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Analysis
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max time kernel
149s -
max time network
153s -
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, 15:01
Behavioral task
behavioral1
Sample
2024-02-23_531b1f068781d8d656db25dae5a04895_cryptolocker.exe
Resource
win7-20240215-en
Behavioral task
behavioral2
Sample
2024-02-23_531b1f068781d8d656db25dae5a04895_cryptolocker.exe
Resource
win10v2004-20240221-en
General
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Target
2024-02-23_531b1f068781d8d656db25dae5a04895_cryptolocker.exe
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Size
88KB
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MD5
531b1f068781d8d656db25dae5a04895
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SHA1
15b4a519f48dc903dbe6eb197e3a4b21872c915f
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SHA256
b6eff88fe5c80a21524ddf67a0f68529fb648196eada34849898094e2bda086f
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SHA512
fcaee05173c711b3e2a16a625b11158a47bc7f37b4104e77dc134adbd66adf1a1aabda578c53940a10092ef758f0c6dd217433bbc515577f888b220265724db5
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SSDEEP
1536:qkmnpomddpMOtEvwDpjJGYQbN/PKwMgL9:AnBdOOtEvwDpj6zF
Malware Config
Signatures
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Detection of CryptoLocker Variants 4 IoCs
resource yara_rule behavioral2/memory/2356-0-0x0000000000500000-0x000000000050F000-memory.dmp CryptoLocker_rule2 behavioral2/files/0x0008000000023260-13.dat CryptoLocker_rule2 behavioral2/memory/2356-17-0x0000000000500000-0x000000000050F000-memory.dmp CryptoLocker_rule2 behavioral2/memory/3752-26-0x0000000000500000-0x000000000050F000-memory.dmp CryptoLocker_rule2 -
Detection of Cryptolocker Samples 4 IoCs
resource yara_rule behavioral2/memory/2356-0-0x0000000000500000-0x000000000050F000-memory.dmp CryptoLocker_set1 behavioral2/files/0x0008000000023260-13.dat CryptoLocker_set1 behavioral2/memory/2356-17-0x0000000000500000-0x000000000050F000-memory.dmp CryptoLocker_set1 behavioral2/memory/3752-26-0x0000000000500000-0x000000000050F000-memory.dmp CryptoLocker_set1 -
UPX dump on OEP (original entry point) 4 IoCs
resource yara_rule behavioral2/memory/2356-0-0x0000000000500000-0x000000000050F000-memory.dmp UPX behavioral2/files/0x0008000000023260-13.dat UPX behavioral2/memory/2356-17-0x0000000000500000-0x000000000050F000-memory.dmp UPX behavioral2/memory/3752-26-0x0000000000500000-0x000000000050F000-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-1-5-21-910440534-423636034-2318342392-1000\Control Panel\International\Geo\Nation 2024-02-23_531b1f068781d8d656db25dae5a04895_cryptolocker.exe -
Executes dropped EXE 1 IoCs
pid Process 3752 asih.exe -
resource yara_rule behavioral2/memory/2356-0-0x0000000000500000-0x000000000050F000-memory.dmp upx behavioral2/files/0x0008000000023260-13.dat upx behavioral2/memory/2356-17-0x0000000000500000-0x000000000050F000-memory.dmp upx behavioral2/memory/3752-26-0x0000000000500000-0x000000000050F000-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
description pid Process procid_target PID 2356 wrote to memory of 3752 2356 2024-02-23_531b1f068781d8d656db25dae5a04895_cryptolocker.exe 85 PID 2356 wrote to memory of 3752 2356 2024-02-23_531b1f068781d8d656db25dae5a04895_cryptolocker.exe 85 PID 2356 wrote to memory of 3752 2356 2024-02-23_531b1f068781d8d656db25dae5a04895_cryptolocker.exe 85
Processes
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C:\Users\Admin\AppData\Local\Temp\2024-02-23_531b1f068781d8d656db25dae5a04895_cryptolocker.exe"C:\Users\Admin\AppData\Local\Temp\2024-02-23_531b1f068781d8d656db25dae5a04895_cryptolocker.exe"1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:2356 -
C:\Users\Admin\AppData\Local\Temp\asih.exe"C:\Users\Admin\AppData\Local\Temp\asih.exe"2⤵
- Executes dropped EXE
PID:3752
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Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
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Filesize
88KB
MD50ebaec12b219817bde124eaae0c2c260
SHA12a97f87ebecf6eee65b41f73f246a4e4278eb2f5
SHA25677cf44c51ad2f489f2a12affbd37241d316b376ad4f12d56a09a795c262d53ad
SHA51266075db413dd74e4030e399f53819a5f9d6b3fd7f5e95c0afc1df43b1be9b5cad185d6004e5e8e3a1627fc93751328eb8900bd58fe5506e7dba9120bc20de3f1