21b9dbacd7d1515d8ba912afa9c31af1c3f90317969c90b986e55a56164d4d63

Analysis

max time kernel
150s
max time network
152s
platform
windows10-2004_x64
resource
win10v2004-20240426-en
resource tags

arch:x64arch:x86image:win10v2004-20240426-enlocale:en-usos:windows10-2004-x64system
submitted
24-05-2024 04:29

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General

Target

2024-05-24_55f9d53e1465b238b40ac2e0879e5ce6_cryptolocker.exe
Size

41KB
MD5

55f9d53e1465b238b40ac2e0879e5ce6
SHA1

5ab7e163d8958172e4a601345a588061a9379da0
SHA256

21b9dbacd7d1515d8ba912afa9c31af1c3f90317969c90b986e55a56164d4d63
SHA512

7ae1fcd3ac5ff13dbd84cedc99ad83a9468ac94b0589b1e8f30f7be937b104a51cd744da89da1dba8480f2cb386638616181dac3461ceb532a8d2d955f102fac
SSDEEP

384:ba74uGLLQRcsdeQ72ngEr4K7YmE8j6CQYnrz1ZhdaXFXSCVQTLfjDpXqxKHO:ba74zYcgT/EkdCQgpwXFXSqQXfj0xKu

Score

9^/10

upx

Malware Config

Signatures

Detection of CryptoLocker Variants 5 IoCs

Processes:

resource	yara_rule
behavioral2/memory/4628-0-0x0000000008000000-0x000000000800F000-memory.dmp	CryptoLocker_rule2
C:\Users\Admin\AppData\Local\Temp\hasfj.exe	CryptoLocker_rule2
behavioral2/memory/4164-16-0x0000000008000000-0x000000000800F000-memory.dmp	CryptoLocker_rule2
behavioral2/memory/4628-17-0x0000000008000000-0x000000000800F000-memory.dmp	CryptoLocker_rule2
behavioral2/memory/4164-27-0x0000000008000000-0x000000000800F000-memory.dmp	CryptoLocker_rule2

UPX dump on OEP (original entry point) 5 IoCs

Processes:

resource	yara_rule
behavioral2/memory/4628-0-0x0000000008000000-0x000000000800F000-memory.dmp	UPX
C:\Users\Admin\AppData\Local\Temp\hasfj.exe	UPX
behavioral2/memory/4164-16-0x0000000008000000-0x000000000800F000-memory.dmp	UPX
behavioral2/memory/4628-17-0x0000000008000000-0x000000000800F000-memory.dmp	UPX
behavioral2/memory/4164-27-0x0000000008000000-0x000000000800F000-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:

2024-05-24_55f9d53e1465b238b40ac2e0879e5ce6_cryptolocker.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-540404634-651139247-2967210625-1000\Control Panel\International\Geo\Nation	2024-05-24_55f9d53e1465b238b40ac2e0879e5ce6_cryptolocker.exe

Executes dropped EXE 1 IoCs

Processes:

hasfj.exe

pid process

4164 hasfj.exe

pid	process
4164	hasfj.exe

UPX packed file 5 IoCs

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

upx

Processes:

resource	yara_rule
behavioral2/memory/4628-0-0x0000000008000000-0x000000000800F000-memory.dmp	upx
C:\Users\Admin\AppData\Local\Temp\hasfj.exe	upx
behavioral2/memory/4164-16-0x0000000008000000-0x000000000800F000-memory.dmp	upx
behavioral2/memory/4628-17-0x0000000008000000-0x000000000800F000-memory.dmp	upx
behavioral2/memory/4164-27-0x0000000008000000-0x000000000800F000-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:

2024-05-24_55f9d53e1465b238b40ac2e0879e5ce6_cryptolocker.exe

description	pid	process	target process
PID 4628 wrote to memory of 4164	4628	2024-05-24_55f9d53e1465b238b40ac2e0879e5ce6_cryptolocker.exe	hasfj.exe
PID 4628 wrote to memory of 4164	4628	2024-05-24_55f9d53e1465b238b40ac2e0879e5ce6_cryptolocker.exe	hasfj.exe
PID 4628 wrote to memory of 4164	4628	2024-05-24_55f9d53e1465b238b40ac2e0879e5ce6_cryptolocker.exe	hasfj.exe

C:\Users\Admin\AppData\Local\Temp\2024-05-24_55f9d53e1465b238b40ac2e0879e5ce6_cryptolocker.exe
"C:\Users\Admin\AppData\Local\Temp\2024-05-24_55f9d53e1465b238b40ac2e0879e5ce6_cryptolocker.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:4628

C:\Users\Admin\AppData\Local\Temp\hasfj.exe
"C:\Users\Admin\AppData\Local\Temp\hasfj.exe"
2⤵
- Executes dropped EXE
PID:4164

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\hasfj.exe
Filesize
41KB

MD5
f3c37770bfce639d0fde52feecd0281f

SHA1
366a94adbd961d142cfae65480b26703619393d9

SHA256
e64e28c21d3b7fd9019658f0b14e582c2c73047a772378fd747866ff061c56ac

SHA512
9647014116e5e4d943e4e1498be387587a8f2f6e96ea0bd59cf41308811efcf8b5b1dce2af46883422cdd4cc5321e0e93286d132f39fae0cd4196d0e7b617ba0

Download Submit
memory/4164-16-0x0000000008000000-0x000000000800F000-memory.dmp

Filesize
60KB

Download
memory/4164-20-0x0000000002280000-0x0000000002286000-memory.dmp

Filesize
24KB

Download
memory/4164-26-0x0000000002210000-0x0000000002216000-memory.dmp

Filesize
24KB

Download
memory/4164-27-0x0000000008000000-0x000000000800F000-memory.dmp

Filesize
60KB

Download
memory/4628-0-0x0000000008000000-0x000000000800F000-memory.dmp

Filesize
60KB

Download
memory/4628-1-0x0000000002EA0000-0x0000000002EA6000-memory.dmp

Filesize
24KB

Download
memory/4628-2-0x0000000003150000-0x0000000003156000-memory.dmp

Filesize
24KB

Download
memory/4628-9-0x0000000002EA0000-0x0000000002EA6000-memory.dmp

Filesize
24KB

Download
memory/4628-17-0x0000000008000000-0x000000000800F000-memory.dmp

Filesize
60KB

Download