4b3189a309ae3c4ee28b2869b7f942bf5c51a35fe2452d39e8c00eb811d36768

Analysis

max time kernel
142s
max time network
160s
platform
windows10-2004_x64
resource
win10v2004-20231215-en
resource tags

arch:x64arch:x86image:win10v2004-20231215-enlocale:en-usos:windows10-2004-x64system
submitted
27-01-2024 13:50

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General

Target

2024-01-27_cd17d8a9d51af10f1f8e3616dd8fc430_cryptolocker.exe
Size

115KB
MD5

cd17d8a9d51af10f1f8e3616dd8fc430
SHA1

c4f7c9ed20f1bb12c942e4dfe53858fd086b37bb
SHA256

4b3189a309ae3c4ee28b2869b7f942bf5c51a35fe2452d39e8c00eb811d36768
SHA512

545bc6a1a8eca82cdbbac61090ca60646c0aac3266b38f25b92caa9a110a23dd515f68cff2c031a028ea68aa73d09685db941cfb2d31ebac3a75840613802441
SSDEEP

1536:T6QFElP6n+gxmddpMOtEvwDpjCGYQbN/PKwNgerar/g:T6a+rdOOtEvwDpjLzh

Score

9^/10

upx

Malware Config

Signatures

Detection of CryptoLocker Variants 4 IoCs

resource	yara_rule
behavioral2/memory/4996-0-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2
behavioral2/files/0x00080000000231e9-13.dat	CryptoLocker_rule2
behavioral2/memory/4996-17-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2
behavioral2/memory/1936-26-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2

Detection of Cryptolocker Samples 4 IoCs

resource	yara_rule
behavioral2/memory/4996-0-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1
behavioral2/files/0x00080000000231e9-13.dat	CryptoLocker_set1
behavioral2/memory/4996-17-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1
behavioral2/memory/1936-26-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1

UPX dump on OEP (original entry point) 4 IoCs

resource	yara_rule
behavioral2/memory/4996-0-0x0000000000500000-0x0000000000510000-memory.dmp	UPX
behavioral2/files/0x00080000000231e9-13.dat	UPX
behavioral2/memory/4996-17-0x0000000000500000-0x0000000000510000-memory.dmp	UPX
behavioral2/memory/1936-26-0x0000000000500000-0x0000000000510000-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-1-5-21-3791175113-1062217823-1177695025-1000\Control Panel\International\Geo\Nation	2024-01-27_cd17d8a9d51af10f1f8e3616dd8fc430_cryptolocker.exe

Executes dropped EXE 1 IoCs

pid	Process
1936	asih.exe

UPX packed file 4 IoCs

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

upx

resource	yara_rule
behavioral2/memory/4996-0-0x0000000000500000-0x0000000000510000-memory.dmp	upx
behavioral2/files/0x00080000000231e9-13.dat	upx
behavioral2/memory/4996-17-0x0000000000500000-0x0000000000510000-memory.dmp	upx
behavioral2/memory/1936-26-0x0000000000500000-0x0000000000510000-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 4996 wrote to memory of 1936	4996	2024-01-27_cd17d8a9d51af10f1f8e3616dd8fc430_cryptolocker.exe	86
PID 4996 wrote to memory of 1936	4996	2024-01-27_cd17d8a9d51af10f1f8e3616dd8fc430_cryptolocker.exe	86
PID 4996 wrote to memory of 1936	4996	2024-01-27_cd17d8a9d51af10f1f8e3616dd8fc430_cryptolocker.exe	86

C:\Users\Admin\AppData\Local\Temp\2024-01-27_cd17d8a9d51af10f1f8e3616dd8fc430_cryptolocker.exe
"C:\Users\Admin\AppData\Local\Temp\2024-01-27_cd17d8a9d51af10f1f8e3616dd8fc430_cryptolocker.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:4996
- C:\Users\Admin\AppData\Local\Temp\asih.exe
  "C:\Users\Admin\AppData\Local\Temp\asih.exe"
  2⤵
  - Executes dropped EXE
  PID:1936

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
116KB

MD5
79bc2f1fee287fa89ebe3be81d97c48f

SHA1
c3c8d74cd0c29d6dd54f6cfac256668d3c4eb0e0

SHA256
141a6b036e6c11c88fe6d6060b707a01693b4dd2775dc8f33e59f82510454558

SHA512
c6b71cb2d42d2d53e523ceaadca74c75760f56f0bc836733abb86ea6e56d53727344684d318e67db2c5f70db842daea86906eb6d71161900117a1ba2c6cff237

Download Submit
memory/1936-19-0x00000000004F0000-0x00000000004F6000-memory.dmp

Filesize
24KB

Download
memory/1936-20-0x00000000004D0000-0x00000000004D6000-memory.dmp

Filesize
24KB

Download
memory/1936-26-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download
memory/4996-0-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download
memory/4996-1-0x0000000000520000-0x0000000000526000-memory.dmp

Filesize
24KB

Download
memory/4996-2-0x0000000000520000-0x0000000000526000-memory.dmp

Filesize
24KB

Download
memory/4996-3-0x0000000000550000-0x0000000000556000-memory.dmp

Filesize
24KB

Download
memory/4996-17-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download