37567f9e3d3a8377cff676be6e4fab8b641e264fbc09277b5714a305c2e75925

Analysis

max time kernel
148s
max time network
150s
platform
windows10-2004_x64
resource
win10v2004-20231222-en
resource tags

arch:x64arch:x86image:win10v2004-20231222-enlocale:en-usos:windows10-2004-x64system
submitted
28/01/2024, 18:23

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General

Target

2024-01-28_1142eaa4e6ccccb6215ddbaa8fa2f028_cryptolocker.exe
Size

73KB
MD5

1142eaa4e6ccccb6215ddbaa8fa2f028
SHA1

638e1b39028e61fe3f342b85cfaeb09fb70ffaab
SHA256

37567f9e3d3a8377cff676be6e4fab8b641e264fbc09277b5714a305c2e75925
SHA512

28e0f7a4c879d99064cdd8f14f1d3197c433dfe7fb2bcdc5b14a04f4367692debe61791a7adc486c324d82300a3bc1d0d41c33224c07cb17987729cdd33db053
SSDEEP

1536:T6QFElP6n+gxmddpMOtEvwDpjwaxTNUOAkXtBdxPUxuR:T6a+rdOOtEvwDpjNtHPD

Score

9^/10

upx

Malware Config

Signatures

Detection of CryptoLocker Variants 4 IoCs

resource	yara_rule
behavioral2/memory/4292-0-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2
behavioral2/files/0x0007000000023210-13.dat	CryptoLocker_rule2
behavioral2/memory/4292-17-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2
behavioral2/memory/1304-26-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2

Detection of Cryptolocker Samples 4 IoCs

resource	yara_rule
behavioral2/memory/4292-0-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1
behavioral2/files/0x0007000000023210-13.dat	CryptoLocker_set1
behavioral2/memory/4292-17-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1
behavioral2/memory/1304-26-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1

UPX dump on OEP (original entry point) 4 IoCs

resource	yara_rule
behavioral2/memory/4292-0-0x0000000000500000-0x0000000000510000-memory.dmp	UPX
behavioral2/files/0x0007000000023210-13.dat	UPX
behavioral2/memory/4292-17-0x0000000000500000-0x0000000000510000-memory.dmp	UPX
behavioral2/memory/1304-26-0x0000000000500000-0x0000000000510000-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

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-1168293393-3419776239-306423207-1000\Control Panel\International\Geo\Nation	2024-01-28_1142eaa4e6ccccb6215ddbaa8fa2f028_cryptolocker.exe

Executes dropped EXE 1 IoCs

pid	Process
1304	asih.exe

UPX packed file 4 IoCs

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

upx

resource	yara_rule
behavioral2/memory/4292-0-0x0000000000500000-0x0000000000510000-memory.dmp	upx
behavioral2/files/0x0007000000023210-13.dat	upx
behavioral2/memory/4292-17-0x0000000000500000-0x0000000000510000-memory.dmp	upx
behavioral2/memory/1304-26-0x0000000000500000-0x0000000000510000-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

description	pid	Process	procid_target
PID 4292 wrote to memory of 1304	4292	2024-01-28_1142eaa4e6ccccb6215ddbaa8fa2f028_cryptolocker.exe	86
PID 4292 wrote to memory of 1304	4292	2024-01-28_1142eaa4e6ccccb6215ddbaa8fa2f028_cryptolocker.exe	86
PID 4292 wrote to memory of 1304	4292	2024-01-28_1142eaa4e6ccccb6215ddbaa8fa2f028_cryptolocker.exe	86

C:\Users\Admin\AppData\Local\Temp\2024-01-28_1142eaa4e6ccccb6215ddbaa8fa2f028_cryptolocker.exe
"C:\Users\Admin\AppData\Local\Temp\2024-01-28_1142eaa4e6ccccb6215ddbaa8fa2f028_cryptolocker.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:4292
- C:\Users\Admin\AppData\Local\Temp\asih.exe
  "C:\Users\Admin\AppData\Local\Temp\asih.exe"
  2⤵
  - Executes dropped EXE
  PID:1304

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
74KB

MD5
6a4069dd4480d2c634f9e4f831086a4a

SHA1
0fd3c6675b1fd59b8c4ec127da5e6a6eb7950f10

SHA256
ba1cd424696979b5c1706c04b625945ac09d17cae169ff2f9ee9297a9f00ce95

SHA512
58ad319c0298bd6bef2c04140eb9bf735e90692c0de6d851b62163a2886e2147e5d82ef27a151a4adcb9d327117b4394bf163f00abfe9e6b3bbeed470e5b1316

Download Submit
memory/1304-19-0x00000000007D0000-0x00000000007D6000-memory.dmp

Filesize
24KB

Download
memory/1304-23-0x00000000006A0000-0x00000000006A6000-memory.dmp

Filesize
24KB

Download
memory/1304-26-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download
memory/4292-0-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download
memory/4292-1-0x00000000021C0000-0x00000000021C6000-memory.dmp

Filesize
24KB

Download
memory/4292-3-0x00000000006C0000-0x00000000006C6000-memory.dmp

Filesize
24KB

Download
memory/4292-2-0x00000000021C0000-0x00000000021C6000-memory.dmp

Filesize
24KB

Download
memory/4292-17-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download