bc58314fc11e30385c3ce385c58428444de9c317e3c6149f8f1bfafef788c661

Analysis

max time kernel
150s
max time network
165s
platform
windows10-2004_x64
resource
win10v2004-20240226-en
resource tags

arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system
submitted
28/02/2024, 15:37

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General

Target

2024-02-28_4cfcaf857a67ea88e94df83c14851226_cryptolocker.exe
Size

104KB
MD5

4cfcaf857a67ea88e94df83c14851226
SHA1

1fcdd14f7627ec05be1c3619ac8cf8e05604ddd4
SHA256

bc58314fc11e30385c3ce385c58428444de9c317e3c6149f8f1bfafef788c661
SHA512

c4d81925539da667786ecd8630023b1fc60f06d9ad196ee8f440d7219cc062b0ea5be92c1f13ce55f9c59fcbcbb86495aef24d777aa1cdc60f7052c0ee1a8ac8
SSDEEP

1536:P8mnK6QFElP6n+gymddpMOtEvwDpjIHsalRn5iF1j6GksU:1nK6a+qdOOtEvwDpjU

Score

9^/10

upx

Malware Config

Signatures

Detection of CryptoLocker Variants 4 IoCs

resource	yara_rule
behavioral2/memory/1636-0-0x0000000000500000-0x000000000050F311-memory.dmp	CryptoLocker_rule2
behavioral2/files/0x0007000000023228-13.dat	CryptoLocker_rule2
behavioral2/memory/1636-17-0x0000000000500000-0x000000000050F311-memory.dmp	CryptoLocker_rule2
behavioral2/memory/2620-26-0x0000000000500000-0x000000000050F311-memory.dmp	CryptoLocker_rule2

Detection of Cryptolocker Samples 4 IoCs

resource	yara_rule
behavioral2/memory/1636-0-0x0000000000500000-0x000000000050F311-memory.dmp	CryptoLocker_set1
behavioral2/files/0x0007000000023228-13.dat	CryptoLocker_set1
behavioral2/memory/1636-17-0x0000000000500000-0x000000000050F311-memory.dmp	CryptoLocker_set1
behavioral2/memory/2620-26-0x0000000000500000-0x000000000050F311-memory.dmp	CryptoLocker_set1

UPX dump on OEP (original entry point) 4 IoCs

resource	yara_rule
behavioral2/memory/1636-0-0x0000000000500000-0x000000000050F311-memory.dmp	UPX
behavioral2/files/0x0007000000023228-13.dat	UPX
behavioral2/memory/1636-17-0x0000000000500000-0x000000000050F311-memory.dmp	UPX
behavioral2/memory/2620-26-0x0000000000500000-0x000000000050F311-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-1-5-21-3045580317-3728985860-206385570-1000\Control Panel\International\Geo\Nation	2024-02-28_4cfcaf857a67ea88e94df83c14851226_cryptolocker.exe

Executes dropped EXE 1 IoCs

pid	Process
2620	asih.exe

UPX packed file 4 IoCs

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

upx

resource	yara_rule
behavioral2/memory/1636-0-0x0000000000500000-0x000000000050F311-memory.dmp	upx
behavioral2/files/0x0007000000023228-13.dat	upx
behavioral2/memory/1636-17-0x0000000000500000-0x000000000050F311-memory.dmp	upx
behavioral2/memory/2620-26-0x0000000000500000-0x000000000050F311-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 1636 wrote to memory of 2620	1636	2024-02-28_4cfcaf857a67ea88e94df83c14851226_cryptolocker.exe	90
PID 1636 wrote to memory of 2620	1636	2024-02-28_4cfcaf857a67ea88e94df83c14851226_cryptolocker.exe	90
PID 1636 wrote to memory of 2620	1636	2024-02-28_4cfcaf857a67ea88e94df83c14851226_cryptolocker.exe	90

C:\Users\Admin\AppData\Local\Temp\2024-02-28_4cfcaf857a67ea88e94df83c14851226_cryptolocker.exe
"C:\Users\Admin\AppData\Local\Temp\2024-02-28_4cfcaf857a67ea88e94df83c14851226_cryptolocker.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:1636
- C:\Users\Admin\AppData\Local\Temp\asih.exe
  "C:\Users\Admin\AppData\Local\Temp\asih.exe"
  2⤵
  - Executes dropped EXE
  PID:2620

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
a559edfaacc455821b11dd9f51a517e5

SHA1
fcd029959c8b49ce2821f9ce79e556c12962c743

SHA256
a3ff708676f87eff7e69eb070a2d8138cd83eee4688dca9e8ef7012d48a5be48

SHA512
face3e4750750e9c5f054418c523a1f1503965cbff7576183723e1c068f22fcabd76572207c7e8111ede811c70d2c3dfcf1bb2a3cc7a71938448d3df5d33a5fe

Download Submit
memory/1636-0-0x0000000000500000-0x000000000050F311-memory.dmp

Filesize
60KB

Download
memory/1636-1-0x00000000005B0000-0x00000000005B6000-memory.dmp

Filesize
24KB

Download
memory/1636-2-0x00000000005B0000-0x00000000005B6000-memory.dmp

Filesize
24KB

Download
memory/1636-3-0x00000000005D0000-0x00000000005D6000-memory.dmp

Filesize
24KB

Download
memory/1636-17-0x0000000000500000-0x000000000050F311-memory.dmp

Filesize
60KB

Download
memory/2620-19-0x00000000006C0000-0x00000000006C6000-memory.dmp

Filesize
24KB

Download
memory/2620-25-0x00000000006A0000-0x00000000006A6000-memory.dmp

Filesize
24KB

Download
memory/2620-26-0x0000000000500000-0x000000000050F311-memory.dmp

Filesize
60KB

Download