silverrat | a6eb97732429a680d777c44c010b851064d89500764dfb50af2ceab258b4cb18

Analysis

max time kernel
119s
max time network
139s
platform
windows7_x64
resource
win7-20241010-en
resource tags

arch:x64arch:x86image:win7-20241010-enlocale:en-usos:windows7-x64system
submitted
13/03/2025, 18:40

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General

Target

RuntimeBroker.exe
Size

43KB
MD5

fc12a2e6f37c028c1b3e8a4edf24ca99
SHA1

e13e7c83047eed30602f5ee2d29c8360090c4c23
SHA256

a6eb97732429a680d777c44c010b851064d89500764dfb50af2ceab258b4cb18
SHA512

f15f0c4e328dc551b80885aa4929d91d762fb21a94c1b3ccd68b20dd0a673c6ad218a921d30eda684d821c234b22bb59ad87f77aacce357f1d909d8cd3bdf663
SSDEEP

768:hID/0cMxrB4YDcHWxYQ4xJCHrR8kq/5E0Sxhnhxrbgx5/RULQ6T9SNHX9B6SW/T/:hIDMcMxrmQb5rq/5EtlbgxtGsY98X9oJ

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
QnZ2VW1rTFlUa09ESXhCRkdHYURSSlBBdk5SQk5J
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
2888	attrib.exe
1608	attrib.exe

Executes dropped EXE 1 IoCs

pid	Process
2236	$77Runtime Broker.exe

Loads dropped DLL 1 IoCs

pid	Process
2564	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\""	RuntimeBroker.exe

Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

Using powershell.exe command.

execution

PowerShell

T1059.001

pid	Process
1472	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
1900	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
1984	schtasks.exe
1896	schtasks.exe

Suspicious behavior: EnumeratesProcesses 5 IoCs

pid	Process
2780	RuntimeBroker.exe
2780	RuntimeBroker.exe
2780	RuntimeBroker.exe
2236	$77Runtime Broker.exe
1472	powershell.exe

Suspicious use of AdjustPrivilegeToken 6 IoCs

description	pid	Process
Token: SeBackupPrivilege	2644	vssvc.exe
Token: SeRestorePrivilege	2644	vssvc.exe
Token: SeAuditPrivilege	2644	vssvc.exe
Token: SeDebugPrivilege	2780	RuntimeBroker.exe
Token: SeDebugPrivilege	2236	$77Runtime Broker.exe
Token: SeDebugPrivilege	1472	powershell.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2236	$77Runtime Broker.exe

Suspicious use of WriteProcessMemory 30 IoCs

description	pid	Process	procid_target
PID 2780 wrote to memory of 1608	2780	RuntimeBroker.exe	34
PID 2780 wrote to memory of 1608	2780	RuntimeBroker.exe	34
PID 2780 wrote to memory of 1608	2780	RuntimeBroker.exe	34
PID 2780 wrote to memory of 2888	2780	RuntimeBroker.exe	36
PID 2780 wrote to memory of 2888	2780	RuntimeBroker.exe	36
PID 2780 wrote to memory of 2888	2780	RuntimeBroker.exe	36
PID 2780 wrote to memory of 2564	2780	RuntimeBroker.exe	38
PID 2780 wrote to memory of 2564	2780	RuntimeBroker.exe	38
PID 2780 wrote to memory of 2564	2780	RuntimeBroker.exe	38
PID 2564 wrote to memory of 1900	2564	cmd.exe	40
PID 2564 wrote to memory of 1900	2564	cmd.exe	40
PID 2564 wrote to memory of 1900	2564	cmd.exe	40
PID 2564 wrote to memory of 2236	2564	cmd.exe	42
PID 2564 wrote to memory of 2236	2564	cmd.exe	42
PID 2564 wrote to memory of 2236	2564	cmd.exe	42
PID 2236 wrote to memory of 2168	2236	$77Runtime Broker.exe	44
PID 2236 wrote to memory of 2168	2236	$77Runtime Broker.exe	44
PID 2236 wrote to memory of 2168	2236	$77Runtime Broker.exe	44
PID 2236 wrote to memory of 1984	2236	$77Runtime Broker.exe	46
PID 2236 wrote to memory of 1984	2236	$77Runtime Broker.exe	46
PID 2236 wrote to memory of 1984	2236	$77Runtime Broker.exe	46
PID 2236 wrote to memory of 668	2236	$77Runtime Broker.exe	48
PID 2236 wrote to memory of 668	2236	$77Runtime Broker.exe	48
PID 2236 wrote to memory of 668	2236	$77Runtime Broker.exe	48
PID 2236 wrote to memory of 1472	2236	$77Runtime Broker.exe	50
PID 2236 wrote to memory of 1472	2236	$77Runtime Broker.exe	50
PID 2236 wrote to memory of 1472	2236	$77Runtime Broker.exe	50
PID 2236 wrote to memory of 1896	2236	$77Runtime Broker.exe	52
PID 2236 wrote to memory of 1896	2236	$77Runtime Broker.exe	52
PID 2236 wrote to memory of 1896	2236	$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
1608	attrib.exe
2888	attrib.exe

