silverrat | 31f5206de0b4956ae322443d90e5413d3b99a5a0e289985d89589e687abfcc01

Analysis

max time kernel
122s
max time network
140s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
13/03/2025, 18:32

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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
2324	attrib.exe
2328	attrib.exe

Executes dropped EXE 1 IoCs

pid	Process
1700	$77System Runtime.exe

Loads dropped DLL 1 IoCs

pid	Process
2028	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
2540	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
2120	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
2708	schtasks.exe
2032	schtasks.exe

Suspicious behavior: EnumeratesProcesses 5 IoCs

pid	Process
1924	SilverClient.exe
1924	SilverClient.exe
1924	SilverClient.exe
1700	$77System Runtime.exe
2540	powershell.exe

Suspicious use of AdjustPrivilegeToken 6 IoCs

description	pid	Process
Token: SeBackupPrivilege	2752	vssvc.exe
Token: SeRestorePrivilege	2752	vssvc.exe
Token: SeAuditPrivilege	2752	vssvc.exe
Token: SeDebugPrivilege	1924	SilverClient.exe
Token: SeDebugPrivilege	1700	$77System Runtime.exe
Token: SeDebugPrivilege	2540	powershell.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1700	$77System Runtime.exe

Suspicious use of WriteProcessMemory 30 IoCs

description	pid	Process	procid_target
PID 1924 wrote to memory of 2324	1924	SilverClient.exe	34
PID 1924 wrote to memory of 2324	1924	SilverClient.exe	34
PID 1924 wrote to memory of 2324	1924	SilverClient.exe	34
PID 1924 wrote to memory of 2328	1924	SilverClient.exe	36
PID 1924 wrote to memory of 2328	1924	SilverClient.exe	36
PID 1924 wrote to memory of 2328	1924	SilverClient.exe	36
PID 1924 wrote to memory of 2028	1924	SilverClient.exe	39
PID 1924 wrote to memory of 2028	1924	SilverClient.exe	39
PID 1924 wrote to memory of 2028	1924	SilverClient.exe	39
PID 2028 wrote to memory of 2120	2028	cmd.exe	41
PID 2028 wrote to memory of 2120	2028	cmd.exe	41
PID 2028 wrote to memory of 2120	2028	cmd.exe	41
PID 2028 wrote to memory of 1700	2028	cmd.exe	42
PID 2028 wrote to memory of 1700	2028	cmd.exe	42
PID 2028 wrote to memory of 1700	2028	cmd.exe	42
PID 1700 wrote to memory of 1628	1700	$77System Runtime.exe	44
PID 1700 wrote to memory of 1628	1700	$77System Runtime.exe	44
PID 1700 wrote to memory of 1628	1700	$77System Runtime.exe	44
PID 1700 wrote to memory of 2708	1700	$77System Runtime.exe	46
PID 1700 wrote to memory of 2708	1700	$77System Runtime.exe	46
PID 1700 wrote to memory of 2708	1700	$77System Runtime.exe	46
PID 1700 wrote to memory of 1856	1700	$77System Runtime.exe	48
PID 1700 wrote to memory of 1856	1700	$77System Runtime.exe	48
PID 1700 wrote to memory of 1856	1700	$77System Runtime.exe	48
PID 1700 wrote to memory of 2540	1700	$77System Runtime.exe	50
PID 1700 wrote to memory of 2540	1700	$77System Runtime.exe	50
PID 1700 wrote to memory of 2540	1700	$77System Runtime.exe	50
PID 1700 wrote to memory of 2032	1700	$77System Runtime.exe	52
PID 1700 wrote to memory of 2032	1700	$77System Runtime.exe	52
PID 1700 wrote to memory of 2032	1700	$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
2328	attrib.exe
2324	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:1924
- 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:2324
- 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:2328
- C:\Windows\system32\cmd.exe
  cmd /c ""C:\Users\Admin\AppData\Local\Temp\tmpF4BB.tmp.bat""
  2⤵
  - Loads dropped DLL
  - Suspicious use of WriteProcessMemory
  PID:2028
- - C:\Windows\system32\timeout.exe
    timeout 3
    3⤵
    - Delays execution with timeout.exe
    PID:2120
- - 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:1700
  - - C:\Windows\system32\schtasks.exe
      "schtasks.exe" /query /TN $77System Runtime.exe
      4⤵
      PID:1628
  - - 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:2708
  - - C:\Windows\system32\schtasks.exe
      "schtasks.exe" /query /TN $77System Runtime.exe
      4⤵
      PID:1856
  - - 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:2540
  - - 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:2032

C:\Windows\system32\vssvc.exe
C:\Windows\system32\vssvc.exe
1⤵
- Suspicious use of AdjustPrivilegeToken
PID:2752

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\LocalLow\Microsoft\CryptnetUrlCache\Content\94308059B57B3142E455B38A6EB92015

Filesize
71KB

MD5
83142242e97b8953c386f988aa694e4a

SHA1
833ed12fc15b356136dcdd27c61a50f59c5c7d50

SHA256
d72761e1a334a754ce8250e3af7ea4bf25301040929fd88cf9e50b4a9197d755

SHA512
bb6da177bd16d163f377d9b4c63f6d535804137887684c113cc2f643ceab4f34338c06b5a29213c23d375e95d22ef417eac928822dfb3688ce9e2de9d5242d10

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

Filesize
183KB

MD5
109cab5505f5e065b63d01361467a83b

SHA1
4ed78955b9272a9ed689b51bf2bf4a86a25e53fc

SHA256
ea6b7f51e85835c09259d9475a7d246c3e764ad67c449673f9dc97172c351673

SHA512
753a6da5d6889dd52f40208e37f2b8c185805ef81148682b269fff5aa84a46d710fe0ebfe05bce625da2e801e1c26745998a41266fa36bf47bc088a224d730cc

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmpF4BB.tmp.bat

Filesize
198B

MD5
af286aa776d77e8a7725e155ce3e3a1e

SHA1
23f40f12bbf76678d3cd47ba4794e2f809c0acf4

SHA256
e8bab69b54cb3e5f4baac2504c1b3bc4d362863ca331d7052eb8817645320ad4

SHA512
2c2d2a9083caebaebc90879376ff2105d0191b87889aada74907474c543603ac7920ff12c254a29f17bef07881880f027a00826518834024f0eef180b4cfde6a

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/1700-19-0x000000013FAD0000-0x000000013FAE0000-memory.dmp

Filesize
64KB

Download
memory/1924-14-0x000007FEF5830000-0x000007FEF621C000-memory.dmp

Filesize
9.9MB

Download
memory/1924-0-0x000007FEF5833000-0x000007FEF5834000-memory.dmp

Filesize
4KB

Download
memory/1924-4-0x000007FEF5830000-0x000007FEF621C000-memory.dmp

Filesize
9.9MB

Download
memory/1924-3-0x000007FEF5833000-0x000007FEF5834000-memory.dmp

Filesize
4KB

Download
memory/1924-2-0x000007FEF5830000-0x000007FEF621C000-memory.dmp

Filesize
9.9MB

Download
memory/1924-1-0x000000013FF70000-0x000000013FF80000-memory.dmp

Filesize
64KB

Download
memory/2540-24-0x000000001B7A0000-0x000000001BA82000-memory.dmp

Filesize
2.9MB

Download
memory/2540-25-0x0000000001E80000-0x0000000001E88000-memory.dmp

Filesize
32KB

Download