Malware Analysis Report

2025-04-03 09:07

Sample ID 250305-r84efs1vdz
Target Winlocker.exe
SHA256 51c45fb238881bd25fd7435d8b8e44eee9cc56887a56a7e5f5bdef8ec8392465
Tags
bot blacknet darkcomet guest16 persistence rat trojan upx
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 Overview

score
10/10

SHA256

51c45fb238881bd25fd7435d8b8e44eee9cc56887a56a7e5f5bdef8ec8392465

Threat Level: Known bad

The file Winlocker.exe was found to be: Known bad.

Malicious Activity Summary

bot blacknet darkcomet guest16 persistence rat trojan upx

BlackNET payload

Darkcomet

Darkcomet family

BlackNET

Blacknet family

Checks computer location settings

Adds Run key to start application

UPX packed file

Enumerates physical storage devices

Unsigned PE

Suspicious behavior: EnumeratesProcesses

Suspicious use of AdjustPrivilegeToken

Suspicious use of SetWindowsHookEx

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2025-03-05 14:52

Signatures

BlackNET payload

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

Blacknet family

blacknet

Unsigned PE

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

Analysis: behavioral1

Detonation Overview

Submitted

2025-03-05 14:52

Reported

2025-03-05 14:54

Platform

win10ltsc2021-20250217-en

Max time kernel

3s

Max time network

37s

Command Line

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

Signatures

BlackNET

trojan blacknet

BlackNET payload

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

Blacknet family

blacknet

Darkcomet

trojan rat darkcomet

Darkcomet family

darkcomet

Checks computer location settings

Description Indicator Process Target
Key value queried \REGISTRY\USER\S-1-5-21-2501448743-3279416841-701563739-1000\Control Panel\International\Geo\Nation C:\Users\Admin\AppData\Local\Temp\Winlocker.exe N/A

Adds Run key to start application

persistence
Description Indicator Process Target
Set value (str) \REGISTRY\USER\S-1-5-21-2501448743-3279416841-701563739-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\a5b002eacf54590ec8401ff6d3f920ee = "C:\\Users\\Admin\\AppData\\Local\\Temp\\Winlocker.exe" C:\Users\Admin\AppData\Local\Temp\Winlocker.exe N/A
Set value (str) \REGISTRY\USER\S-1-5-21-2501448743-3279416841-701563739-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\a5b002eacf54590ec8401ff6d3f920ee = "C:\\Users\\Admin\\AppData\\Local\\Temp\\Microsoft\\MyClient\\jusched.exe" C:\Users\Admin\AppData\Local\Temp\Winlocker.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
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A

Enumerates physical storage devices

Suspicious behavior: EnumeratesProcesses

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

Suspicious use of AdjustPrivilegeToken

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

Suspicious use of SetWindowsHookEx

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

Processes

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

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

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

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

C:\Users\Admin\AppData\Local\Temp\Microsoft\MyClient\jusched.exe

"C:\Users\Admin\AppData\Local\Temp\Microsoft\MyClient\jusched.exe"

C:\Users\Admin\AppData\Local\Temp\WinlockerBuilderv5.exe

"C:\Users\Admin\AppData\Local\Temp\WinlockerBuilderv5.exe"

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

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

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

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

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

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

C:\Users\Admin\Documents\AudioDriver\taskhost.exe

"C:\Users\Admin\Documents\AudioDriver\taskhost.exe"

C:\Users\Admin\Documents\AudioDriver\taskhost.exe

"C:\Users\Admin\Documents\AudioDriver\taskhost.exe"

C:\Users\Admin\AppData\Local\Temp\WinlockerBuilderv5.exe

"C:\Users\Admin\AppData\Local\Temp\WinlockerBuilderv5.exe"

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

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

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

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

Network

Country Destination Domain Proto
US 8.8.8.8:53 f0483357.xsph.ru udp
US 8.8.8.8:53 f0483357.xsph.ru udp
US 8.8.8.8:53 gameservice.ddns.net udp
US 8.8.8.8:53 f0483357.xsph.ru udp
US 8.8.8.8:53 f0483357.xsph.ru udp
US 8.8.8.8:53 f0483357.xsph.ru udp
US 8.8.8.8:53 f0483357.xsph.ru udp
US 8.8.8.8:53 f0483357.xsph.ru udp

