b6eff88fe5c80a21524ddf67a0f68529fb648196eada34849898094e2bda086f

Analysis

max time kernel
149s
max time network
153s
platform
windows10-2004_x64
resource
win10v2004-20240221-en
resource tags

arch:x64arch:x86image:win10v2004-20240221-enlocale:en-usos:windows10-2004-x64system
submitted
23/02/2024, 15:01

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General

Target

2024-02-23_531b1f068781d8d656db25dae5a04895_cryptolocker.exe
Size

88KB
MD5

531b1f068781d8d656db25dae5a04895
SHA1

15b4a519f48dc903dbe6eb197e3a4b21872c915f
SHA256

b6eff88fe5c80a21524ddf67a0f68529fb648196eada34849898094e2bda086f
SHA512

fcaee05173c711b3e2a16a625b11158a47bc7f37b4104e77dc134adbd66adf1a1aabda578c53940a10092ef758f0c6dd217433bbc515577f888b220265724db5
SSDEEP

1536:qkmnpomddpMOtEvwDpjJGYQbN/PKwMgL9:AnBdOOtEvwDpj6zF

Score

9^/10

upx

Malware Config

Signatures

Detection of CryptoLocker Variants 4 IoCs

resource	yara_rule
behavioral2/memory/2356-0-0x0000000000500000-0x000000000050F000-memory.dmp	CryptoLocker_rule2
behavioral2/files/0x0008000000023260-13.dat	CryptoLocker_rule2
behavioral2/memory/2356-17-0x0000000000500000-0x000000000050F000-memory.dmp	CryptoLocker_rule2
behavioral2/memory/3752-26-0x0000000000500000-0x000000000050F000-memory.dmp	CryptoLocker_rule2

Detection of Cryptolocker Samples 4 IoCs

resource	yara_rule
behavioral2/memory/2356-0-0x0000000000500000-0x000000000050F000-memory.dmp	CryptoLocker_set1
behavioral2/files/0x0008000000023260-13.dat	CryptoLocker_set1
behavioral2/memory/2356-17-0x0000000000500000-0x000000000050F000-memory.dmp	CryptoLocker_set1
behavioral2/memory/3752-26-0x0000000000500000-0x000000000050F000-memory.dmp	CryptoLocker_set1

UPX dump on OEP (original entry point) 4 IoCs

resource	yara_rule
behavioral2/memory/2356-0-0x0000000000500000-0x000000000050F000-memory.dmp	UPX
behavioral2/files/0x0008000000023260-13.dat	UPX
behavioral2/memory/2356-17-0x0000000000500000-0x000000000050F000-memory.dmp	UPX
behavioral2/memory/3752-26-0x0000000000500000-0x000000000050F000-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-1-5-21-910440534-423636034-2318342392-1000\Control Panel\International\Geo\Nation	2024-02-23_531b1f068781d8d656db25dae5a04895_cryptolocker.exe

Executes dropped EXE 1 IoCs

pid	Process
3752	asih.exe

UPX packed file 4 IoCs

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

upx

resource	yara_rule
behavioral2/memory/2356-0-0x0000000000500000-0x000000000050F000-memory.dmp	upx
behavioral2/files/0x0008000000023260-13.dat	upx
behavioral2/memory/2356-17-0x0000000000500000-0x000000000050F000-memory.dmp	upx
behavioral2/memory/3752-26-0x0000000000500000-0x000000000050F000-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 2356 wrote to memory of 3752	2356	2024-02-23_531b1f068781d8d656db25dae5a04895_cryptolocker.exe	85
PID 2356 wrote to memory of 3752	2356	2024-02-23_531b1f068781d8d656db25dae5a04895_cryptolocker.exe	85
PID 2356 wrote to memory of 3752	2356	2024-02-23_531b1f068781d8d656db25dae5a04895_cryptolocker.exe	85

C:\Users\Admin\AppData\Local\Temp\2024-02-23_531b1f068781d8d656db25dae5a04895_cryptolocker.exe
"C:\Users\Admin\AppData\Local\Temp\2024-02-23_531b1f068781d8d656db25dae5a04895_cryptolocker.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:2356
- C:\Users\Admin\AppData\Local\Temp\asih.exe
  "C:\Users\Admin\AppData\Local\Temp\asih.exe"
  2⤵
  - Executes dropped EXE
  PID:3752

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

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
88KB

MD5
0ebaec12b219817bde124eaae0c2c260

SHA1
2a97f87ebecf6eee65b41f73f246a4e4278eb2f5

SHA256
77cf44c51ad2f489f2a12affbd37241d316b376ad4f12d56a09a795c262d53ad

SHA512
66075db413dd74e4030e399f53819a5f9d6b3fd7f5e95c0afc1df43b1be9b5cad185d6004e5e8e3a1627fc93751328eb8900bd58fe5506e7dba9120bc20de3f1

Download Submit
memory/2356-0-0x0000000000500000-0x000000000050F000-memory.dmp

Filesize
60KB

Download
memory/2356-1-0x0000000002210000-0x0000000002216000-memory.dmp

Filesize
24KB

Download
memory/2356-2-0x0000000002210000-0x0000000002216000-memory.dmp

Filesize
24KB

Download
memory/2356-3-0x0000000002230000-0x0000000002236000-memory.dmp

Filesize
24KB

Download
memory/2356-17-0x0000000000500000-0x000000000050F000-memory.dmp

Filesize
60KB

Download
memory/3752-19-0x0000000002080000-0x0000000002086000-memory.dmp

Filesize
24KB

Download
memory/3752-21-0x00000000004E0000-0x00000000004E6000-memory.dmp

Filesize
24KB

Download
memory/3752-26-0x0000000000500000-0x000000000050F000-memory.dmp

Filesize
60KB

Download