Malware Analysis Report

2025-03-15 01:11

Sample ID 250223-svn82stjx7
Target SilverClient.exe
SHA256 df9fc08c25a7e1e6578a2a3a89d6c40210164f8090733a7b42c7b013b156eeef
Tags
silverrat execution persistence 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 persistence trojan

Silverrat family

SilverRat

Boot or Logon Autostart Execution: Active Setup

Checks computer location settings

Command and Scripting Interpreter: PowerShell

Modifies WinLogon

Enumerates physical storage devices

Unsigned PE

Suspicious use of SetWindowsHookEx

Suspicious use of WriteProcessMemory

Modifies registry class

Suspicious use of AdjustPrivilegeToken

Uses Task Scheduler COM API

Suspicious behavior: EnumeratesProcesses

Suspicious use of FindShellTrayWindow

Scheduled Task/Job: Scheduled Task

Suspicious behavior: GetForegroundWindowSpam

Suspicious use of SendNotifyMessage

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2025-02-23 15:26

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 15:26

Reported

2025-02-23 15:29

Platform

win7-20241010-en

Max time kernel

149s

Max time network

157s

Command Line

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

Signatures

SilverRat

trojan silverrat

Silverrat family

silverrat

Boot or Logon Autostart Execution: Active Setup

persistence
Description Indicator Process Target
Key created \REGISTRY\USER\S-1-5-21-3692679935-4019334568-335155002-1000\Software\Microsoft\Active Setup\Installed Components C:\Windows\explorer.exe N/A
Key created \REGISTRY\USER\S-1-5-21-3692679935-4019334568-335155002-1000\Software\Microsoft\Active Setup\Installed Components C:\Windows\explorer.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

Modifies WinLogon

persistence
Description Indicator Process Target
Key created \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\SpecialAccounts\UserList C:\Users\Admin\AppData\Local\Temp\SilverClient.exe N/A
Key created \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\SpecialAccounts C:\Users\Admin\AppData\Local\Temp\SilverClient.exe N/A

Enumerates physical storage devices

Modifies registry class

Description Indicator Process Target
Key created \REGISTRY\USER\S-1-5-21-3692679935-4019334568-335155002-1000_CLASSES\Local Settings\Software\Microsoft\Windows\Shell\BagMRU C:\Windows\explorer.exe N/A
Set value (data) \REGISTRY\USER\S-1-5-21-3692679935-4019334568-335155002-1000_CLASSES\Local Settings\Software\Microsoft\Windows\Shell\BagMRU\MRUListEx = ffffffff C:\Windows\explorer.exe N/A
Key created \REGISTRY\USER\S-1-5-21-3692679935-4019334568-335155002-1000_Classes\Local Settings C:\Windows\explorer.exe N/A
Key created \REGISTRY\USER\S-1-5-21-3692679935-4019334568-335155002-1000_CLASSES\Local Settings\Software\Microsoft\Windows\Shell\BagMRU C:\Windows\explorer.exe N/A
Set value (data) \REGISTRY\USER\S-1-5-21-3692679935-4019334568-335155002-1000_CLASSES\Local Settings\Software\Microsoft\Windows\Shell\BagMRU\NodeSlots C:\Windows\explorer.exe N/A
Set value (data) \REGISTRY\USER\S-1-5-21-3692679935-4019334568-335155002-1000_CLASSES\Local Settings\Software\Microsoft\Windows\Shell\BagMRU\MRUListEx = ffffffff C:\Windows\explorer.exe N/A
Key created \REGISTRY\USER\S-1-5-21-3692679935-4019334568-335155002-1000_Classes\Local Settings C:\Windows\explorer.exe N/A
Key created \REGISTRY\USER\S-1-5-21-3692679935-4019334568-335155002-1000_CLASSES\Local Settings\Software\Microsoft\Windows\Shell C:\Windows\explorer.exe N/A
Set value (data) \REGISTRY\USER\S-1-5-21-3692679935-4019334568-335155002-1000_CLASSES\Local Settings\Software\Microsoft\Windows\Shell\BagMRU\NodeSlots C:\Windows\explorer.exe N/A
Key created \REGISTRY\USER\S-1-5-21-3692679935-4019334568-335155002-1000_CLASSES\Local Settings\Software\Microsoft\Windows\Shell C:\Windows\explorer.exe N/A

