silverrat | 4008b0c3754f16bdf1365b0f894e48c82ccf5f8a656592fab4db899e11b73051

General

Target

SilverClient.exe
Size

42KB
MD5

953679a46f8bada4aea3c89e2026176a
SHA1

b78419d85a443d21fdd3bd6673c6c0b407f615da
SHA256

4008b0c3754f16bdf1365b0f894e48c82ccf5f8a656592fab4db899e11b73051
SHA512

4aabe38b1c404c4d61b08b4126bf509dc81cf50131db2c1061452cd795cc6c1f05055b03f8cadf99aa2b76f0f5c36fc3babe0cbb0a9d978a38fb71ca5f7ecd96
SSDEEP

768:GiImvwcOx/MUpJRBc/u+cJn6550BcmSHrlruPXr7yaaxLEt0URoPRULL9SI1PCBn:GiImIcOBBdn655XTkt0U2Gf9XKo39ZU

Score

10^/10

silverrat execution persistence trojan

Malware Config

Extracted

Family

silverrat

Version

1.0.0.0

C2

hope-asia.gl.at.ply.gg:35710

Mutex

SilverMutex_RxkTUhToXD

Attributes

certificate
MIIE4DCCAsigAwIBAgIQAKQYOfZd86J2BfNjhG4CWTANBgkqhkiG9w0BAQ0FADARMQ8wDQYDVQQDDAZTaWx2ZXIwIBcNMjIwODI2MTkwMTA4WhgPOTk5OTEyMzEyMzU5NTlaMBExDzANBgNVBAMMBlNpbHZlcjCCAiIwDQYJKoZIhvcNAQEBBQADggIPADCCAgoCggIBAPbpOWfhZTuOfEaqqImTTe5dNHAAry7/mf00DCoI4lPZfypsc1tYraxSPFeayGu09a3qdhkWKSVIgwnu2n4GLQNOCY9fh/1oyrX4Iir3BIkYeU7pKTWgjhUlAmFAUAaNr0ca23Ku2kN79jrDzRznOgE2DEW4p7OiM4Mb097ma9lzu7MyssHbY4VCteAhj9HZiplqBxaC1vXDmzxqG+gUZ1aLcyG7ssdkOjtWVBgT3gD/gOl7KchRzCFB1egDC/vD9WZCG35U3Ngi+IkTznoXR1R06cq4v0UnGjE37R2vcB21qb0ZYNiZJXZHv5i9+R7xoPeNoLda5PqnfGGbhPvNEdD56mdcOKlzGIuyemLkUo8texdpiBWKbtc3JZf5VsKxjJtHDK3xW6gDGI+PAirzGkFPmwcf8WgsblvzLg8OZpVxVs8rmKWoi6qIrf4CXnyl73J4lgzW+ir7PjANAQXwLNGdNnvdMeLeo/muGQPdeNpr6OczGGnkWA4qniHeL51/Gx0a8A+jP9zKiyu+qHcsP2IotgWDH/KlzJVr7IAum+DV92uV8poTDcUNcHaKvhHA65KmEtsvLbK6lFZcAMC0eWC0VgpW44T1/16rOaaky5mP6rTMc3nSyOl/lU/XgAgGGQPe22bRLWYzd3WVeEpI1WnHYXS+tL9IOe4kJP+pYsWDAgMBAAGjMjAwMB0GA1UdDgQWBBR32TJj2LeUx9L+RcSOvmFV6VJq6TAPBgNVHRMBAf8EBTADAQH/MA0GCSqGSIb3DQEBDQUAA4ICAQA+qucSOi7ov7Q1FmAjMf925KuvKuCNwJiu3Sqo3FDGVAD1fAwAi2FdyuXEO2VIUPZCkalFcBna5rqyrc6tcS4T0IL2TsYLrsuGir7PWP7CAcft1urYS1HpNpHxeH/nixwnQaQs/MuRmdm2TeCj6G21P5BTW55U5y9sMPSYwhbD2N7XLgnSQd5Y+80TR7FUiye/k3D37fI9PRhSQGbfYFRQQTmxj84dPTnY5CVgaY9d8fNiFZkyjaZdf+mibK0xQTf+xLVVj+toDNCkc1F462TdmFhCrHd4PoMo0yLDNv4SC6NLRq4haWDRtORw6gd5GYIoCQ3m3oQvNlNxXhhIjsOyxkxOrkCD0c+57PIc7EmKXieJa/XxnkcIVxO8dvTY/vijuz/VaZYl/lPu9ckuqgJ1wRvvsHl70Trv4Mn4X5uCIqRFFlK/mSOZbLIguGkDN3QIZABvej89vlZMhrVfZOG2oawe23FskHjv7thF/WzOXtWw6RUVC1V+hCwbuxFNUjZmmOTUwdXHnus7I2AuiG6Jz1+y9aYiXBcVTdSljxjHRRmiRaAnY94h58vN8NJ4hKL2GVCo6LxkpuplmcntJN0cKraKTPxSXcCRrqWxX9qoIbfvBcUU4vH1jPJCCLNCuDyD3lgQkpPVvq0EMU1a2HFGgMEQMjpYpb38rcadDhT5ag==
decrypted_key
-|S.S.S|-
key
yy6zDjAUmbB09pKvo5Hhug==
key_x509
TVRpQXhBRVBpd1liZHFlUlNEQ0FEbVd4Z3JKU1JN
reconnect_delay
4
server_signature
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

