6f74737d6daaaa81dc377da5b70b96db9d56490f169a5294117b2b00760ae70f

Analysis

max time kernel
144s
max time network
149s
platform
windows10-2004_x64
resource
win10v2004-20231215-en
resource tags

arch:x64arch:x86image:win10v2004-20231215-enlocale:en-usos:windows10-2004-x64system
submitted
12-02-2024 18:25

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General

Target

2024-02-12_3611c86ba46155a7f2dfdaaa594cd0d0_cryptolocker.exe
Size

34KB
MD5

3611c86ba46155a7f2dfdaaa594cd0d0
SHA1

3d26a287cd6d79f7b244e3cbec1256b1525f8bb0
SHA256

6f74737d6daaaa81dc377da5b70b96db9d56490f169a5294117b2b00760ae70f
SHA512

9cfc39309bf3904343af4287b5f3dff0823c3cdbaba991f0da656aef5c844f2691245ffd08e72dd66f72bf2892e62a3a20cd268dc2a0d51f0dac328987f822ad
SSDEEP

768:qUmnjFom/kLyMro2GtOOtEvwDpjeMLam5axKpH:qUmnpomddpMOtEvwDpjjaYai

Score

9^/10

upx

Malware Config

Signatures

Detection of CryptoLocker Variants 5 IoCs

Processes:

resource	yara_rule
behavioral2/memory/2708-0-0x0000000000500000-0x000000000050F000-memory.dmp	CryptoLocker_rule2
C:\Users\Admin\AppData\Local\Temp\asih.exe	CryptoLocker_rule2
behavioral2/memory/1836-17-0x0000000000500000-0x000000000050F000-memory.dmp	CryptoLocker_rule2
behavioral2/memory/2708-18-0x0000000000500000-0x000000000050F000-memory.dmp	CryptoLocker_rule2
behavioral2/memory/1836-27-0x0000000000500000-0x000000000050F000-memory.dmp	CryptoLocker_rule2

Detection of Cryptolocker Samples 5 IoCs

Processes:

resource	yara_rule
behavioral2/memory/2708-0-0x0000000000500000-0x000000000050F000-memory.dmp	CryptoLocker_set1
C:\Users\Admin\AppData\Local\Temp\asih.exe	CryptoLocker_set1
behavioral2/memory/1836-17-0x0000000000500000-0x000000000050F000-memory.dmp	CryptoLocker_set1
behavioral2/memory/2708-18-0x0000000000500000-0x000000000050F000-memory.dmp	CryptoLocker_set1
behavioral2/memory/1836-27-0x0000000000500000-0x000000000050F000-memory.dmp	CryptoLocker_set1

UPX dump on OEP (original entry point) 5 IoCs

Processes:

resource	yara_rule
behavioral2/memory/2708-0-0x0000000000500000-0x000000000050F000-memory.dmp	UPX
C:\Users\Admin\AppData\Local\Temp\asih.exe	UPX
behavioral2/memory/1836-17-0x0000000000500000-0x000000000050F000-memory.dmp	UPX
behavioral2/memory/2708-18-0x0000000000500000-0x000000000050F000-memory.dmp	UPX
behavioral2/memory/1836-27-0x0000000000500000-0x000000000050F000-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:

2024-02-12_3611c86ba46155a7f2dfdaaa594cd0d0_cryptolocker.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-1815711207-1844170477-3539718864-1000\Control Panel\International\Geo\Nation	2024-02-12_3611c86ba46155a7f2dfdaaa594cd0d0_cryptolocker.exe

Executes dropped EXE 1 IoCs

Processes:

asih.exe

pid process

1836 asih.exe

pid	process
1836	asih.exe

UPX packed file 5 IoCs

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

upx

Processes:

resource	yara_rule
behavioral2/memory/2708-0-0x0000000000500000-0x000000000050F000-memory.dmp	upx
C:\Users\Admin\AppData\Local\Temp\asih.exe	upx
behavioral2/memory/1836-17-0x0000000000500000-0x000000000050F000-memory.dmp	upx
behavioral2/memory/2708-18-0x0000000000500000-0x000000000050F000-memory.dmp	upx
behavioral2/memory/1836-27-0x0000000000500000-0x000000000050F000-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:

2024-02-12_3611c86ba46155a7f2dfdaaa594cd0d0_cryptolocker.exe

description	pid	process	target process
PID 2708 wrote to memory of 1836	2708	2024-02-12_3611c86ba46155a7f2dfdaaa594cd0d0_cryptolocker.exe	asih.exe
PID 2708 wrote to memory of 1836	2708	2024-02-12_3611c86ba46155a7f2dfdaaa594cd0d0_cryptolocker.exe	asih.exe
PID 2708 wrote to memory of 1836	2708	2024-02-12_3611c86ba46155a7f2dfdaaa594cd0d0_cryptolocker.exe	asih.exe

C:\Users\Admin\AppData\Local\Temp\2024-02-12_3611c86ba46155a7f2dfdaaa594cd0d0_cryptolocker.exe
"C:\Users\Admin\AppData\Local\Temp\2024-02-12_3611c86ba46155a7f2dfdaaa594cd0d0_cryptolocker.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:2708

C:\Users\Admin\AppData\Local\Temp\asih.exe
"C:\Users\Admin\AppData\Local\Temp\asih.exe"
2⤵
- Executes dropped EXE
PID:1836

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\asih.exe

Filesize
34KB

MD5
58a47b626f7a7e35b317fda27c2c1219

SHA1
712afc6ed8ad1e40117cc833638278433029bf97

SHA256
959ac1c070c631b7e6fb7748d07d669d3382b6a75bcc7cfcae9d09336a125482

SHA512
bab6db08a44decc36f183b3e6adadc1c8e64591f13a47d970bc750cab9865d19f966bbd4c0c0b35855418791b3fce433d7215b00d95e555e0f5cb39b83bae964

Download Submit
memory/1836-17-0x0000000000500000-0x000000000050F000-memory.dmp

Filesize
60KB

Download
memory/1836-20-0x00000000005F0000-0x00000000005F6000-memory.dmp

Filesize
24KB

Download
memory/1836-22-0x00000000004F0000-0x00000000004F6000-memory.dmp

Filesize
24KB

Download
memory/1836-27-0x0000000000500000-0x000000000050F000-memory.dmp

Filesize
60KB

Download
memory/2708-0-0x0000000000500000-0x000000000050F000-memory.dmp

Filesize
60KB

Download
memory/2708-1-0x0000000000830000-0x0000000000836000-memory.dmp

Filesize
24KB

Download
memory/2708-2-0x0000000000830000-0x0000000000836000-memory.dmp

Filesize
24KB

Download
memory/2708-3-0x00000000020F0000-0x00000000020F6000-memory.dmp

Filesize
24KB

Download
memory/2708-18-0x0000000000500000-0x000000000050F000-memory.dmp

Filesize
60KB

Download