Malware Analysis Report

2025-03-15 01:12

Sample ID 250223-s2nwvstkz9
Target SilverClient.exe
SHA256 df9fc08c25a7e1e6578a2a3a89d6c40210164f8090733a7b42c7b013b156eeef
Tags
silverrat execution trojan
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

df9fc08c25a7e1e6578a2a3a89d6c40210164f8090733a7b42c7b013b156eeef

Threat Level: Known bad

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

Malicious Activity Summary

silverrat execution trojan

SilverRat

Silverrat family

Checks computer location settings

Command and Scripting Interpreter: PowerShell

Unsigned PE

Enumerates physical storage devices

Suspicious behavior: EnumeratesProcesses

Suspicious use of WriteProcessMemory

Uses Task Scheduler COM API

Scheduled Task/Job: Scheduled Task

Suspicious use of AdjustPrivilegeToken

Suspicious use of SetWindowsHookEx

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2025-02-23 15:37

Signatures

Silverrat family

silverrat

Unsigned PE

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

Analysis: behavioral1

Detonation Overview

Submitted

2025-02-23 15:37

Reported

2025-02-23 15:39

Platform

win7-20240903-en

Max time kernel

147s

Max time network

149s

Command Line

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

Signatures

SilverRat

trojan silverrat

Silverrat family

silverrat

Command and Scripting Interpreter: PowerShell

execution
Description Indicator Process Target
N/A N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe N/A

Enumerates physical storage devices

Scheduled Task/Job: Scheduled Task

persistence execution
Description Indicator Process Target
N/A N/A C:\Windows\System32\schtasks.exe N/A

Suspicious behavior: EnumeratesProcesses

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\SilverClient.exe N/A
N/A N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\SilverClient.exe N/A
Token: SeDebugPrivilege N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe N/A

Suspicious use of SetWindowsHookEx

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

Uses Task Scheduler COM API

persistence

Processes

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

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

C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe

"C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Set-MpPreference -ExclusionExtension exe,bat,dll,ps1;exit

C:\Windows\System32\schtasks.exe

"C:\Windows\System32\schtasks.exe" /create /sc daily /tn "_Task-DAILY-21PM" /TR "%MyFile%" /ST 21:00

Network

Country Destination Domain Proto
US 8.8.8.8:53 paul-nw.gl.at.ply.gg udp
US 147.185.221.25:51413 paul-nw.gl.at.ply.gg tcp
US 147.185.221.25:51413 paul-nw.gl.at.ply.gg tcp
US 147.185.221.25:51413 paul-nw.gl.at.ply.gg tcp
US 147.185.221.25:51413 paul-nw.gl.at.ply.gg tcp
US 147.185.221.25:51413 paul-nw.gl.at.ply.gg tcp
US 147.185.221.25:51413 paul-nw.gl.at.ply.gg tcp
US 147.185.221.25:51413 paul-nw.gl.at.ply.gg tcp
US 147.185.221.25:51413 paul-nw.gl.at.ply.gg tcp
US 147.185.221.25:51413 paul-nw.gl.at.ply.gg tcp
US 147.185.221.25:51413 paul-nw.gl.at.ply.gg tcp
US 147.185.221.25:51413 paul-nw.gl.at.ply.gg tcp
US 147.185.221.25:51413 paul-nw.gl.at.ply.gg tcp
US 147.185.221.25:51413 paul-nw.gl.at.ply.gg tcp
US 147.185.221.25:51413 paul-nw.gl.at.ply.gg tcp
US 147.185.221.25:51413 paul-nw.gl.at.ply.gg tcp
US 147.185.221.25:51413 paul-nw.gl.at.ply.gg tcp
US 147.185.221.25:51413 paul-nw.gl.at.ply.gg tcp
US 147.185.221.25:51413 paul-nw.gl.at.ply.gg tcp
US 147.185.221.25:51413 paul-nw.gl.at.ply.gg tcp
US 147.185.221.25:51413 paul-nw.gl.at.ply.gg tcp
US 147.185.221.25:51413 paul-nw.gl.at.ply.gg tcp
US 147.185.221.25:51413 paul-nw.gl.at.ply.gg tcp

Files

memory/1628-0-0x000007FEF5D13000-0x000007FEF5D14000-memory.dmp

memory/1628-1-0x000000013F860000-0x000000013F86E000-memory.dmp

memory/1628-2-0x000007FEF5D10000-0x000007FEF66FC000-memory.dmp

memory/1592-7-0x000000001B500000-0x000000001B7E2000-memory.dmp

memory/1592-8-0x00000000022D0000-0x00000000022D8000-memory.dmp

memory/1628-9-0x000007FEF5D13000-0x000007FEF5D14000-memory.dmp

memory/1628-10-0x000007FEF5D10000-0x000007FEF66FC000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2025-02-23 15:37