Signatures

SilverRat
SilverRat is trojan written in C#.
trojan silverrat
Silverrat family
silverrat

Executes dropped EXE 1 IoCs

pid	Process
2916	$77SystemUser.exe.exe

Loads dropped DLL 1 IoCs

pid	Process
2792	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\\SystemUser.exe\\$77SystemUser.exe.exe\""	SilverClient.exe

Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

Using powershell.exe command.

execution

PowerShell

T1059.001

pid	Process
2240	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

evasion

pid	Process
2204	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
1044	schtasks.exe
2384	schtasks.exe

Suspicious behavior: EnumeratesProcesses 5 IoCs

pid	Process
2636	SilverClient.exe
2636	SilverClient.exe
2636	SilverClient.exe
2916	$77SystemUser.exe.exe
2240	powershell.exe

Suspicious use of AdjustPrivilegeToken 6 IoCs

description	pid	Process
Token: SeBackupPrivilege	2160	vssvc.exe
Token: SeRestorePrivilege	2160	vssvc.exe
Token: SeAuditPrivilege	2160	vssvc.exe
Token: SeDebugPrivilege	2636	SilverClient.exe
Token: SeDebugPrivilege	2916	$77SystemUser.exe.exe
Token: SeDebugPrivilege	2240	powershell.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2916	$77SystemUser.exe.exe

Suspicious use of WriteProcessMemory 24 IoCs

description	pid	Process	procid_target
PID 2636 wrote to memory of 2792	2636	SilverClient.exe	34
PID 2636 wrote to memory of 2792	2636	SilverClient.exe	34
PID 2636 wrote to memory of 2792	2636	SilverClient.exe	34
PID 2792 wrote to memory of 2204	2792	cmd.exe	36
PID 2792 wrote to memory of 2204	2792	cmd.exe	36
PID 2792 wrote to memory of 2204	2792	cmd.exe	36
PID 2792 wrote to memory of 2916	2792	cmd.exe	37
PID 2792 wrote to memory of 2916	2792	cmd.exe	37
PID 2792 wrote to memory of 2916	2792	cmd.exe	37
PID 2916 wrote to memory of 576	2916	$77SystemUser.exe.exe	39
PID 2916 wrote to memory of 576	2916	$77SystemUser.exe.exe	39
PID 2916 wrote to memory of 576	2916	$77SystemUser.exe.exe	39
PID 2916 wrote to memory of 1044	2916	$77SystemUser.exe.exe	41
PID 2916 wrote to memory of 1044	2916	$77SystemUser.exe.exe	41
PID 2916 wrote to memory of 1044	2916	$77SystemUser.exe.exe	41
PID 2916 wrote to memory of 324	2916	$77SystemUser.exe.exe	43
PID 2916 wrote to memory of 324	2916	$77SystemUser.exe.exe	43
PID 2916 wrote to memory of 324	2916	$77SystemUser.exe.exe	43
PID 2916 wrote to memory of 2240	2916	$77SystemUser.exe.exe	45
PID 2916 wrote to memory of 2240	2916	$77SystemUser.exe.exe	45
PID 2916 wrote to memory of 2240	2916	$77SystemUser.exe.exe	45
PID 2916 wrote to memory of 2384	2916	$77SystemUser.exe.exe	47
PID 2916 wrote to memory of 2384	2916	$77SystemUser.exe.exe	47
PID 2916 wrote to memory of 2384	2916	$77SystemUser.exe.exe	47

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

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:2636
- C:\Windows\system32\cmd.exe
  cmd /c ""C:\Users\Admin\AppData\Local\Temp\tmpBE40.tmp.bat""
  2⤵
  - Loads dropped DLL
  - Suspicious use of WriteProcessMemory
  PID:2792
- - C:\Windows\system32\timeout.exe
    timeout 3
    3⤵
    - Delays execution with timeout.exe
    PID:2204
- - C:\Users\Admin\SystemUser.exe\$77SystemUser.exe.exe
    "C:\Users\Admin\SystemUser.exe\$77SystemUser.exe.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:2916
  - - C:\Windows\system32\schtasks.exe
      "schtasks.exe" /query /TN $77SystemUser.exe.exe
      4⤵
      PID:576
  - - C:\Windows\system32\schtasks.exe
      "schtasks.exe" /Create /SC ONCE /TN "$77SystemUser.exe.exe" /TR "C:\Users\Admin\SystemUser.exe\$77SystemUser.exe.exe \"\$77SystemUser.exe.exe\" /AsAdmin" /ST 00:01 /IT /F /RL HIGHEST
      4⤵
      Scheduled Task/Job: Scheduled Task
      PID:1044
  - - C:\Windows\system32\schtasks.exe
      "schtasks.exe" /query /TN $77SystemUser.exe.exe
      4⤵
      PID:324
  - - 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:2240
  - - C:\Windows\System32\schtasks.exe
      "C:\Windows\System32\schtasks.exe" /create /sc hourly /mo 1 /tn "SystemUser.exe_Task-HOURLY-01" /tr "%MyFile%" /st 00:00
      4⤵
      Scheduled Task/Job: Scheduled Task
      PID:2384

C:\Windows\system32\vssvc.exe
C:\Windows\system32\vssvc.exe
1⤵
- Suspicious use of AdjustPrivilegeToken
PID:2160

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

PowerShell

1

T1059.001

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

1

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\tmpBE40.tmp.bat

Filesize
160B

MD5
71ab38f63163c14ed83d4a365a08f9eb

SHA1
9d73e8d5ef142a861d57960a67c7e039f4f46097

SHA256
0fb120038747b37e1a3215150dc2f1aeb737f729bd42e803f8bba0cff7901a65

SHA512
a4c0927c3ba51cc3a4ba36d85e8a63f2190781a8d8c6b583ad9399afb9179ac2230d26c2f7a7da1c16aca5205b27f988357ffb75cef241b8fd6ff5efeaa11e31

Download Submit
\Users\Admin\SystemUser.exe\$77SystemUser.exe.exe

Filesize
42KB

MD5
953679a46f8bada4aea3c89e2026176a

SHA1
b78419d85a443d21fdd3bd6673c6c0b407f615da

SHA256
4008b0c3754f16bdf1365b0f894e48c82ccf5f8a656592fab4db899e11b73051

SHA512
4aabe38b1c404c4d61b08b4126bf509dc81cf50131db2c1061452cd795cc6c1f05055b03f8cadf99aa2b76f0f5c36fc3babe0cbb0a9d978a38fb71ca5f7ecd96

Download Submit
memory/2240-25-0x0000000001F00000-0x0000000001F08000-memory.dmp

Filesize
32KB

Download
memory/2240-24-0x000000001B4F0000-0x000000001B7D2000-memory.dmp

Filesize
2.9MB

Download
memory/2636-0-0x000007FEF4EB3000-0x000007FEF4EB4000-memory.dmp

Filesize
4KB

Download
memory/2636-1-0x000000013F7A0000-0x000000013F7B0000-memory.dmp

Filesize
64KB

Download
memory/2636-2-0x000007FEF4EB0000-0x000007FEF589C000-memory.dmp

Filesize
9.9MB

Download
memory/2636-3-0x000007FEF4EB3000-0x000007FEF4EB4000-memory.dmp

Filesize
4KB

Download
memory/2636-4-0x000007FEF4EB0000-0x000007FEF589C000-memory.dmp

Filesize
9.9MB

Download
memory/2636-14-0x000007FEF4EB0000-0x000007FEF589C000-memory.dmp

Filesize
9.9MB

Download
memory/2916-19-0x000000013F1F0000-0x000000013F200000-memory.dmp

Filesize
64KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads