40792b9e867a73eccb2a5dd7b069608c1b33c31755ee310b0b27f6f13e214b62

General

Target

2024-05-24_f85f8aed872b9d76f6e2f7d13fdc4efd_cryptolocker.exe
Size

64KB
MD5

f85f8aed872b9d76f6e2f7d13fdc4efd
SHA1

1b4a3e25ab17d8c94012a56f9e141075deb60f98
SHA256

40792b9e867a73eccb2a5dd7b069608c1b33c31755ee310b0b27f6f13e214b62
SHA512

abb5390c5bf3e90cb5082d3416194818da6169ddf4f6532c291978c263cd447d8891a3af1f6b7381cba05429330d4d4288b8ef5e562092a1f62c37c9138b9826
SSDEEP

1536:P8mnK6QFElP6n+gymddpMOtEvwDpjYZ8xK:1nK6a+qdOOtEvwDpjA

Score

9^/10

upx

Malware Config

Signatures

Detection of CryptoLocker Variants 5 IoCs

Processes:

resource	yara_rule
behavioral2/memory/1056-0-0x0000000000500000-0x000000000050F311-memory.dmp	CryptoLocker_rule2
C:\Users\Admin\AppData\Local\Temp\asih.exe	CryptoLocker_rule2
behavioral2/memory/1056-17-0x0000000000500000-0x000000000050F311-memory.dmp	CryptoLocker_rule2
behavioral2/memory/3672-18-0x0000000000500000-0x000000000050F311-memory.dmp	CryptoLocker_rule2
behavioral2/memory/3672-27-0x0000000000500000-0x000000000050F311-memory.dmp	CryptoLocker_rule2

Detection of Cryptolocker Samples 5 IoCs

Processes:

resource	yara_rule
behavioral2/memory/1056-0-0x0000000000500000-0x000000000050F311-memory.dmp	CryptoLocker_set1
C:\Users\Admin\AppData\Local\Temp\asih.exe	CryptoLocker_set1
behavioral2/memory/1056-17-0x0000000000500000-0x000000000050F311-memory.dmp	CryptoLocker_set1
behavioral2/memory/3672-18-0x0000000000500000-0x000000000050F311-memory.dmp	CryptoLocker_set1
behavioral2/memory/3672-27-0x0000000000500000-0x000000000050F311-memory.dmp	CryptoLocker_set1

UPX dump on OEP (original entry point) 5 IoCs

Processes:

resource	yara_rule
behavioral2/memory/1056-0-0x0000000000500000-0x000000000050F311-memory.dmp	UPX
C:\Users\Admin\AppData\Local\Temp\asih.exe	UPX
behavioral2/memory/1056-17-0x0000000000500000-0x000000000050F311-memory.dmp	UPX
behavioral2/memory/3672-18-0x0000000000500000-0x000000000050F311-memory.dmp	UPX
behavioral2/memory/3672-27-0x0000000000500000-0x000000000050F311-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_f85f8aed872b9d76f6e2f7d13fdc4efd_cryptolocker.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-1181767204-2009306918-3718769404-1000\Control Panel\International\Geo\Nation	2024-05-24_f85f8aed872b9d76f6e2f7d13fdc4efd_cryptolocker.exe

Executes dropped EXE 1 IoCs

Processes:

asih.exe

pid process

3672 asih.exe

pid	process
3672	asih.exe

UPX packed file 5 IoCs

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

upx

Processes:

resource	yara_rule
behavioral2/memory/1056-0-0x0000000000500000-0x000000000050F311-memory.dmp	upx
C:\Users\Admin\AppData\Local\Temp\asih.exe	upx
behavioral2/memory/1056-17-0x0000000000500000-0x000000000050F311-memory.dmp	upx
behavioral2/memory/3672-18-0x0000000000500000-0x000000000050F311-memory.dmp	upx
behavioral2/memory/3672-27-0x0000000000500000-0x000000000050F311-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_f85f8aed872b9d76f6e2f7d13fdc4efd_cryptolocker.exe

description	pid	process	target process
PID 1056 wrote to memory of 3672	1056	2024-05-24_f85f8aed872b9d76f6e2f7d13fdc4efd_cryptolocker.exe	asih.exe
PID 1056 wrote to memory of 3672	1056	2024-05-24_f85f8aed872b9d76f6e2f7d13fdc4efd_cryptolocker.exe	asih.exe
PID 1056 wrote to memory of 3672	1056	2024-05-24_f85f8aed872b9d76f6e2f7d13fdc4efd_cryptolocker.exe	asih.exe

C:\Users\Admin\AppData\Local\Temp\2024-05-24_f85f8aed872b9d76f6e2f7d13fdc4efd_cryptolocker.exe
"C:\Users\Admin\AppData\Local\Temp\2024-05-24_f85f8aed872b9d76f6e2f7d13fdc4efd_cryptolocker.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:1056

C:\Users\Admin\AppData\Local\Temp\asih.exe
"C:\Users\Admin\AppData\Local\Temp\asih.exe"
2⤵
- Executes dropped EXE
PID:3672

C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
"C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --no-appcompat-clear --field-trial-handle=4080,i,5711962389779687290,1245653010537220991,262144 --variations-seed-version --mojo-platform-channel-handle=3772 /prefetch:8
1⤵
PID:400

Network

MITRE ATT&CK Matrix ATT&CK v13

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Resource Development

Reconnaissance

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Downloads

C:\Users\Admin\AppData\Local\Temp\asih.exe
Filesize
64KB

MD5
fb3b4b4cc6cd232ad6ef57da8fc1d45a

SHA1
730f8349e7bd5e5ccdd91da296cde1af4f163575

SHA256
e54b55843dea0908c117a4d2c8a2f8874c9c1188520cfe09ebaa68f2acf43aee

SHA512
4679a17992eb68416f5a4d8a19407ff7dd0d03ed0287e85da352191e97659b42a73f83b8ce089988e958ab595c77d07d4b1c5e893b15a5ed6e2441bb6abbcd5e

Download Submit
memory/1056-0-0x0000000000500000-0x000000000050F311-memory.dmp

Filesize
60KB

Download
memory/1056-1-0x0000000000660000-0x0000000000666000-memory.dmp

Filesize
24KB

Download
memory/1056-2-0x00000000006D0000-0x00000000006D6000-memory.dmp

Filesize
24KB

Download
memory/1056-9-0x0000000000660000-0x0000000000666000-memory.dmp

Filesize
24KB

Download
memory/1056-17-0x0000000000500000-0x000000000050F311-memory.dmp

Filesize
60KB

Download
memory/3672-18-0x0000000000500000-0x000000000050F311-memory.dmp

Filesize
60KB

Download
memory/3672-20-0x00000000004F0000-0x00000000004F6000-memory.dmp

Filesize
24KB

Download
memory/3672-26-0x00000000004D0000-0x00000000004D6000-memory.dmp

Filesize
24KB

Download
memory/3672-27-0x0000000000500000-0x000000000050F311-memory.dmp

Filesize
60KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v13

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Downloads