silverrat | 31f5206de0b4956ae322443d90e5413d3b99a5a0e289985d89589e687abfcc01

Analysis

max time kernel
121s
max time network
143s
platform
windows7_x64
resource
win7-20241023-en
resource tags

arch:x64arch:x86image:win7-20241023-enlocale:en-usos:windows7-x64system
submitted
13/03/2025, 18:34

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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

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

T1564.001

pid	Process
2864	attrib.exe
2428	attrib.exe

Executes dropped EXE 1 IoCs

pid	Process
1248	$77System Runtime.exe

Loads dropped DLL 1 IoCs

pid	Process
1744	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\\SysWOW64\\$77System Runtime.exe\""	SilverClient.exe

Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

Using powershell.exe command.

execution

PowerShell

T1059.001

pid	Process
2284	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
1972	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
2900	schtasks.exe
3028	schtasks.exe

Suspicious behavior: EnumeratesProcesses 5 IoCs

pid	Process
3036	SilverClient.exe
3036	SilverClient.exe
3036	SilverClient.exe
1248	$77System Runtime.exe
2284	powershell.exe

Suspicious use of AdjustPrivilegeToken 6 IoCs

description	pid	Process
Token: SeBackupPrivilege	2264	vssvc.exe
Token: SeRestorePrivilege	2264	vssvc.exe
Token: SeAuditPrivilege	2264	vssvc.exe
Token: SeDebugPrivilege	3036	SilverClient.exe
Token: SeDebugPrivilege	1248	$77System Runtime.exe
Token: SeDebugPrivilege	2284	powershell.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1248	$77System Runtime.exe

Suspicious use of WriteProcessMemory 30 IoCs

description	pid	Process	procid_target
PID 3036 wrote to memory of 2428	3036	SilverClient.exe	34
PID 3036 wrote to memory of 2428	3036	SilverClient.exe	34
PID 3036 wrote to memory of 2428	3036	SilverClient.exe	34
PID 3036 wrote to memory of 2864	3036	SilverClient.exe	36
PID 3036 wrote to memory of 2864	3036	SilverClient.exe	36
PID 3036 wrote to memory of 2864	3036	SilverClient.exe	36
PID 3036 wrote to memory of 1744	3036	SilverClient.exe	39
PID 3036 wrote to memory of 1744	3036	SilverClient.exe	39
PID 3036 wrote to memory of 1744	3036	SilverClient.exe	39
PID 1744 wrote to memory of 1972	1744	cmd.exe	41
PID 1744 wrote to memory of 1972	1744	cmd.exe	41
PID 1744 wrote to memory of 1972	1744	cmd.exe	41
PID 1744 wrote to memory of 1248	1744	cmd.exe	42
PID 1744 wrote to memory of 1248	1744	cmd.exe	42
PID 1744 wrote to memory of 1248	1744	cmd.exe	42
PID 1248 wrote to memory of 2908	1248	$77System Runtime.exe	44
PID 1248 wrote to memory of 2908	1248	$77System Runtime.exe	44
PID 1248 wrote to memory of 2908	1248	$77System Runtime.exe	44
PID 1248 wrote to memory of 2900	1248	$77System Runtime.exe	46
PID 1248 wrote to memory of 2900	1248	$77System Runtime.exe	46
PID 1248 wrote to memory of 2900	1248	$77System Runtime.exe	46
PID 1248 wrote to memory of 1700	1248	$77System Runtime.exe	48
PID 1248 wrote to memory of 1700	1248	$77System Runtime.exe	48
PID 1248 wrote to memory of 1700	1248	$77System Runtime.exe	48
PID 1248 wrote to memory of 2284	1248	$77System Runtime.exe	50
PID 1248 wrote to memory of 2284	1248	$77System Runtime.exe	50
PID 1248 wrote to memory of 2284	1248	$77System Runtime.exe	50
PID 1248 wrote to memory of 3028	1248	$77System Runtime.exe	52
PID 1248 wrote to memory of 3028	1248	$77System Runtime.exe	52
PID 1248 wrote to memory of 3028	1248	$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

T1564.001

pid	Process
2428	attrib.exe
2864	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:3036
- 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:2428
- 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:2864
- C:\Windows\system32\cmd.exe
  cmd /c ""C:\Users\Admin\AppData\Local\Temp\tmpF7B.tmp.bat""
  2⤵
  - Loads dropped DLL
  - Suspicious use of WriteProcessMemory
  PID:1744
- - C:\Windows\system32\timeout.exe
    timeout 3
    3⤵
    - Delays execution with timeout.exe
    PID:1972
- - 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:1248
  - - C:\Windows\system32\schtasks.exe
      "schtasks.exe" /query /TN $77System Runtime.exe
      4⤵
      PID:2908
  - - 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:2900
  - - C:\Windows\system32\schtasks.exe
      "schtasks.exe" /query /TN $77System Runtime.exe
      4⤵
      PID:1700
  - - 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:2284
  - - 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:3028

C:\Windows\system32\vssvc.exe
C:\Windows\system32\vssvc.exe
1⤵
- Suspicious use of AdjustPrivilegeToken
PID:2264

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\tmpF7B.tmp.bat

Filesize
197B

MD5
df960988af6326f4ae4e2bf4b706e711

SHA1
b832bbe0a0a432b28a705a9c23787a05bc789e58

SHA256
5c257b3a589632f3aadb260a06cec3e3f5f0f9ecc047b5fd92a9d4ae5a9d6703

SHA512
58f2ab24887eb80a5efb503d715b86147f3e519a045f3d34021cd56cdcd53ca665b547473f546d63392c33c913e73eb6dac1daffeb5ab87e3de1be396c95f873

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/1248-19-0x000000013FA20000-0x000000013FA30000-memory.dmp

Filesize
64KB

Download
memory/2284-24-0x000000001B670000-0x000000001B952000-memory.dmp

Filesize
2.9MB

Download
memory/2284-25-0x0000000001F00000-0x0000000001F08000-memory.dmp

Filesize
32KB

Download
memory/3036-0-0x000007FEF55E3000-0x000007FEF55E4000-memory.dmp

Filesize
4KB

Download
memory/3036-1-0x000000013FE30000-0x000000013FE40000-memory.dmp

Filesize
64KB

Download
memory/3036-2-0x000007FEF55E0000-0x000007FEF5FCC000-memory.dmp

Filesize
9.9MB

Download
memory/3036-3-0x000007FEF55E3000-0x000007FEF55E4000-memory.dmp

Filesize
4KB

Download
memory/3036-4-0x000007FEF55E0000-0x000007FEF5FCC000-memory.dmp

Filesize
9.9MB

Download
memory/3036-14-0x000007FEF55E0000-0x000007FEF5FCC000-memory.dmp

Filesize
9.9MB

Download