45404abe43696c3f8e93cad1bcb2ab476ef4c71473fd6ba0b05e6407d9c47d44

Analysis

max time kernel
148s
max time network
149s
platform
windows10-2004_x64
resource
win10v2004-20231222-en
resource tags

arch:x64arch:x86image:win10v2004-20231222-enlocale:en-usos:windows10-2004-x64system
submitted
12-02-2024 20:01

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General

Target

2024-02-12_2b9317ce1ff64ac9e92a035733c1b2a5_cryptolocker.exe
Size

85KB
MD5

2b9317ce1ff64ac9e92a035733c1b2a5
SHA1

844ced38c37023fb7243e35c72062c3d41b5ef87
SHA256

45404abe43696c3f8e93cad1bcb2ab476ef4c71473fd6ba0b05e6407d9c47d44
SHA512

0f3d2ba45a48d4133b9431dd8a038cc49f3ab27b22dea716d1dcba76669da757a30a8f513590cb1580b9c3ae3fb5a6cc855387bab2ebfc0b77ddba44605cd82e
SSDEEP

768:qkmnjFom/kLyMro2GtOOtEvwDpjeY10Y/YMsvlMdwPK80GQuchoIgtIJWV:qkmnpomddpMOtEvwDpjJGYQbN/PKwMgB

Score

9^/10

upx

Malware Config

Signatures

Detection of CryptoLocker Variants 5 IoCs

Processes:

resource	yara_rule
behavioral2/memory/2628-0-0x0000000000500000-0x000000000050F000-memory.dmp	CryptoLocker_rule2
C:\Users\Admin\AppData\Local\Temp\asih.exe	CryptoLocker_rule2
behavioral2/memory/2628-17-0x0000000000500000-0x000000000050F000-memory.dmp	CryptoLocker_rule2
behavioral2/memory/2448-18-0x0000000000500000-0x000000000050F000-memory.dmp	CryptoLocker_rule2
behavioral2/memory/2448-27-0x0000000000500000-0x000000000050F000-memory.dmp	CryptoLocker_rule2

Detection of Cryptolocker Samples 5 IoCs

Processes:

resource	yara_rule
behavioral2/memory/2628-0-0x0000000000500000-0x000000000050F000-memory.dmp	CryptoLocker_set1
C:\Users\Admin\AppData\Local\Temp\asih.exe	CryptoLocker_set1
behavioral2/memory/2628-17-0x0000000000500000-0x000000000050F000-memory.dmp	CryptoLocker_set1
behavioral2/memory/2448-18-0x0000000000500000-0x000000000050F000-memory.dmp	CryptoLocker_set1
behavioral2/memory/2448-27-0x0000000000500000-0x000000000050F000-memory.dmp	CryptoLocker_set1

UPX dump on OEP (original entry point) 5 IoCs

Processes:

resource	yara_rule
behavioral2/memory/2628-0-0x0000000000500000-0x000000000050F000-memory.dmp	UPX
C:\Users\Admin\AppData\Local\Temp\asih.exe	UPX
behavioral2/memory/2628-17-0x0000000000500000-0x000000000050F000-memory.dmp	UPX
behavioral2/memory/2448-18-0x0000000000500000-0x000000000050F000-memory.dmp	UPX
behavioral2/memory/2448-27-0x0000000000500000-0x000000000050F000-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:

2024-02-12_2b9317ce1ff64ac9e92a035733c1b2a5_cryptolocker.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-1168293393-3419776239-306423207-1000\Control Panel\International\Geo\Nation	2024-02-12_2b9317ce1ff64ac9e92a035733c1b2a5_cryptolocker.exe

Executes dropped EXE 1 IoCs

Processes:

asih.exe

pid process

2448 asih.exe

pid	process
2448	asih.exe

UPX packed file 5 IoCs

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

upx

Processes:

resource	yara_rule
behavioral2/memory/2628-0-0x0000000000500000-0x000000000050F000-memory.dmp	upx
C:\Users\Admin\AppData\Local\Temp\asih.exe	upx
behavioral2/memory/2628-17-0x0000000000500000-0x000000000050F000-memory.dmp	upx
behavioral2/memory/2448-18-0x0000000000500000-0x000000000050F000-memory.dmp	upx
behavioral2/memory/2448-27-0x0000000000500000-0x000000000050F000-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:

2024-02-12_2b9317ce1ff64ac9e92a035733c1b2a5_cryptolocker.exe

description	pid	process	target process
PID 2628 wrote to memory of 2448	2628	2024-02-12_2b9317ce1ff64ac9e92a035733c1b2a5_cryptolocker.exe	asih.exe
PID 2628 wrote to memory of 2448	2628	2024-02-12_2b9317ce1ff64ac9e92a035733c1b2a5_cryptolocker.exe	asih.exe
PID 2628 wrote to memory of 2448	2628	2024-02-12_2b9317ce1ff64ac9e92a035733c1b2a5_cryptolocker.exe	asih.exe

C:\Users\Admin\AppData\Local\Temp\2024-02-12_2b9317ce1ff64ac9e92a035733c1b2a5_cryptolocker.exe
"C:\Users\Admin\AppData\Local\Temp\2024-02-12_2b9317ce1ff64ac9e92a035733c1b2a5_cryptolocker.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:2628

C:\Users\Admin\AppData\Local\Temp\asih.exe
"C:\Users\Admin\AppData\Local\Temp\asih.exe"
2⤵
- Executes dropped EXE
PID:2448

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
86KB

MD5
06b7c977510ef19c6f7cc2b64ecc1f26

SHA1
d401cc0ec56546896acb2a84307e17f0ca3ec23f

SHA256
eb177b900aac1468d3db73052cd6348eebd51c1a7a7817e6eee8f1ea765060fd

SHA512
7b294b94a88664025135790a1506b27778fc28b18d5deb642a3aebeaffa24e05e10573c9fcf5e38639fb3875a52f40e6b1cc2d4eb8d304a765fad77eb833d4e7

Download Submit
memory/2448-18-0x0000000000500000-0x000000000050F000-memory.dmp

Filesize
60KB

Download
memory/2448-21-0x00000000005E0000-0x00000000005E6000-memory.dmp

Filesize
24KB

Download
memory/2448-20-0x00000000004D0000-0x00000000004D6000-memory.dmp

Filesize
24KB

Download
memory/2448-27-0x0000000000500000-0x000000000050F000-memory.dmp

Filesize
60KB

Download
memory/2628-0-0x0000000000500000-0x000000000050F000-memory.dmp

Filesize
60KB

Download
memory/2628-1-0x0000000000620000-0x0000000000626000-memory.dmp

Filesize
24KB

Download
memory/2628-2-0x0000000000620000-0x0000000000626000-memory.dmp

Filesize
24KB

Download
memory/2628-3-0x0000000000750000-0x0000000000756000-memory.dmp

Filesize
24KB

Download
memory/2628-17-0x0000000000500000-0x000000000050F000-memory.dmp

Filesize
60KB

Download