silverrat | 31f5206de0b4956ae322443d90e5413d3b99a5a0e289985d89589e687abfcc01 | Triage

Analysis

max time kernel
99s
max time network
145s
platform
windows10-ltsc 2021_x64
resource
win10ltsc2021-20250217-en
resource tags

arch:x64arch:x86image:win10ltsc2021-20250217-enlocale:en-usos:windows10-ltsc 2021-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
668	attrib.exe
2488	attrib.exe

Checks computer location settings 2 TTPs 2 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

System Information Discovery

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-1639757381-2759246526-4253643256-1000\Control Panel\International\Geo\Nation	SilverClient.exe
Key value queried	\REGISTRY\USER\S-1-5-21-1639757381-2759246526-4253643256-1000\Control Panel\International\Geo\Nation	$77System Runtime.exe

Executes dropped EXE 1 IoCs

pid	Process
5096	$77System Runtime.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
1088	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
884	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
1436	schtasks.exe
2540	schtasks.exe

Suspicious behavior: EnumeratesProcesses 26 IoCs

pid	Process
3168	SilverClient.exe
3168	SilverClient.exe
3168	SilverClient.exe
3168	SilverClient.exe
3168	SilverClient.exe
3168	SilverClient.exe
3168	SilverClient.exe
3168	SilverClient.exe
3168	SilverClient.exe
3168	SilverClient.exe
3168	SilverClient.exe
3168	SilverClient.exe
3168	SilverClient.exe
3168	SilverClient.exe
3168	SilverClient.exe
3168	SilverClient.exe
3168	SilverClient.exe
3168	SilverClient.exe
3168	SilverClient.exe
3168	SilverClient.exe
3168	SilverClient.exe
3168	SilverClient.exe
3168	SilverClient.exe
5096	$77System Runtime.exe
1088	powershell.exe
1088	powershell.exe

Suspicious use of AdjustPrivilegeToken 27 IoCs

description	pid	Process
Token: SeBackupPrivilege	2032	vssvc.exe
Token: SeRestorePrivilege	2032	vssvc.exe
Token: SeAuditPrivilege	2032	vssvc.exe
Token: SeDebugPrivilege	3168	SilverClient.exe
Token: SeDebugPrivilege	5096	$77System Runtime.exe
Token: SeDebugPrivilege	1088	powershell.exe
Token: SeIncreaseQuotaPrivilege	1088	powershell.exe
Token: SeSecurityPrivilege	1088	powershell.exe
Token: SeTakeOwnershipPrivilege	1088	powershell.exe
Token: SeLoadDriverPrivilege	1088	powershell.exe
Token: SeSystemProfilePrivilege	1088	powershell.exe
Token: SeSystemtimePrivilege	1088	powershell.exe
Token: SeProfSingleProcessPrivilege	1088	powershell.exe
Token: SeIncBasePriorityPrivilege	1088	powershell.exe
Token: SeCreatePagefilePrivilege	1088	powershell.exe
Token: SeBackupPrivilege	1088	powershell.exe
Token: SeRestorePrivilege	1088	powershell.exe
Token: SeShutdownPrivilege	1088	powershell.exe
Token: SeDebugPrivilege	1088	powershell.exe
Token: SeSystemEnvironmentPrivilege	1088	powershell.exe
Token: SeRemoteShutdownPrivilege	1088	powershell.exe
Token: SeUndockPrivilege	1088	powershell.exe
Token: SeManageVolumePrivilege	1088	powershell.exe
Token: 33	1088	powershell.exe
Token: 34	1088	powershell.exe
Token: 35	1088	powershell.exe
Token: 36	1088	powershell.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
5096	$77System Runtime.exe

