silverrat | 31f5206de0b4956ae322443d90e5413d3b99a5a0e289985d89589e687abfcc01 | Triage

Analysis

max time kernel
120s
max time network
138s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
13/03/2025, 18:30

Sharing

Report Analysis Logs

General

Target

SilverClient.exe
Size

43KB
MD5

231b78ea676e1fac2dfa84a2faccb6f7
SHA1

eb4782d8598f33632d2444fb9df4d5a9bff8574f
SHA256

31f5206de0b4956ae322443d90e5413d3b99a5a0e289985d89589e687abfcc01
SHA512

f22bc8992796a414717b1ec187b1ee18b5cf15720f07f231c12d04d5485da96c25998a7adb249ef085abfaace7b48089916839101f056dc02968eb15a7d4239f
SSDEEP

768:Dbrc0SeW8cf/Ol6IoZmTPHhm7LavCJ8eEPWRULQD9PBVGiz1QB6SJ/lE:Dbrc0SeA4txJm9ZKWGsD9yu1Qou/lE

Score

10^/10

silverrat defense_evasion execution persistence trojan

Malware Config

Extracted

Family

silverrat

Version

1.0.0.0

C2

if-eventually.gl.at.ply.gg:17094

Mutex

4536v43xbhf

Attributes

certificate
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
decrypted_key
-|S.S.S|-
key
yy6zDjAUmbB09pKvo5Hhug==
key_x509
b0FGeVZNcFRMWVloVHR6Z0VESU5RdlpZUmxZbUFE
reconnect_delay
4
server_signature
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

Signatures

SilverRat
SilverRat is trojan written in C#.
trojan silverrat
Silverrat family
silverrat

Sets file to hidden 1 TTPs 2 IoCs

Modifies file attributes to stop it showing in Explorer etc.

defense_evasion

Hidden Files and Directories

pid	Process
568	attrib.exe
2032	attrib.exe

Executes dropped EXE 1 IoCs

pid	Process
1836	$77System Runtime.exe

Loads dropped DLL 1 IoCs

pid	Process
1948	cmd.exe

Adds Run key to start application 2 TTPs 1 IoCs

Registry Run Keys / Startup Folder

Modify Registry

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\ = "\"C:\\Users\\Admin\\AppData\\Roaming\\Microsoft\\Windows\\Templates\\SysWOW64\\$77System Runtime.exe\""	SilverClient.exe

Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

Using powershell.exe command.

PowerShell

pid	Process
2508	powershell.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

Delays execution with timeout.exe 1 IoCs

defense_evasion

pid	Process
2624	timeout.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 2 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence execution

Scheduled Task

pid	Process
1820	schtasks.exe
2080	schtasks.exe

Suspicious behavior: EnumeratesProcesses 5 IoCs

pid	Process
3060	SilverClient.exe
3060	SilverClient.exe
3060	SilverClient.exe
1836	$77System Runtime.exe
2508	powershell.exe

Suspicious use of AdjustPrivilegeToken 6 IoCs

description	pid	Process
Token: SeBackupPrivilege	2268	vssvc.exe
Token: SeRestorePrivilege	2268	vssvc.exe
Token: SeAuditPrivilege	2268	vssvc.exe
Token: SeDebugPrivilege	3060	SilverClient.exe
Token: SeDebugPrivilege	1836	$77System Runtime.exe
Token: SeDebugPrivilege	2508	powershell.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1836	$77System Runtime.exe

Suspicious use of WriteProcessMemory 30 IoCs

description	pid	Process	procid_target
PID 3060 wrote to memory of 568	3060	SilverClient.exe	35
PID 3060 wrote to memory of 568	3060	SilverClient.exe	35
PID 3060 wrote to memory of 568	3060	SilverClient.exe	35
PID 3060 wrote to memory of 2032	3060	SilverClient.exe	37
PID 3060 wrote to memory of 2032	3060	SilverClient.exe	37
PID 3060 wrote to memory of 2032	3060	SilverClient.exe	37
PID 3060 wrote to memory of 1948	3060	SilverClient.exe	39
PID 3060 wrote to memory of 1948	3060	SilverClient.exe	39
PID 3060 wrote to memory of 1948	3060	SilverClient.exe	39
PID 1948 wrote to memory of 2624	1948	cmd.exe	41
PID 1948 wrote to memory of 2624	1948	cmd.exe	41
PID 1948 wrote to memory of 2624	1948	cmd.exe	41
PID 1948 wrote to memory of 1836	1948	cmd.exe	42
PID 1948 wrote to memory of 1836	1948	cmd.exe	42
PID 1948 wrote to memory of 1836	1948	cmd.exe	42
PID 1836 wrote to memory of 1860	1836	$77System Runtime.exe	44
PID 1836 wrote to memory of 1860	1836	$77System Runtime.exe	44
PID 1836 wrote to memory of 1860	1836	$77System Runtime.exe	44
PID 1836 wrote to memory of 1820	1836	$77System Runtime.exe	46
PID 1836 wrote to memory of 1820	1836	$77System Runtime.exe	46
PID 1836 wrote to memory of 1820	1836	$77System Runtime.exe	46
PID 1836 wrote to memory of 2188	1836	$77System Runtime.exe	48
PID 1836 wrote to memory of 2188	1836	$77System Runtime.exe	48
PID 1836 wrote to memory of 2188	1836	$77System Runtime.exe	48
PID 1836 wrote to memory of 2508	1836	$77System Runtime.exe	50
PID 1836 wrote to memory of 2508	1836	$77System Runtime.exe	50
PID 1836 wrote to memory of 2508	1836	$77System Runtime.exe	50
PID 1836 wrote to memory of 2080	1836	$77System Runtime.exe	52
PID 1836 wrote to memory of 2080	1836	$77System Runtime.exe	52
PID 1836 wrote to memory of 2080	1836	$77System Runtime.exe	52

Uses Task Scheduler COM API 1 TTPs
The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.
persistence

Query Registry
T1012
Uses Volume Shadow Copy service COM API
The Volume Shadow Copy service is used to manage backups/snapshots.
ransomware

Views/modifies file attributes 1 TTPs 2 IoCs

defense_evasion

Hidden Files and Directories

pid	Process
568	attrib.exe
2032	attrib.exe

C:\Users\Admin\AppData\Local\Temp\SilverClient.exe
"C:\Users\Admin\AppData\Local\Temp\SilverClient.exe"
1⤵
- Adds Run key to start application
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3060
- C:\Windows\System32\attrib.exe
  "C:\Windows\System32\attrib.exe" +s +h "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Templates\SysWOW64"
  2⤵
  - Sets file to hidden
  - Views/modifies file attributes
  PID:568
- C:\Windows\System32\attrib.exe
  "C:\Windows\System32\attrib.exe" +s +h "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Templates\SysWOW64\$77System Runtime.exe"
  2⤵
  - Sets file to hidden
  - Views/modifies file attributes
  PID:2032
- C:\Windows\system32\cmd.exe
  cmd /c ""C:\Users\Admin\AppData\Local\Temp\tmp3073.tmp.bat""
  2⤵
  - Loads dropped DLL
  - Suspicious use of WriteProcessMemory
  PID:1948
- - C:\Windows\system32\timeout.exe
    timeout 3
    3⤵
    - Delays execution with timeout.exe
    PID:2624
- - C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Templates\SysWOW64\$77System Runtime.exe
    "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Templates\SysWOW64\$77System Runtime.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:1836
  - - C:\Windows\system32\schtasks.exe
      "schtasks.exe" /query /TN $77System Runtime.exe
      4⤵
      PID:1860
  - - C:\Windows\system32\schtasks.exe
      "schtasks.exe" /Create /SC ONCE /TN "$77System Runtime.exe" /TR "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Templates\SysWOW64\$77System Runtime.exe \"\$77System Runtime.exe\" /AsAdmin" /ST 00:01 /IT /F /RL HIGHEST
      4⤵
      Scheduled Task/Job: Scheduled Task
      PID:1820
  - - C:\Windows\system32\schtasks.exe
      "schtasks.exe" /query /TN $77System Runtime.exe
      4⤵
      PID:2188
  - - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Set-MpPreference -ExclusionExtension exe,bat,dll,ps1;exit
      4⤵
      Command and Scripting Interpreter: PowerShell
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      PID:2508
  - - C:\Windows\System32\schtasks.exe
      "C:\Windows\System32\schtasks.exe" /create /sc hourly /mo 1 /tn "System Runtime_Task-HOURLY-01" /tr "%MyFile%" /st 00:00
      4⤵
      Scheduled Task/Job: Scheduled Task
      PID:2080

