2aef79b3033099fbc793dc2ce5ed4ed7f5217921a4fc0293fa110026189bd0a6

General

Target

2024-03-15_55b25de71a72c3e2a88b7feac3522556_cryptolocker.exe
Size

87KB
MD5

55b25de71a72c3e2a88b7feac3522556
SHA1

3310081ebcd467eb9d08980e0d49bce36a2b9b11
SHA256

2aef79b3033099fbc793dc2ce5ed4ed7f5217921a4fc0293fa110026189bd0a6
SHA512

9a17f0c991b48fe3d2f772580882d3aee18eb791eb7ab5d21122a7c0270bfa785639dec6f365e253484ad241515ac91b4f309954d373aea4cad5c05a1909f5ab
SSDEEP

768:qkmnjFom/kLyMro2GtOOtEvwDpjeY10Y/YMsvlMdwPK80GQuchoIgtISEu:qkmnpomddpMOtEvwDpjJGYQbN/PKwMgf

Score

9^/10

upx

Malware Config

Signatures

Detection of CryptoLocker Variants 5 IoCs

resource	yara_rule
behavioral2/memory/4632-0-0x0000000000500000-0x000000000050F000-memory.dmp	CryptoLocker_rule2
behavioral2/memory/4632-1-0x0000000000500000-0x000000000050F000-memory.dmp	CryptoLocker_rule2
behavioral2/files/0x0004000000022d20-14.dat	CryptoLocker_rule2
behavioral2/memory/4632-20-0x0000000000500000-0x000000000050F000-memory.dmp	CryptoLocker_rule2
behavioral2/memory/4308-28-0x0000000000500000-0x000000000050F000-memory.dmp	CryptoLocker_rule2

Detection of Cryptolocker Samples 5 IoCs

resource	yara_rule
behavioral2/memory/4632-0-0x0000000000500000-0x000000000050F000-memory.dmp	CryptoLocker_set1
behavioral2/memory/4632-1-0x0000000000500000-0x000000000050F000-memory.dmp	CryptoLocker_set1
behavioral2/files/0x0004000000022d20-14.dat	CryptoLocker_set1
behavioral2/memory/4632-20-0x0000000000500000-0x000000000050F000-memory.dmp	CryptoLocker_set1
behavioral2/memory/4308-28-0x0000000000500000-0x000000000050F000-memory.dmp	CryptoLocker_set1

UPX dump on OEP (original entry point) 5 IoCs

resource	yara_rule
behavioral2/memory/4632-0-0x0000000000500000-0x000000000050F000-memory.dmp	UPX
behavioral2/memory/4632-1-0x0000000000500000-0x000000000050F000-memory.dmp	UPX
behavioral2/files/0x0004000000022d20-14.dat	UPX
behavioral2/memory/4632-20-0x0000000000500000-0x000000000050F000-memory.dmp	UPX
behavioral2/memory/4308-28-0x0000000000500000-0x000000000050F000-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

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-3808065738-1666277613-1125846146-1000\Control Panel\International\Geo\Nation	2024-03-15_55b25de71a72c3e2a88b7feac3522556_cryptolocker.exe

Executes dropped EXE 1 IoCs

pid	Process
4308	asih.exe

UPX packed file 5 IoCs

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

upx

resource	yara_rule
behavioral2/memory/4632-0-0x0000000000500000-0x000000000050F000-memory.dmp	upx
behavioral2/memory/4632-1-0x0000000000500000-0x000000000050F000-memory.dmp	upx
behavioral2/files/0x0004000000022d20-14.dat	upx
behavioral2/memory/4632-20-0x0000000000500000-0x000000000050F000-memory.dmp	upx
behavioral2/memory/4308-28-0x0000000000500000-0x000000000050F000-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

description	pid	Process	procid_target
PID 4632 wrote to memory of 4308	4632	2024-03-15_55b25de71a72c3e2a88b7feac3522556_cryptolocker.exe	101
PID 4632 wrote to memory of 4308	4632	2024-03-15_55b25de71a72c3e2a88b7feac3522556_cryptolocker.exe	101
PID 4632 wrote to memory of 4308	4632	2024-03-15_55b25de71a72c3e2a88b7feac3522556_cryptolocker.exe	101

C:\Users\Admin\AppData\Local\Temp\2024-03-15_55b25de71a72c3e2a88b7feac3522556_cryptolocker.exe
"C:\Users\Admin\AppData\Local\Temp\2024-03-15_55b25de71a72c3e2a88b7feac3522556_cryptolocker.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:4632
- C:\Users\Admin\AppData\Local\Temp\asih.exe
  "C:\Users\Admin\AppData\Local\Temp\asih.exe"
  2⤵
  - Executes dropped EXE
  PID:4308

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 --mojo-platform-channel-handle=1408 --field-trial-handle=2276,i,5697607538120380977,9987005253899555344,262144 --variations-seed-version /prefetch:8
1⤵
PID:3460

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\asih.exe

Filesize
87KB

MD5
2e208973ffb791f159e01d61df4d0d6b

SHA1
f894ae2c8d65ed07f556460855fe6d1e973e317f

SHA256
7cbbfe6de08fade44ee31c3d5a31bbbe14014caf4d0ae312437894e891017673

SHA512
fe2ac495a7ab86db48c5c9fafbd9608f4dafbe61e8e07f5edaed7074d1eaf19650e2f8e9bf204e4e8e54302baee33a4424ef933f2fb8e42a20feaf15f29c7112

Download Submit
memory/4308-22-0x00000000005A0000-0x00000000005A6000-memory.dmp

Filesize
24KB

Download
memory/4308-19-0x00000000005D0000-0x00000000005D6000-memory.dmp

Filesize
24KB

Download
memory/4308-28-0x0000000000500000-0x000000000050F000-memory.dmp

Filesize
60KB

Download
memory/4632-0-0x0000000000500000-0x000000000050F000-memory.dmp

Filesize
60KB

Download
memory/4632-1-0x0000000000500000-0x000000000050F000-memory.dmp

Filesize
60KB

Download
memory/4632-2-0x00000000006A0000-0x00000000006A6000-memory.dmp

Filesize
24KB

Download
memory/4632-3-0x00000000006A0000-0x00000000006A6000-memory.dmp

Filesize
24KB

Download
memory/4632-4-0x00000000006C0000-0x00000000006C6000-memory.dmp

Filesize
24KB

Download
memory/4632-20-0x0000000000500000-0x000000000050F000-memory.dmp

Filesize
60KB

Download

Analysis

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