49bffbc03129499d7f4191e8ae42e80f73dc5df9ac6b14a40dcf082cdaf65413

Analysis

max time kernel
148s
max time network
150s
platform
windows10-2004_x64
resource
win10v2004-20240508-en
resource tags

arch:x64arch:x86image:win10v2004-20240508-enlocale:en-usos:windows10-2004-x64system
submitted
23/05/2024, 21:44

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General

Target

2024-05-23_f4d61a608a2356767c615b09c2b80957_cryptolocker.exe
Size

69KB
MD5

f4d61a608a2356767c615b09c2b80957
SHA1

c8b45521c7a9746f73233ea3939bf74d1b53478f
SHA256

49bffbc03129499d7f4191e8ae42e80f73dc5df9ac6b14a40dcf082cdaf65413
SHA512

8585557e9d4c309f0f0c99e72546b080c4467f22ca1ddde3f058c5b8fe1fadc9bc63a570e184efd0177f79d5900d895e557fbfe4dd0c6a414e5f126304ecbf26
SSDEEP

768:quVbxjgQNQXtckstOOtEvwDpjAaDOK6PsED3VK2+ZtyOjgO4r9vFAg2rq6W1A1PJ:quJu9cvMOtEvwDpjWYTjipvF2bx1PQAJ

Score

9^/10

upx

Malware Config

Signatures

Detection of CryptoLocker Variants 4 IoCs

resource	yara_rule
behavioral2/memory/1772-0-0x0000000000500000-0x000000000050F000-memory.dmp	CryptoLocker_rule2
behavioral2/files/0x00070000000232a4-13.dat	CryptoLocker_rule2
behavioral2/memory/1772-18-0x0000000000500000-0x000000000050F000-memory.dmp	CryptoLocker_rule2
behavioral2/memory/3948-27-0x0000000000500000-0x000000000050F000-memory.dmp	CryptoLocker_rule2

Detection of Cryptolocker Samples 4 IoCs

resource	yara_rule
behavioral2/memory/1772-0-0x0000000000500000-0x000000000050F000-memory.dmp	CryptoLocker_set1
behavioral2/files/0x00070000000232a4-13.dat	CryptoLocker_set1
behavioral2/memory/1772-18-0x0000000000500000-0x000000000050F000-memory.dmp	CryptoLocker_set1
behavioral2/memory/3948-27-0x0000000000500000-0x000000000050F000-memory.dmp	CryptoLocker_set1

UPX dump on OEP (original entry point) 4 IoCs

resource	yara_rule
behavioral2/memory/1772-0-0x0000000000500000-0x000000000050F000-memory.dmp	UPX
behavioral2/files/0x00070000000232a4-13.dat	UPX
behavioral2/memory/1772-18-0x0000000000500000-0x000000000050F000-memory.dmp	UPX
behavioral2/memory/3948-27-0x0000000000500000-0x000000000050F000-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

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-2804150937-2146708401-419095071-1000\Control Panel\International\Geo\Nation	2024-05-23_f4d61a608a2356767c615b09c2b80957_cryptolocker.exe

Executes dropped EXE 1 IoCs

pid	Process
3948	asih.exe

UPX packed file 4 IoCs

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

upx

resource	yara_rule
behavioral2/memory/1772-0-0x0000000000500000-0x000000000050F000-memory.dmp	upx
behavioral2/files/0x00070000000232a4-13.dat	upx
behavioral2/memory/1772-18-0x0000000000500000-0x000000000050F000-memory.dmp	upx
behavioral2/memory/3948-27-0x0000000000500000-0x000000000050F000-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

description	pid	Process	procid_target
PID 1772 wrote to memory of 3948	1772	2024-05-23_f4d61a608a2356767c615b09c2b80957_cryptolocker.exe	83
PID 1772 wrote to memory of 3948	1772	2024-05-23_f4d61a608a2356767c615b09c2b80957_cryptolocker.exe	83
PID 1772 wrote to memory of 3948	1772	2024-05-23_f4d61a608a2356767c615b09c2b80957_cryptolocker.exe	83

C:\Users\Admin\AppData\Local\Temp\2024-05-23_f4d61a608a2356767c615b09c2b80957_cryptolocker.exe
"C:\Users\Admin\AppData\Local\Temp\2024-05-23_f4d61a608a2356767c615b09c2b80957_cryptolocker.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:1772
- C:\Users\Admin\AppData\Local\Temp\asih.exe
  "C:\Users\Admin\AppData\Local\Temp\asih.exe"
  2⤵
  - Executes dropped EXE
  PID:3948

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
69KB

MD5
f18429801f725ceacff835dc92d6710a

SHA1
2acea50136e0cf00fbfc96f3bf700b69fbc9bfa4

SHA256
22ee484d1c81b20e3cd8308768d45ad7b3756994a7f1b96c536a6b48ddd6b0fa

SHA512
16a24446e0d1f2896f1398538f7d89a60b07918513c3d91cff791a75967d324f1aace1953404bd3cf227b267b918c1d2c04ef5f5baa17b9e3ca3ee72c35113a3

Download Submit
memory/1772-0-0x0000000000500000-0x000000000050F000-memory.dmp

Filesize
60KB

Download
memory/1772-1-0x00000000005A0000-0x00000000005A6000-memory.dmp

Filesize
24KB

Download
memory/1772-2-0x00000000005C0000-0x00000000005C6000-memory.dmp

Filesize
24KB

Download
memory/1772-9-0x00000000005A0000-0x00000000005A6000-memory.dmp

Filesize
24KB

Download
memory/1772-18-0x0000000000500000-0x000000000050F000-memory.dmp

Filesize
60KB

Download
memory/3948-20-0x0000000000680000-0x0000000000686000-memory.dmp

Filesize
24KB

Download
memory/3948-26-0x0000000000560000-0x0000000000566000-memory.dmp

Filesize
24KB

Download
memory/3948-27-0x0000000000500000-0x000000000050F000-memory.dmp

Filesize
60KB

Download