Malware Analysis Report

2025-08-05 09:28

Sample ID 240223-pm5paaff5y
Target 2024-02-23_1bd5cb923fea1755e53d319b1c49d7be_cryptolocker
SHA256 fcb5bc70a3b13a8135442a155b8f999581767d84b8cf3557dc6bab6306185ca7
Tags
discovery
score
10/10

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
10/10

SHA256

fcb5bc70a3b13a8135442a155b8f999581767d84b8cf3557dc6bab6306185ca7

Threat Level: Known bad

The file 2024-02-23_1bd5cb923fea1755e53d319b1c49d7be_cryptolocker was found to be: Known bad.

Malicious Activity Summary

discovery

Detection of CryptoLocker Variants

Detection of CryptoLocker Variants

Executes dropped EXE

Checks computer location settings

Loads dropped DLL

Creates a large amount of network flows

Enumerates physical storage devices

Unsigned PE

Suspicious use of UnmapMainImage

Suspicious use of WriteProcessMemory

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-02-23 12:27

Signatures

Detection of CryptoLocker Variants

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

2024-02-23 12:27

Reported

2024-02-23 12:30

Platform

win7-20240221-en

Max time kernel

3s

Max time network

71s

Command Line

"C:\Users\Admin\AppData\Local\Temp\2024-02-23_1bd5cb923fea1755e53d319b1c49d7be_cryptolocker.exe"

Signatures

Detection of CryptoLocker Variants

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

Executes dropped EXE

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

Loads dropped DLL

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\2024-02-23_1bd5cb923fea1755e53d319b1c49d7be_cryptolocker.exe N/A

Creates a large amount of network flows

discovery

Enumerates physical storage devices

Processes

C:\Users\Admin\AppData\Local\Temp\2024-02-23_1bd5cb923fea1755e53d319b1c49d7be_cryptolocker.exe

"C:\Users\Admin\AppData\Local\Temp\2024-02-23_1bd5cb923fea1755e53d319b1c49d7be_cryptolocker.exe"

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

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

Network

Country Destination Domain Proto
US 8.8.8.8:53 storage-cabinets.info udp

Files

memory/3068-0-0x00000000003F0000-0x00000000003F6000-memory.dmp

memory/3068-1-0x0000000000400000-0x0000000000406000-memory.dmp

memory/3068-8-0x00000000003F0000-0x00000000003F6000-memory.dmp

\Users\Admin\AppData\Local\Temp\retln.exe

MD5 7d40a10a9bb27fd90e190868a844a024
SHA1 23d24b050f577c6e3e0eced626c43e7dcbd9a4b3
SHA256 5837ded4dfaef4379e46713d72516953a87b2a49adc2e51ecc710066eb494c64
SHA512 ebb36f7a13068c188d25019098d5f9f94b83a2f95f4ed548cc243eee578c2fa99054ce30f673cb2fdbd3f06cdd4020b746e4479c8cf3ffed30ccf6886e2121ec

memory/1988-23-0x0000000000280000-0x0000000000286000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-02-23 12:27

Reported

2024-02-23 12:30

Platform

win10v2004-20240221-en

Max time kernel

145s

Max time network

150s

Command Line

"C:\Users\Admin\AppData\Local\Temp\2024-02-23_1bd5cb923fea1755e53d319b1c49d7be_cryptolocker.exe"

Signatures

Detection of CryptoLocker Variants

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

Checks computer location settings

Description Indicator Process Target
Key value queried \REGISTRY\USER\S-1-5-21-3316742141-2240921845-2885234760-1000\Control Panel\International\Geo\Nation C:\Users\Admin\AppData\Local\Temp\2024-02-23_1bd5cb923fea1755e53d319b1c49d7be_cryptolocker.exe N/A

Executes dropped EXE

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

Enumerates physical storage devices

Processes

C:\Users\Admin\AppData\Local\Temp\2024-02-23_1bd5cb923fea1755e53d319b1c49d7be_cryptolocker.exe