Scheduled Task/Job: Scheduled Task

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

Suspicious behavior: GetForegroundWindowSpam

Description Indicator Process Target
N/A N/A C:\Windows\explorer.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
Token: SeShutdownPrivilege N/A C:\Windows\explorer.exe N/A
Token: SeShutdownPrivilege N/A C:\Windows\explorer.exe N/A
Token: SeShutdownPrivilege N/A C:\Windows\explorer.exe N/A
Token: SeShutdownPrivilege N/A C:\Windows\explorer.exe N/A
Token: SeShutdownPrivilege N/A C:\Windows\explorer.exe N/A
Token: SeShutdownPrivilege N/A C:\Windows\explorer.exe N/A
Token: SeShutdownPrivilege N/A C:\Windows\explorer.exe N/A
Token: SeShutdownPrivilege N/A C:\Windows\explorer.exe N/A
Token: 33 N/A C:\Windows\system32\AUDIODG.EXE N/A
Token: SeIncBasePriorityPrivilege N/A C:\Windows\system32\AUDIODG.EXE N/A
Token: 33 N/A C:\Windows\system32\AUDIODG.EXE N/A
Token: SeIncBasePriorityPrivilege N/A C:\Windows\system32\AUDIODG.EXE N/A
Token: SeShutdownPrivilege N/A C:\Windows\explorer.exe N/A
Token: SeShutdownPrivilege N/A C:\Windows\explorer.exe N/A
Token: SeShutdownPrivilege N/A C:\Windows\explorer.exe N/A
Token: SeShutdownPrivilege N/A C:\Windows\explorer.exe N/A
Token: SeShutdownPrivilege N/A C:\Windows\explorer.exe N/A
Token: SeShutdownPrivilege N/A C:\Windows\explorer.exe N/A
Token: SeShutdownPrivilege N/A C:\Windows\explorer.exe N/A
Token: SeShutdownPrivilege N/A C:\Windows\explorer.exe N/A
Token: SeShutdownPrivilege N/A C:\Windows\explorer.exe N/A
Token: SeShutdownPrivilege N/A C:\Windows\explorer.exe N/A
Token: SeShutdownPrivilege N/A C:\Windows\explorer.exe N/A
Token: SeShutdownPrivilege N/A C:\Windows\explorer.exe N/A
Token: SeShutdownPrivilege N/A C:\Windows\explorer.exe N/A

