Malware Analysis Report

2025-08-06 00:20

Sample ID 240528-a9xjvshf35
Target 2024-05-28_b8741809ef30f0c5fdbc8067af86518f_cryptolocker
SHA256 58bb3931e32bd0e05923489f47755c4f4e8c4ae2ca3f0b64aa4699508292e340
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

58bb3931e32bd0e05923489f47755c4f4e8c4ae2ca3f0b64aa4699508292e340

Threat Level: Known bad

The file 2024-05-28_b8741809ef30f0c5fdbc8067af86518f_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

Unsigned PE

Enumerates physical storage devices

Suspicious use of UnmapMainImage

Suspicious use of WriteProcessMemory

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-05-28 00:55

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

2024-05-28 00:55

Reported

2024-05-28 00:57

Platform

win7-20240508-en

Max time kernel

14s

Max time network

121s

Command Line

"C:\Users\Admin\AppData\Local\Temp\2024-05-28_b8741809ef30f0c5fdbc8067af86518f_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\2024-05-28_b8741809ef30f0c5fdbc8067af86518f_cryptolocker.exe N/A

Creates a large amount of network flows

discovery

Enumerates physical storage devices

Processes

C:\Users\Admin\AppData\Local\Temp\2024-05-28_b8741809ef30f0c5fdbc8067af86518f_cryptolocker.exe

"C:\Users\Admin\AppData\Local\Temp\2024-05-28_b8741809ef30f0c5fdbc8067af86518f_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/848-8-0x00000000003F0000-0x00000000003F6000-memory.dmp

memory/848-1-0x0000000000400000-0x0000000000406000-memory.dmp

memory/848-0-0x00000000003F0000-0x00000000003F6000-memory.dmp

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

MD5 18cdfca6b82c63cebf7c44f4367161de
SHA1 1ca476fcd4906d095a7ecdf8eeb2a1e2f6f9ef54
SHA256 81f92df47c58da83cc3e7a2132d8910a5ee4a07837e992d63481625723f7c813
SHA512 ce63abee689bfd6b4c49f5aa8dc31ea97d0be95afdea08e94541225ea35d4c3619f0bd43c82ae8611158e6fd60430f0aa16106951d6edf5132ada9568870a2df

memory/1808-23-0x0000000000380000-0x0000000000386000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-05-28 00:55

Reported

2024-05-28 00:57

Platform

win10v2004-20240508-en

Max time kernel

150s

Max time network

156s

Command Line

"C:\Users\Admin\AppData\Local\Temp\2024-05-28_b8741809ef30f0c5fdbc8067af86518f_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-1-5-21-4124900551-4068476067-3491212533-1000\Control Panel\International\Geo\Nation C:\Users\Admin\AppData\Local\Temp\2024-05-28_b8741809ef30f0c5fdbc8067af86518f_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\2024-05-28_b8741809ef30f0c5fdbc8067af86518f_cryptolocker.exe

"C:\Users\Admin\AppData\Local\Temp\2024-05-28_b8741809ef30f0c5fdbc8067af86518f_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 8.8.8.8.in-addr.arpa udp
US 8.8.8.8:53 storage-cabinets.info udp
US 8.8.8.8:53 196.249.167.52.in-addr.arpa udp
US 8.8.8.8:53 172.210.232.199.in-addr.arpa udp
US 8.8.8.8:53 2.159.190.20.in-addr.arpa udp
US 8.8.8.8:53 storage-cabinets.info udp
US 8.8.8.8:53 storage-cabinets.info udp
NL 23.62.61.97:443 www.bing.com tcp
US 8.8.8.8:53 209.205.72.20.in-addr.arpa udp
US 8.8.8.8:53 97.61.62.23.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 86.23.85.13.in-addr.arpa udp
US 8.8.8.8:53 171.39.242.20.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 storage-cabinets.info udp
US 8.8.8.8:53 21.236.111.52.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 tse1.mm.bing.net udp
US 204.79.197.200:443 tse1.mm.bing.net tcp
US 204.79.197.200:443 tse1.mm.bing.net tcp
US 204.79.197.200:443 tse1.mm.bing.net tcp
US 204.79.197.200:443 tse1.mm.bing.net tcp
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

Files

memory/1364-0-0x0000000002150000-0x0000000002156000-memory.dmp

memory/1364-8-0x0000000002150000-0x0000000002156000-memory.dmp

memory/1364-1-0x0000000000400000-0x0000000000406000-memory.dmp

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

MD5 18cdfca6b82c63cebf7c44f4367161de
SHA1 1ca476fcd4906d095a7ecdf8eeb2a1e2f6f9ef54
SHA256 81f92df47c58da83cc3e7a2132d8910a5ee4a07837e992d63481625723f7c813
SHA512 ce63abee689bfd6b4c49f5aa8dc31ea97d0be95afdea08e94541225ea35d4c3619f0bd43c82ae8611158e6fd60430f0aa16106951d6edf5132ada9568870a2df

memory/180-25-0x0000000002020000-0x0000000002026000-memory.dmp