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Analysis
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max time kernel
145s -
max time network
153s -
platform
windows10-2004_x64 -
resource
win10v2004-20240226-en -
resource tags
arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system -
submitted
26/04/2024, 04:44
Static task
static1
Behavioral task
behavioral1
Sample
2024-04-26_635a4b7a6522727705bc276265093af1_cryptolocker.exe
Resource
win7-20240221-en
Behavioral task
behavioral2
Sample
2024-04-26_635a4b7a6522727705bc276265093af1_cryptolocker.exe
Resource
win10v2004-20240226-en
General
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Target
2024-04-26_635a4b7a6522727705bc276265093af1_cryptolocker.exe
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Size
48KB
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MD5
635a4b7a6522727705bc276265093af1
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SHA1
40fc9e87e5eb3780eff14325426a7c02c0484719
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SHA256
264c74e0a84130f9990cd5f794fb323f630f2f761d87dc510d22e79203f37da7
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SHA512
3c4ceced6c5de789c9277f360298d38e0fe161e863fe2b6dcccafeed4352857a0eb1f92dfe52d42aa4b3a054737b4ba2f60380b00fa45cb31752ec07cb5570fe
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SSDEEP
768:qmOKYQDf5XdrDmjr5tOOtEvwDpjAajFEitQbDmoSQCVUBJUkQqAHBIG05W2Mo2pK:qmbhXDmjr5MOtEvwDpj5cDtKkQZQ7
Malware Config
Signatures
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Detection of CryptoLocker Variants 5 IoCs
resource yara_rule behavioral2/memory/4028-0-0x0000000000500000-0x0000000000510000-memory.dmp CryptoLocker_rule2 behavioral2/files/0x000900000002325f-13.dat CryptoLocker_rule2 behavioral2/memory/4196-17-0x0000000000500000-0x0000000000510000-memory.dmp CryptoLocker_rule2 behavioral2/memory/4028-21-0x0000000000500000-0x0000000000510000-memory.dmp CryptoLocker_rule2 behavioral2/memory/4196-27-0x0000000000500000-0x0000000000510000-memory.dmp CryptoLocker_rule2 -
Detection of Cryptolocker Samples 2 IoCs
resource yara_rule behavioral2/memory/4028-21-0x0000000000500000-0x0000000000510000-memory.dmp CryptoLocker_set1 behavioral2/memory/4196-27-0x0000000000500000-0x0000000000510000-memory.dmp CryptoLocker_set1 -
UPX dump on OEP (original entry point) 5 IoCs
resource yara_rule behavioral2/memory/4028-0-0x0000000000500000-0x0000000000510000-memory.dmp UPX behavioral2/files/0x000900000002325f-13.dat UPX behavioral2/memory/4196-17-0x0000000000500000-0x0000000000510000-memory.dmp UPX behavioral2/memory/4028-21-0x0000000000500000-0x0000000000510000-memory.dmp UPX behavioral2/memory/4196-27-0x0000000000500000-0x0000000000510000-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 2024-04-26_635a4b7a6522727705bc276265093af1_cryptolocker.exe -
Executes dropped EXE 1 IoCs
pid Process 4196 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 4028 wrote to memory of 4196 4028 2024-04-26_635a4b7a6522727705bc276265093af1_cryptolocker.exe 91 PID 4028 wrote to memory of 4196 4028 2024-04-26_635a4b7a6522727705bc276265093af1_cryptolocker.exe 91 PID 4028 wrote to memory of 4196 4028 2024-04-26_635a4b7a6522727705bc276265093af1_cryptolocker.exe 91
Processes
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C:\Users\Admin\AppData\Local\Temp\2024-04-26_635a4b7a6522727705bc276265093af1_cryptolocker.exe"C:\Users\Admin\AppData\Local\Temp\2024-04-26_635a4b7a6522727705bc276265093af1_cryptolocker.exe"1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:4028 -
C:\Users\Admin\AppData\Local\Temp\asih.exe"C:\Users\Admin\AppData\Local\Temp\asih.exe"2⤵
- Executes dropped EXE
PID:4196
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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=3996 --field-trial-handle=3084,i,4016110471176367543,14287608422419064331,262144 --variations-seed-version /prefetch:81⤵PID:1272
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
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Filesize
48KB
MD50235785a191deb10e28272770a75aaa1
SHA1298bd71d52edcbafda19aa526e45eb7f0d089875
SHA2568a381ed729e8a79483160f5c66b60fe775ae772b9cbd9667a4ca8034c21f4bf2
SHA5126acdee5a80795fef83e93e29a6ea7dcea384aba37ad21a312fb2d6ddc232cb50ddc4e3993b645b141aa781217d96df46c81086e50d3804646893573bb76c7f7e