Analysis
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max time kernel
148s -
max time network
149s -
platform
windows10-2004_x64 -
resource
win10v2004-20231222-en -
resource tags
arch:x64arch:x86image:win10v2004-20231222-enlocale:en-usos:windows10-2004-x64system -
submitted
12-02-2024 20:01
Behavioral task
behavioral1
Sample
2024-02-12_2b9317ce1ff64ac9e92a035733c1b2a5_cryptolocker.exe
Resource
win7-20231215-en
Behavioral task
behavioral2
Sample
2024-02-12_2b9317ce1ff64ac9e92a035733c1b2a5_cryptolocker.exe
Resource
win10v2004-20231222-en
General
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Target
2024-02-12_2b9317ce1ff64ac9e92a035733c1b2a5_cryptolocker.exe
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Size
85KB
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MD5
2b9317ce1ff64ac9e92a035733c1b2a5
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SHA1
844ced38c37023fb7243e35c72062c3d41b5ef87
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SHA256
45404abe43696c3f8e93cad1bcb2ab476ef4c71473fd6ba0b05e6407d9c47d44
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SHA512
0f3d2ba45a48d4133b9431dd8a038cc49f3ab27b22dea716d1dcba76669da757a30a8f513590cb1580b9c3ae3fb5a6cc855387bab2ebfc0b77ddba44605cd82e
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SSDEEP
768:qkmnjFom/kLyMro2GtOOtEvwDpjeY10Y/YMsvlMdwPK80GQuchoIgtIJWV:qkmnpomddpMOtEvwDpjJGYQbN/PKwMgB
Malware Config
Signatures
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Detection of CryptoLocker Variants 5 IoCs
Processes:
resource yara_rule behavioral2/memory/2628-0-0x0000000000500000-0x000000000050F000-memory.dmp CryptoLocker_rule2 C:\Users\Admin\AppData\Local\Temp\asih.exe CryptoLocker_rule2 behavioral2/memory/2628-17-0x0000000000500000-0x000000000050F000-memory.dmp CryptoLocker_rule2 behavioral2/memory/2448-18-0x0000000000500000-0x000000000050F000-memory.dmp CryptoLocker_rule2 behavioral2/memory/2448-27-0x0000000000500000-0x000000000050F000-memory.dmp CryptoLocker_rule2 -
Detection of Cryptolocker Samples 5 IoCs
Processes:
resource yara_rule behavioral2/memory/2628-0-0x0000000000500000-0x000000000050F000-memory.dmp CryptoLocker_set1 C:\Users\Admin\AppData\Local\Temp\asih.exe CryptoLocker_set1 behavioral2/memory/2628-17-0x0000000000500000-0x000000000050F000-memory.dmp CryptoLocker_set1 behavioral2/memory/2448-18-0x0000000000500000-0x000000000050F000-memory.dmp CryptoLocker_set1 behavioral2/memory/2448-27-0x0000000000500000-0x000000000050F000-memory.dmp CryptoLocker_set1 -
UPX dump on OEP (original entry point) 5 IoCs
Processes:
resource yara_rule behavioral2/memory/2628-0-0x0000000000500000-0x000000000050F000-memory.dmp UPX C:\Users\Admin\AppData\Local\Temp\asih.exe UPX behavioral2/memory/2628-17-0x0000000000500000-0x000000000050F000-memory.dmp UPX behavioral2/memory/2448-18-0x0000000000500000-0x000000000050F000-memory.dmp UPX behavioral2/memory/2448-27-0x0000000000500000-0x000000000050F000-memory.dmp UPX -
Checks computer location settings 2 TTPs 1 IoCs
Looks up country code configured in the registry, likely geofence.
Processes:
2024-02-12_2b9317ce1ff64ac9e92a035733c1b2a5_cryptolocker.exedescription ioc process Key value queried \REGISTRY\USER\S-1-5-21-1168293393-3419776239-306423207-1000\Control Panel\International\Geo\Nation 2024-02-12_2b9317ce1ff64ac9e92a035733c1b2a5_cryptolocker.exe -
Executes dropped EXE 1 IoCs
Processes:
asih.exepid process 2448 asih.exe -
Processes:
resource yara_rule behavioral2/memory/2628-0-0x0000000000500000-0x000000000050F000-memory.dmp upx C:\Users\Admin\AppData\Local\Temp\asih.exe upx behavioral2/memory/2628-17-0x0000000000500000-0x000000000050F000-memory.dmp upx behavioral2/memory/2448-18-0x0000000000500000-0x000000000050F000-memory.dmp upx behavioral2/memory/2448-27-0x0000000000500000-0x000000000050F000-memory.dmp upx -
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:
2024-02-12_2b9317ce1ff64ac9e92a035733c1b2a5_cryptolocker.exedescription pid process target process PID 2628 wrote to memory of 2448 2628 2024-02-12_2b9317ce1ff64ac9e92a035733c1b2a5_cryptolocker.exe asih.exe PID 2628 wrote to memory of 2448 2628 2024-02-12_2b9317ce1ff64ac9e92a035733c1b2a5_cryptolocker.exe asih.exe PID 2628 wrote to memory of 2448 2628 2024-02-12_2b9317ce1ff64ac9e92a035733c1b2a5_cryptolocker.exe asih.exe
Processes
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C:\Users\Admin\AppData\Local\Temp\2024-02-12_2b9317ce1ff64ac9e92a035733c1b2a5_cryptolocker.exe"C:\Users\Admin\AppData\Local\Temp\2024-02-12_2b9317ce1ff64ac9e92a035733c1b2a5_cryptolocker.exe"1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Local\Temp\asih.exe"C:\Users\Admin\AppData\Local\Temp\asih.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\asih.exeFilesize
86KB
MD506b7c977510ef19c6f7cc2b64ecc1f26
SHA1d401cc0ec56546896acb2a84307e17f0ca3ec23f
SHA256eb177b900aac1468d3db73052cd6348eebd51c1a7a7817e6eee8f1ea765060fd
SHA5127b294b94a88664025135790a1506b27778fc28b18d5deb642a3aebeaffa24e05e10573c9fcf5e38639fb3875a52f40e6b1cc2d4eb8d304a765fad77eb833d4e7
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memory/2448-18-0x0000000000500000-0x000000000050F000-memory.dmpFilesize
60KB
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memory/2448-21-0x00000000005E0000-0x00000000005E6000-memory.dmpFilesize
24KB
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memory/2448-20-0x00000000004D0000-0x00000000004D6000-memory.dmpFilesize
24KB
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memory/2448-27-0x0000000000500000-0x000000000050F000-memory.dmpFilesize
60KB
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memory/2628-0-0x0000000000500000-0x000000000050F000-memory.dmpFilesize
60KB
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memory/2628-1-0x0000000000620000-0x0000000000626000-memory.dmpFilesize
24KB
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memory/2628-2-0x0000000000620000-0x0000000000626000-memory.dmpFilesize
24KB
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memory/2628-3-0x0000000000750000-0x0000000000756000-memory.dmpFilesize
24KB
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memory/2628-17-0x0000000000500000-0x000000000050F000-memory.dmpFilesize
60KB