Suspicious use of FindShellTrayWindow

Description Indicator Process Target
N/A N/A C:\Windows\explorer.exe N/A
N/A N/A C:\Windows\explorer.exe N/A
N/A N/A C:\Windows\explorer.exe N/A
N/A N/A C:\Windows\explorer.exe N/A
N/A N/A C:\Windows\explorer.exe N/A
N/A N/A C:\Windows\explorer.exe N/A
N/A N/A C:\Windows\explorer.exe N/A
N/A N/A C:\Windows\explorer.exe N/A
N/A N/A C:\Windows\explorer.exe N/A
N/A N/A C:\Windows\explorer.exe N/A
N/A N/A C:\Windows\explorer.exe N/A
N/A N/A C:\Windows\explorer.exe N/A
N/A N/A C:\Windows\explorer.exe N/A
N/A N/A C:\Windows\explorer.exe N/A
N/A N/A C:\Windows\explorer.exe N/A
N/A N/A C:\Windows\explorer.exe N/A
N/A N/A C:\Windows\explorer.exe N/A
N/A N/A C:\Windows\explorer.exe N/A
N/A N/A C:\Windows\explorer.exe N/A
N/A N/A C:\Windows\explorer.exe N/A
N/A N/A C:\Windows\explorer.exe N/A
N/A N/A C:\Windows\explorer.exe N/A
N/A N/A C:\Windows\explorer.exe N/A
N/A N/A C:\Windows\explorer.exe N/A
N/A N/A C:\Windows\explorer.exe N/A
N/A N/A C:\Windows\explorer.exe N/A
N/A N/A C:\Windows\explorer.exe N/A
N/A N/A C:\Windows\explorer.exe N/A
N/A N/A C:\Windows\explorer.exe N/A
N/A N/A C:\Windows\explorer.exe N/A
N/A N/A C:\Windows\explorer.exe N/A
N/A N/A C:\Windows\explorer.exe N/A
N/A N/A C:\Windows\explorer.exe N/A
N/A N/A C:\Windows\explorer.exe N/A
N/A N/A C:\Windows\explorer.exe N/A
N/A N/A C:\Windows\explorer.exe N/A
N/A N/A C:\Windows\explorer.exe N/A
N/A N/A C:\Windows\explorer.exe N/A
N/A N/A C:\Windows\explorer.exe N/A
N/A N/A C:\Windows\explorer.exe N/A
N/A N/A C:\Windows\explorer.exe N/A
N/A N/A C:\Windows\explorer.exe N/A
N/A N/A C:\Windows\explorer.exe N/A
N/A N/A C:\Windows\explorer.exe N/A
N/A N/A C:\Windows\explorer.exe N/A
N/A N/A C:\Windows\explorer.exe N/A
N/A N/A C:\Windows\explorer.exe N/A
N/A N/A C:\Windows\explorer.exe N/A
N/A N/A C:\Windows\explorer.exe N/A
N/A N/A C:\Windows\explorer.exe N/A
N/A N/A C:\Windows\explorer.exe N/A
N/A N/A C:\Windows\explorer.exe N/A
N/A N/A C:\Windows\explorer.exe N/A
N/A N/A C:\Windows\explorer.exe N/A
N/A N/A C:\Windows\explorer.exe N/A
N/A N/A C:\Windows\explorer.exe N/A
N/A N/A C:\Windows\explorer.exe N/A
N/A N/A C:\Windows\explorer.exe N/A
N/A N/A C:\Windows\explorer.exe N/A
N/A N/A C:\Windows\explorer.exe N/A

