Analysis
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max time kernel
150s -
max time network
147s -
platform
windows10-2004_x64 -
resource
win10v2004-20240221-en -
resource tags
arch:x64arch:x86image:win10v2004-20240221-enlocale:en-usos:windows10-2004-x64system -
submitted
23/02/2024, 12:24
Static task
static1
Behavioral task
behavioral1
Sample
2024-02-23_039639897dfa9ce009814a85e3bea278_cryptolocker.exe
Resource
win7-20240221-en
Behavioral task
behavioral2
Sample
2024-02-23_039639897dfa9ce009814a85e3bea278_cryptolocker.exe
Resource
win10v2004-20240221-en
General
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Target
2024-02-23_039639897dfa9ce009814a85e3bea278_cryptolocker.exe
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Size
34KB
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MD5
039639897dfa9ce009814a85e3bea278
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SHA1
3717cfc4639e198e732e8f0a30f0a560de3b0c92
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SHA256
4bde26866a1ac68a478218301e9f70eabaebe88788906c1d8a528059eb1f3ca3
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SHA512
1f94d859e25964760acecfa3a021ea214cbf7f827b3777e591f83515a8a6ce2f9be8774197ed6cc00ccb0216138953debe6717ba34320c43b6b2fbafa1d017c2
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SSDEEP
384:bM7Q0pjC4GybxMv01d3AcASBQMf6i/zzzcYgUPSznHzl6A0X/EIjhz:b/yC4GyNM01GuQMNXw2PSjH+PPhz
Malware Config
Signatures
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Detection of CryptoLocker Variants 1 IoCs
resource yara_rule behavioral2/files/0x000b0000000231ac-12.dat CryptoLocker_rule2 -
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-1-5-21-3316742141-2240921845-2885234760-1000\Control Panel\International\Geo\Nation 2024-02-23_039639897dfa9ce009814a85e3bea278_cryptolocker.exe -
Executes dropped EXE 1 IoCs
pid Process 2636 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
description pid Process procid_target PID 5100 wrote to memory of 2636 5100 2024-02-23_039639897dfa9ce009814a85e3bea278_cryptolocker.exe 88 PID 5100 wrote to memory of 2636 5100 2024-02-23_039639897dfa9ce009814a85e3bea278_cryptolocker.exe 88 PID 5100 wrote to memory of 2636 5100 2024-02-23_039639897dfa9ce009814a85e3bea278_cryptolocker.exe 88
Processes
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C:\Users\Admin\AppData\Local\Temp\2024-02-23_039639897dfa9ce009814a85e3bea278_cryptolocker.exe"C:\Users\Admin\AppData\Local\Temp\2024-02-23_039639897dfa9ce009814a85e3bea278_cryptolocker.exe"1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:5100 -
C:\Users\Admin\AppData\Local\Temp\retln.exe"C:\Users\Admin\AppData\Local\Temp\retln.exe"2⤵
- Executes dropped EXE
PID:2636
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Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
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Filesize
34KB
MD5d106438f54a7f8f56938bcaae89dcb5e
SHA1f39add7714cdc6620e98c179b9527324253e776b
SHA25688bd3679069fb49248f709f567c52ee00cf70eed32c295a52b2a709bc6aca660
SHA51269da391154def502d24c41fc4617b20e29db8dc926e874f90d4355b3da6b2f9d24b996ee75bd8c1acefabf19a53f64ac6bf07da33c186869dee5677ea4afdc08