Malware Analysis Report

2025-03-15 01:12

Sample ID 250223-tlyxkaskcz
Target SilverClient.exe
SHA256 319fb56f8db50bcf490d25f374acf3d7199e66ec1a8d192a97eb5ca7e767bd6b
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

319fb56f8db50bcf490d25f374acf3d7199e66ec1a8d192a97eb5ca7e767bd6b

Threat Level: Known bad

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

Malicious Activity Summary

silverrat execution trojan

Silverrat family

SilverRat

Checks computer location settings

Command and Scripting Interpreter: PowerShell

Enumerates physical storage devices

Unsigned PE

Uses Task Scheduler COM API

Scheduled Task/Job: Scheduled Task

Suspicious behavior: EnumeratesProcesses

Suspicious use of AdjustPrivilegeToken

Suspicious use of SetWindowsHookEx

Suspicious use of WriteProcessMemory

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2025-02-23 16:09

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 16:09

Reported

2025-02-23 16:11

Platform

win7-20241010-en

Max time kernel

149s

Max time network

150s

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
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

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 1056 wrote to memory of 2768 N/A C:\Users\Admin\AppData\Local\Temp\SilverClient.exe C:\Windows\system32\schtasks.exe
PID 1056 wrote to memory of 2768 N/A C:\Users\Admin\AppData\Local\Temp\SilverClient.exe C:\Windows\system32\schtasks.exe
PID 1056 wrote to memory of 2768 N/A C:\Users\Admin\AppData\Local\Temp\SilverClient.exe C:\Windows\system32\schtasks.exe
PID 1056 wrote to memory of 2896 N/A C:\Users\Admin\AppData\Local\Temp\SilverClient.exe C:\Windows\system32\schtasks.exe
PID 1056 wrote to memory of 2896 N/A C:\Users\Admin\AppData\Local\Temp\SilverClient.exe C:\Windows\system32\schtasks.exe
PID 1056 wrote to memory of 2896 N/A C:\Users\Admin\AppData\Local\Temp\SilverClient.exe C:\Windows\system32\schtasks.exe
PID 1056 wrote to memory of 2772 N/A C:\Users\Admin\AppData\Local\Temp\SilverClient.exe C:\Windows\system32\schtasks.exe
PID 1056 wrote to memory of 2772 N/A C:\Users\Admin\AppData\Local\Temp\SilverClient.exe C:\Windows\system32\schtasks.exe
PID 1056 wrote to memory of 2772 N/A C:\Users\Admin\AppData\Local\Temp\SilverClient.exe C:\Windows\system32\schtasks.exe
PID 1056 wrote to memory of 2360 N/A C:\Users\Admin\AppData\Local\Temp\SilverClient.exe C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
PID 1056 wrote to memory of 2360 N/A C:\Users\Admin\AppData\Local\Temp\SilverClient.exe C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
PID 1056 wrote to memory of 2360 N/A C:\Users\Admin\AppData\Local\Temp\SilverClient.exe C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
PID 1056 wrote to memory of 2116 N/A C:\Users\Admin\AppData\Local\Temp\SilverClient.exe C:\Windows\System32\schtasks.exe
PID 1056 wrote to memory of 2116 N/A C:\Users\Admin\AppData\Local\Temp\SilverClient.exe C:\Windows\System32\schtasks.exe
PID 1056 wrote to memory of 2116 N/A C:\Users\Admin\AppData\Local\Temp\SilverClient.exe C:\Windows\System32\schtasks.exe

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\schtasks.exe

"schtasks.exe" /query /TN SilverClient.exe

C:\Windows\system32\schtasks.exe

"schtasks.exe" /Create /SC ONCE /TN "SilverClient.exe" /TR "C:\Users\Admin\AppData\Local\Temp\SilverClient.exe \"\SilverClient.exe\" /AsAdmin" /ST 00:01 /IT /F /RL HIGHEST

C:\Windows\system32\schtasks.exe

"schtasks.exe" /query /TN 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
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/1056-0-0x000007FEF4F13000-0x000007FEF4F14000-memory.dmp

memory/1056-1-0x000000013FDB0000-0x000000013FDBE000-memory.dmp

memory/1056-2-0x000007FEF4F10000-0x000007FEF58FC000-memory.dmp

memory/2360-7-0x000000001B540000-0x000000001B822000-memory.dmp

memory/2360-8-0x0000000002720000-0x0000000002728000-memory.dmp

C:\Users\Admin\AppData\Local\Temp\CabF614.tmp

MD5 49aebf8cbd62d92ac215b2923fb1b9f5
SHA1 1723be06719828dda65ad804298d0431f6aff976
SHA256 b33efcb95235b98b48508e019afa4b7655e80cf071defabd8b2123fc8b29307f
SHA512 bf86116b015fb56709516d686e168e7c9c68365136231cc51d0b6542ae95323a71d2c7acec84aad7dcecc2e410843f6d82a0a6d51b9acfc721a9c84fdd877b5b

memory/1056-25-0x000007FEF4F13000-0x000007FEF4F14000-memory.dmp

memory/1056-26-0x000007FEF4F10000-0x000007FEF58FC000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2025-02-23 16:09

Reported

2025-02-23 16:11

Platform

win10v2004-20250217-en

Max time kernel

148s

Max time network

152s

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-1-5-21-925314154-1797147466-1467878628-1000\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
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\schtasks.exe

"schtasks.exe" /query /TN SilverClient.exe

C:\Windows\SYSTEM32\schtasks.exe

"schtasks.exe" /Create /SC ONCE /TN "SilverClient.exe" /TR "C:\Users\Admin\AppData\Local\Temp\SilverClient.exe \"\SilverClient.exe\" /AsAdmin" /ST 00:01 /IT /F /RL HIGHEST

C:\Windows\SYSTEM32\schtasks.exe

"schtasks.exe" /query /TN 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 52.168.117.169:443 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
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 150.171.28.10:443 tcp
US 150.171.28.10:443 tcp
US 150.171.28.10:443 tcp
US 150.171.28.10:443 tcp
US 150.171.28.10:443 tse1.mm.bing.net 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/4988-0-0x00007FFC7F7E3000-0x00007FFC7F7E5000-memory.dmp

memory/4988-1-0x0000000000DB0000-0x0000000000DBE000-memory.dmp

memory/4988-2-0x00007FFC7F7E0000-0x00007FFC802A1000-memory.dmp

memory/1988-8-0x0000011EABB60000-0x0000011EABB82000-memory.dmp

C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_biogjjhu.xte.ps1

MD5 d17fe0a3f47be24a6453e9ef58c94641
SHA1 6ab83620379fc69f80c0242105ddffd7d98d5d9d
SHA256 96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
SHA512 5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

memory/4988-15-0x00007FFC7F7E3000-0x00007FFC7F7E5000-memory.dmp

memory/4988-16-0x00007FFC7F7E0000-0x00007FFC802A1000-memory.dmp