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Analysis
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max time kernel
141s -
max time network
157s -
platform
windows10-2004_x64 -
resource
win10v2004-20240226-en -
resource tags
arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system -
submitted
29/03/2024, 02:39
Static task
static1
Behavioral task
behavioral1
Sample
2024-03-29_2ab576b9b03cca762a9b8ccee2b29e9c_cryptolocker.exe
Resource
win7-20240215-en
Behavioral task
behavioral2
Sample
2024-03-29_2ab576b9b03cca762a9b8ccee2b29e9c_cryptolocker.exe
Resource
win10v2004-20240226-en
General
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Target
2024-03-29_2ab576b9b03cca762a9b8ccee2b29e9c_cryptolocker.exe
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Size
70KB
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MD5
2ab576b9b03cca762a9b8ccee2b29e9c
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SHA1
410794f3d7d80ef85ca4843106b8ed1c7cbf37cf
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SHA256
9fcbf62a1923bf992fd4e0faba0e81945fa8bfd0ff30b060a10c46be9a69dfe0
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SHA512
24c2cd9a40d9d61ff52d5b17f686dad634953c612da40ae0bdc289cbe3d7917e7ac42a60461d099bbcd99ace3a4b0f9700d64125f4a0cb8c375a8d42a1b5a664
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SSDEEP
1536:Dk/xY0sllyGQMOtEvwDpjwycDtKkQZQRKb61vSbgZ3QzNKUNZO7:DW60sllyWOtEvwDpjwF85c
Malware Config
Signatures
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Detection of CryptoLocker Variants 3 IoCs
resource yara_rule behavioral2/memory/4940-0-0x0000000000500000-0x000000000050B000-memory.dmp CryptoLocker_rule2 behavioral2/files/0x00030000000227e7-13.dat CryptoLocker_rule2 behavioral2/memory/4940-25-0x0000000000500000-0x000000000050B000-memory.dmp CryptoLocker_rule2 -
Detection of Cryptolocker Samples 3 IoCs
resource yara_rule behavioral2/memory/4940-0-0x0000000000500000-0x000000000050B000-memory.dmp CryptoLocker_set1 behavioral2/files/0x00030000000227e7-13.dat CryptoLocker_set1 behavioral2/memory/4940-25-0x0000000000500000-0x000000000050B000-memory.dmp CryptoLocker_set1 -
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 2024-03-29_2ab576b9b03cca762a9b8ccee2b29e9c_cryptolocker.exe -
Executes dropped EXE 1 IoCs
pid Process 4620 asih.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 4940 wrote to memory of 4620 4940 2024-03-29_2ab576b9b03cca762a9b8ccee2b29e9c_cryptolocker.exe 98 PID 4940 wrote to memory of 4620 4940 2024-03-29_2ab576b9b03cca762a9b8ccee2b29e9c_cryptolocker.exe 98 PID 4940 wrote to memory of 4620 4940 2024-03-29_2ab576b9b03cca762a9b8ccee2b29e9c_cryptolocker.exe 98
Processes
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C:\Users\Admin\AppData\Local\Temp\2024-03-29_2ab576b9b03cca762a9b8ccee2b29e9c_cryptolocker.exe"C:\Users\Admin\AppData\Local\Temp\2024-03-29_2ab576b9b03cca762a9b8ccee2b29e9c_cryptolocker.exe"1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:4940 -
C:\Users\Admin\AppData\Local\Temp\asih.exe"C:\Users\Admin\AppData\Local\Temp\asih.exe"2⤵
- Executes dropped EXE
PID:4620
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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=4004 --field-trial-handle=2280,i,716736634476467098,11449718822158202904,262144 --variations-seed-version /prefetch:81⤵PID:2256
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
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Filesize
71KB
MD55a845c4bf1e7efcc09a280d342a9db44
SHA142eb214080a52ea30c095dee7c215c1a5f1cf29e
SHA256599291f1d8997a9f8758b4343dd21f91c30f04248a36efbb68658c5dcb66d165
SHA51230f34723ad71c0cdcf0309c646de6682811d9fc2495c2eb6c058bde9af0ffaa99c52c5d7b0a12fd613a0035add7607112a886bffc1267bea5bc9f1580708ade4