f919f08f5330afdddb7a5535e209272def02de0213c2a6561ba5ec1f78db0119

General

Target

2024-05-07_287cfc9e15297f448d050733bd44ed2b_cryptolocker.exe
Size

38KB
MD5

287cfc9e15297f448d050733bd44ed2b
SHA1

dd0e78eab469e38f900a9cf98a10e429d2572a3a
SHA256

f919f08f5330afdddb7a5535e209272def02de0213c2a6561ba5ec1f78db0119
SHA512

f1e6390d187a82941be95c10bbb0cc0bc57c72987f59f382a63b600d1f03fc56a0d5ed7c0e90b51b8767d23ac17ff5042ce11de7677a79680b833fc79f8de64a
SSDEEP

768:q7PdFecFS5agQtOOtEvwDpjeMLZdzuqpXsiE8Wq/DpkITY93J:qDdFJy3QMOtEvwDpjjWMl7TAJ

Score

9^/10

upx

Malware Config

Signatures

Detection of CryptoLocker Variants 5 IoCs

resource	yara_rule
behavioral2/memory/4752-0-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2
behavioral2/files/0x000800000002323e-13.dat	CryptoLocker_rule2
behavioral2/memory/4752-17-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2
behavioral2/memory/4896-19-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2
behavioral2/memory/4896-28-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2

Detection of Cryptolocker Samples 5 IoCs

resource	yara_rule
behavioral2/memory/4752-0-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1
behavioral2/files/0x000800000002323e-13.dat	CryptoLocker_set1
behavioral2/memory/4752-17-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1
behavioral2/memory/4896-19-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1
behavioral2/memory/4896-28-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1

UPX dump on OEP (original entry point) 5 IoCs

resource	yara_rule
behavioral2/memory/4752-0-0x0000000000500000-0x0000000000510000-memory.dmp	UPX
behavioral2/files/0x000800000002323e-13.dat	UPX
behavioral2/memory/4752-17-0x0000000000500000-0x0000000000510000-memory.dmp	UPX
behavioral2/memory/4896-19-0x0000000000500000-0x0000000000510000-memory.dmp	UPX
behavioral2/memory/4896-28-0x0000000000500000-0x0000000000510000-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	2024-05-07_287cfc9e15297f448d050733bd44ed2b_cryptolocker.exe

Executes dropped EXE 1 IoCs

pid	Process
4896	asih.exe

UPX packed file 5 IoCs

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

upx

resource	yara_rule
behavioral2/memory/4752-0-0x0000000000500000-0x0000000000510000-memory.dmp	upx
behavioral2/files/0x000800000002323e-13.dat	upx
behavioral2/memory/4752-17-0x0000000000500000-0x0000000000510000-memory.dmp	upx
behavioral2/memory/4896-19-0x0000000000500000-0x0000000000510000-memory.dmp	upx
behavioral2/memory/4896-28-0x0000000000500000-0x0000000000510000-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 4752 wrote to memory of 4896	4752	2024-05-07_287cfc9e15297f448d050733bd44ed2b_cryptolocker.exe	90
PID 4752 wrote to memory of 4896	4752	2024-05-07_287cfc9e15297f448d050733bd44ed2b_cryptolocker.exe	90
PID 4752 wrote to memory of 4896	4752	2024-05-07_287cfc9e15297f448d050733bd44ed2b_cryptolocker.exe	90

C:\Users\Admin\AppData\Local\Temp\2024-05-07_287cfc9e15297f448d050733bd44ed2b_cryptolocker.exe
"C:\Users\Admin\AppData\Local\Temp\2024-05-07_287cfc9e15297f448d050733bd44ed2b_cryptolocker.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:4752
- C:\Users\Admin\AppData\Local\Temp\asih.exe
  "C:\Users\Admin\AppData\Local\Temp\asih.exe"
  2⤵
  - Executes dropped EXE
  PID:4896

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=4092 --field-trial-handle=2280,i,716736634476467098,11449718822158202904,262144 --variations-seed-version /prefetch:8
1⤵
PID:4148

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
38KB

MD5
8a571d3e6fb47700413eb7b058791a01

SHA1
7018393514ea7266e8b9283bf55fb82f751548ba

SHA256
2f7292942834d31acbb0078efdedd6b219bd7eb7f8f83c3da86b64046d063715

SHA512
e34e02fbf3d853de285ab20701af4eea36caf02719a22f4d0d39a0e5ddd11cb509237937ea67432d41c58e1edbc2d6fd5ac800fdf8bb747570a35d39c39c2bb4

Download Submit
memory/4752-0-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download
memory/4752-1-0x00000000006A0000-0x00000000006A6000-memory.dmp

Filesize
24KB

Download
memory/4752-2-0x00000000006A0000-0x00000000006A6000-memory.dmp

Filesize
24KB

Download
memory/4752-3-0x00000000006C0000-0x00000000006C6000-memory.dmp

Filesize
24KB

Download
memory/4752-17-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download
memory/4896-19-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download
memory/4896-21-0x0000000002080000-0x0000000002086000-memory.dmp

Filesize
24KB

Download
memory/4896-27-0x00000000006B0000-0x00000000006B6000-memory.dmp

Filesize
24KB

Download
memory/4896-28-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download

Analysis

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