Suspicious use of SendNotifyMessage

Description Indicator Process Target
N/A N/A C:\Windows\explorer.exe N/A
N/A N/A C:\Windows\explorer.exe N/A
N/A N/A C:\Windows\explorer.exe N/A
N/A N/A C:\Windows\explorer.exe N/A
N/A N/A C:\Windows\explorer.exe N/A
N/A N/A C:\Windows\explorer.exe N/A
N/A N/A C:\Windows\explorer.exe N/A
N/A N/A C:\Windows\explorer.exe N/A
N/A N/A C:\Windows\explorer.exe N/A
N/A N/A C:\Windows\explorer.exe N/A
N/A N/A C:\Windows\explorer.exe N/A
N/A N/A C:\Windows\explorer.exe N/A
N/A N/A C:\Windows\explorer.exe N/A
N/A N/A C:\Windows\explorer.exe N/A
N/A N/A C:\Windows\explorer.exe N/A
N/A N/A C:\Windows\explorer.exe N/A
N/A N/A C:\Windows\explorer.exe N/A
N/A N/A C:\Windows\explorer.exe N/A
N/A N/A C:\Windows\explorer.exe N/A
N/A N/A C:\Windows\explorer.exe N/A
N/A N/A C:\Windows\explorer.exe N/A
N/A N/A C:\Windows\explorer.exe N/A
N/A N/A C:\Windows\explorer.exe N/A
N/A N/A C:\Windows\explorer.exe N/A
N/A N/A C:\Windows\explorer.exe N/A
N/A N/A C:\Windows\explorer.exe N/A
N/A N/A C:\Windows\explorer.exe N/A
N/A N/A C:\Windows\explorer.exe N/A
N/A N/A C:\Windows\explorer.exe N/A
N/A N/A C:\Windows\explorer.exe N/A
N/A N/A C:\Windows\explorer.exe N/A
N/A N/A C:\Windows\explorer.exe N/A
N/A N/A C:\Windows\explorer.exe N/A
N/A N/A C:\Windows\explorer.exe N/A
N/A N/A C:\Windows\explorer.exe N/A
N/A N/A C:\Windows\explorer.exe N/A
N/A N/A C:\Windows\explorer.exe N/A
N/A N/A C:\Windows\explorer.exe N/A
N/A N/A C:\Windows\explorer.exe N/A
N/A N/A C:\Windows\explorer.exe N/A
N/A N/A C:\Windows\explorer.exe N/A
N/A N/A C:\Windows\explorer.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 2604 wrote to memory of 644 N/A C:\Users\Admin\AppData\Local\Temp\SilverClient.exe C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
PID 2604 wrote to memory of 644 N/A C:\Users\Admin\AppData\Local\Temp\SilverClient.exe C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
PID 2604 wrote to memory of 644 N/A C:\Users\Admin\AppData\Local\Temp\SilverClient.exe C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
PID 2604 wrote to memory of 2856 N/A C:\Users\Admin\AppData\Local\Temp\SilverClient.exe C:\Windows\System32\schtasks.exe
PID 2604 wrote to memory of 2856 N/A C:\Users\Admin\AppData\Local\Temp\SilverClient.exe C:\Windows\System32\schtasks.exe
PID 2604 wrote to memory of 2856 N/A C:\Users\Admin\AppData\Local\Temp\SilverClient.exe C:\Windows\System32\schtasks.exe
PID 2604 wrote to memory of 1100 N/A C:\Users\Admin\AppData\Local\Temp\SilverClient.exe C:\Windows\explorer.exe
PID 2604 wrote to memory of 1100 N/A C:\Users\Admin\AppData\Local\Temp\SilverClient.exe C:\Windows\explorer.exe
PID 2604 wrote to memory of 1100 N/A C:\Users\Admin\AppData\Local\Temp\SilverClient.exe C:\Windows\explorer.exe
PID 1100 wrote to memory of 984 N/A C:\Windows\explorer.exe C:\Windows\system32\ctfmon.exe
PID 1100 wrote to memory of 984 N/A C:\Windows\explorer.exe C:\Windows\system32\ctfmon.exe
PID 1100 wrote to memory of 984 N/A C:\Windows\explorer.exe C:\Windows\system32\ctfmon.exe
PID 2604 wrote to memory of 2640 N/A C:\Users\Admin\AppData\Local\Temp\SilverClient.exe C:\Windows\explorer.exe
PID 2604 wrote to memory of 2640 N/A C:\Users\Admin\AppData\Local\Temp\SilverClient.exe C:\Windows\explorer.exe
PID 2604 wrote to memory of 2640 N/A C:\Users\Admin\AppData\Local\Temp\SilverClient.exe C:\Windows\explorer.exe
PID 2640 wrote to memory of 1724 N/A C:\Windows\explorer.exe C:\Windows\system32\ctfmon.exe
PID 2640 wrote to memory of 1724 N/A C:\Windows\explorer.exe C:\Windows\system32\ctfmon.exe
PID 2640 wrote to memory of 1724 N/A C:\Windows\explorer.exe C:\Windows\system32\ctfmon.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\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

C:\Windows\explorer.exe

"C:\Windows\explorer.exe"

