAGjX7r3BPOMHocM4vUUOmJ+7f:btB9g/xtCSKfxLIcMzUw7f
Malware Config
Signatures
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Detection of CryptoLocker Variants 1 IoCs
Processes:
resource yara_rule C:\Users\Admin\AppData\Local\Temp\gewos.exe CryptoLocker_rule2 -
Checks computer location settings 2 TTPs 2 IoCs
Looks up country code configured in the registry, likely geofence.
Processes:
2024-02-12_fc36e9e88367952970fb608509554bc7_cryptolocker.exegewos.exedescription ioc process Key value queried \REGISTRY\USER\S-1-5-21-2398549320-3657759451-817663969-1000\Control Panel\International\Geo\Nation 2024-02-12_fc36e9e88367952970fb608509554bc7_cryptolocker.exe Key value queried \REGISTRY\USER\S-1-5-21-2398549320-3657759451-817663969-1000\Control Panel\International\Geo\Nation gewos.exe -
Executes dropped EXE 1 IoCs
Processes:
gewos.exepid process 4616 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
Processes:
2024-02-12_fc36e9e88367952970fb608509554bc7_cryptolocker.exedescription pid process target process PID 5052 wrote to memory of 4616 5052 2024-02-12_fc36e9e88367952970fb608509554bc7_cryptolocker.exe gewos.exe PID 5052 wrote to memory of 4616 5052 2024-02-12_fc36e9e88367952970fb608509554bc7_cryptolocker.exe gewos.exe PID 5052 wrote to memory of 4616 5052 2024-02-12_fc36e9e88367952970fb608509554bc7_cryptolocker.exe gewos.exe
Processes
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C:\Users\Admin\AppData\Local\Temp\2024-02-12_fc36e9e88367952970fb608509554bc7_cryptolocker.exe"C:\Users\Admin\AppData\Local\Temp\2024-02-12_fc36e9e88367952970fb608509554bc7_cryptolocker.exe"1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:5052 -
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:4616
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
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Filesize
41KB
MD5479768f8578fea82165ea29dbb6983bc
SHA188b02429a78ae9478f70caf48dc8b362a8492cbf
SHA2567e866f8af4ba9ae30cb47f490dfe2d9ee345c58859a1bb80d26d39fcd1af2c0d
SHA512504767438d0fbeb184ab2529c1b2c34e444ee45f0c483990602f7da4946c8132d89487618da3fda0c884997f4fd49dce429cefb2d885836efc23b155a82993a0