Reported

2025-02-23 15:40

Platform

win10v2004-20250217-en

Max time kernel

146s

Max time network

150s

Command Line

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

Signatures

SilverRat

trojan silverrat

Silverrat family

silverrat

Checks computer location settings

Description Indicator Process Target
Key value queried \REGISTRY\USER\S-1-5-21-1170604239-850860757-3112005715-1000\Control Panel\International\Geo\Nation C:\Users\Admin\AppData\Local\Temp\SilverClient.exe N/A

Command and Scripting Interpreter: PowerShell

execution
Description Indicator Process Target
N/A N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe N/A

Enumerates physical storage devices

Scheduled Task/Job: Scheduled Task

persistence execution
Description Indicator Process Target
N/A N/A C:\Windows\System32\schtasks.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\SilverClient.exe N/A
Token: SeDebugPrivilege N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe N/A

Suspicious use of SetWindowsHookEx

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

Uses Task Scheduler COM API

persistence

Processes

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

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

C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe

"C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Set-MpPreference -ExclusionExtension exe,bat,dll,ps1;exit

C:\Windows\System32\schtasks.exe

"C:\Windows\System32\schtasks.exe" /create /sc daily /tn "_Task-DAILY-21PM" /TR "%MyFile%" /ST 21:00

Network

Country Destination Domain Proto
US 8.8.8.8:53 paul-nw.gl.at.ply.gg udp
US 147.185.221.25:51413 paul-nw.gl.at.ply.gg tcp
US 8.8.8.8:53 g.bing.com udp
US 150.171.27.10:443 g.bing.com tcp
US 147.185.221.25:51413 paul-nw.gl.at.ply.gg tcp
US 147.185.221.25:51413 paul-nw.gl.at.ply.gg tcp
US 147.185.221.25:51413 paul-nw.gl.at.ply.gg tcp
US 147.185.221.25:51413 paul-nw.gl.at.ply.gg tcp
US 147.185.221.25:51413 paul-nw.gl.at.ply.gg tcp
US 147.185.221.25:51413 paul-nw.gl.at.ply.gg tcp
US 147.185.221.25:51413 paul-nw.gl.at.ply.gg tcp
US 147.185.221.25:51413 paul-nw.gl.at.ply.gg tcp
US 147.185.221.25:51413 paul-nw.gl.at.ply.gg tcp
US 147.185.221.25:51413 paul-nw.gl.at.ply.gg tcp
US 147.185.221.25:51413 paul-nw.gl.at.ply.gg tcp
US 147.185.221.25:51413 paul-nw.gl.at.ply.gg tcp
US 147.185.221.25:51413 paul-nw.gl.at.ply.gg tcp
US 147.185.221.25:51413 paul-nw.gl.at.ply.gg tcp
US 147.185.221.25:51413 paul-nw.gl.at.ply.gg tcp
US 147.185.221.25:51413 paul-nw.gl.at.ply.gg tcp
US 147.185.221.25:51413 paul-nw.gl.at.ply.gg tcp
US 147.185.221.25:51413 paul-nw.gl.at.ply.gg tcp
US 147.185.221.25:51413 paul-nw.gl.at.ply.gg tcp

Files

memory/1520-0-0x00007FFD66933000-0x00007FFD66935000-memory.dmp

memory/1520-1-0x0000000000550000-0x000000000055E000-memory.dmp

memory/1520-2-0x00007FFD66930000-0x00007FFD673F1000-memory.dmp

memory/5076-3-0x00007FFD66930000-0x00007FFD673F1000-memory.dmp

C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_hjohnzro.thj.ps1

MD5 d17fe0a3f47be24a6453e9ef58c94641
SHA1 6ab83620379fc69f80c0242105ddffd7d98d5d9d
SHA256 96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
SHA512 5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

memory/5076-14-0x00007FFD66930000-0x00007FFD673F1000-memory.dmp

memory/5076-13-0x000001F35B880000-0x000001F35B8A2000-memory.dmp

memory/5076-15-0x00007FFD66930000-0x00007FFD673F1000-memory.dmp

memory/5076-18-0x000001F373D30000-0x000001F373F4C000-memory.dmp

memory/5076-19-0x00007FFD66930000-0x00007FFD673F1000-memory.dmp

memory/1520-20-0x00007FFD66933000-0x00007FFD66935000-memory.dmp

memory/1520-21-0x00007FFD66930000-0x00007FFD673F1000-memory.dmp