silverrat | c9c505c8607cad0f8b787fe677ac182fc697930d9ef1895178c50e4f8d99f0c0

Resubmissions

08/03/2025, 18:40

250308-xbchcs1sfs 10

08/03/2025, 18:38

250308-w98ssa1ses 10

Analysis

max time kernel
117s
max time network
150s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
08/03/2025, 18:38

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General

Target

rat/SilverClient - Copy (11).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
584	attrib.exe
2772	attrib.exe

Executes dropped EXE 1 IoCs

pid	Process
1864	$77Runtime Broker.exe

Loads dropped DLL 1 IoCs

pid	Process
912	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 (11).exe

Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

Using powershell.exe command.

execution

PowerShell

T1059.001

pid	Process
1684	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
2196	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
2332	schtasks.exe
2556	schtasks.exe

Suspicious behavior: EnumeratesProcesses 5 IoCs

pid	Process
1344	SilverClient - Copy (11).exe
1344	SilverClient - Copy (11).exe
1344	SilverClient - Copy (11).exe
1864	$77Runtime Broker.exe
1684	powershell.exe

Suspicious use of AdjustPrivilegeToken 6 IoCs

description	pid	Process
Token: SeBackupPrivilege	2584	vssvc.exe
Token: SeRestorePrivilege	2584	vssvc.exe
Token: SeAuditPrivilege	2584	vssvc.exe
Token: SeDebugPrivilege	1344	SilverClient - Copy (11).exe
Token: SeDebugPrivilege	1864	$77Runtime Broker.exe
Token: SeDebugPrivilege	1684	powershell.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1864	$77Runtime Broker.exe

Suspicious use of WriteProcessMemory 30 IoCs

description	pid	Process	procid_target
PID 1344 wrote to memory of 584	1344	SilverClient - Copy (11).exe	32
PID 1344 wrote to memory of 584	1344	SilverClient - Copy (11).exe	32
PID 1344 wrote to memory of 584	1344	SilverClient - Copy (11).exe	32
PID 1344 wrote to memory of 2772	1344	SilverClient - Copy (11).exe	34
PID 1344 wrote to memory of 2772	1344	SilverClient - Copy (11).exe	34
PID 1344 wrote to memory of 2772	1344	SilverClient - Copy (11).exe	34
PID 1344 wrote to memory of 912	1344	SilverClient - Copy (11).exe	36
PID 1344 wrote to memory of 912	1344	SilverClient - Copy (11).exe	36
PID 1344 wrote to memory of 912	1344	SilverClient - Copy (11).exe	36
PID 912 wrote to memory of 2196	912	cmd.exe	38
PID 912 wrote to memory of 2196	912	cmd.exe	38
PID 912 wrote to memory of 2196	912	cmd.exe	38
PID 912 wrote to memory of 1864	912	cmd.exe	39
PID 912 wrote to memory of 1864	912	cmd.exe	39
PID 912 wrote to memory of 1864	912	cmd.exe	39
PID 1864 wrote to memory of 1924	1864	$77Runtime Broker.exe	41
PID 1864 wrote to memory of 1924	1864	$77Runtime Broker.exe	41
PID 1864 wrote to memory of 1924	1864	$77Runtime Broker.exe	41
PID 1864 wrote to memory of 2332	1864	$77Runtime Broker.exe	43
PID 1864 wrote to memory of 2332	1864	$77Runtime Broker.exe	43
PID 1864 wrote to memory of 2332	1864	$77Runtime Broker.exe	43
PID 1864 wrote to memory of 1580	1864	$77Runtime Broker.exe	45
PID 1864 wrote to memory of 1580	1864	$77Runtime Broker.exe	45
PID 1864 wrote to memory of 1580	1864	$77Runtime Broker.exe	45
PID 1864 wrote to memory of 1684	1864	$77Runtime Broker.exe	47
PID 1864 wrote to memory of 1684	1864	$77Runtime Broker.exe	47
PID 1864 wrote to memory of 1684	1864	$77Runtime Broker.exe	47
PID 1864 wrote to memory of 2556	1864	$77Runtime Broker.exe	49
PID 1864 wrote to memory of 2556	1864	$77Runtime Broker.exe	49
PID 1864 wrote to memory of 2556	1864	$77Runtime Broker.exe	49

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
2772	attrib.exe
584	attrib.exe

C:\Users\Admin\AppData\Local\Temp\rat\SilverClient - Copy (11).exe
"C:\Users\Admin\AppData\Local\Temp\rat\SilverClient - Copy (11).exe"
1⤵
- Adds Run key to start application
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1344
- 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:584
- 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:2772
- C:\Windows\system32\cmd.exe
  cmd /c ""C:\Users\Admin\AppData\Local\Temp\tmp9EA0.tmp.bat""
  2⤵
  - Loads dropped DLL
  - Suspicious use of WriteProcessMemory
  PID:912
- - C:\Windows\system32\timeout.exe
    timeout 3
    3⤵
    - Delays execution with timeout.exe
    PID:2196
- - 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:1864
  - - C:\Windows\system32\schtasks.exe
      "schtasks.exe" /query /TN $77Runtime Broker.exe
      4⤵
      PID:1924
  - - 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:2332
  - - C:\Windows\system32\schtasks.exe
      "schtasks.exe" /query /TN $77Runtime Broker.exe
      4⤵
      PID:1580
  - - 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:1684
  - - 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:2556

C:\Windows\system32\vssvc.exe
C:\Windows\system32\vssvc.exe
1⤵
- Suspicious use of AdjustPrivilegeToken
PID:2584

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\tmp9EA0.tmp.bat

Filesize
199B

MD5
a503fe2bc14eb7a6d91f9ef8ccff55a8

SHA1
17d9fb282958708dd70f84738e5099db759e7ecc

SHA256
f03946bb2d3a204a25bc040eb0baeb96f2e75f7538b2580d4212d7ed7a968842

SHA512
f53713c1a454a69dfb02517e5a3bf1ad442a516962af4c5c286715af32e692f58c8f303474ef6b47e2df2cfa0aea197b36d8b8c04add23de7b1794fd05046d6f

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/1344-0-0x000007FEF6363000-0x000007FEF6364000-memory.dmp

Filesize
4KB

Download
memory/1344-1-0x000000013FB00000-0x000000013FB10000-memory.dmp

Filesize
64KB

Download
memory/1344-2-0x000007FEF6360000-0x000007FEF6D4C000-memory.dmp

Filesize
9.9MB

Download
memory/1344-3-0x000007FEF6363000-0x000007FEF6364000-memory.dmp

Filesize
4KB

Download
memory/1344-4-0x000007FEF6360000-0x000007FEF6D4C000-memory.dmp

Filesize
9.9MB

Download
memory/1344-14-0x000007FEF6360000-0x000007FEF6D4C000-memory.dmp

Filesize
9.9MB

Download
memory/1684-24-0x000000001B5A0000-0x000000001B882000-memory.dmp

Filesize
2.9MB

Download
memory/1684-25-0x00000000028E0000-0x00000000028E8000-memory.dmp

Filesize
32KB

Download
memory/1864-19-0x000000013FD70000-0x000000013FD80000-memory.dmp

Filesize
64KB

Download