"C:\Users\Admin\AppData\Local\Temp\2024-02-23_1bd5cb923fea1755e53d319b1c49d7be_cryptolocker.exe"

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

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

Network

Country Destination Domain Proto
US 8.8.8.8:53 storage-cabinets.info udp
US 8.8.8.8:53 16.53.126.40.in-addr.arpa udp
US 8.8.8.8:53 176.178.17.96.in-addr.arpa udp
US 8.8.8.8:53 9.228.82.20.in-addr.arpa udp
US 8.8.8.8:53 g.bing.com udp
US 204.79.197.200:443 g.bing.com tcp
US 8.8.8.8:53 41.110.16.96.in-addr.arpa udp
US 8.8.8.8:53 200.197.79.204.in-addr.arpa udp
US 8.8.8.8:53 storage-cabinets.info udp
US 8.8.8.8:53 storage-cabinets.info udp
US 8.8.8.8:53 storage-cabinets.info udp
US 8.8.8.8:53 storage-cabinets.info udp
US 8.8.8.8:53 storage-cabinets.info udp
US 8.8.8.8:53 storage-cabinets.info udp
US 8.8.8.8:53 183.59.114.20.in-addr.arpa udp
US 8.8.8.8:53 15.164.165.52.in-addr.arpa udp
US 8.8.8.8:53 18.134.221.88.in-addr.arpa udp
US 8.8.8.8:53 storage-cabinets.info udp
US 8.8.8.8:53 storage-cabinets.info udp
US 8.8.8.8:53 storage-cabinets.info udp
US 8.8.8.8:53 storage-cabinets.info udp
US 8.8.8.8:53 storage-cabinets.info udp
US 8.8.8.8:53 storage-cabinets.info udp
US 8.8.8.8:53 172.178.17.96.in-addr.arpa udp
US 8.8.8.8:53 storage-cabinets.info udp
US 8.8.8.8:53 storage-cabinets.info udp
US 8.8.8.8:53 storage-cabinets.info udp
US 8.8.8.8:53 storage-cabinets.info udp
US 8.8.8.8:53 storage-cabinets.info udp
US 8.8.8.8:53 storage-cabinets.info udp
US 8.8.8.8:53 19.229.111.52.in-addr.arpa udp
US 8.8.8.8:53 194.178.17.96.in-addr.arpa udp
US 8.8.8.8:53 storage-cabinets.info udp
US 8.8.8.8:53 storage-cabinets.info udp
US 8.8.8.8:53 storage-cabinets.info udp
US 8.8.8.8:53 storage-cabinets.info udp
US 8.8.8.8:53 storage-cabinets.info udp
US 8.8.8.8:53 storage-cabinets.info udp
US 8.8.8.8:53 storage-cabinets.info udp
US 8.8.8.8:53 storage-cabinets.info udp
US 8.8.8.8:53 storage-cabinets.info udp
US 8.8.8.8:53 storage-cabinets.info udp
US 8.8.8.8:53 storage-cabinets.info udp
US 8.8.8.8:53 48.192.11.51.in-addr.arpa udp

Files

memory/3288-0-0x0000000002350000-0x0000000002356000-memory.dmp

memory/3288-1-0x0000000002350000-0x0000000002356000-memory.dmp

memory/3288-2-0x0000000000400000-0x0000000000406000-memory.dmp

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

MD5 7d40a10a9bb27fd90e190868a844a024
SHA1 23d24b050f577c6e3e0eced626c43e7dcbd9a4b3
SHA256 5837ded4dfaef4379e46713d72516953a87b2a49adc2e51ecc710066eb494c64
SHA512 ebb36f7a13068c188d25019098d5f9f94b83a2f95f4ed548cc243eee578c2fa99054ce30f673cb2fdbd3f06cdd4020b746e4479c8cf3ffed30ccf6886e2121ec

memory/456-20-0x0000000000750000-0x0000000000756000-memory.dmp