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Analysis
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max time kernel
148s -
max time network
150s -
platform
windows10-2004_x64 -
resource
win10v2004-20240226-en -
resource tags
arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system -
submitted
05/04/2024, 02:54
Behavioral task
behavioral1
Sample
2024-04-05_cd5ff9948c6df62d4cfd69e773c5740e_cryptolocker.exe
Resource
win7-20240215-en
Behavioral task
behavioral2
Sample
2024-04-05_cd5ff9948c6df62d4cfd69e773c5740e_cryptolocker.exe
Resource
win10v2004-20240226-en
General
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Target
2024-04-05_cd5ff9948c6df62d4cfd69e773c5740e_cryptolocker.exe
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Size
82KB
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MD5
cd5ff9948c6df62d4cfd69e773c5740e
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SHA1
7a2b839234cea6cde13f3017ba46df6851f89dfd
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SHA256
1efcc9c19e08b55e7962ad3df778685e6014927e541843e20978f44d113e9fd5
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SHA512
88f4737da5f228b97923737e59b8a7faaeb174036f683d6053a6cb4ac3422f04a189535612b6f2677e3dd3762e2edea126fdb88298f056eb28684bae180e703b
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SSDEEP
1536:T6QFElP6n+gxmddpMOtEvwDpjwaxTNUOT75:T6a+rdOOtEvwDpjNF
Malware Config
Signatures
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Detection of CryptoLocker Variants 4 IoCs
resource yara_rule behavioral2/memory/1656-0-0x0000000000500000-0x0000000000510000-memory.dmp CryptoLocker_rule2 behavioral2/files/0x00090000000224e9-13.dat CryptoLocker_rule2 behavioral2/memory/1656-17-0x0000000000500000-0x0000000000510000-memory.dmp CryptoLocker_rule2 behavioral2/memory/3396-26-0x0000000000500000-0x0000000000510000-memory.dmp CryptoLocker_rule2 -
Detection of Cryptolocker Samples 4 IoCs
resource yara_rule behavioral2/memory/1656-0-0x0000000000500000-0x0000000000510000-memory.dmp CryptoLocker_set1 behavioral2/files/0x00090000000224e9-13.dat CryptoLocker_set1 behavioral2/memory/1656-17-0x0000000000500000-0x0000000000510000-memory.dmp CryptoLocker_set1 behavioral2/memory/3396-26-0x0000000000500000-0x0000000000510000-memory.dmp CryptoLocker_set1 -
UPX dump on OEP (original entry point) 4 IoCs
resource yara_rule behavioral2/memory/1656-0-0x0000000000500000-0x0000000000510000-memory.dmp UPX behavioral2/files/0x00090000000224e9-13.dat UPX behavioral2/memory/1656-17-0x0000000000500000-0x0000000000510000-memory.dmp UPX behavioral2/memory/3396-26-0x0000000000500000-0x0000000000510000-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-1-5-21-3270530367-132075249-2153716227-1000\Control Panel\International\Geo\Nation 2024-04-05_cd5ff9948c6df62d4cfd69e773c5740e_cryptolocker.exe -
Executes dropped EXE 1 IoCs
pid Process 3396 asih.exe -
resource yara_rule behavioral2/memory/1656-0-0x0000000000500000-0x0000000000510000-memory.dmp upx behavioral2/files/0x00090000000224e9-13.dat upx behavioral2/memory/1656-17-0x0000000000500000-0x0000000000510000-memory.dmp upx behavioral2/memory/3396-26-0x0000000000500000-0x0000000000510000-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 1656 wrote to memory of 3396 1656 2024-04-05_cd5ff9948c6df62d4cfd69e773c5740e_cryptolocker.exe 87 PID 1656 wrote to memory of 3396 1656 2024-04-05_cd5ff9948c6df62d4cfd69e773c5740e_cryptolocker.exe 87 PID 1656 wrote to memory of 3396 1656 2024-04-05_cd5ff9948c6df62d4cfd69e773c5740e_cryptolocker.exe 87
Processes
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C:\Users\Admin\AppData\Local\Temp\2024-04-05_cd5ff9948c6df62d4cfd69e773c5740e_cryptolocker.exe"C:\Users\Admin\AppData\Local\Temp\2024-04-05_cd5ff9948c6df62d4cfd69e773c5740e_cryptolocker.exe"1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:1656 -
C:\Users\Admin\AppData\Local\Temp\asih.exe"C:\Users\Admin\AppData\Local\Temp\asih.exe"2⤵
- Executes dropped EXE
PID:3396
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Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
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Filesize
83KB
MD50809a8a886b5c467eb2fc52eb2e3afbe
SHA17075d30d68ffd83ec4db0b63d3032ef473c419ee
SHA256408d9d769998b46c3de5cc4e1e12c96dcb15f8aabf6d9c35e2a9553e9e66e936
SHA512dcd102f44c36fb48e8adf2c16b496bd976859fcf99be81a5c496f57bca1229685631f5a46102c351556471e4ae923aa38761989619835f676ecf62d485d8bcfc