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Analysis
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max time kernel
142s -
max time network
154s -
platform
windows10-2004_x64 -
resource
win10v2004-20240226-en -
resource tags
arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system -
submitted
08/03/2024, 05:38
Behavioral task
behavioral1
Sample
2024-03-08_33b81f5b19dc97db87af3be7fbc7eb16_cryptolocker.exe
Resource
win7-20231129-en
Behavioral task
behavioral2
Sample
2024-03-08_33b81f5b19dc97db87af3be7fbc7eb16_cryptolocker.exe
Resource
win10v2004-20240226-en
General
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Target
2024-03-08_33b81f5b19dc97db87af3be7fbc7eb16_cryptolocker.exe
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Size
57KB
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MD5
33b81f5b19dc97db87af3be7fbc7eb16
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SHA1
eacd0bd287994f60549a806eeaad835c6d76bbed
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SHA256
ac9beb13ac13282a57adc29bfbe36620ecfb98295fff31b0d497540059e74359
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SHA512
5df3ab00de99b851c56f68f00433fab736d979120713d5deb7b3f3fe0b9597162f3a5c8bf7812e03c6816b649367129d8a3609e2ff5c18146209747522026b5d
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SSDEEP
768:z6LsoEEeegiZPvEhHSG+gzum/kLyMro2GtOOtEvwDpj/YMLam5ax8ikfk:z6QFElP6n+gKmddpMOtEvwDpj9aYai8
Malware Config
Signatures
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Detection of CryptoLocker Variants 4 IoCs
resource yara_rule behavioral2/memory/3244-0-0x0000000000500000-0x0000000000510000-memory.dmp CryptoLocker_rule2 behavioral2/files/0x000400000002271f-13.dat CryptoLocker_rule2 behavioral2/memory/3244-25-0x0000000000500000-0x0000000000510000-memory.dmp CryptoLocker_rule2 behavioral2/memory/1612-26-0x0000000000500000-0x0000000000510000-memory.dmp CryptoLocker_rule2 -
Detection of Cryptolocker Samples 4 IoCs
resource yara_rule behavioral2/memory/3244-0-0x0000000000500000-0x0000000000510000-memory.dmp CryptoLocker_set1 behavioral2/files/0x000400000002271f-13.dat CryptoLocker_set1 behavioral2/memory/3244-25-0x0000000000500000-0x0000000000510000-memory.dmp CryptoLocker_set1 behavioral2/memory/1612-26-0x0000000000500000-0x0000000000510000-memory.dmp CryptoLocker_set1 -
UPX dump on OEP (original entry point) 4 IoCs
resource yara_rule behavioral2/memory/3244-0-0x0000000000500000-0x0000000000510000-memory.dmp UPX behavioral2/files/0x000400000002271f-13.dat UPX behavioral2/memory/3244-25-0x0000000000500000-0x0000000000510000-memory.dmp UPX behavioral2/memory/1612-26-0x0000000000500000-0x0000000000510000-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-1-5-21-3808065738-1666277613-1125846146-1000\Control Panel\International\Geo\Nation 2024-03-08_33b81f5b19dc97db87af3be7fbc7eb16_cryptolocker.exe -
Executes dropped EXE 1 IoCs
pid Process 1612 asih.exe -
resource yara_rule behavioral2/memory/3244-0-0x0000000000500000-0x0000000000510000-memory.dmp upx behavioral2/files/0x000400000002271f-13.dat upx behavioral2/memory/3244-25-0x0000000000500000-0x0000000000510000-memory.dmp upx behavioral2/memory/1612-26-0x0000000000500000-0x0000000000510000-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 3244 wrote to memory of 1612 3244 2024-03-08_33b81f5b19dc97db87af3be7fbc7eb16_cryptolocker.exe 97 PID 3244 wrote to memory of 1612 3244 2024-03-08_33b81f5b19dc97db87af3be7fbc7eb16_cryptolocker.exe 97 PID 3244 wrote to memory of 1612 3244 2024-03-08_33b81f5b19dc97db87af3be7fbc7eb16_cryptolocker.exe 97
Processes
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C:\Users\Admin\AppData\Local\Temp\2024-03-08_33b81f5b19dc97db87af3be7fbc7eb16_cryptolocker.exe"C:\Users\Admin\AppData\Local\Temp\2024-03-08_33b81f5b19dc97db87af3be7fbc7eb16_cryptolocker.exe"1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:3244 -
C:\Users\Admin\AppData\Local\Temp\asih.exe"C:\Users\Admin\AppData\Local\Temp\asih.exe"2⤵
- Executes dropped EXE
PID:1612
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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 --no-appcompat-clear --mojo-platform-channel-handle=4048 --field-trial-handle=3060,i,1774866140584649235,8085848018931772189,262144 --variations-seed-version /prefetch:81⤵PID:2452
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
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Filesize
57KB
MD5c41664ca06e7fa15637543385e6931c0
SHA160829e2e50c8485bcfe58f2c8db5ea7f6eb5d1d2
SHA256dcc615c2e1cc60df1a780a46871ef7968441757d761706820ae29b50127370d5
SHA512c6a7097bb382e2f7db57115b2f671e32290f274c100702f4cb2dab8df162d1602e3eceb63cda35acce1d90e7de1758f50bb4787caa4b77d56deee2fbdf6a77b4