C:\Windows\system32\ctfmon.exe

ctfmon.exe

C:\Windows\system32\AUDIODG.EXE

C:\Windows\system32\AUDIODG.EXE 0x47c

C:\Windows\explorer.exe

explorer.exe

C:\Windows\explorer.exe

"C:\Windows\explorer.exe"

C:\Windows\system32\ctfmon.exe

ctfmon.exe

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 8.8.8.8:53 softwares500.000webhostapp.com udp

Files

memory/2604-0-0x000007FEF5A93000-0x000007FEF5A94000-memory.dmp

memory/2604-1-0x000000013F4D0000-0x000000013F4DE000-memory.dmp

memory/2604-2-0x000007FEF5A90000-0x000007FEF647C000-memory.dmp

memory/644-7-0x000000001B270000-0x000000001B552000-memory.dmp

memory/644-8-0x00000000022A0000-0x00000000022A8000-memory.dmp

C:\Users\Admin\AppData\Local\Temp\Cab95FB.tmp

MD5 49aebf8cbd62d92ac215b2923fb1b9f5
SHA1 1723be06719828dda65ad804298d0431f6aff976
SHA256 b33efcb95235b98b48508e019afa4b7655e80cf071defabd8b2123fc8b29307f
SHA512 bf86116b015fb56709516d686e168e7c9c68365136231cc51d0b6542ae95323a71d2c7acec84aad7dcecc2e410843f6d82a0a6d51b9acfc721a9c84fdd877b5b

memory/2604-25-0x000007FEF5A93000-0x000007FEF5A94000-memory.dmp

memory/2604-26-0x000007FEF5A90000-0x000007FEF647C000-memory.dmp

memory/2604-27-0x000000001AD10000-0x000000001AD20000-memory.dmp

C:\Users\Admin\AppData\Local\Temp\TarD58D.tmp

MD5 4ea6026cf93ec6338144661bf1202cd1
SHA1 a1dec9044f750ad887935a01430bf49322fbdcb7
SHA256 8efbc21559ef8b1bcf526800d8070baad42474ce7198e26fa771dbb41a76b1d8
SHA512 6c7e0980e39aacf4c3689802353f464a08cd17753bd210ee997e5f2a455deb4f287a9ef74d84579dbde49bc96213cd2b8b247723919c412ea980aa6e6bfe218b

memory/2604-46-0x000000001B480000-0x000000001B490000-memory.dmp

memory/2604-66-0x000000001B490000-0x000000001B4A8000-memory.dmp

memory/2604-85-0x000000001B8C0000-0x000000001B8D2000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2025-02-23 15:26

Reported

2025-02-23 15:29

Platform

win10v2004-20250217-en

Max time kernel

93s

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-1-5-21-1170604239-850860757-3112005715-1000\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 150.171.28.10:443 g.bing.com tcp

Files

memory/2364-0-0x00007FF894AA3000-0x00007FF894AA5000-memory.dmp

memory/2364-1-0x00000000007C0000-0x00000000007CE000-memory.dmp

memory/2364-2-0x00007FF894AA0000-0x00007FF895561000-memory.dmp

memory/4924-3-0x00007FF894AA0000-0x00007FF895561000-memory.dmp

C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_4iemgemd.1ly.ps1

MD5 d17fe0a3f47be24a6453e9ef58c94641
SHA1 6ab83620379fc69f80c0242105ddffd7d98d5d9d
SHA256 96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
SHA512 5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

memory/4924-9-0x0000018870D70000-0x0000018870D92000-memory.dmp

memory/4924-10-0x00007FF894AA0000-0x00007FF895561000-memory.dmp

memory/4924-15-0x00007FF894AA0000-0x00007FF895561000-memory.dmp

memory/4924-18-0x00007FF894AA0000-0x00007FF895561000-memory.dmp

memory/2364-19-0x00007FF894AA3000-0x00007FF894AA5000-memory.dmp

memory/2364-20-0x00007FF894AA0000-0x00007FF895561000-memory.dmp