silverrat | 31f5206de0b4956ae322443d90e5413d3b99a5a0e289985d89589e687abfcc01

General

Target

SilverClient.exe
Size

43KB
MD5

231b78ea676e1fac2dfa84a2faccb6f7
SHA1

eb4782d8598f33632d2444fb9df4d5a9bff8574f
SHA256

31f5206de0b4956ae322443d90e5413d3b99a5a0e289985d89589e687abfcc01
SHA512

f22bc8992796a414717b1ec187b1ee18b5cf15720f07f231c12d04d5485da96c25998a7adb249ef085abfaace7b48089916839101f056dc02968eb15a7d4239f
SSDEEP

768:Dbrc0SeW8cf/Ol6IoZmTPHhm7LavCJ8eEPWRULQD9PBVGiz1QB6SJ/lE:Dbrc0SeA4txJm9ZKWGsD9yu1Qou/lE

Score

10^/10

silverrat defense_evasion execution persistence trojan

Malware Config

Extracted

Family

silverrat

Version

1.0.0.0

C2

if-eventually.gl.at.ply.gg:17094

Mutex

4536v43xbhf

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
320	attrib.exe
3548	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-1-5-21-3446877943-4095308722-756223633-1000\Control Panel\International\Geo\Nation	SilverClient.exe
Key value queried	\REGISTRY\USER\S-1-5-21-3446877943-4095308722-756223633-1000\Control Panel\International\Geo\Nation	$77System Runtime.exe

Executes dropped EXE 1 IoCs

pid	Process
3104	$77System Runtime.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\\SysWOW64\\$77System Runtime.exe\""	SilverClient.exe

Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

Using powershell.exe command.

execution

PowerShell

T1059.001

pid	Process
4632	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
2772	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
2028	schtasks.exe
4552	schtasks.exe

Suspicious behavior: EnumeratesProcesses 22 IoCs

pid	Process
2724	SilverClient.exe
2724	SilverClient.exe
2724	SilverClient.exe
2724	SilverClient.exe
2724	SilverClient.exe
2724	SilverClient.exe
2724	SilverClient.exe
2724	SilverClient.exe
2724	SilverClient.exe
2724	SilverClient.exe
2724	SilverClient.exe
2724	SilverClient.exe
2724	SilverClient.exe
2724	SilverClient.exe
2724	SilverClient.exe
2724	SilverClient.exe
2724	SilverClient.exe
2724	SilverClient.exe
2724	SilverClient.exe
3104	$77System Runtime.exe
4632	powershell.exe
4632	powershell.exe

Suspicious use of AdjustPrivilegeToken 6 IoCs

description	pid	Process
Token: SeBackupPrivilege	4196	vssvc.exe
Token: SeRestorePrivilege	4196	vssvc.exe
Token: SeAuditPrivilege	4196	vssvc.exe
Token: SeDebugPrivilege	2724	SilverClient.exe
Token: SeDebugPrivilege	3104	$77System Runtime.exe
Token: SeDebugPrivilege	4632	powershell.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3104	$77System Runtime.exe

Suspicious use of WriteProcessMemory 20 IoCs

description	pid	Process	procid_target
PID 2724 wrote to memory of 320	2724	SilverClient.exe	86
PID 2724 wrote to memory of 320	2724	SilverClient.exe	86
PID 2724 wrote to memory of 3548	2724	SilverClient.exe	88
PID 2724 wrote to memory of 3548	2724	SilverClient.exe	88
PID 2724 wrote to memory of 5916	2724	SilverClient.exe	90
PID 2724 wrote to memory of 5916	2724	SilverClient.exe	90
PID 5916 wrote to memory of 2772	5916	cmd.exe	92
PID 5916 wrote to memory of 2772	5916	cmd.exe	92
PID 5916 wrote to memory of 3104	5916	cmd.exe	93
PID 5916 wrote to memory of 3104	5916	cmd.exe	93
PID 3104 wrote to memory of 1164	3104	$77System Runtime.exe	95
PID 3104 wrote to memory of 1164	3104	$77System Runtime.exe	95
PID 3104 wrote to memory of 2028	3104	$77System Runtime.exe	97
PID 3104 wrote to memory of 2028	3104	$77System Runtime.exe	97
PID 3104 wrote to memory of 1152	3104	$77System Runtime.exe	99
PID 3104 wrote to memory of 1152	3104	$77System Runtime.exe	99
PID 3104 wrote to memory of 4632	3104	$77System Runtime.exe	101
PID 3104 wrote to memory of 4632	3104	$77System Runtime.exe	101
PID 3104 wrote to memory of 4552	3104	$77System Runtime.exe	103
PID 3104 wrote to memory of 4552	3104	$77System Runtime.exe	103

