b72b3d90646dfe586e31d7a700f4ede4ff89cc77e2ac6afa7f793e8a6279edfa

Analysis

max time kernel
140s
max time network
156s
platform
windows10-2004_x64
resource
win10v2004-20231215-en
resource tags

arch:x64arch:x86image:win10v2004-20231215-enlocale:en-usos:windows10-2004-x64system
submitted
12-02-2024 17:52

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General

Target

2024-02-12_d631986b32595b0722584f5013afa11e_cryptolocker.exe
Size

65KB
MD5

d631986b32595b0722584f5013afa11e
SHA1

fb4ff69e111b0926046ca5eaaa1335ff1305661c
SHA256

b72b3d90646dfe586e31d7a700f4ede4ff89cc77e2ac6afa7f793e8a6279edfa
SHA512

beb77c3d7b5506e7d76590c18c92a61dff78442a7bdf3dbe350ac178631d367ac7783689adf0a3d0d99d624b9426d2ec77ecf69295438d4f6cb001915be96b79
SSDEEP

1536:P8mnK6QFElP6n+gymddpMOtEvwDpjY6UE:1nK6a+qdOOtEvwDpjh

Score

9^/10

upx

Malware Config

Signatures

Detection of CryptoLocker Variants 4 IoCs

Processes:

resource	yara_rule
behavioral2/memory/2680-0-0x0000000000500000-0x000000000050F311-memory.dmp	CryptoLocker_rule2
C:\Users\Admin\AppData\Local\Temp\asih.exe	CryptoLocker_rule2
behavioral2/memory/2680-18-0x0000000000500000-0x000000000050F311-memory.dmp	CryptoLocker_rule2
behavioral2/memory/3948-26-0x0000000000500000-0x000000000050F311-memory.dmp	CryptoLocker_rule2

Detection of Cryptolocker Samples 4 IoCs

Processes:

resource	yara_rule
behavioral2/memory/2680-0-0x0000000000500000-0x000000000050F311-memory.dmp	CryptoLocker_set1
C:\Users\Admin\AppData\Local\Temp\asih.exe	CryptoLocker_set1
behavioral2/memory/2680-18-0x0000000000500000-0x000000000050F311-memory.dmp	CryptoLocker_set1
behavioral2/memory/3948-26-0x0000000000500000-0x000000000050F311-memory.dmp	CryptoLocker_set1

UPX dump on OEP (original entry point) 4 IoCs

Processes:

resource	yara_rule
behavioral2/memory/2680-0-0x0000000000500000-0x000000000050F311-memory.dmp	UPX
C:\Users\Admin\AppData\Local\Temp\asih.exe	UPX
behavioral2/memory/2680-18-0x0000000000500000-0x000000000050F311-memory.dmp	UPX
behavioral2/memory/3948-26-0x0000000000500000-0x000000000050F311-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:

2024-02-12_d631986b32595b0722584f5013afa11e_cryptolocker.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-3073191680-435865314-2862784915-1000\Control Panel\International\Geo\Nation	2024-02-12_d631986b32595b0722584f5013afa11e_cryptolocker.exe

Executes dropped EXE 1 IoCs

Processes:

asih.exe

pid process

3948 asih.exe

pid	process
3948	asih.exe

UPX packed file 4 IoCs

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

upx

Processes:

resource	yara_rule
behavioral2/memory/2680-0-0x0000000000500000-0x000000000050F311-memory.dmp	upx
C:\Users\Admin\AppData\Local\Temp\asih.exe	upx
behavioral2/memory/2680-18-0x0000000000500000-0x000000000050F311-memory.dmp	upx
behavioral2/memory/3948-26-0x0000000000500000-0x000000000050F311-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:

2024-02-12_d631986b32595b0722584f5013afa11e_cryptolocker.exe

description	pid	process	target process
PID 2680 wrote to memory of 3948	2680	2024-02-12_d631986b32595b0722584f5013afa11e_cryptolocker.exe	asih.exe
PID 2680 wrote to memory of 3948	2680	2024-02-12_d631986b32595b0722584f5013afa11e_cryptolocker.exe	asih.exe
PID 2680 wrote to memory of 3948	2680	2024-02-12_d631986b32595b0722584f5013afa11e_cryptolocker.exe	asih.exe

C:\Users\Admin\AppData\Local\Temp\2024-02-12_d631986b32595b0722584f5013afa11e_cryptolocker.exe
"C:\Users\Admin\AppData\Local\Temp\2024-02-12_d631986b32595b0722584f5013afa11e_cryptolocker.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:2680

C:\Users\Admin\AppData\Local\Temp\asih.exe
"C:\Users\Admin\AppData\Local\Temp\asih.exe"
2⤵
- Executes dropped EXE
PID:3948

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
65KB

MD5
39cc4e753c4828f5cb3e57c21f9dd3ea

SHA1
f53adffee237a909a9d4706f799bd6ef5ba0ffbc

SHA256
b9bddc5a44d8e5a241497acbe2b444e3336ac34fdaf44f10cb218f7ca1f2e9dc

SHA512
3d1b6d91d93a526129042c8059cfef17dc78a71dfd94493eb3132adce262348007e59a677d5e30dd9b96275c66e5c7c5b828dd2900d4279b5d6c1cb9911a8921

Download Submit
memory/2680-0-0x0000000000500000-0x000000000050F311-memory.dmp

Filesize
60KB

Download
memory/2680-1-0x00000000004D0000-0x00000000004D6000-memory.dmp

Filesize
24KB

Download
memory/2680-2-0x00000000004D0000-0x00000000004D6000-memory.dmp

Filesize
24KB

Download
memory/2680-3-0x00000000004F0000-0x00000000004F6000-memory.dmp

Filesize
24KB

Download
memory/2680-18-0x0000000000500000-0x000000000050F311-memory.dmp

Filesize
60KB

Download
memory/3948-19-0x00000000006C0000-0x00000000006C6000-memory.dmp

Filesize
24KB

Download
memory/3948-21-0x00000000006A0000-0x00000000006A6000-memory.dmp

Filesize
24KB

Download
memory/3948-26-0x0000000000500000-0x000000000050F311-memory.dmp

Filesize
60KB

Download