a9e824f72a051b236ad99671b25ae15193507c4b981cfdc52731b5268268b0e0

General

Target

2024-06-11_4745b06fcf7d6b8cd1d6f3b5fce0429f_cryptolocker.exe
Size

96KB
MD5

4745b06fcf7d6b8cd1d6f3b5fce0429f
SHA1

9b33aa8ce3007c6b5c6c69e680d895666d322bff
SHA256

a9e824f72a051b236ad99671b25ae15193507c4b981cfdc52731b5268268b0e0
SHA512

ae4a9fad58441c7865b6425bd2b04d64ede9ff37945f94d88ec96374127a96fed1c6f2a373102465bf0dae95cf46746d4c93638716384bd88607a3746d39fc9c
SSDEEP

1536:qkmnpomddpMOtEvwDpjJGYQbN/PKwNgp0+Yn:AnBdOOtEvwDpj6zh

Score

9^/10

upx

Malware Config

Signatures

Detection of CryptoLocker Variants 5 IoCs

resource	yara_rule
behavioral2/memory/3144-0-0x0000000000500000-0x000000000050F000-memory.dmp	CryptoLocker_rule2
behavioral2/files/0x00090000000235bb-13.dat	CryptoLocker_rule2
behavioral2/memory/3144-18-0x0000000000500000-0x000000000050F000-memory.dmp	CryptoLocker_rule2
behavioral2/memory/1048-19-0x0000000000500000-0x000000000050F000-memory.dmp	CryptoLocker_rule2
behavioral2/memory/1048-28-0x0000000000500000-0x000000000050F000-memory.dmp	CryptoLocker_rule2

Detection of Cryptolocker Samples 5 IoCs

resource	yara_rule
behavioral2/memory/3144-0-0x0000000000500000-0x000000000050F000-memory.dmp	CryptoLocker_set1
behavioral2/files/0x00090000000235bb-13.dat	CryptoLocker_set1
behavioral2/memory/3144-18-0x0000000000500000-0x000000000050F000-memory.dmp	CryptoLocker_set1
behavioral2/memory/1048-19-0x0000000000500000-0x000000000050F000-memory.dmp	CryptoLocker_set1
behavioral2/memory/1048-28-0x0000000000500000-0x000000000050F000-memory.dmp	CryptoLocker_set1

UPX dump on OEP (original entry point) 5 IoCs

resource	yara_rule
behavioral2/memory/3144-0-0x0000000000500000-0x000000000050F000-memory.dmp	UPX
behavioral2/files/0x00090000000235bb-13.dat	UPX
behavioral2/memory/3144-18-0x0000000000500000-0x000000000050F000-memory.dmp	UPX
behavioral2/memory/1048-19-0x0000000000500000-0x000000000050F000-memory.dmp	UPX
behavioral2/memory/1048-28-0x0000000000500000-0x000000000050F000-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-1-5-21-1181767204-2009306918-3718769404-1000\Control Panel\International\Geo\Nation	2024-06-11_4745b06fcf7d6b8cd1d6f3b5fce0429f_cryptolocker.exe

Executes dropped EXE 1 IoCs

pid	Process
1048	asih.exe

UPX packed file 5 IoCs

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

upx

resource	yara_rule
behavioral2/memory/3144-0-0x0000000000500000-0x000000000050F000-memory.dmp	upx
behavioral2/files/0x00090000000235bb-13.dat	upx
behavioral2/memory/3144-18-0x0000000000500000-0x000000000050F000-memory.dmp	upx
behavioral2/memory/1048-19-0x0000000000500000-0x000000000050F000-memory.dmp	upx
behavioral2/memory/1048-28-0x0000000000500000-0x000000000050F000-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 3144 wrote to memory of 1048	3144	2024-06-11_4745b06fcf7d6b8cd1d6f3b5fce0429f_cryptolocker.exe	89
PID 3144 wrote to memory of 1048	3144	2024-06-11_4745b06fcf7d6b8cd1d6f3b5fce0429f_cryptolocker.exe	89
PID 3144 wrote to memory of 1048	3144	2024-06-11_4745b06fcf7d6b8cd1d6f3b5fce0429f_cryptolocker.exe	89

C:\Users\Admin\AppData\Local\Temp\2024-06-11_4745b06fcf7d6b8cd1d6f3b5fce0429f_cryptolocker.exe
"C:\Users\Admin\AppData\Local\Temp\2024-06-11_4745b06fcf7d6b8cd1d6f3b5fce0429f_cryptolocker.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:3144
- C:\Users\Admin\AppData\Local\Temp\asih.exe
  "C:\Users\Admin\AppData\Local\Temp\asih.exe"
  2⤵
  - Executes dropped EXE
  PID:1048

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=4048,i,15140928051103392835,1612840580898364401,262144 --variations-seed-version --mojo-platform-channel-handle=4836 /prefetch:8
1⤵
PID:1900

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
96KB

MD5
8500b40765c711c3e811cacc7a7ab425

SHA1
60d86c97c8a455d86f0b60399639be94303fe5c3

SHA256
6c727969c0547c8b32d9008cd7c3920a13b52b8fb8aa2faab67b717f401d819e

SHA512
5ef8f53d9d4d75cdcae6728c6b5ef52ceff103a12ed60646a4f7c3e1118035859a55655a85a095ac5146dddf9ca8f86725f438141f6ea978d3c17a36b7440592

Download Submit
memory/1048-19-0x0000000000500000-0x000000000050F000-memory.dmp

Filesize
60KB

Download
memory/1048-21-0x0000000002070000-0x0000000002076000-memory.dmp

Filesize
24KB

Download
memory/1048-27-0x0000000002050000-0x0000000002056000-memory.dmp

Filesize
24KB

Download
memory/1048-28-0x0000000000500000-0x000000000050F000-memory.dmp

Filesize
60KB

Download
memory/3144-0-0x0000000000500000-0x000000000050F000-memory.dmp

Filesize
60KB

Download
memory/3144-1-0x0000000000630000-0x0000000000636000-memory.dmp

Filesize
24KB

Download
memory/3144-2-0x00000000020F0000-0x00000000020F6000-memory.dmp

Filesize
24KB

Download
memory/3144-9-0x0000000000630000-0x0000000000636000-memory.dmp

Filesize
24KB

Download
memory/3144-18-0x0000000000500000-0x000000000050F000-memory.dmp

Filesize
60KB

Download

Analysis

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