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Analysis
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max time kernel
148s -
max time network
150s -
platform
windows10-2004_x64 -
resource
win10v2004-20240802-en -
resource tags
arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system -
submitted
02/09/2024, 23:54
Behavioral task
behavioral1
Sample
2024-09-02_b5ea1df9ac47e25fa837e56be0cdf577_cryptolocker.exe
Resource
win7-20240705-en
General
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Target
2024-09-02_b5ea1df9ac47e25fa837e56be0cdf577_cryptolocker.exe
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Size
39KB
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MD5
b5ea1df9ac47e25fa837e56be0cdf577
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SHA1
6811bedb0dc808e0fb255b338bd1a2c3d5123973
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SHA256
ec95a562c9000808f82ec4b93d3aee40ce1f30dc74d8f28b6bfbd801301b7c06
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SHA512
7fc93eb994eba297e5bcf4bffdd6365d8fe01569142521651371d98cb499281ea5b133b910ab445bc20bdcddf1f5dd6b6017e2e1fc34e0d61ba61c41eaa352b6
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SSDEEP
768:q7PdFecFS5agQtOOtEvwDpjeMLZdzuqpXsiE8Wq/DpkITi:qDdFJy3QMOtEvwDpjjWMl7Ti
Malware Config
Signatures
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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-1-5-21-2170637797-568393320-3232933035-1000\Control Panel\International\Geo\Nation 2024-09-02_b5ea1df9ac47e25fa837e56be0cdf577_cryptolocker.exe -
Executes dropped EXE 1 IoCs
pid Process 3844 asih.exe -
resource yara_rule behavioral2/memory/4664-0-0x0000000000500000-0x0000000000510000-memory.dmp upx behavioral2/files/0x000900000002362a-13.dat upx behavioral2/memory/4664-18-0x0000000000500000-0x0000000000510000-memory.dmp upx behavioral2/memory/3844-27-0x0000000000500000-0x0000000000510000-memory.dmp upx -
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
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System Location Discovery: System Language Discovery 1 TTPs 2 IoCs
Attempt gather information about the system language of a victim in order to infer the geographical location of that host.
description ioc Process Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language 2024-09-02_b5ea1df9ac47e25fa837e56be0cdf577_cryptolocker.exe Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language asih.exe -
Suspicious use of WriteProcessMemory 3 IoCs
description pid Process procid_target PID 4664 wrote to memory of 3844 4664 2024-09-02_b5ea1df9ac47e25fa837e56be0cdf577_cryptolocker.exe 91 PID 4664 wrote to memory of 3844 4664 2024-09-02_b5ea1df9ac47e25fa837e56be0cdf577_cryptolocker.exe 91 PID 4664 wrote to memory of 3844 4664 2024-09-02_b5ea1df9ac47e25fa837e56be0cdf577_cryptolocker.exe 91
Processes
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C:\Users\Admin\AppData\Local\Temp\2024-09-02_b5ea1df9ac47e25fa837e56be0cdf577_cryptolocker.exe"C:\Users\Admin\AppData\Local\Temp\2024-09-02_b5ea1df9ac47e25fa837e56be0cdf577_cryptolocker.exe"1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4664 -
C:\Users\Admin\AppData\Local\Temp\asih.exe"C:\Users\Admin\AppData\Local\Temp\asih.exe"2⤵
- Executes dropped EXE
- System Location Discovery: System Language Discovery
PID:3844
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C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe"C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --field-trial-handle=4128,i,16316361669272684588,6171287487746154806,262144 --variations-seed-version --mojo-platform-channel-handle=4076 /prefetch:81⤵PID:876
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
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Filesize
39KB
MD5f6ef1d5202e8ff7f8eb48761fa0fec43
SHA18bbb1b98432d94579c5365e8ffe0f21729663234
SHA256a7f498a2da13b4b3b60c470fa2e1d04c73d1dd3f88ddbfd4f3824737e8068d73
SHA51253a1659eb0b7b9f147476a45c43a7b4344933614347c745489be4844c28fadceb946013438c498b790f19c3079f61e6f55a5cefc6bc89c54e750924a41202048