baa357e6b7a668181cd00fe40c4c1b6562e33861fc38bc2b3e46d09f51ab11a6

Analysis

max time kernel
148s
max time network
158s
platform
windows10-2004_x64
resource
win10v2004-20240426-en
resource tags

arch:x64arch:x86image:win10v2004-20240426-enlocale:en-usos:windows10-2004-x64system
submitted
23-05-2024 01:24

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General

Target

2024-05-23_3acb03055347d54be2378309fd803f1a_cryptolocker.exe
Size

39KB
MD5

3acb03055347d54be2378309fd803f1a
SHA1

c28a95780d0b7d0873e6da2cba8e00fdb9bd213c
SHA256

baa357e6b7a668181cd00fe40c4c1b6562e33861fc38bc2b3e46d09f51ab11a6
SHA512

a85f07e17ff1f11d763ea20c83519c3229101deb8c512568ff21990f1a3589c2e01c3ba6b48dd95c3c2d6091b2dda8a73f575253e604564b9773e352b7199a21
SSDEEP

768:q7PdFecFS5agQtOOtEvwDpjeMLZdzuqpXsiE8Wq/DpkITYX6:qDdFJy3QMOtEvwDpjjWMl7Tj

Score

9^/10

upx

Malware Config

Signatures

Detection of CryptoLocker Variants 5 IoCs

Processes:

resource	yara_rule
behavioral2/memory/4588-0-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2
C:\Users\Admin\AppData\Local\Temp\asih.exe	CryptoLocker_rule2
behavioral2/memory/4588-18-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2
behavioral2/memory/1560-19-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2
behavioral2/memory/1560-28-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2

Detection of Cryptolocker Samples 5 IoCs

Processes:

resource	yara_rule
behavioral2/memory/4588-0-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1
C:\Users\Admin\AppData\Local\Temp\asih.exe	CryptoLocker_set1
behavioral2/memory/4588-18-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1
behavioral2/memory/1560-19-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1
behavioral2/memory/1560-28-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1

UPX dump on OEP (original entry point) 5 IoCs

Processes:

resource	yara_rule
behavioral2/memory/4588-0-0x0000000000500000-0x0000000000510000-memory.dmp	UPX
C:\Users\Admin\AppData\Local\Temp\asih.exe	UPX
behavioral2/memory/4588-18-0x0000000000500000-0x0000000000510000-memory.dmp	UPX
behavioral2/memory/1560-19-0x0000000000500000-0x0000000000510000-memory.dmp	UPX
behavioral2/memory/1560-28-0x0000000000500000-0x0000000000510000-memory.dmp	UPX

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

Processes:

2024-05-23_3acb03055347d54be2378309fd803f1a_cryptolocker.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-4018855536-2201274732-320770143-1000\Control Panel\International\Geo\Nation	2024-05-23_3acb03055347d54be2378309fd803f1a_cryptolocker.exe

Executes dropped EXE 1 IoCs

Processes:

asih.exe

pid process

1560 asih.exe

pid	process
1560	asih.exe

UPX packed file 5 IoCs

Detects executables packed with UPX/modified UPX open source packer.

upx

Processes:

resource	yara_rule
behavioral2/memory/4588-0-0x0000000000500000-0x0000000000510000-memory.dmp	upx
C:\Users\Admin\AppData\Local\Temp\asih.exe	upx
behavioral2/memory/4588-18-0x0000000000500000-0x0000000000510000-memory.dmp	upx
behavioral2/memory/1560-19-0x0000000000500000-0x0000000000510000-memory.dmp	upx
behavioral2/memory/1560-28-0x0000000000500000-0x0000000000510000-memory.dmp	upx

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

Suspicious use of WriteProcessMemory 3 IoCs

Processes:

2024-05-23_3acb03055347d54be2378309fd803f1a_cryptolocker.exe

description	pid	process	target process
PID 4588 wrote to memory of 1560	4588	2024-05-23_3acb03055347d54be2378309fd803f1a_cryptolocker.exe	asih.exe
PID 4588 wrote to memory of 1560	4588	2024-05-23_3acb03055347d54be2378309fd803f1a_cryptolocker.exe	asih.exe
PID 4588 wrote to memory of 1560	4588	2024-05-23_3acb03055347d54be2378309fd803f1a_cryptolocker.exe	asih.exe

C:\Users\Admin\AppData\Local\Temp\2024-05-23_3acb03055347d54be2378309fd803f1a_cryptolocker.exe
"C:\Users\Admin\AppData\Local\Temp\2024-05-23_3acb03055347d54be2378309fd803f1a_cryptolocker.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:4588

C:\Users\Admin\AppData\Local\Temp\asih.exe
"C:\Users\Admin\AppData\Local\Temp\asih.exe"
2⤵
- Executes dropped EXE
PID:1560

Network

MITRE ATT&CK Matrix ATT&CK v13

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Resource Development

Reconnaissance

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\asih.exe
Filesize
39KB

MD5
d83cfa1b76892926efac659cf294c918

SHA1
f09b449bda6caa3ff6b811c5f787297b9331fff3

SHA256
d679fb5e6803dfdbe83fbda90fbd818704d5964b2b8f6eaddaa3917cd1b45e18

SHA512
0916db7c7f157e586d9762938d341de27b797dd0ea5641c0c88c9f18e179fa3a8dda4dd1d08f243f0c9dda15ffda571e297ed056dcf1fa9dec9b6c8d57366332

Download Submit
memory/1560-19-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download
memory/1560-21-0x0000000000690000-0x0000000000696000-memory.dmp

Filesize
24KB

Download
memory/1560-27-0x0000000000660000-0x0000000000666000-memory.dmp

Filesize
24KB

Download
memory/1560-28-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download
memory/4588-0-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download
memory/4588-1-0x00000000005A0000-0x00000000005A6000-memory.dmp

Filesize
24KB

Download
memory/4588-2-0x00000000005E0000-0x00000000005E6000-memory.dmp

Filesize
24KB

Download
memory/4588-9-0x00000000005A0000-0x00000000005A6000-memory.dmp

Filesize
24KB

Download
memory/4588-18-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download