Malware Analysis Report

2025-08-10 20:53

Sample ID 240825-hp9bxsselq
Target 2024-08-25_a76390fafba98b5d45bd1d8b9590515f_cryptolocker
SHA256 c41d4004f10d1594470160dd951d8d974fe1a5fa29025be7995b02eecd94106d
Tags
upx discovery
score
7/10

Table of Contents

Analysis Overview

MITRE ATT&CK

Enterprise Matrix V15

Analysis: static1

Detonation Overview

Signatures

Analysis: behavioral1

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis: behavioral2

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis Overview

score
7/10

SHA256

c41d4004f10d1594470160dd951d8d974fe1a5fa29025be7995b02eecd94106d

Threat Level: Shows suspicious behavior

The file 2024-08-25_a76390fafba98b5d45bd1d8b9590515f_cryptolocker was found to be: Shows suspicious behavior.

Malicious Activity Summary

upx discovery

UPX packed file

Executes dropped EXE

Loads dropped DLL

Checks computer location settings

Unsigned PE

Enumerates physical storage devices

System Location Discovery: System Language Discovery

Suspicious use of UnmapMainImage

Suspicious use of WriteProcessMemory

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-08-25 06:55

Signatures

UPX packed file

upx
Description Indicator Process Target
N/A N/A N/A N/A

Unsigned PE

Description Indicator Process Target
N/A N/A N/A N/A

Analysis: behavioral1

Detonation Overview

Submitted

2024-08-25 06:55

Reported

2024-08-25 06:58

Platform

win7-20240729-en

Max time kernel

148s

Max time network

149s

Command Line

"C:\Users\Admin\AppData\Local\Temp\2024-08-25_a76390fafba98b5d45bd1d8b9590515f_cryptolocker.exe"

Signatures

Executes dropped EXE

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\rewok.exe N/A

Loads dropped DLL

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\2024-08-25_a76390fafba98b5d45bd1d8b9590515f_cryptolocker.exe N/A

UPX packed file

upx
Description Indicator Process Target
N/A N/A N/A N/A
N/A N/A N/A N/A

Enumerates physical storage devices

System Location Discovery: System Language Discovery

discovery
Description Indicator Process Target
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Users\Admin\AppData\Local\Temp\2024-08-25_a76390fafba98b5d45bd1d8b9590515f_cryptolocker.exe N/A
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Users\Admin\AppData\Local\Temp\rewok.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\2024-08-25_a76390fafba98b5d45bd1d8b9590515f_cryptolocker.exe

"C:\Users\Admin\AppData\Local\Temp\2024-08-25_a76390fafba98b5d45bd1d8b9590515f_cryptolocker.exe"

C:\Users\Admin\AppData\Local\Temp\rewok.exe

"C:\Users\Admin\AppData\Local\Temp\rewok.exe"

Network

Country Destination Domain Proto
US 8.8.8.8:53 spinistry.com udp
US 64.98.135.121:443 spinistry.com tcp
US 64.98.135.121:443 spinistry.com tcp
US 64.98.135.121:443 spinistry.com tcp
US 64.98.135.121:443 spinistry.com tcp
US 64.98.135.121:443 spinistry.com tcp
US 64.98.135.121:443 spinistry.com tcp
US 64.98.135.121:443 spinistry.com tcp
US 64.98.135.121:443 spinistry.com tcp

Files

memory/2688-2-0x0000000000400000-0x0000000000406000-memory.dmp

memory/2688-1-0x0000000000280000-0x0000000000286000-memory.dmp

C:\Users\Admin\AppData\Local\Temp\rewok.exe

MD5 11964a9b6cfba36811d1d684bef72eaa
SHA1 5458addf44be51a158b3f3b3e16c29506ebde09f
SHA256 674d349b2b7bdd4be1d969e618107fceb3808e0064c96df90ee3ff8b54bb4d8a
SHA512 cc874f80dadd3a1ee2d109173e5d7423c1b4a9f8b16667603b79c1c9de335dab48b9952476d81ece5389e85fd7a76d70ecd8b99617cfcab312fd157105d95453

memory/2248-17-0x0000000000370000-0x0000000000376000-memory.dmp

memory/2688-9-0x0000000000280000-0x0000000000286000-memory.dmp

memory/2688-0-0x0000000000400000-0x000000000040E000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-08-25 06:55

