efa9a28bda455561043ccddca4fe61d76b4f2dc14d2e2cae7ef96957b8df7d57

Analysis

max time kernel
148s
max time network
150s
platform
windows10-2004_x64
resource
win10v2004-20231222-en
resource tags

arch:x64arch:x86image:win10v2004-20231222-enlocale:en-usos:windows10-2004-x64system
submitted
13/02/2024, 14:54

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General

Target

2024-02-13_dfc68a4422144377f4a7e8dab62aef32_cryptolocker.exe
Size

80KB
MD5

dfc68a4422144377f4a7e8dab62aef32
SHA1

e52f5fcd63471fd930d5999cc62505fb17dd8b69
SHA256

efa9a28bda455561043ccddca4fe61d76b4f2dc14d2e2cae7ef96957b8df7d57
SHA512

f467998cae25617f6f440182d29dc7fd29e47f29f686ff3772ea5b84ae37dbbd0968bd723c4af9ae86655d823a761b92f4e17873a15fc5143140f0df1917b734
SSDEEP

1536:T6QFElP6n+gxmddpMOtEvwDpjwaxTNUOAkXtBd0nJ:T6a+rdOOtEvwDpjNtK

Score

9^/10

upx

Malware Config

Signatures

Detection of CryptoLocker Variants 4 IoCs

resource	yara_rule
behavioral2/memory/4592-0-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2
behavioral2/files/0x0007000000023226-13.dat	CryptoLocker_rule2
behavioral2/memory/4592-17-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2
behavioral2/memory/2920-26-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_rule2

Detection of Cryptolocker Samples 4 IoCs

resource	yara_rule
behavioral2/memory/4592-0-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1
behavioral2/files/0x0007000000023226-13.dat	CryptoLocker_set1
behavioral2/memory/4592-17-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1
behavioral2/memory/2920-26-0x0000000000500000-0x0000000000510000-memory.dmp	CryptoLocker_set1

UPX dump on OEP (original entry point) 4 IoCs

resource	yara_rule
behavioral2/memory/4592-0-0x0000000000500000-0x0000000000510000-memory.dmp	UPX
behavioral2/files/0x0007000000023226-13.dat	UPX
behavioral2/memory/4592-17-0x0000000000500000-0x0000000000510000-memory.dmp	UPX
behavioral2/memory/2920-26-0x0000000000500000-0x0000000000510000-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-1-5-21-1168293393-3419776239-306423207-1000\Control Panel\International\Geo\Nation	2024-02-13_dfc68a4422144377f4a7e8dab62aef32_cryptolocker.exe

Executes dropped EXE 1 IoCs

pid	Process
2920	asih.exe

UPX packed file 4 IoCs

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

upx

resource	yara_rule
behavioral2/memory/4592-0-0x0000000000500000-0x0000000000510000-memory.dmp	upx
behavioral2/files/0x0007000000023226-13.dat	upx
behavioral2/memory/4592-17-0x0000000000500000-0x0000000000510000-memory.dmp	upx
behavioral2/memory/2920-26-0x0000000000500000-0x0000000000510000-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 4592 wrote to memory of 2920	4592	2024-02-13_dfc68a4422144377f4a7e8dab62aef32_cryptolocker.exe	84
PID 4592 wrote to memory of 2920	4592	2024-02-13_dfc68a4422144377f4a7e8dab62aef32_cryptolocker.exe	84
PID 4592 wrote to memory of 2920	4592	2024-02-13_dfc68a4422144377f4a7e8dab62aef32_cryptolocker.exe	84

C:\Users\Admin\AppData\Local\Temp\2024-02-13_dfc68a4422144377f4a7e8dab62aef32_cryptolocker.exe
"C:\Users\Admin\AppData\Local\Temp\2024-02-13_dfc68a4422144377f4a7e8dab62aef32_cryptolocker.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:4592
- C:\Users\Admin\AppData\Local\Temp\asih.exe
  "C:\Users\Admin\AppData\Local\Temp\asih.exe"
  2⤵
  - Executes dropped EXE
  PID:2920

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
80KB

MD5
41a177f8c44a7f18855c9e12482d5a0e

SHA1
be4ac75d4ed311ae55d03acdf79bb6cbbfc417b8

SHA256
5ad4b079bbc3c87380971bb6281b8c302ab527332e197db7c4ebb6cbbb893090

SHA512
94bfe8cb4ad073886878fc59d717229750da367b599564dd71ae85a731728ad69936e5c422247a509b06cadce5c967c750bb5415da5b973fc3c82bc1c9234dc8

Download Submit
memory/2920-19-0x00000000004F0000-0x00000000004F6000-memory.dmp

Filesize
24KB

Download
memory/2920-25-0x00000000004D0000-0x00000000004D6000-memory.dmp

Filesize
24KB

Download
memory/2920-26-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download
memory/4592-0-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download
memory/4592-1-0x0000000000520000-0x0000000000526000-memory.dmp

Filesize
24KB

Download
memory/4592-2-0x0000000000520000-0x0000000000526000-memory.dmp

Filesize
24KB

Download
memory/4592-3-0x0000000000540000-0x0000000000546000-memory.dmp

Filesize
24KB

Download
memory/4592-17-0x0000000000500000-0x0000000000510000-memory.dmp

Filesize
64KB

Download