a078e85bc1ffd483ff9bb7355355d348ac78db0731f1235f4095dfa0fbe5b6af

Analysis

max time kernel
148s
max time network
151s
platform
windows10-2004_x64
resource
win10v2004-20240426-en
resource tags

arch:x64arch:x86image:win10v2004-20240426-enlocale:en-usos:windows10-2004-x64system
submitted
27-04-2024 22:29

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General

Target

2024-04-27_489c396165e46053501f050f6de3ed83_cryptolocker.exe
Size

57KB
MD5

489c396165e46053501f050f6de3ed83
SHA1

56857850431a0d8fd581f45d4ab53fd31bbc2c91
SHA256

a078e85bc1ffd483ff9bb7355355d348ac78db0731f1235f4095dfa0fbe5b6af
SHA512

54a98305315e5964dd0d82416e1800745605dc5b43dc2b9cb47339094a25737a8170dff03d4e0d6029833d1258d3209aee5c3a366e3d58ddd54cd9f35e8e2311
SSDEEP

768:H6LsoEEeegiZPvEhHSG+gk5NQXtckstOOtEvwDpjhBaD3TUogs/VXpAPB2:H6QFElP6n+gou9cvMOtEvwDpjCpVXY2

Score

9^/10

upx

Malware Config

Signatures

Detection of CryptoLocker Variants 5 IoCs

Processes:

resource	yara_rule
behavioral2/memory/4024-0-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2
C:\Users\Admin\AppData\Local\Temp\asih.exe	CryptoLocker_rule2
behavioral2/memory/4300-18-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2
behavioral2/memory/4024-17-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2
behavioral2/memory/4300-27-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2

Detection of Cryptolocker Samples 5 IoCs

Processes:

resource	yara_rule
behavioral2/memory/4024-0-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1
C:\Users\Admin\AppData\Local\Temp\asih.exe	CryptoLocker_set1
behavioral2/memory/4300-18-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1
behavioral2/memory/4024-17-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1
behavioral2/memory/4300-27-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1

UPX dump on OEP (original entry point) 5 IoCs

Processes:

resource	yara_rule
behavioral2/memory/4024-0-0x0000000000500000-0x0000000000510000-memory.dmp	UPX
C:\Users\Admin\AppData\Local\Temp\asih.exe	UPX
behavioral2/memory/4300-18-0x0000000000500000-0x0000000000510000-memory.dmp	UPX
behavioral2/memory/4024-17-0x0000000000500000-0x0000000000510000-memory.dmp	UPX
behavioral2/memory/4300-27-0x0000000000500000-0x0000000000510000-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

Processes:

2024-04-27_489c396165e46053501f050f6de3ed83_cryptolocker.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-4018855536-2201274732-320770143-1000\Control Panel\International\Geo\Nation	2024-04-27_489c396165e46053501f050f6de3ed83_cryptolocker.exe

Executes dropped EXE 1 IoCs

Processes:

asih.exe

pid process

4300 asih.exe

pid	process
4300	asih.exe

UPX packed file 5 IoCs

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

upx

Processes:

resource	yara_rule
behavioral2/memory/4024-0-0x0000000000500000-0x0000000000510000-memory.dmp	upx
C:\Users\Admin\AppData\Local\Temp\asih.exe	upx
behavioral2/memory/4300-18-0x0000000000500000-0x0000000000510000-memory.dmp	upx
behavioral2/memory/4024-17-0x0000000000500000-0x0000000000510000-memory.dmp	upx
behavioral2/memory/4300-27-0x0000000000500000-0x0000000000510000-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

Processes:

2024-04-27_489c396165e46053501f050f6de3ed83_cryptolocker.exe

description	pid	process	target process
PID 4024 wrote to memory of 4300	4024	2024-04-27_489c396165e46053501f050f6de3ed83_cryptolocker.exe	asih.exe
PID 4024 wrote to memory of 4300	4024	2024-04-27_489c396165e46053501f050f6de3ed83_cryptolocker.exe	asih.exe
PID 4024 wrote to memory of 4300	4024	2024-04-27_489c396165e46053501f050f6de3ed83_cryptolocker.exe	asih.exe

C:\Users\Admin\AppData\Local\Temp\2024-04-27_489c396165e46053501f050f6de3ed83_cryptolocker.exe
"C:\Users\Admin\AppData\Local\Temp\2024-04-27_489c396165e46053501f050f6de3ed83_cryptolocker.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:4024

C:\Users\Admin\AppData\Local\Temp\asih.exe
"C:\Users\Admin\AppData\Local\Temp\asih.exe"
2⤵
- Executes dropped EXE
PID:4300

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

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Downloads

C:\Users\Admin\AppData\Local\Temp\asih.exe
Filesize
58KB

MD5
5b12db17b98b5bda2aa1d4fea2b6ebb3

SHA1
cea43c521e7059361c04260e12a4b9eca44f9748

SHA256
1e7380ff6b7c33c850249bd92a3fbe47cb10cd8d8f506b812845212b32262846

SHA512
7b1dac3d6f7e5392f84264c810cd7d7ebe479885966dbee75bd2df04780dd58e4e61c2fcdd03f61f7ab332303fc77f88752c69723dd33320f6fe219af94dd148

Download Submit
memory/4024-0-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download
memory/4024-1-0x00000000004E0000-0x00000000004E6000-memory.dmp

Filesize
24KB

Download
memory/4024-2-0x00000000005E0000-0x00000000005E6000-memory.dmp

Filesize
24KB

Download
memory/4024-9-0x00000000004E0000-0x00000000004E6000-memory.dmp

Filesize
24KB

Download
memory/4024-17-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download
memory/4300-18-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download
memory/4300-26-0x00000000004D0000-0x00000000004D6000-memory.dmp

Filesize
24KB

Download
memory/4300-27-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download