Reported

2024-08-25 06:58

Platform

win10v2004-20240802-en

Max time kernel

149s

Max time network

151s

Command Line

"C:\Users\Admin\AppData\Local\Temp\2024-08-25_a76390fafba98b5d45bd1d8b9590515f_cryptolocker.exe"

Signatures

Checks computer location settings

Description Indicator Process Target
Key value queried \REGISTRY\USER\S-1-5-21-355097885-2402257403-2971294179-1000\Control Panel\International\Geo\Nation C:\Users\Admin\AppData\Local\Temp\2024-08-25_a76390fafba98b5d45bd1d8b9590515f_cryptolocker.exe N/A

Executes dropped EXE

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\rewok.exe N/A

UPX packed file

upx
Description Indicator Process Target
N/A N/A N/A N/A
N/A N/A N/A N/A

Enumerates physical storage devices

System Location Discovery: System Language Discovery

discovery
Description Indicator Process Target
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Users\Admin\AppData\Local\Temp\2024-08-25_a76390fafba98b5d45bd1d8b9590515f_cryptolocker.exe N/A
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Users\Admin\AppData\Local\Temp\rewok.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\2024-08-25_a76390fafba98b5d45bd1d8b9590515f_cryptolocker.exe

"C:\Users\Admin\AppData\Local\Temp\2024-08-25_a76390fafba98b5d45bd1d8b9590515f_cryptolocker.exe"

C:\Users\Admin\AppData\Local\Temp\rewok.exe

"C:\Users\Admin\AppData\Local\Temp\rewok.exe"

Network

Country Destination Domain Proto
US 8.8.8.8:53 spinistry.com udp
US 64.98.135.121:443 spinistry.com tcp
US 8.8.8.8:53 217.106.137.52.in-addr.arpa udp
US 8.8.8.8:53 73.144.22.2.in-addr.arpa udp
US 8.8.8.8:53 68.32.126.40.in-addr.arpa udp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
US 8.8.8.8:53 232.168.11.51.in-addr.arpa udp
US 8.8.8.8:53 133.211.185.52.in-addr.arpa udp
US 64.98.135.121:443 spinistry.com tcp
US 8.8.8.8:53 86.23.85.13.in-addr.arpa udp
US 8.8.8.8:53 18.31.95.13.in-addr.arpa udp
US 8.8.8.8:53 147.142.123.92.in-addr.arpa udp
US 64.98.135.121:443 spinistry.com tcp
US 8.8.8.8:53 172.210.232.199.in-addr.arpa udp
US 64.98.135.121:443 spinistry.com tcp
US 8.8.8.8:53 43.58.199.20.in-addr.arpa udp
US 64.98.135.121:443 spinistry.com tcp
US 8.8.8.8:53 21.236.111.52.in-addr.arpa udp
US 8.8.8.8:53 26.35.223.20.in-addr.arpa udp
US 8.8.8.8:53 tse1.mm.bing.net udp
US 150.171.28.10:443 tse1.mm.bing.net tcp
US 150.171.28.10:443 tse1.mm.bing.net tcp
US 150.171.28.10:443 tse1.mm.bing.net tcp
US 150.171.28.10:443 tse1.mm.bing.net tcp
US 150.171.28.10:443 tse1.mm.bing.net tcp
US 64.98.135.121:443 spinistry.com tcp
US 64.98.135.121:443 spinistry.com tcp
US 64.98.135.121:443 spinistry.com tcp
US 8.8.8.8:53 210.143.182.52.in-addr.arpa udp

Files

memory/852-0-0x0000000000400000-0x000000000040E000-memory.dmp

memory/852-1-0x0000000002240000-0x0000000002246000-memory.dmp

memory/852-2-0x0000000002240000-0x0000000002246000-memory.dmp

memory/852-3-0x0000000000400000-0x0000000000406000-memory.dmp

C:\Users\Admin\AppData\Local\Temp\rewok.exe

MD5 11964a9b6cfba36811d1d684bef72eaa
SHA1 5458addf44be51a158b3f3b3e16c29506ebde09f
SHA256 674d349b2b7bdd4be1d969e618107fceb3808e0064c96df90ee3ff8b54bb4d8a
SHA512 cc874f80dadd3a1ee2d109173e5d7423c1b4a9f8b16667603b79c1c9de335dab48b9952476d81ece5389e85fd7a76d70ecd8b99617cfcab312fd157105d95453

memory/3824-26-0x0000000002080000-0x0000000002086000-memory.dmp