Analysis
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max time kernel
150s -
max time network
150s -
platform
windows10-2004_x64 -
resource
win10v2004-20240508-en -
resource tags
arch:x64arch:x86image:win10v2004-20240508-enlocale:en-usos:windows10-2004-x64system -
submitted
23-05-2024 04:02
Static task
static1
Behavioral task
behavioral1
Sample
2024-05-23_fada75264041135ca2259ed5ef364e16_cryptolocker.exe
Resource
win7-20240215-en
Behavioral task
behavioral2
Sample
2024-05-23_fada75264041135ca2259ed5ef364e16_cryptolocker.exe
Resource
win10v2004-20240508-en
General
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Target
2024-05-23_fada75264041135ca2259ed5ef364e16_cryptolocker.exe
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Size
31KB
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MD5
fada75264041135ca2259ed5ef364e16
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SHA1
653a0a297b7a3a0ca1f5263f0771090687d869bd
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SHA256
e52e8b17adaf6ce092801dedc45dc331dd67a3c312aa9904c253f356f47fd1d2
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SHA512
e086d9d4e26f747ea3239c97a906c0b5d8b3ac156876151f4d090f8e9d2a3e672687d539ef3ac392c96e688722449e825603f41297c040236db9eeef2bf814ff
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SSDEEP
384:bM7Q0pjC4GybxMv01d3AcASBQMf6i/zznum+U8Ss87vhN:b/yC4GyNM01GuQMNXum+NSnN
Malware Config
Signatures
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Detection of CryptoLocker Variants 1 IoCs
Processes:
resource yara_rule C:\Users\Admin\AppData\Local\Temp\retln.exe CryptoLocker_rule2 -
Checks computer location settings 2 TTPs 1 IoCs
Looks up country code configured in the registry, likely geofence.
Processes:
2024-05-23_fada75264041135ca2259ed5ef364e16_cryptolocker.exedescription ioc process Key value queried \REGISTRY\USER\S-1-5-21-2804150937-2146708401-419095071-1000\Control Panel\International\Geo\Nation 2024-05-23_fada75264041135ca2259ed5ef364e16_cryptolocker.exe -
Executes dropped EXE 1 IoCs
Processes:
retln.exepid process 4012 retln.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
Processes:
2024-05-23_fada75264041135ca2259ed5ef364e16_cryptolocker.exedescription pid process target process PID 3444 wrote to memory of 4012 3444 2024-05-23_fada75264041135ca2259ed5ef364e16_cryptolocker.exe retln.exe PID 3444 wrote to memory of 4012 3444 2024-05-23_fada75264041135ca2259ed5ef364e16_cryptolocker.exe retln.exe PID 3444 wrote to memory of 4012 3444 2024-05-23_fada75264041135ca2259ed5ef364e16_cryptolocker.exe retln.exe
Processes
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C:\Users\Admin\AppData\Local\Temp\2024-05-23_fada75264041135ca2259ed5ef364e16_cryptolocker.exe"C:\Users\Admin\AppData\Local\Temp\2024-05-23_fada75264041135ca2259ed5ef364e16_cryptolocker.exe"1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Local\Temp\retln.exe"C:\Users\Admin\AppData\Local\Temp\retln.exe"2⤵
- Executes dropped EXE
Network
MITRE ATT&CK Matrix ATT&CK v13
Replay Monitor
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Downloads
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C:\Users\Admin\AppData\Local\Temp\retln.exeFilesize
31KB
MD5ab2aa4c11872ef2cec1e0e74e2198441
SHA1f64b01fc73c11460d306d8152696eddcc1452592
SHA2569e8539c21f75c74dafdd2edf1f87b544ba2bdb803a9b882045be66c6f0c8fa2f
SHA512106298da455b5cc3fc0e668ff2a7f0580fe78ec5a83b40f845f92cf1f635d5417ac523648e73625a4a252763189032dc8ce63b84e9ddb09a288cc6ed558e0ae2
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memory/3444-0-0x0000000002020000-0x0000000002026000-memory.dmpFilesize
24KB
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memory/3444-1-0x0000000000400000-0x0000000000406000-memory.dmpFilesize
24KB
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memory/3444-8-0x0000000002020000-0x0000000002026000-memory.dmpFilesize
24KB
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memory/4012-25-0x0000000002120000-0x0000000002126000-memory.dmpFilesize
24KB