Analysis
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max time kernel
15s -
max time network
124s -
platform
windows7_x64 -
resource
win7-20231215-en -
resource tags
arch:x64arch:x86image:win7-20231215-enlocale:en-usos:windows7-x64system -
submitted
25-01-2024 15:36
Static task
static1
Behavioral task
behavioral1
Sample
2024-01-25_6f403dddf26e8e95554e0b18e3d6a0cc_cryptolocker.exe
Resource
win7-20231215-en
General
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Target
2024-01-25_6f403dddf26e8e95554e0b18e3d6a0cc_cryptolocker.exe
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Size
31KB
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MD5
6f403dddf26e8e95554e0b18e3d6a0cc
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SHA1
546de8c03bfed2b884cbee5c7f142fec269aed1c
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SHA256
b926658227ec1a05d3f20bee63cfa53b71238913baa5ed266a704e7f6f2826c9
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SHA512
0034e85034bdee349420dcd8a2ee55e15c48b97e5621f16664bf71d94a9aaf0d06fc2417fd579458a607981d6260af4d5b1065b9e6c8a6e2c9a7038f0c0fc5f7
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SSDEEP
384:bM7Q0pjC4GybxMv01d3AcASBQMf6i/zzzcYgUPSznUsDvE:b/yC4GyNM01GuQMNXw2PSjZc
Malware Config
Signatures
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Detection of CryptoLocker Variants 1 IoCs
Processes:
resource yara_rule \Users\Admin\AppData\Local\Temp\retln.exe CryptoLocker_rule2 -
Executes dropped EXE 1 IoCs
Processes:
retln.exepid process 2316 retln.exe -
Loads dropped DLL 1 IoCs
Processes:
2024-01-25_6f403dddf26e8e95554e0b18e3d6a0cc_cryptolocker.exepid process 2204 2024-01-25_6f403dddf26e8e95554e0b18e3d6a0cc_cryptolocker.exe -
Creates a large amount of network flows 1 TTPs
This may indicate a network scan to discover remotely running services.
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Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
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Suspicious use of UnmapMainImage 2 IoCs
Processes:
2024-01-25_6f403dddf26e8e95554e0b18e3d6a0cc_cryptolocker.exeretln.exepid process 2204 2024-01-25_6f403dddf26e8e95554e0b18e3d6a0cc_cryptolocker.exe 2316 retln.exe -
Suspicious use of WriteProcessMemory 4 IoCs
Processes:
2024-01-25_6f403dddf26e8e95554e0b18e3d6a0cc_cryptolocker.exedescription pid process target process PID 2204 wrote to memory of 2316 2204 2024-01-25_6f403dddf26e8e95554e0b18e3d6a0cc_cryptolocker.exe retln.exe PID 2204 wrote to memory of 2316 2204 2024-01-25_6f403dddf26e8e95554e0b18e3d6a0cc_cryptolocker.exe retln.exe PID 2204 wrote to memory of 2316 2204 2024-01-25_6f403dddf26e8e95554e0b18e3d6a0cc_cryptolocker.exe retln.exe PID 2204 wrote to memory of 2316 2204 2024-01-25_6f403dddf26e8e95554e0b18e3d6a0cc_cryptolocker.exe retln.exe
Processes
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C:\Users\Admin\AppData\Local\Temp\2024-01-25_6f403dddf26e8e95554e0b18e3d6a0cc_cryptolocker.exe"C:\Users\Admin\AppData\Local\Temp\2024-01-25_6f403dddf26e8e95554e0b18e3d6a0cc_cryptolocker.exe"1⤵
- Loads dropped DLL
- Suspicious use of UnmapMainImage
- Suspicious use of WriteProcessMemory
PID:2204 -
C:\Users\Admin\AppData\Local\Temp\retln.exe"C:\Users\Admin\AppData\Local\Temp\retln.exe"2⤵
- Executes dropped EXE
- Suspicious use of UnmapMainImage
PID:2316
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
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\Users\Admin\AppData\Local\Temp\retln.exeFilesize
31KB
MD5613c73c528adbcf26ea87fbbe1a97a02
SHA14278e9fa93a4d5e57d09828e36397eb52d9356ad
SHA2565297b43a515ebf2e0646903455a556a393f0758bddbfcfee75f7c989b246356e
SHA512e72d8bc213da25400286b9c57de27bef1d555e5bcc21effe801a7fbad7273fab226935be61928a85c8008de99ffd1b72f7a99339adf4f3c7e74a728b38bfdd24
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memory/2204-0-0x00000000003E0000-0x00000000003E6000-memory.dmpFilesize
24KB
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memory/2204-1-0x0000000000400000-0x0000000000406000-memory.dmpFilesize
24KB
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memory/2204-2-0x00000000003E0000-0x00000000003E6000-memory.dmpFilesize
24KB
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memory/2316-19-0x00000000002E0000-0x00000000002E6000-memory.dmpFilesize
24KB