b2ad355f0f731a1bd2a879229d1d26c03692e8b8b9a9e4b1bd15489c03f20265

Analysis

max time kernel
150s
max time network
150s
platform
windows10-2004_x64
resource
win10v2004-20240419-en
resource tags

arch:x64arch:x86image:win10v2004-20240419-enlocale:en-usos:windows10-2004-x64system
submitted
28-04-2024 03:55

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General

Target

2024-04-28_edfa89c3010ca09184be57f88d0d51da_cryptolocker.exe
Size

42KB
MD5

edfa89c3010ca09184be57f88d0d51da
SHA1

a7a33e23d9995af22518a388e4ba9bc8f29961a6
SHA256

b2ad355f0f731a1bd2a879229d1d26c03692e8b8b9a9e4b1bd15489c03f20265
SHA512

b682020cb3a085d80c761939cb01d990393fc9903fa25bcb2aa9a1bcb5922557a5770eb8820ebc917836faa29dbf9e410c0696c9d64f5586b197c1910d60d89a
SSDEEP

768:bCDOw9UiaKHfjnD0S16avdrQFiLjJvtAHa:bCDOw9aMDooc+vA6

Score

9^/10

Malware Config

Signatures

Detection of CryptoLocker Variants 4 IoCs

resource	yara_rule
behavioral2/memory/384-0-0x0000000008000000-0x000000000800A000-memory.dmp	CryptoLocker_rule2
behavioral2/files/0x000c000000023b3d-13.dat	CryptoLocker_rule2
behavioral2/memory/384-17-0x0000000008000000-0x000000000800A000-memory.dmp	CryptoLocker_rule2
behavioral2/memory/4840-26-0x0000000008000000-0x000000000800A000-memory.dmp	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-1-5-21-877519540-908060166-1852957295-1000\Control Panel\International\Geo\Nation	2024-04-28_edfa89c3010ca09184be57f88d0d51da_cryptolocker.exe

Executes dropped EXE 1 IoCs

pid	Process
4840	lossy.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 384 wrote to memory of 4840	384	2024-04-28_edfa89c3010ca09184be57f88d0d51da_cryptolocker.exe	84
PID 384 wrote to memory of 4840	384	2024-04-28_edfa89c3010ca09184be57f88d0d51da_cryptolocker.exe	84
PID 384 wrote to memory of 4840	384	2024-04-28_edfa89c3010ca09184be57f88d0d51da_cryptolocker.exe	84

C:\Users\Admin\AppData\Local\Temp\2024-04-28_edfa89c3010ca09184be57f88d0d51da_cryptolocker.exe
"C:\Users\Admin\AppData\Local\Temp\2024-04-28_edfa89c3010ca09184be57f88d0d51da_cryptolocker.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:384
- C:\Users\Admin\AppData\Local\Temp\lossy.exe
  "C:\Users\Admin\AppData\Local\Temp\lossy.exe"
  2⤵
  - Executes dropped EXE
  PID:4840

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\lossy.exe

Filesize
42KB

MD5
286f6a65fccd38702720ecb0038ea24b

SHA1
f7b1c427dec12c3048d4089b2dcfccc8cbf418c3

SHA256
4f73430677554526067287d473a58535cee9ec435ad4892851890bd4eb75b561

SHA512
1db07e1af932cd1cdee72879b8e3f2e5a786a74344aa3bdd66aed7e1e98c1f5ef6db2bde5b432d054bf9e4c25fae86914148408f67d8ae6111ff1102b6fabe96

Download Submit
memory/384-0-0x0000000008000000-0x000000000800A000-memory.dmp

Filesize
40KB

Download
memory/384-1-0x0000000001FC0000-0x0000000001FC6000-memory.dmp

Filesize
24KB

Download
memory/384-2-0x0000000001FF0000-0x0000000001FF6000-memory.dmp

Filesize
24KB

Download
memory/384-9-0x0000000001FC0000-0x0000000001FC6000-memory.dmp

Filesize
24KB

Download
memory/384-17-0x0000000008000000-0x000000000800A000-memory.dmp

Filesize
40KB

Download
memory/4840-19-0x0000000002070000-0x0000000002076000-memory.dmp

Filesize
24KB

Download
memory/4840-25-0x0000000001F40000-0x0000000001F46000-memory.dmp

Filesize
24KB

Download
memory/4840-26-0x0000000008000000-0x000000000800A000-memory.dmp

Filesize
40KB

Download