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
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
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
4908	$77SystemUser.exe.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
1900	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
392	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
3340	schtasks.exe
1688	schtasks.exe

Suspicious behavior: EnumeratesProcesses 22 IoCs

pid	Process
2984	SilverClient.exe
2984	SilverClient.exe
2984	SilverClient.exe
2984	SilverClient.exe
2984	SilverClient.exe
2984	SilverClient.exe
2984	SilverClient.exe
2984	SilverClient.exe
2984	SilverClient.exe
2984	SilverClient.exe
2984	SilverClient.exe
2984	SilverClient.exe
2984	SilverClient.exe
2984	SilverClient.exe
2984	SilverClient.exe
2984	SilverClient.exe
2984	SilverClient.exe
2984	SilverClient.exe
2984	SilverClient.exe
4908	$77SystemUser.exe.exe
1900	powershell.exe
1900	powershell.exe

Suspicious use of AdjustPrivilegeToken 6 IoCs

description	pid	Process
Token: SeBackupPrivilege	2288	vssvc.exe
Token: SeRestorePrivilege	2288	vssvc.exe
Token: SeAuditPrivilege	2288	vssvc.exe
Token: SeDebugPrivilege	2984	SilverClient.exe
Token: SeDebugPrivilege	4908	$77SystemUser.exe.exe
Token: SeDebugPrivilege	1900	powershell.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4908	$77SystemUser.exe.exe

Suspicious use of WriteProcessMemory 16 IoCs

description	pid	Process	procid_target
PID 2984 wrote to memory of 4596	2984	SilverClient.exe	82
PID 2984 wrote to memory of 4596	2984	SilverClient.exe	82
PID 4596 wrote to memory of 392	4596	cmd.exe	84
PID 4596 wrote to memory of 392	4596	cmd.exe	84
PID 4596 wrote to memory of 4908	4596	cmd.exe	85
PID 4596 wrote to memory of 4908	4596	cmd.exe	85
PID 4908 wrote to memory of 72	4908	$77SystemUser.exe.exe	87
PID 4908 wrote to memory of 72	4908	$77SystemUser.exe.exe	87
PID 4908 wrote to memory of 3340	4908	$77SystemUser.exe.exe	89
PID 4908 wrote to memory of 3340	4908	$77SystemUser.exe.exe	89
PID 4908 wrote to memory of 4572	4908	$77SystemUser.exe.exe	91
PID 4908 wrote to memory of 4572	4908	$77SystemUser.exe.exe	91
PID 4908 wrote to memory of 1900	4908	$77SystemUser.exe.exe	93
PID 4908 wrote to memory of 1900	4908	$77SystemUser.exe.exe	93
PID 4908 wrote to memory of 1688	4908	$77SystemUser.exe.exe	95
PID 4908 wrote to memory of 1688	4908	$77SystemUser.exe.exe	95

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:2984
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp336F.tmp.bat""
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:4596
- - C:\Windows\system32\timeout.exe
    timeout 3
    3⤵
    - Delays execution with timeout.exe
    PID:392
- - 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:4908
  - - C:\Windows\SYSTEM32\schtasks.exe
      "schtasks.exe" /query /TN $77SystemUser.exe.exe
      4⤵
      PID:72
  - - 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:3340
  - - C:\Windows\SYSTEM32\schtasks.exe
      "schtasks.exe" /query /TN $77SystemUser.exe.exe
      4⤵
      PID:4572
  - - 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:1900
  - - 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:1688

C:\Windows\system32\vssvc.exe
C:\Windows\system32\vssvc.exe
1⤵
- Suspicious use of AdjustPrivilegeToken
PID:2288

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\__PSScriptPolicyTest_vl2xipqt.icr.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmp336F.tmp.bat

Filesize
160B

MD5
ecacfab8559dd00a2bf716c467817ec6

SHA1
8da9d75dba41e43afe07a0ce9c8fb409931d5cc6

SHA256
418bf4e2bcdc26e568107e9e1ad26331f0167ef85204f8ee24b6401e7fb9e2b2

SHA512
3a170196173ca640abc10d0a003b7f8be522f00e9e543de4bc6bcccfd631f1f17b900abba59a853f03ad7eeac33dcdd54c1753db7e153d9a31992dc1fd84b22e

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

Filesize
42KB

MD5
953679a46f8bada4aea3c89e2026176a

SHA1
b78419d85a443d21fdd3bd6673c6c0b407f615da

SHA256
4008b0c3754f16bdf1365b0f894e48c82ccf5f8a656592fab4db899e11b73051

SHA512
4aabe38b1c404c4d61b08b4126bf509dc81cf50131db2c1061452cd795cc6c1f05055b03f8cadf99aa2b76f0f5c36fc3babe0cbb0a9d978a38fb71ca5f7ecd96

Download Submit
memory/1900-19-0x0000027A4F6B0000-0x0000027A4F6D2000-memory.dmp

Filesize
136KB

Download
memory/2984-0-0x00007FFB50323000-0x00007FFB50325000-memory.dmp

Filesize
8KB

Download
memory/2984-1-0x00000000009C0000-0x00000000009D0000-memory.dmp

Filesize
64KB

Download
memory/2984-2-0x00007FFB50320000-0x00007FFB50DE2000-memory.dmp

Filesize
10.8MB

Download
memory/2984-3-0x00007FFB50323000-0x00007FFB50325000-memory.dmp

Filesize
8KB

Download
memory/2984-4-0x00007FFB50320000-0x00007FFB50DE2000-memory.dmp

Filesize
10.8MB

Download
memory/2984-10-0x00007FFB50320000-0x00007FFB50DE2000-memory.dmp

Filesize
10.8MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads