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Analysis
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max time kernel
148s -
max time network
152s -
platform
windows10-2004_x64 -
resource
win10v2004-20240226-en -
resource tags
arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system -
submitted
10/03/2024, 16:29
Static task
static1
Behavioral task
behavioral1
Sample
2024-03-10_71631bd4df6e8882695f1b8f8233fb71_cryptolocker.exe
Resource
win7-20240221-en
Behavioral task
behavioral2
Sample
2024-03-10_71631bd4df6e8882695f1b8f8233fb71_cryptolocker.exe
Resource
win10v2004-20240226-en
General
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Target
2024-03-10_71631bd4df6e8882695f1b8f8233fb71_cryptolocker.exe
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Size
62KB
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MD5
71631bd4df6e8882695f1b8f8233fb71
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SHA1
761b85bb5d012701da3bdfd28942513a9e401aff
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SHA256
87df76e890933c81748298b443f6bc81bdcc37c46d13d53f7c8f27fed682da48
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SHA512
15230aef1f23254bc4253c5511bec417e459e3b6d2b3f4791792b79348c715216f60f6d361ffd6b194c662802944684e1d74adfb050cbc4cdb937edb09b79980
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SSDEEP
1536:qmbhXDmjr5MOtEvwDpj5cDtKkQZQRKb61vSbgtstY:BbdDmjr+OtEvwDpjM8W
Malware Config
Signatures
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Detection of CryptoLocker Variants 5 IoCs
resource yara_rule behavioral2/memory/4640-0-0x0000000000500000-0x0000000000510000-memory.dmp CryptoLocker_rule2 behavioral2/files/0x000700000001ebc7-13.dat CryptoLocker_rule2 behavioral2/memory/4640-18-0x0000000000500000-0x0000000000510000-memory.dmp CryptoLocker_rule2 behavioral2/memory/756-17-0x0000000000500000-0x0000000000510000-memory.dmp CryptoLocker_rule2 behavioral2/memory/756-27-0x0000000000500000-0x0000000000510000-memory.dmp CryptoLocker_rule2 -
Detection of Cryptolocker Samples 2 IoCs
resource yara_rule behavioral2/memory/4640-18-0x0000000000500000-0x0000000000510000-memory.dmp CryptoLocker_set1 behavioral2/memory/756-27-0x0000000000500000-0x0000000000510000-memory.dmp CryptoLocker_set1 -
UPX dump on OEP (original entry point) 5 IoCs
resource yara_rule behavioral2/memory/4640-0-0x0000000000500000-0x0000000000510000-memory.dmp UPX behavioral2/files/0x000700000001ebc7-13.dat UPX behavioral2/memory/4640-18-0x0000000000500000-0x0000000000510000-memory.dmp UPX behavioral2/memory/756-17-0x0000000000500000-0x0000000000510000-memory.dmp UPX behavioral2/memory/756-27-0x0000000000500000-0x0000000000510000-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-1-5-21-566096764-1992588923-1249862864-1000\Control Panel\International\Geo\Nation 2024-03-10_71631bd4df6e8882695f1b8f8233fb71_cryptolocker.exe -
Executes dropped EXE 1 IoCs
pid Process 756 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 4640 wrote to memory of 756 4640 2024-03-10_71631bd4df6e8882695f1b8f8233fb71_cryptolocker.exe 88 PID 4640 wrote to memory of 756 4640 2024-03-10_71631bd4df6e8882695f1b8f8233fb71_cryptolocker.exe 88 PID 4640 wrote to memory of 756 4640 2024-03-10_71631bd4df6e8882695f1b8f8233fb71_cryptolocker.exe 88
Processes
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C:\Users\Admin\AppData\Local\Temp\2024-03-10_71631bd4df6e8882695f1b8f8233fb71_cryptolocker.exe"C:\Users\Admin\AppData\Local\Temp\2024-03-10_71631bd4df6e8882695f1b8f8233fb71_cryptolocker.exe"1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:4640 -
C:\Users\Admin\AppData\Local\Temp\asih.exe"C:\Users\Admin\AppData\Local\Temp\asih.exe"2⤵
- Executes dropped EXE
PID:756
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Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
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Filesize
62KB
MD5ce7d8e63150488b8885357fdc432493a
SHA108f7d164082f02b7dbd69d5b8a18da8090d0262b
SHA256741f1f80ba1daa314fc4099972e7eae4af12a8a7743d9b03aadf5409c169d85d
SHA5126bee0af6d4adc31f42ef566d51a9949fe401faefcc62dd18a4f33991718b2b32d2089cfc5337f8daf1c69524f356bba409c71d7b79e219369e199f12242ea5e4