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
320	attrib.exe
3548	attrib.exe

C:\Users\Admin\AppData\Local\Temp\SilverClient.exe
"C:\Users\Admin\AppData\Local\Temp\SilverClient.exe"
1⤵
- Checks computer location settings
- Adds Run key to start application
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2724
- C:\Windows\System32\attrib.exe
  "C:\Windows\System32\attrib.exe" +s +h "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Templates\SysWOW64"
  2⤵
  - Sets file to hidden
  - Views/modifies file attributes
  PID:320
- C:\Windows\System32\attrib.exe
  "C:\Windows\System32\attrib.exe" +s +h "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Templates\SysWOW64\$77System Runtime.exe"
  2⤵
  - Sets file to hidden
  - Views/modifies file attributes
  PID:3548
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpD438.tmp.bat""
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:5916
- - C:\Windows\system32\timeout.exe
    timeout 3
    3⤵
    - Delays execution with timeout.exe
    PID:2772
- - C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Templates\SysWOW64\$77System Runtime.exe
    "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Templates\SysWOW64\$77System Runtime.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:3104
  - - C:\Windows\SYSTEM32\schtasks.exe
      "schtasks.exe" /query /TN $77System Runtime.exe
      4⤵
      PID:1164
  - - C:\Windows\SYSTEM32\schtasks.exe
      "schtasks.exe" /Create /SC ONCE /TN "$77System Runtime.exe" /TR "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Templates\SysWOW64\$77System Runtime.exe \"\$77System Runtime.exe\" /AsAdmin" /ST 00:01 /IT /F /RL HIGHEST
      4⤵
      Scheduled Task/Job: Scheduled Task
      PID:2028
  - - C:\Windows\SYSTEM32\schtasks.exe
      "schtasks.exe" /query /TN $77System Runtime.exe
      4⤵
      PID:1152
  - - 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:4632
  - - C:\Windows\System32\schtasks.exe
      "C:\Windows\System32\schtasks.exe" /create /sc hourly /mo 1 /tn "System Runtime_Task-HOURLY-01" /tr "%MyFile%" /st 00:00
      4⤵
      Scheduled Task/Job: Scheduled Task
      PID:4552

C:\Windows\system32\vssvc.exe
C:\Windows\system32\vssvc.exe
1⤵
- Suspicious use of AdjustPrivilegeToken
PID:4196

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

Hide Artifacts

2

T1564

Hidden Files and Directories

Modify Registry

Credential Access

Discovery

Query Registry

2

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_1rimjh0g.3fq.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmpD438.tmp.bat

Filesize
198B

MD5
5a087df3171374d42e13704643ea8ac5

SHA1
700c32f7787902416eae05bd6599a6ce74354bdb

SHA256
45d8c852e3a4bd4bef6db6df95b50163847d43ca9b19de5cbb29cfffd3e93bbb

SHA512
dbda0a6c03332b0bb4e2a73e96ff6514fb241d4d5b327dcd5ea2c4d39ebd9468d115d49616418ba219db97c227cdafcc0421fa13604acce8f04b83eab8007d11

Download Submit
C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Templates\SysWOW64\$77System Runtime.exe

Filesize
43KB

MD5
231b78ea676e1fac2dfa84a2faccb6f7

SHA1
eb4782d8598f33632d2444fb9df4d5a9bff8574f

SHA256
31f5206de0b4956ae322443d90e5413d3b99a5a0e289985d89589e687abfcc01

SHA512
f22bc8992796a414717b1ec187b1ee18b5cf15720f07f231c12d04d5485da96c25998a7adb249ef085abfaace7b48089916839101f056dc02968eb15a7d4239f

Download Submit
memory/2724-0-0x00007FF845E33000-0x00007FF845E35000-memory.dmp

Filesize
8KB

Download
memory/2724-1-0x0000000000FE0000-0x0000000000FF0000-memory.dmp

Filesize
64KB

Download
memory/2724-2-0x00007FF845E30000-0x00007FF8468F1000-memory.dmp

Filesize
10.8MB

Download
memory/2724-3-0x00007FF845E33000-0x00007FF845E35000-memory.dmp

Filesize
8KB

Download
memory/2724-4-0x00007FF845E30000-0x00007FF8468F1000-memory.dmp

Filesize
10.8MB

Download
memory/2724-10-0x00007FF845E30000-0x00007FF8468F1000-memory.dmp

Filesize
10.8MB

Download
memory/4632-23-0x00000140C9F30000-0x00000140C9F52000-memory.dmp

Filesize
136KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads