silverrat | c9c505c8607cad0f8b787fe677ac182fc697930d9ef1895178c50e4f8d99f0c0

Resubmissions

08/03/2025, 18:40

250308-xbchcs1sfs 10

08/03/2025, 18:38

250308-w98ssa1ses 10

Analysis

max time kernel
93s
max time network
147s
platform
windows10-2004_x64
resource
win10v2004-20250217-en
resource tags

arch:x64arch:x86image:win10v2004-20250217-enlocale:en-usos:windows10-2004-x64system
submitted
08/03/2025, 18:38

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General

Target

rat/SilverClient - Copy (16).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
4392	attrib.exe
3096	attrib.exe

Checks computer location settings 2 TTPs 2 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-1161330783-2912525651-1278508834-1000\Control Panel\International\Geo\Nation	SilverClient - Copy (16).exe
Key value queried	\REGISTRY\USER\S-1-5-21-1161330783-2912525651-1278508834-1000\Control Panel\International\Geo\Nation	$77Runtime Broker.exe

Executes dropped EXE 1 IoCs

pid	Process
2288	$77Runtime Broker.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 (16).exe

Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

Using powershell.exe command.

execution

PowerShell

T1059.001

pid	Process
3176	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
5008	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
3432	schtasks.exe
2796	schtasks.exe

Suspicious behavior: EnumeratesProcesses 26 IoCs

pid	Process
2236	SilverClient - Copy (16).exe
2236	SilverClient - Copy (16).exe
2236	SilverClient - Copy (16).exe
2236	SilverClient - Copy (16).exe
2236	SilverClient - Copy (16).exe
2236	SilverClient - Copy (16).exe
2236	SilverClient - Copy (16).exe
2236	SilverClient - Copy (16).exe
2236	SilverClient - Copy (16).exe
2236	SilverClient - Copy (16).exe
2236	SilverClient - Copy (16).exe
2236	SilverClient - Copy (16).exe
2236	SilverClient - Copy (16).exe
2236	SilverClient - Copy (16).exe
2236	SilverClient - Copy (16).exe
2236	SilverClient - Copy (16).exe
2236	SilverClient - Copy (16).exe
2236	SilverClient - Copy (16).exe
2236	SilverClient - Copy (16).exe
2236	SilverClient - Copy (16).exe
2236	SilverClient - Copy (16).exe
2236	SilverClient - Copy (16).exe
2236	SilverClient - Copy (16).exe
2288	$77Runtime Broker.exe
3176	powershell.exe
3176	powershell.exe

Suspicious use of AdjustPrivilegeToken 6 IoCs

description	pid	Process
Token: SeBackupPrivilege	1580	vssvc.exe
Token: SeRestorePrivilege	1580	vssvc.exe
Token: SeAuditPrivilege	1580	vssvc.exe
Token: SeDebugPrivilege	2236	SilverClient - Copy (16).exe
Token: SeDebugPrivilege	2288	$77Runtime Broker.exe
Token: SeDebugPrivilege	3176	powershell.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2288	$77Runtime Broker.exe

Suspicious use of WriteProcessMemory 20 IoCs

description	pid	Process	procid_target
PID 2236 wrote to memory of 4392	2236	SilverClient - Copy (16).exe	91
PID 2236 wrote to memory of 4392	2236	SilverClient - Copy (16).exe	91
PID 2236 wrote to memory of 3096	2236	SilverClient - Copy (16).exe	93
PID 2236 wrote to memory of 3096	2236	SilverClient - Copy (16).exe	93
PID 2236 wrote to memory of 1236	2236	SilverClient - Copy (16).exe	101
PID 2236 wrote to memory of 1236	2236	SilverClient - Copy (16).exe	101
PID 1236 wrote to memory of 5008	1236	cmd.exe	103
PID 1236 wrote to memory of 5008	1236	cmd.exe	103
PID 1236 wrote to memory of 2288	1236	cmd.exe	104
PID 1236 wrote to memory of 2288	1236	cmd.exe	104
PID 2288 wrote to memory of 4480	2288	$77Runtime Broker.exe	106
PID 2288 wrote to memory of 4480	2288	$77Runtime Broker.exe	106
PID 2288 wrote to memory of 3432	2288	$77Runtime Broker.exe	108
PID 2288 wrote to memory of 3432	2288	$77Runtime Broker.exe	108
PID 2288 wrote to memory of 2516	2288	$77Runtime Broker.exe	110
PID 2288 wrote to memory of 2516	2288	$77Runtime Broker.exe	110
PID 2288 wrote to memory of 3176	2288	$77Runtime Broker.exe	112
PID 2288 wrote to memory of 3176	2288	$77Runtime Broker.exe	112
PID 2288 wrote to memory of 2796	2288	$77Runtime Broker.exe	113
PID 2288 wrote to memory of 2796	2288	$77Runtime Broker.exe	113

