silverrat | c9c505c8607cad0f8b787fe677ac182fc697930d9ef1895178c50e4f8d99f0c0

Resubmissions

08/03/2025, 18:40

250308-xbchcs1sfs 10

08/03/2025, 18:38

250308-w98ssa1ses 10

Analysis

max time kernel
27s
max time network
147s
platform
windows7_x64
resource
win7-20240729-en
resource tags

arch:x64arch:x86image:win7-20240729-enlocale:en-usos:windows7-x64system
submitted
08/03/2025, 18:38

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General

Target

rat/SilverClient - Copy (4).exe
Size

43KB
MD5

44a5ff2feda2634ae7d9fadc97ebd0a0
SHA1

9a763aefd806585e11a36203e575ae142f38bc6c
SHA256

5dde6801897a7d76c16e64c0b36a3280fbf5371642a690b85ddd31538c4458d8
SHA512

cebc24998c33d7fe8bcdba5183d60c36b3ccaac247d0ee206a73485236453c109dc269522df01d85f58efd3d7a28358221f2139f11356f95f9b8283475f576ca
SSDEEP

768:GdmcASe38zJ/Ol6IoZmtPHJm7+avCJ8eEPNRULQD9PUGa7AB6Sh/lE:GdmcASeuOtvhmeZKNGsD9pYAoS/lE

Score

10^/10

silverrat defense_evasion execution persistence trojan

Malware Config

Extracted

Family

silverrat

Version

1.0.0.0

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

Mutex

Mutex_DthEiIseBZ

Attributes

certificate
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
decrypted_key
-|S.S.S|-
key
yy6zDjAUmbB09pKvo5Hhug==
key_x509
eGlwZU1BZVJwdkFBdllxYmdRQUJ2eWtsbVVURFhE
reconnect_delay
0
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

T1564.001

pid	Process
1428	attrib.exe
344	attrib.exe

Executes dropped EXE 1 IoCs

pid	Process
2340	$77Runtime Broker.exe

Loads dropped DLL 1 IoCs

pid	Process
2872	cmd.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\ = "\"C:\\Users\\Admin\\AppData\\Roaming\\Microsoft\\Windows\\Templates\\SysTemp64\\$77Runtime Broker.exe\""	SilverClient - Copy (4).exe

Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

Using powershell.exe command.

execution

PowerShell

T1059.001

pid	Process
1400	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
652	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

T1053.005

pid	Process
1256	schtasks.exe
3060	schtasks.exe

Suspicious behavior: EnumeratesProcesses 5 IoCs

pid	Process
2376	SilverClient - Copy (4).exe
2376	SilverClient - Copy (4).exe
2376	SilverClient - Copy (4).exe
2340	$77Runtime Broker.exe
1400	powershell.exe

Suspicious use of AdjustPrivilegeToken 6 IoCs

description	pid	Process
Token: SeBackupPrivilege	2800	vssvc.exe
Token: SeRestorePrivilege	2800	vssvc.exe
Token: SeAuditPrivilege	2800	vssvc.exe
Token: SeDebugPrivilege	2376	SilverClient - Copy (4).exe
Token: SeDebugPrivilege	2340	$77Runtime Broker.exe
Token: SeDebugPrivilege	1400	powershell.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2340	$77Runtime Broker.exe

Suspicious use of WriteProcessMemory 30 IoCs

description	pid	Process	procid_target
PID 2376 wrote to memory of 1428	2376	SilverClient - Copy (4).exe	34
PID 2376 wrote to memory of 1428	2376	SilverClient - Copy (4).exe	34
PID 2376 wrote to memory of 1428	2376	SilverClient - Copy (4).exe	34
PID 2376 wrote to memory of 344	2376	SilverClient - Copy (4).exe	36
PID 2376 wrote to memory of 344	2376	SilverClient - Copy (4).exe	36
PID 2376 wrote to memory of 344	2376	SilverClient - Copy (4).exe	36
PID 2376 wrote to memory of 2872	2376	SilverClient - Copy (4).exe	38
PID 2376 wrote to memory of 2872	2376	SilverClient - Copy (4).exe	38
PID 2376 wrote to memory of 2872	2376	SilverClient - Copy (4).exe	38
PID 2872 wrote to memory of 652	2872	cmd.exe	40
PID 2872 wrote to memory of 652	2872	cmd.exe	40
PID 2872 wrote to memory of 652	2872	cmd.exe	40
PID 2872 wrote to memory of 2340	2872	cmd.exe	41
PID 2872 wrote to memory of 2340	2872	cmd.exe	41
PID 2872 wrote to memory of 2340	2872	cmd.exe	41
PID 2340 wrote to memory of 2396	2340	$77Runtime Broker.exe	43
PID 2340 wrote to memory of 2396	2340	$77Runtime Broker.exe	43
PID 2340 wrote to memory of 2396	2340	$77Runtime Broker.exe	43
PID 2340 wrote to memory of 1256	2340	$77Runtime Broker.exe	45
PID 2340 wrote to memory of 1256	2340	$77Runtime Broker.exe	45
PID 2340 wrote to memory of 1256	2340	$77Runtime Broker.exe	45
PID 2340 wrote to memory of 1940	2340	$77Runtime Broker.exe	47
PID 2340 wrote to memory of 1940	2340	$77Runtime Broker.exe	47
PID 2340 wrote to memory of 1940	2340	$77Runtime Broker.exe	47
PID 2340 wrote to memory of 1400	2340	$77Runtime Broker.exe	49
PID 2340 wrote to memory of 1400	2340	$77Runtime Broker.exe	49
PID 2340 wrote to memory of 1400	2340	$77Runtime Broker.exe	49
PID 2340 wrote to memory of 3060	2340	$77Runtime Broker.exe	51
PID 2340 wrote to memory of 3060	2340	$77Runtime Broker.exe	51
PID 2340 wrote to memory of 3060	2340	$77Runtime Broker.exe	51

