a03bf43d451264ed1062dd8a13cc3d5653b88b6a133c4de1563fd1811bc5d860

Analysis

max time kernel
152s
max time network
156s
platform
windows10-2004_x64
resource
win10v2004-20240226-en
resource tags

arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system
submitted
11-04-2024 05:29

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General

Target

2024-04-11_4c1b1f44c30bf972a2e773eddfa3103f_cryptolocker.exe
Size

37KB
MD5

4c1b1f44c30bf972a2e773eddfa3103f
SHA1

3924cdf1685745abfa0118a503cfd6bc8de6b00e
SHA256

a03bf43d451264ed1062dd8a13cc3d5653b88b6a133c4de1563fd1811bc5d860
SHA512

47d0a679d3117aefb4f2836b598b70f2079cb6c8b238818082fda41140a476756a01750c0bf64132f6397c856db889dabe7f2ff679cc11a1668c8ef260d7ed6a
SSDEEP

384:bM7Q0pjC4GybxMv01d3AcASBQMf6i/zzzcYgUPSzn1KkZCb9q8IujdxNX:b/yC4GyNM01GuQMNXw2PSj1Pqq8B1

Score

9^/10

Malware Config

Signatures

Detection of CryptoLocker Variants 1 IoCs

resource	yara_rule
behavioral2/files/0x0008000000023208-12.dat	CryptoLocker_rule2

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-1-5-21-3045580317-3728985860-206385570-1000\Control Panel\International\Geo\Nation	2024-04-11_4c1b1f44c30bf972a2e773eddfa3103f_cryptolocker.exe

Executes dropped EXE 1 IoCs

pid	Process
2740	retln.exe

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 4808 wrote to memory of 2740	4808	2024-04-11_4c1b1f44c30bf972a2e773eddfa3103f_cryptolocker.exe	84
PID 4808 wrote to memory of 2740	4808	2024-04-11_4c1b1f44c30bf972a2e773eddfa3103f_cryptolocker.exe	84
PID 4808 wrote to memory of 2740	4808	2024-04-11_4c1b1f44c30bf972a2e773eddfa3103f_cryptolocker.exe	84

C:\Users\Admin\AppData\Local\Temp\2024-04-11_4c1b1f44c30bf972a2e773eddfa3103f_cryptolocker.exe
"C:\Users\Admin\AppData\Local\Temp\2024-04-11_4c1b1f44c30bf972a2e773eddfa3103f_cryptolocker.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:4808
- C:\Users\Admin\AppData\Local\Temp\retln.exe
  "C:\Users\Admin\AppData\Local\Temp\retln.exe"
  2⤵
  - Executes dropped EXE
  PID:2740

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\retln.exe

Filesize
38KB

MD5
fd9475dd07c2fdf04cf59e26a8a031b9

SHA1
40951b9b0e87a00b204a64143fc1fd8b26db02a4

SHA256
627fe0b5c23355d2217a5c1fde551ef9b5af71e07cb34487e9a2842ff02553b8

SHA512
00bb9c28fe6819708ba60af481f87f4a5e1849191dfcb1bba4eb3914f72c8904d93a8fe6796277d41df662dff12f505225b3bf6b7afb74d445d4db571822c0e9

Download Submit
memory/2740-20-0x0000000002010000-0x0000000002016000-memory.dmp

Filesize
24KB

Download
memory/4808-0-0x00000000022C0000-0x00000000022C6000-memory.dmp

Filesize
24KB

Download
memory/4808-1-0x00000000022C0000-0x00000000022C6000-memory.dmp

Filesize
24KB

Download
memory/4808-2-0x0000000000400000-0x0000000000406000-memory.dmp

Filesize
24KB

Download