ee1682d3e45b2864dea6a8de5d6904f4e8549fdd16f2bcb5e72954d05e19a9c6

Analysis

max time kernel
149s
max time network
150s
platform
windows10-2004_x64
resource
win10v2004-20240508-en
resource tags

arch:x64arch:x86image:win10v2004-20240508-enlocale:en-usos:windows10-2004-x64system
submitted
23-05-2024 18:18

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General

Target

2024-05-23_bf33dc67557031625b660590e3d985e9_cryptolocker.exe
Size

102KB
MD5

bf33dc67557031625b660590e3d985e9
SHA1

b9b3a3518cc20990d2c7156f109f5bfd022ef53a
SHA256

ee1682d3e45b2864dea6a8de5d6904f4e8549fdd16f2bcb5e72954d05e19a9c6
SHA512

c7c67308c1f21c9febf6fa6b61dc8af006b7585ae59b98a2f15c0d3e5e0f06791445021ddb6d1dc887e0f7f493dc12cb1d1d5e59dcb388582bd42a16537cb512
SSDEEP

1536:qkmnpomddpMOtEvwDpjJGYQbN/PKwNgpwqWsviPeBc6:AnBdOOtEvwDpj6z4

Score

9^/10

upx

Malware Config

Signatures

Detection of CryptoLocker Variants 5 IoCs

Processes:

resource	yara_rule
behavioral2/memory/3948-0-0x0000000000500000-0x000000000050F000-memory.dmp	CryptoLocker_rule2
C:\Users\Admin\AppData\Local\Temp\asih.exe	CryptoLocker_rule2
behavioral2/memory/3948-18-0x0000000000500000-0x000000000050F000-memory.dmp	CryptoLocker_rule2
behavioral2/memory/4208-20-0x0000000000500000-0x000000000050F000-memory.dmp	CryptoLocker_rule2
behavioral2/memory/4208-28-0x0000000000500000-0x000000000050F000-memory.dmp	CryptoLocker_rule2

Detection of Cryptolocker Samples 5 IoCs

Processes:

resource	yara_rule
behavioral2/memory/3948-0-0x0000000000500000-0x000000000050F000-memory.dmp	CryptoLocker_set1
C:\Users\Admin\AppData\Local\Temp\asih.exe	CryptoLocker_set1
behavioral2/memory/3948-18-0x0000000000500000-0x000000000050F000-memory.dmp	CryptoLocker_set1
behavioral2/memory/4208-20-0x0000000000500000-0x000000000050F000-memory.dmp	CryptoLocker_set1
behavioral2/memory/4208-28-0x0000000000500000-0x000000000050F000-memory.dmp	CryptoLocker_set1

UPX dump on OEP (original entry point) 5 IoCs

Processes:

resource	yara_rule
behavioral2/memory/3948-0-0x0000000000500000-0x000000000050F000-memory.dmp	UPX
C:\Users\Admin\AppData\Local\Temp\asih.exe	UPX
behavioral2/memory/3948-18-0x0000000000500000-0x000000000050F000-memory.dmp	UPX
behavioral2/memory/4208-20-0x0000000000500000-0x000000000050F000-memory.dmp	UPX
behavioral2/memory/4208-28-0x0000000000500000-0x000000000050F000-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:

2024-05-23_bf33dc67557031625b660590e3d985e9_cryptolocker.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-1337824034-2731376981-3755436523-1000\Control Panel\International\Geo\Nation	2024-05-23_bf33dc67557031625b660590e3d985e9_cryptolocker.exe

Executes dropped EXE 1 IoCs

Processes:

asih.exe

pid process

4208 asih.exe

pid	process
4208	asih.exe

UPX packed file 5 IoCs

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

upx

Processes:

resource	yara_rule
behavioral2/memory/3948-0-0x0000000000500000-0x000000000050F000-memory.dmp	upx
C:\Users\Admin\AppData\Local\Temp\asih.exe	upx
behavioral2/memory/3948-18-0x0000000000500000-0x000000000050F000-memory.dmp	upx
behavioral2/memory/4208-20-0x0000000000500000-0x000000000050F000-memory.dmp	upx
behavioral2/memory/4208-28-0x0000000000500000-0x000000000050F000-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:

2024-05-23_bf33dc67557031625b660590e3d985e9_cryptolocker.exe

description	pid	process	target process
PID 3948 wrote to memory of 4208	3948	2024-05-23_bf33dc67557031625b660590e3d985e9_cryptolocker.exe	asih.exe
PID 3948 wrote to memory of 4208	3948	2024-05-23_bf33dc67557031625b660590e3d985e9_cryptolocker.exe	asih.exe
PID 3948 wrote to memory of 4208	3948	2024-05-23_bf33dc67557031625b660590e3d985e9_cryptolocker.exe	asih.exe

C:\Users\Admin\AppData\Local\Temp\2024-05-23_bf33dc67557031625b660590e3d985e9_cryptolocker.exe
"C:\Users\Admin\AppData\Local\Temp\2024-05-23_bf33dc67557031625b660590e3d985e9_cryptolocker.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:3948

C:\Users\Admin\AppData\Local\Temp\asih.exe
"C:\Users\Admin\AppData\Local\Temp\asih.exe"
2⤵
- Executes dropped EXE
PID:4208

Network

MITRE ATT&CK Matrix ATT&CK v13

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Resource Development

Reconnaissance

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\asih.exe
Filesize
102KB

MD5
573a0e91076085d665bb063bb2216988

SHA1
111a4117e7a9faa0793fe96f1b31e35bf7e0dd62

SHA256
518df5ed327ed7e9792c8a9491b2449c9936ee11fdb9cc1d7f87798108c6c179

SHA512
0ac4ec02543513b1ff733b57f91dbc3ce797c53db571942f26cea641c1f9d79a372cc701d6528e32c0b646c796368bdb5fffb72f05a08c9930db436f9db2775e

Download Submit
memory/3948-0-0x0000000000500000-0x000000000050F000-memory.dmp

Filesize
60KB

Download
memory/3948-1-0x00000000004E0000-0x00000000004E6000-memory.dmp

Filesize
24KB

Download
memory/3948-2-0x00000000005A0000-0x00000000005A6000-memory.dmp

Filesize
24KB

Download
memory/3948-9-0x00000000004E0000-0x00000000004E6000-memory.dmp

Filesize
24KB

Download
memory/3948-18-0x0000000000500000-0x000000000050F000-memory.dmp

Filesize
60KB

Download
memory/4208-20-0x0000000000500000-0x000000000050F000-memory.dmp

Filesize
60KB

Download
memory/4208-21-0x00000000006E0000-0x00000000006E6000-memory.dmp

Filesize
24KB

Download
memory/4208-27-0x00000000006C0000-0x00000000006C6000-memory.dmp

Filesize
24KB

Download
memory/4208-28-0x0000000000500000-0x000000000050F000-memory.dmp

Filesize
60KB

Download