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

T1564.001

pid	Process
1428	attrib.exe
344	attrib.exe

C:\Users\Admin\AppData\Local\Temp\rat\SilverClient - Copy (4).exe
"C:\Users\Admin\AppData\Local\Temp\rat\SilverClient - Copy (4).exe"
1⤵
- Adds Run key to start application
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2376
- C:\Windows\System32\attrib.exe
  "C:\Windows\System32\attrib.exe" +s +h "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Templates\SysTemp64"
  2⤵
  - Sets file to hidden
  - Views/modifies file attributes
  PID:1428
- C:\Windows\System32\attrib.exe
  "C:\Windows\System32\attrib.exe" +s +h "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Templates\SysTemp64\$77Runtime Broker.exe"
  2⤵
  - Sets file to hidden
  - Views/modifies file attributes
  PID:344
- C:\Windows\system32\cmd.exe
  cmd /c ""C:\Users\Admin\AppData\Local\Temp\tmp1046.tmp.bat""
  2⤵
  - Loads dropped DLL
  - Suspicious use of WriteProcessMemory
  PID:2872
- - C:\Windows\system32\timeout.exe
    timeout 3
    3⤵
    - Delays execution with timeout.exe
    PID:652
- - C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Templates\SysTemp64\$77Runtime Broker.exe
    "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Templates\SysTemp64\$77Runtime Broker.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:2340
  - - C:\Windows\system32\schtasks.exe
      "schtasks.exe" /query /TN $77Runtime Broker.exe
      4⤵
      PID:2396
  - - C:\Windows\system32\schtasks.exe
      "schtasks.exe" /Create /SC ONCE /TN "$77Runtime Broker.exe" /TR "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Templates\SysTemp64\$77Runtime Broker.exe \"\$77Runtime Broker.exe\" /AsAdmin" /ST 00:01 /IT /F /RL HIGHEST
      4⤵
      Scheduled Task/Job: Scheduled Task
      PID:1256
  - - C:\Windows\system32\schtasks.exe
      "schtasks.exe" /query /TN $77Runtime Broker.exe
      4⤵
      PID:1940
  - - 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:1400
  - - C:\Windows\System32\schtasks.exe
      "C:\Windows\System32\schtasks.exe" /create /sc hourly /mo 1 /tn "Runtime Broker_Task-HOURLY-01" /tr "%MyFile%" /st 00:00
      4⤵
      Scheduled Task/Job: Scheduled Task
      PID:3060

C:\Windows\system32\vssvc.exe
C:\Windows\system32\vssvc.exe
1⤵
- Suspicious use of AdjustPrivilegeToken
PID:2800

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

T1059

PowerShell

T1059.001

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Defense Evasion

Hide Artifacts

T1564

Hidden Files and Directories

T1564.001

Modify Registry

T1112

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\tmp1046.tmp.bat

Filesize
199B

MD5
d52997261b3aa03231c395561db77e83

SHA1
cd3b96a3d2bb369c3652e8a7a657755190cec45e

SHA256
6e0c7d412320c84f1e8b55f8fbfb14875ae9fae2266e97fa1ea1212789f73234

SHA512
69154cf498874483744e178971db95ac21ca551004c32d1aa0a760fcbf3e7d9d8059e6a7b37de2f8073be73c696b4694fdcc9284bcdfb16e2ff29d0b6600932f

Download Submit
\Users\Admin\AppData\Roaming\Microsoft\Windows\Templates\SysTemp64\$77Runtime Broker.exe

Filesize
43KB

MD5
44a5ff2feda2634ae7d9fadc97ebd0a0

SHA1
9a763aefd806585e11a36203e575ae142f38bc6c

SHA256
5dde6801897a7d76c16e64c0b36a3280fbf5371642a690b85ddd31538c4458d8

SHA512
cebc24998c33d7fe8bcdba5183d60c36b3ccaac247d0ee206a73485236453c109dc269522df01d85f58efd3d7a28358221f2139f11356f95f9b8283475f576ca

Download Submit
memory/1400-25-0x0000000001FE0000-0x0000000001FE8000-memory.dmp

Filesize
32KB

Download
memory/1400-24-0x000000001B8E0000-0x000000001BBC2000-memory.dmp

Filesize
2.9MB

Download
memory/2340-19-0x000000013F040000-0x000000013F050000-memory.dmp

Filesize
64KB

Download
memory/2376-0-0x000007FEF5EA3000-0x000007FEF5EA4000-memory.dmp

Filesize
4KB

Download
memory/2376-1-0x000000013F1C0000-0x000000013F1D0000-memory.dmp

Filesize
64KB

Download
memory/2376-2-0x000007FEF5EA0000-0x000007FEF688C000-memory.dmp

Filesize
9.9MB

Download
memory/2376-3-0x000007FEF5EA3000-0x000007FEF5EA4000-memory.dmp

Filesize
4KB

Download
memory/2376-4-0x000007FEF5EA0000-0x000007FEF688C000-memory.dmp

Filesize
9.9MB

Download
memory/2376-14-0x000007FEF5EA0000-0x000007FEF688C000-memory.dmp

Filesize
9.9MB

Download