Analysis
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max time kernel
154s -
max time network
160s -
platform
windows10-2004_x64 -
resource
win10v2004-20240226-en -
resource tags
arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system -
submitted
06/03/2024, 11:45
Static task
static1
Behavioral task
behavioral1
Sample
2024-03-06_f85b4e0852d49ee05cfe0444c2a4b6b4_cryptolocker.exe
Resource
win7-20240221-en
Behavioral task
behavioral2
Sample
2024-03-06_f85b4e0852d49ee05cfe0444c2a4b6b4_cryptolocker.exe
Resource
win10v2004-20240226-en
General
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Target
2024-03-06_f85b4e0852d49ee05cfe0444c2a4b6b4_cryptolocker.exe
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Size
32KB
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MD5
f85b4e0852d49ee05cfe0444c2a4b6b4
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SHA1
398852885cc04c95e7fece27a926805a5bb62e4f
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SHA256
b32c801c72cb86959a6e241efb712bb49446acb8cf691c1799e5c80f46b58f55
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SHA512
572c70ef2d276b3420dbd3b91886ca4f9f57c24ba318827aa83bf482debe90694fbe006dd899240f8a644d03dcec435629515a4f61b83db774a74c57478bbfdc
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SSDEEP
768:q0ZziOWwULueOSdE8tOOtEvwDpjeWaJIOc+4tHmNg9:q0zizzOSxMOtEvwDpj/arqcQ
Malware Config
Signatures
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Detection of CryptoLocker Variants 4 IoCs
resource yara_rule behavioral2/memory/780-0-0x0000000000500000-0x0000000000510000-memory.dmp CryptoLocker_rule2 behavioral2/files/0x000f000000023253-13.dat CryptoLocker_rule2 behavioral2/memory/780-25-0x0000000000500000-0x0000000000510000-memory.dmp CryptoLocker_rule2 behavioral2/memory/3112-26-0x0000000000500000-0x0000000000510000-memory.dmp CryptoLocker_rule2 -
Detection of Cryptolocker Samples 2 IoCs
resource yara_rule behavioral2/memory/780-25-0x0000000000500000-0x0000000000510000-memory.dmp CryptoLocker_set1 behavioral2/memory/3112-26-0x0000000000500000-0x0000000000510000-memory.dmp CryptoLocker_set1 -
UPX dump on OEP (original entry point) 4 IoCs
resource yara_rule behavioral2/memory/780-0-0x0000000000500000-0x0000000000510000-memory.dmp UPX behavioral2/files/0x000f000000023253-13.dat UPX behavioral2/memory/780-25-0x0000000000500000-0x0000000000510000-memory.dmp UPX behavioral2/memory/3112-26-0x0000000000500000-0x0000000000510000-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 2024-03-06_f85b4e0852d49ee05cfe0444c2a4b6b4_cryptolocker.exe -
Executes dropped EXE 1 IoCs
pid Process 3112 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 780 wrote to memory of 3112 780 2024-03-06_f85b4e0852d49ee05cfe0444c2a4b6b4_cryptolocker.exe 95 PID 780 wrote to memory of 3112 780 2024-03-06_f85b4e0852d49ee05cfe0444c2a4b6b4_cryptolocker.exe 95 PID 780 wrote to memory of 3112 780 2024-03-06_f85b4e0852d49ee05cfe0444c2a4b6b4_cryptolocker.exe 95
Processes
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C:\Users\Admin\AppData\Local\Temp\2024-03-06_f85b4e0852d49ee05cfe0444c2a4b6b4_cryptolocker.exe"C:\Users\Admin\AppData\Local\Temp\2024-03-06_f85b4e0852d49ee05cfe0444c2a4b6b4_cryptolocker.exe"1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:780 -
C:\Users\Admin\AppData\Local\Temp\asih.exe"C:\Users\Admin\AppData\Local\Temp\asih.exe"2⤵
- Executes dropped EXE
PID:3112
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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=1416 --field-trial-handle=3088,i,14310325015283915034,7660943942870463106,262144 --variations-seed-version /prefetch:81⤵PID:452
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
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Filesize
32KB
MD5e232addf26aa70e6d5649518069484f4
SHA194e03d3cb8da7703e160b4bb4debab3c03e5c312
SHA2568c74ae9b4e6e29dc74985d2cdb18d69f9a4cab1b9d3dea90e2b4b7af6d379936
SHA5120291d7e0972f8c7add419b3e3fa74f6f61ad6573ae755983e324da13b2f0af6831dd22c0abd522c506b9146bbcce5151839f6fcb920e79a9ac3371b87ee99a35