C:\Windows\system32\vssvc.exe
C:\Windows\system32\vssvc.exe
1⤵
- Suspicious use of AdjustPrivilegeToken
PID:2268

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

PowerShell

Scheduled Task/Job

Scheduled Task

Persistence

Boot or Logon Autostart Execution

Registry Run Keys / Startup Folder

Scheduled Task/Job

Scheduled Task

Privilege Escalation

Boot or Logon Autostart Execution

Registry Run Keys / Startup Folder

Scheduled Task/Job

Scheduled Task

Defense Evasion

Hide Artifacts

Hidden Files and Directories

Modify Registry

Credential Access

Discovery

Query Registry

System Information Discovery

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

C:\Users\Admin\AppData\Local\Temp\tmp3073.tmp.bat

Filesize
198B

MD5
2f84111385c262498fccf7f2e5218ee6

SHA1
c973fa49453e0fff907f317e974c759c533814a7

SHA256
876b6f947bbd7bd1eec65736d8c7075557787f1f4fe33dd73aae75f3b6f2fd75

SHA512
70fa5135290b62331f78a19f9b98ae481a32c69c48e65724c1e7584b5885109ad18708b81a9c9b429342435067a2d8b961aadbdf2ffdc910d92744222b017003

Download Submit
\Users\Admin\AppData\Roaming\Microsoft\Windows\Templates\SysWOW64\$77System Runtime.exe

Filesize
43KB

MD5
231b78ea676e1fac2dfa84a2faccb6f7

SHA1
eb4782d8598f33632d2444fb9df4d5a9bff8574f

SHA256
31f5206de0b4956ae322443d90e5413d3b99a5a0e289985d89589e687abfcc01

SHA512
f22bc8992796a414717b1ec187b1ee18b5cf15720f07f231c12d04d5485da96c25998a7adb249ef085abfaace7b48089916839101f056dc02968eb15a7d4239f

Download Submit
memory/1836-19-0x000000013FCC0000-0x000000013FCD0000-memory.dmp

Filesize
64KB

Download
memory/2508-25-0x0000000001EF0000-0x0000000001EF8000-memory.dmp

Filesize
32KB

Download
memory/2508-24-0x000000001B670000-0x000000001B952000-memory.dmp

Filesize
2.9MB

Download
memory/3060-0-0x000007FEF5873000-0x000007FEF5874000-memory.dmp

Filesize
4KB

Download
memory/3060-1-0x000000013F8E0000-0x000000013F8F0000-memory.dmp

Filesize
64KB

Download
memory/3060-2-0x000007FEF5870000-0x000007FEF625C000-memory.dmp

Filesize
9.9MB

Download
memory/3060-3-0x000007FEF5873000-0x000007FEF5874000-memory.dmp

Filesize
4KB

Download
memory/3060-4-0x000007FEF5870000-0x000007FEF625C000-memory.dmp

Filesize
9.9MB

Download
memory/3060-14-0x000007FEF5870000-0x000007FEF625C000-memory.dmp

Filesize
9.9MB

Download