Suspicious use of WriteProcessMemory 20 IoCs

description	pid	Process	procid_target
PID 3168 wrote to memory of 668	3168	SilverClient.exe	88
PID 3168 wrote to memory of 668	3168	SilverClient.exe	88
PID 3168 wrote to memory of 2488	3168	SilverClient.exe	90
PID 3168 wrote to memory of 2488	3168	SilverClient.exe	90
PID 3168 wrote to memory of 1496	3168	SilverClient.exe	98
PID 3168 wrote to memory of 1496	3168	SilverClient.exe	98
PID 1496 wrote to memory of 884	1496	cmd.exe	100
PID 1496 wrote to memory of 884	1496	cmd.exe	100
PID 1496 wrote to memory of 5096	1496	cmd.exe	101
PID 1496 wrote to memory of 5096	1496	cmd.exe	101
PID 5096 wrote to memory of 3840	5096	$77System Runtime.exe	103
PID 5096 wrote to memory of 3840	5096	$77System Runtime.exe	103
PID 5096 wrote to memory of 2540	5096	$77System Runtime.exe	105
PID 5096 wrote to memory of 2540	5096	$77System Runtime.exe	105
PID 5096 wrote to memory of 1672	5096	$77System Runtime.exe	107
PID 5096 wrote to memory of 1672	5096	$77System Runtime.exe	107
PID 5096 wrote to memory of 1088	5096	$77System Runtime.exe	109
PID 5096 wrote to memory of 1088	5096	$77System Runtime.exe	109
PID 5096 wrote to memory of 1436	5096	$77System Runtime.exe	110
PID 5096 wrote to memory of 1436	5096	$77System Runtime.exe	110

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
668	attrib.exe
2488	attrib.exe

C:\Users\Admin\AppData\Local\Temp\SilverClient.exe
"C:\Users\Admin\AppData\Local\Temp\SilverClient.exe"
1⤵
- Checks computer location settings
- Adds Run key to start application
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3168
- 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:668
- 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:2488
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpE2FD.tmp.bat""
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:1496
- - C:\Windows\system32\timeout.exe
    timeout 3
    3⤵
    - Delays execution with timeout.exe
    PID:884
- - 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⤵
    - Checks computer location settings
    - Executes dropped EXE
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:5096
  - - C:\Windows\SYSTEM32\schtasks.exe
      "schtasks.exe" /query /TN $77System Runtime.exe
      4⤵
      PID:3840
  - - 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:2540
  - - C:\Windows\SYSTEM32\schtasks.exe
      "schtasks.exe" /query /TN $77System Runtime.exe
      4⤵
      PID:1672
  - - 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:1088
  - - 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:1436

C:\Windows\system32\vssvc.exe
C:\Windows\system32\vssvc.exe
1⤵
- Suspicious use of AdjustPrivilegeToken
PID:2032

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\__PSScriptPolicyTest_ocac4wqz.3rk.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmpE2FD.tmp.bat

Filesize
198B

MD5
98e6be4269cdce264dfe689d11f6bb3e

SHA1
3765e7d14e3b69fbd8026fe6d52ff9577ae2da33

SHA256
99e96e393ae5f9573cf21a3ac1cb674400943a95102f3cc452fc52045de8fde2

SHA512
38c518c380e398285b30ab32ec14f489644de2fc5e879d645bbde194abd7af5a48201180ef3eead57f34cbf3035543f10c84b1f31683d3888a17d22330441d68

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

Filesize
43KB

MD5
231b78ea676e1fac2dfa84a2faccb6f7

SHA1
eb4782d8598f33632d2444fb9df4d5a9bff8574f

SHA256
31f5206de0b4956ae322443d90e5413d3b99a5a0e289985d89589e687abfcc01

SHA512
f22bc8992796a414717b1ec187b1ee18b5cf15720f07f231c12d04d5485da96c25998a7adb249ef085abfaace7b48089916839101f056dc02968eb15a7d4239f

Download Submit
memory/1088-19-0x0000016EFFF00000-0x0000016EFFF22000-memory.dmp

Filesize
136KB

Download
memory/3168-0-0x00007FF988EB3000-0x00007FF988EB5000-memory.dmp

Filesize
8KB

Download
memory/3168-1-0x0000000000F50000-0x0000000000F60000-memory.dmp

Filesize
64KB

Download
memory/3168-2-0x00007FF988EB0000-0x00007FF989972000-memory.dmp

Filesize
10.8MB

Download
memory/3168-3-0x00007FF988EB3000-0x00007FF988EB5000-memory.dmp

Filesize
8KB

Download
memory/3168-4-0x00007FF988EB0000-0x00007FF989972000-memory.dmp

Filesize
10.8MB

Download
memory/3168-10-0x00007FF988EB0000-0x00007FF989972000-memory.dmp

Filesize
10.8MB

Download