silverrat | afe42ee135f9bbcc385db5751b4867e99aa4caa862bcaaf312e4355a5323145d

Analysis

max time kernel
120s
max time network
147s
platform
windows7_x64
resource
win7-20250207-en
resource tags

arch:x64arch:x86image:win7-20250207-enlocale:en-usos:windows7-x64system
submitted
13/03/2025, 18:42

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General

Target

System.Runtime.exe
Size

43KB
MD5

8f06957fd43a38298aa9d6f4bc52c7a7
SHA1

01a72c623c0ce786e01fbc3c165bb1c099a2dc1a
SHA256

afe42ee135f9bbcc385db5751b4867e99aa4caa862bcaaf312e4355a5323145d
SHA512

4b0283befc959340041cfb8c03caccfe3f32971434f34f85c80eba9921bd6e26e664287ec7826492f2047309bfc86e472aa8cb740008df6cf7b61ac94a54484e
SSDEEP

768:ExhcfSe88qd/Ol6IoZmhPH5m7vavCJ8eEP+RULQD9PuGsz1QB6Sc/lE:ExhcfSes6tjBm5ZK+GsD9vg1Qo7/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

lAxDBRhAFu

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
776	attrib.exe
1868	attrib.exe

Executes dropped EXE 1 IoCs

pid	Process
1792	$77Runtime Broker.exe

Loads dropped DLL 1 IoCs

pid	Process
2552	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\\WinTask\\$77Runtime Broker.exe\""	System.Runtime.exe

Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

Using powershell.exe command.

execution

PowerShell

T1059.001

pid	Process
2596	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
1564	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
1672	schtasks.exe
1104	schtasks.exe

Suspicious behavior: EnumeratesProcesses 5 IoCs

pid	Process
2768	System.Runtime.exe
2768	System.Runtime.exe
2768	System.Runtime.exe
1792	$77Runtime Broker.exe
2596	powershell.exe

Suspicious use of AdjustPrivilegeToken 6 IoCs

description	pid	Process
Token: SeBackupPrivilege	2432	vssvc.exe
Token: SeRestorePrivilege	2432	vssvc.exe
Token: SeAuditPrivilege	2432	vssvc.exe
Token: SeDebugPrivilege	2768	System.Runtime.exe
Token: SeDebugPrivilege	1792	$77Runtime Broker.exe
Token: SeDebugPrivilege	2596	powershell.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1792	$77Runtime Broker.exe

Suspicious use of WriteProcessMemory 30 IoCs

description	pid	Process	procid_target
PID 2768 wrote to memory of 1868	2768	System.Runtime.exe	34
PID 2768 wrote to memory of 1868	2768	System.Runtime.exe	34
PID 2768 wrote to memory of 1868	2768	System.Runtime.exe	34
PID 2768 wrote to memory of 776	2768	System.Runtime.exe	36
PID 2768 wrote to memory of 776	2768	System.Runtime.exe	36
PID 2768 wrote to memory of 776	2768	System.Runtime.exe	36
PID 2768 wrote to memory of 2552	2768	System.Runtime.exe	39
PID 2768 wrote to memory of 2552	2768	System.Runtime.exe	39
PID 2768 wrote to memory of 2552	2768	System.Runtime.exe	39
PID 2552 wrote to memory of 1564	2552	cmd.exe	41
PID 2552 wrote to memory of 1564	2552	cmd.exe	41
PID 2552 wrote to memory of 1564	2552	cmd.exe	41
PID 2552 wrote to memory of 1792	2552	cmd.exe	42
PID 2552 wrote to memory of 1792	2552	cmd.exe	42
PID 2552 wrote to memory of 1792	2552	cmd.exe	42
PID 1792 wrote to memory of 108	1792	$77Runtime Broker.exe	44
PID 1792 wrote to memory of 108	1792	$77Runtime Broker.exe	44
PID 1792 wrote to memory of 108	1792	$77Runtime Broker.exe	44
PID 1792 wrote to memory of 1672	1792	$77Runtime Broker.exe	46
PID 1792 wrote to memory of 1672	1792	$77Runtime Broker.exe	46
PID 1792 wrote to memory of 1672	1792	$77Runtime Broker.exe	46
PID 1792 wrote to memory of 2664	1792	$77Runtime Broker.exe	48
PID 1792 wrote to memory of 2664	1792	$77Runtime Broker.exe	48
PID 1792 wrote to memory of 2664	1792	$77Runtime Broker.exe	48
PID 1792 wrote to memory of 2596	1792	$77Runtime Broker.exe	50
PID 1792 wrote to memory of 2596	1792	$77Runtime Broker.exe	50
PID 1792 wrote to memory of 2596	1792	$77Runtime Broker.exe	50
PID 1792 wrote to memory of 1104	1792	$77Runtime Broker.exe	52
PID 1792 wrote to memory of 1104	1792	$77Runtime Broker.exe	52
PID 1792 wrote to memory of 1104	1792	$77Runtime Broker.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
1868	attrib.exe
776	attrib.exe

C:\Users\Admin\AppData\Local\Temp\System.Runtime.exe
"C:\Users\Admin\AppData\Local\Temp\System.Runtime.exe"
1⤵
- Adds Run key to start application
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2768
- C:\Windows\System32\attrib.exe
  "C:\Windows\System32\attrib.exe" +s +h "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Templates\WinTask"
  2⤵
  - Sets file to hidden
  - Views/modifies file attributes
  PID:1868
- C:\Windows\System32\attrib.exe
  "C:\Windows\System32\attrib.exe" +s +h "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Templates\WinTask\$77Runtime Broker.exe"
  2⤵
  - Sets file to hidden
  - Views/modifies file attributes
  PID:776
- C:\Windows\system32\cmd.exe
  cmd /c ""C:\Users\Admin\AppData\Local\Temp\tmpF49C.tmp.bat""
  2⤵
  - Loads dropped DLL
  - Suspicious use of WriteProcessMemory
  PID:2552
- - C:\Windows\system32\timeout.exe
    timeout 3
    3⤵
    - Delays execution with timeout.exe
    PID:1564
- - C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Templates\WinTask\$77Runtime Broker.exe
    "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Templates\WinTask\$77Runtime Broker.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:1792
  - - C:\Windows\system32\schtasks.exe
      "schtasks.exe" /query /TN $77Runtime Broker.exe
      4⤵
      PID:108
  - - C:\Windows\system32\schtasks.exe
      "schtasks.exe" /Create /SC ONCE /TN "$77Runtime Broker.exe" /TR "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Templates\WinTask\$77Runtime Broker.exe \"\$77Runtime Broker.exe\" /AsAdmin" /ST 00:01 /IT /F /RL HIGHEST
      4⤵
      Scheduled Task/Job: Scheduled Task
      PID:1672
  - - C:\Windows\system32\schtasks.exe
      "schtasks.exe" /query /TN $77Runtime Broker.exe
      4⤵
      PID:2664
  - - 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:2596
  - - 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:1104

C:\Windows\system32\vssvc.exe
C:\Windows\system32\vssvc.exe
1⤵
- Suspicious use of AdjustPrivilegeToken
PID:2432

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\tmpF49C.tmp.bat

Filesize
197B

MD5
0613103b918d70ccd43b63b0eab9193c

SHA1
8e30203ac84278692394dbbdf8be91f48432a3dd

SHA256
b6ea320bccafaea1fb3de7ff78df3719f12e018678e28fec97118baa8c933d61

SHA512
ec7a42d6f8d9e378c158356da50077a720d1c698df21980345eaed0b975ed5183c1e6634d10838501b56fb347c8ac40f1df352e0e5d1cd3ab10452feed943457

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

Filesize
43KB

MD5
8f06957fd43a38298aa9d6f4bc52c7a7

SHA1
01a72c623c0ce786e01fbc3c165bb1c099a2dc1a

SHA256
afe42ee135f9bbcc385db5751b4867e99aa4caa862bcaaf312e4355a5323145d

SHA512
4b0283befc959340041cfb8c03caccfe3f32971434f34f85c80eba9921bd6e26e664287ec7826492f2047309bfc86e472aa8cb740008df6cf7b61ac94a54484e

Download Submit
memory/1792-19-0x000000013F2D0000-0x000000013F2E0000-memory.dmp

Filesize
64KB

Download
memory/2596-24-0x000000001B700000-0x000000001B9E2000-memory.dmp

Filesize
2.9MB

Download
memory/2596-25-0x0000000002330000-0x0000000002338000-memory.dmp

Filesize
32KB

Download
memory/2768-0-0x000007FEF57F3000-0x000007FEF57F4000-memory.dmp

Filesize
4KB

Download
memory/2768-1-0x000000013F230000-0x000000013F240000-memory.dmp

Filesize
64KB

Download
memory/2768-2-0x000007FEF57F0000-0x000007FEF61DC000-memory.dmp

Filesize
9.9MB

Download
memory/2768-3-0x000007FEF57F3000-0x000007FEF57F4000-memory.dmp

Filesize
4KB

Download
memory/2768-4-0x000007FEF57F0000-0x000007FEF61DC000-memory.dmp

Filesize
9.9MB

Download
memory/2768-14-0x000007FEF57F0000-0x000007FEF61DC000-memory.dmp

Filesize
9.9MB

Download