C:\Users\Admin\AppData\Local\Temp\RuntimeBroker.exe
"C:\Users\Admin\AppData\Local\Temp\RuntimeBroker.exe"
1⤵
- Adds Run key to start application
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2780
- 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:1608
- 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:2888
- C:\Windows\system32\cmd.exe
  cmd /c ""C:\Users\Admin\AppData\Local\Temp\tmpC83F.tmp.bat""
  2⤵
  - Loads dropped DLL
  - Suspicious use of WriteProcessMemory
  PID:2564
- - C:\Windows\system32\timeout.exe
    timeout 3
    3⤵
    - Delays execution with timeout.exe
    PID:1900
- - 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:2236
  - - C:\Windows\system32\schtasks.exe
      "schtasks.exe" /query /TN $77Runtime Broker.exe
      4⤵
      PID:2168
  - - 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:1984
  - - C:\Windows\system32\schtasks.exe
      "schtasks.exe" /query /TN $77Runtime Broker.exe
      4⤵
      PID:668
  - - 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:1472
  - - 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:1896

C:\Windows\system32\vssvc.exe
C:\Windows\system32\vssvc.exe
1⤵
- Suspicious use of AdjustPrivilegeToken
PID:2644

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

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\tmpC83F.tmp.bat

Filesize
199B

MD5
7d0c84c0af4defdfba6c8bdb72afa419

SHA1
1e54595cadcadd153b81f2a9a6a0d9700b02f447

SHA256
4c0fcc8fb30e9ccbc2e2bbb390361094d0cf1be6adc24b7a02b78fd73aacfdbf

SHA512
16521dc72d88e1f2ce0015e7ca916e9767262d264274e3dd529bc20cd861e5fe674a0cf13fbca8a5afac9b7bd14fa7cb3726bb33ffff8959d20a92d97fbc27a4

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

Filesize
43KB

MD5
fc12a2e6f37c028c1b3e8a4edf24ca99

SHA1
e13e7c83047eed30602f5ee2d29c8360090c4c23

SHA256
a6eb97732429a680d777c44c010b851064d89500764dfb50af2ceab258b4cb18

SHA512
f15f0c4e328dc551b80885aa4929d91d762fb21a94c1b3ccd68b20dd0a673c6ad218a921d30eda684d821c234b22bb59ad87f77aacce357f1d909d8cd3bdf663

Download Submit
memory/1472-23-0x000000001B670000-0x000000001B952000-memory.dmp

Filesize
2.9MB

Download
memory/1472-24-0x0000000001E00000-0x0000000001E08000-memory.dmp

Filesize
32KB

Download
memory/2780-0-0x000007FEF53F3000-0x000007FEF53F4000-memory.dmp

Filesize
4KB

Download
memory/2780-1-0x000000013FFD0000-0x000000013FFE0000-memory.dmp

Filesize
64KB

Download
memory/2780-2-0x000007FEF53F0000-0x000007FEF5DDC000-memory.dmp

Filesize
9.9MB

Download
memory/2780-3-0x000007FEF53F3000-0x000007FEF53F4000-memory.dmp

Filesize
4KB

Download
memory/2780-4-0x000007FEF53F0000-0x000007FEF5DDC000-memory.dmp

Filesize
9.9MB

Download
memory/2780-14-0x000007FEF53F0000-0x000007FEF5DDC000-memory.dmp

Filesize
9.9MB

Download