Files

memory/1948-0-0x00007FF9BFAC5000-0x00007FF9BFAC6000-memory.dmp

memory/1948-1-0x000000001BF80000-0x000000001C026000-memory.dmp

memory/1948-2-0x00007FF9BF810000-0x00007FF9C01B1000-memory.dmp

memory/1948-3-0x000000001C5A0000-0x000000001CA6E000-memory.dmp

memory/1948-4-0x00007FF9BF810000-0x00007FF9C01B1000-memory.dmp

memory/1948-5-0x000000001CB20000-0x000000001CBBC000-memory.dmp

memory/1948-6-0x00000000019D0000-0x00000000019D8000-memory.dmp

memory/1948-7-0x000000001CC80000-0x000000001CCCC000-memory.dmp

memory/1948-8-0x00007FF9BF810000-0x00007FF9C01B1000-memory.dmp

memory/1948-9-0x00007FF9BF810000-0x00007FF9C01B1000-memory.dmp

memory/1948-10-0x00007FF9BF810000-0x00007FF9C01B1000-memory.dmp

memory/1948-11-0x0000000020C00000-0x0000000020C62000-memory.dmp

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

MD5 2df0daacf8be5126ddbaa7ba9a83be58
SHA1 0889fcd78f5bf71ca04280fe97b7507b6b114ba3
SHA256 0936e508e142466b6d83e49b27513be2207822f91ac2d038023a86d6ccd29b2a
SHA512 0348f7511803198d5d81b10bac08b9e9e79bfd1d193c9a72b1bf3883bd49d18ec21a998e4a056206fac539c73843b31c10437838eb38746bd062e682f2df120e

C:\Users\Admin\AppData\Local\Temp\Microsoft\MyClient\jusched.exe

MD5 5891817266ffedc10d4a84a3bd483239
SHA1 b59d365a91b50ec55ccc1c1b2a70cbf858382aa3
SHA256 51c45fb238881bd25fd7435d8b8e44eee9cc56887a56a7e5f5bdef8ec8392465
SHA512 517c5d785f069ce566c1d89fcc998968a5cdfc6d85bcc7e42cc2e720b4be9b543065cc1c7967635948595fdbb4af3fc7714c8b90aa6035953bca40cba7272c23

C:\Users\Admin\AppData\Local\Temp\WinlockerBuilderv5.exe

MD5 0df533cb9a581de63e3522954a681603
SHA1 be46afa245289e0d9a84bd1fd1faea8d8c96da5e
SHA256 e3570b276e526f6fb6a289da32583b36cfbd98ec2f59d09c0243fbd0fc0805a3
SHA512 c973e3a8476879dad79f8b37f476d379b90f27cf64ecd359256df94fb811d69226dc50d1e8168d34787cc2d6abf407d8097e37cd60155650dad007a68263661e

memory/1496-44-0x0000000000400000-0x0000000000C89000-memory.dmp

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

MD5 0d833c6509f350e0a15492597df2bda6
SHA1 1f77b7eb4410f6e1c0e0f7b971a3c98b3f0a5f9f
SHA256 d280fdf95c57cba365c15fc9c6371ada79734480812497c2244246cfdac52ca7
SHA512 9e7ec8f4a756a2546c64850e0ca390788b9817984c1a91af55ffddfd3a010d7629478c2665c03a8a15d46377d66223f6937ac9d8d3d6bda5f9a1ee549ef16118

memory/4024-55-0x0000000000400000-0x00000000004B2000-memory.dmp

memory/4024-57-0x0000000000400000-0x00000000004B2000-memory.dmp

memory/3440-58-0x0000000000400000-0x000000000052A000-memory.dmp

memory/1948-60-0x00007FF9BF810000-0x00007FF9C01B1000-memory.dmp

memory/436-76-0x0000000000400000-0x000000000052A000-memory.dmp

memory/1220-78-0x0000000000400000-0x00000000004B2000-memory.dmp

memory/2760-81-0x0000000000400000-0x0000000000C89000-memory.dmp

memory/1220-77-0x0000000000400000-0x00000000004B2000-memory.dmp

memory/4024-86-0x0000000000400000-0x00000000004B2000-memory.dmp

memory/4204-84-0x0000000000400000-0x000000000052A000-memory.dmp

memory/2480-87-0x0000000000400000-0x00000000004B2000-memory.dmp

memory/1496-90-0x0000000000400000-0x0000000000C89000-memory.dmp

memory/2760-93-0x0000000000400000-0x0000000000C89000-memory.dmp

memory/1220-92-0x0000000000400000-0x00000000004B2000-memory.dmp

memory/2760-94-0x0000000000400000-0x0000000000C89000-memory.dmp

memory/1496-96-0x0000000000400000-0x0000000000C89000-memory.dmp

memory/2760-97-0x0000000000400000-0x0000000000C89000-memory.dmp

memory/1496-99-0x0000000000400000-0x0000000000C89000-memory.dmp