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
4392	attrib.exe
3096	attrib.exe

C:\Users\Admin\AppData\Local\Temp\rat\SilverClient - Copy (16).exe
"C:\Users\Admin\AppData\Local\Temp\rat\SilverClient - Copy (16).exe"
1⤵
- Checks computer location settings
- Adds Run key to start application
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2236
- 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:4392
- 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:3096
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpE91.tmp.bat""
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:1236
- - C:\Windows\system32\timeout.exe
    timeout 3
    3⤵
    - Delays execution with timeout.exe
    PID:5008
- - 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⤵
    - Checks computer location settings
    - Executes dropped EXE
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:2288
  - - C:\Windows\SYSTEM32\schtasks.exe
      "schtasks.exe" /query /TN $77Runtime Broker.exe
      4⤵
      PID:4480
  - - 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:3432
  - - C:\Windows\SYSTEM32\schtasks.exe
      "schtasks.exe" /query /TN $77Runtime Broker.exe
      4⤵
      PID:2516
  - - 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:3176
  - - 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:2796

C:\Windows\system32\vssvc.exe
C:\Windows\system32\vssvc.exe
1⤵
- Suspicious use of AdjustPrivilegeToken
PID:1580

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\__PSScriptPolicyTest_mntgu45m.evo.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmpE91.tmp.bat

Filesize
198B

MD5
b7332b54fe080be45ddb62fbd8be7822

SHA1
4cd03421134e279e7751a3ced88b5404b37cf3d6

SHA256
0828341e59b2cbbd2f452504f0ea8236ff951bf842d1e9c0f4ac0b2d4c754e10

SHA512
4776c08f44848abcc8cce1d45d1f16fe1b456f246f48d5ac4d366ccf6fd72a98c95f36fcb88a6045468b503e192f6ba3b746afc11af046fc82fbb0eef9645251

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

Filesize
43KB

MD5
44a5ff2feda2634ae7d9fadc97ebd0a0

SHA1
9a763aefd806585e11a36203e575ae142f38bc6c

SHA256
5dde6801897a7d76c16e64c0b36a3280fbf5371642a690b85ddd31538c4458d8

SHA512
cebc24998c33d7fe8bcdba5183d60c36b3ccaac247d0ee206a73485236453c109dc269522df01d85f58efd3d7a28358221f2139f11356f95f9b8283475f576ca

Download Submit
memory/2236-0-0x00007FFB62B93000-0x00007FFB62B95000-memory.dmp

Filesize
8KB

Download
memory/2236-1-0x0000000000AB0000-0x0000000000AC0000-memory.dmp

Filesize
64KB

Download
memory/2236-2-0x00007FFB62B90000-0x00007FFB63651000-memory.dmp

Filesize
10.8MB

Download
memory/2236-3-0x00007FFB62B93000-0x00007FFB62B95000-memory.dmp

Filesize
8KB

Download
memory/2236-4-0x00007FFB62B90000-0x00007FFB63651000-memory.dmp

Filesize
10.8MB

Download
memory/2236-10-0x00007FFB62B90000-0x00007FFB63651000-memory.dmp

Filesize
10.8MB

Download
memory/3176-14-0x000001E9BB250000-0x000001E9BB272000-memory.dmp

Filesize
136KB

Download