31098a390af934db3da45f5999937b5044f16afc9bbaba98571f6f0b9b4e3409

Analysis

max time kernel
150s
max time network
151s
platform
windows10-2004_x64
resource
win10v2004-20240226-en
resource tags

arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system
submitted
06-03-2024 14:41

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General

Target

2024-03-06_f1d326ed03b1cb7df5aac3bbfb2a2e62_cryptolocker.exe
Size

105KB
MD5

f1d326ed03b1cb7df5aac3bbfb2a2e62
SHA1

e5fc9f40fa8eaf6c3be2c5c557b5a607107a5ea6
SHA256

31098a390af934db3da45f5999937b5044f16afc9bbaba98571f6f0b9b4e3409
SHA512

bc6e2097e94ffb611368747fd3f575be32679b3fc90fa2b26d477ab7621d3210124f7b977fad971a7be147c0b89dd9a4ceaed7441f12cd99fe14950c8e32ab01
SSDEEP

1536:P8mnK6QFElP6n+gymddpMOtEvwDpjIHsalRn5iF1j6GksyJ:1nK6a+qdOOtEvwDpjyJ

Score

9^/10

upx

Malware Config

Signatures

Detection of CryptoLocker Variants 4 IoCs

resource	yara_rule
behavioral2/memory/1576-0-0x0000000000500000-0x000000000050F311-memory.dmp	CryptoLocker_rule2
behavioral2/files/0x000700000001ebc7-13.dat	CryptoLocker_rule2
behavioral2/memory/1576-17-0x0000000000500000-0x000000000050F311-memory.dmp	CryptoLocker_rule2
behavioral2/memory/700-26-0x0000000000500000-0x000000000050F311-memory.dmp	CryptoLocker_rule2

Detection of Cryptolocker Samples 4 IoCs

resource	yara_rule
behavioral2/memory/1576-0-0x0000000000500000-0x000000000050F311-memory.dmp	CryptoLocker_set1
behavioral2/files/0x000700000001ebc7-13.dat	CryptoLocker_set1
behavioral2/memory/1576-17-0x0000000000500000-0x000000000050F311-memory.dmp	CryptoLocker_set1
behavioral2/memory/700-26-0x0000000000500000-0x000000000050F311-memory.dmp	CryptoLocker_set1

UPX dump on OEP (original entry point) 4 IoCs

resource	yara_rule
behavioral2/memory/1576-0-0x0000000000500000-0x000000000050F311-memory.dmp	UPX
behavioral2/files/0x000700000001ebc7-13.dat	UPX
behavioral2/memory/1576-17-0x0000000000500000-0x000000000050F311-memory.dmp	UPX
behavioral2/memory/700-26-0x0000000000500000-0x000000000050F311-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-1-5-21-566096764-1992588923-1249862864-1000\Control Panel\International\Geo\Nation	2024-03-06_f1d326ed03b1cb7df5aac3bbfb2a2e62_cryptolocker.exe

Executes dropped EXE 1 IoCs

pid	Process
700	asih.exe

UPX packed file 4 IoCs

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

upx

resource	yara_rule
behavioral2/memory/1576-0-0x0000000000500000-0x000000000050F311-memory.dmp	upx
behavioral2/files/0x000700000001ebc7-13.dat	upx
behavioral2/memory/1576-17-0x0000000000500000-0x000000000050F311-memory.dmp	upx
behavioral2/memory/700-26-0x0000000000500000-0x000000000050F311-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 1576 wrote to memory of 700	1576	2024-03-06_f1d326ed03b1cb7df5aac3bbfb2a2e62_cryptolocker.exe	88
PID 1576 wrote to memory of 700	1576	2024-03-06_f1d326ed03b1cb7df5aac3bbfb2a2e62_cryptolocker.exe	88
PID 1576 wrote to memory of 700	1576	2024-03-06_f1d326ed03b1cb7df5aac3bbfb2a2e62_cryptolocker.exe	88

C:\Users\Admin\AppData\Local\Temp\2024-03-06_f1d326ed03b1cb7df5aac3bbfb2a2e62_cryptolocker.exe
"C:\Users\Admin\AppData\Local\Temp\2024-03-06_f1d326ed03b1cb7df5aac3bbfb2a2e62_cryptolocker.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:1576
- C:\Users\Admin\AppData\Local\Temp\asih.exe
  "C:\Users\Admin\AppData\Local\Temp\asih.exe"
  2⤵
  - Executes dropped EXE
  PID:700

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
105KB

MD5
0097a2ed9c380a257d7aebfd2742dc9a

SHA1
87ea776b23dad4de63091db4bfa27108f9ccaf8b

SHA256
14607b08c60e204f7833e11f663ab647f8d6ec3db6c443b10a2e3e67bf6554ec

SHA512
3d716803dc39a7c07e9fe8cf540669bd7d90ef88cec4d396913cfa27ef584e0df351a8279b550d0931bdf7cf86cbace854257318740551462430eee992912931

Download Submit
memory/700-19-0x00000000005D0000-0x00000000005D6000-memory.dmp

Filesize
24KB

Download
memory/700-21-0x0000000000560000-0x0000000000566000-memory.dmp

Filesize
24KB

Download
memory/700-26-0x0000000000500000-0x000000000050F311-memory.dmp

Filesize
60KB

Download
memory/1576-0-0x0000000000500000-0x000000000050F311-memory.dmp

Filesize
60KB

Download
memory/1576-1-0x0000000000590000-0x0000000000596000-memory.dmp

Filesize
24KB

Download
memory/1576-2-0x0000000000590000-0x0000000000596000-memory.dmp

Filesize
24KB

Download
memory/1576-3-0x00000000006B0000-0x00000000006B6000-memory.dmp

Filesize
24KB

Download
memory/1576-17-0x0000000000500000-0x000000000050F311-memory.dmp

Filesize
60KB

Download