silverrat | afe42ee135f9bbcc385db5751b4867e99aa4caa862bcaaf312e4355a5323145d

General

Target

System.Runtime.exe
Size

43KB
MD5

8f06957fd43a38298aa9d6f4bc52c7a7
SHA1

01a72c623c0ce786e01fbc3c165bb1c099a2dc1a
SHA256

afe42ee135f9bbcc385db5751b4867e99aa4caa862bcaaf312e4355a5323145d
SHA512

4b0283befc959340041cfb8c03caccfe3f32971434f34f85c80eba9921bd6e26e664287ec7826492f2047309bfc86e472aa8cb740008df6cf7b61ac94a54484e
SSDEEP

768:ExhcfSe88qd/Ol6IoZmhPH5m7vavCJ8eEP+RULQD9PuGsz1QB6Sc/lE:ExhcfSes6tjBm5ZK+GsD9vg1Qo7/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

lAxDBRhAFu

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
3636	attrib.exe
5396	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-1-5-21-1279544337-3716153908-718418795-1000\Control Panel\International\Geo\Nation	System.Runtime.exe
Key value queried	\REGISTRY\USER\S-1-5-21-1279544337-3716153908-718418795-1000\Control Panel\International\Geo\Nation	$77Runtime Broker.exe

Executes dropped EXE 1 IoCs

pid	Process
5640	$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\\WinTask\\$77Runtime Broker.exe\""	System.Runtime.exe

Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

Using powershell.exe command.

execution

PowerShell

T1059.001

pid	Process
4696	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
3228	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
2268	schtasks.exe
4680	schtasks.exe

Suspicious behavior: EnumeratesProcesses 20 IoCs

pid	Process
5848	System.Runtime.exe
5848	System.Runtime.exe
5848	System.Runtime.exe
5848	System.Runtime.exe
5848	System.Runtime.exe
5848	System.Runtime.exe
5848	System.Runtime.exe
5848	System.Runtime.exe
5848	System.Runtime.exe
5848	System.Runtime.exe
5848	System.Runtime.exe
5848	System.Runtime.exe
5848	System.Runtime.exe
5848	System.Runtime.exe
5848	System.Runtime.exe
5848	System.Runtime.exe
5848	System.Runtime.exe
5640	$77Runtime Broker.exe
4696	powershell.exe
4696	powershell.exe

Suspicious use of AdjustPrivilegeToken 6 IoCs

description	pid	Process
Token: SeBackupPrivilege	4372	vssvc.exe
Token: SeRestorePrivilege	4372	vssvc.exe
Token: SeAuditPrivilege	4372	vssvc.exe
Token: SeDebugPrivilege	5848	System.Runtime.exe
Token: SeDebugPrivilege	5640	$77Runtime Broker.exe
Token: SeDebugPrivilege	4696	powershell.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
5640	$77Runtime Broker.exe

Suspicious use of WriteProcessMemory 20 IoCs

description	pid	Process	procid_target
PID 5848 wrote to memory of 5396	5848	System.Runtime.exe	85
PID 5848 wrote to memory of 5396	5848	System.Runtime.exe	85
PID 5848 wrote to memory of 3636	5848	System.Runtime.exe	87
PID 5848 wrote to memory of 3636	5848	System.Runtime.exe	87
PID 5848 wrote to memory of 5764	5848	System.Runtime.exe	90
PID 5848 wrote to memory of 5764	5848	System.Runtime.exe	90
PID 5764 wrote to memory of 3228	5764	cmd.exe	92
PID 5764 wrote to memory of 3228	5764	cmd.exe	92
PID 5764 wrote to memory of 5640	5764	cmd.exe	93
PID 5764 wrote to memory of 5640	5764	cmd.exe	93
PID 5640 wrote to memory of 1748	5640	$77Runtime Broker.exe	95
PID 5640 wrote to memory of 1748	5640	$77Runtime Broker.exe	95
PID 5640 wrote to memory of 2268	5640	$77Runtime Broker.exe	97
PID 5640 wrote to memory of 2268	5640	$77Runtime Broker.exe	97
PID 5640 wrote to memory of 4592	5640	$77Runtime Broker.exe	99
PID 5640 wrote to memory of 4592	5640	$77Runtime Broker.exe	99
PID 5640 wrote to memory of 4696	5640	$77Runtime Broker.exe	101
PID 5640 wrote to memory of 4696	5640	$77Runtime Broker.exe	101
PID 5640 wrote to memory of 4680	5640	$77Runtime Broker.exe	103
PID 5640 wrote to memory of 4680	5640	$77Runtime Broker.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
5396	attrib.exe
3636	attrib.exe

C:\Users\Admin\AppData\Local\Temp\System.Runtime.exe
"C:\Users\Admin\AppData\Local\Temp\System.Runtime.exe"
1⤵
- Checks computer location settings
- Adds Run key to start application
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:5848
- C:\Windows\System32\attrib.exe
  "C:\Windows\System32\attrib.exe" +s +h "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Templates\WinTask"
  2⤵
  - Sets file to hidden
  - Views/modifies file attributes
  PID:5396
- C:\Windows\System32\attrib.exe
  "C:\Windows\System32\attrib.exe" +s +h "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Templates\WinTask\$77Runtime Broker.exe"
  2⤵
  - Sets file to hidden
  - Views/modifies file attributes
  PID:3636
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpB9CA.tmp.bat""
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:5764
- - C:\Windows\system32\timeout.exe
    timeout 3
    3⤵
    - Delays execution with timeout.exe
    PID:3228
- - C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Templates\WinTask\$77Runtime Broker.exe
    "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Templates\WinTask\$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:5640
  - - C:\Windows\SYSTEM32\schtasks.exe
      "schtasks.exe" /query /TN $77Runtime Broker.exe
      4⤵
      PID:1748
  - - C:\Windows\SYSTEM32\schtasks.exe
      "schtasks.exe" /Create /SC ONCE /TN "$77Runtime Broker.exe" /TR "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Templates\WinTask\$77Runtime Broker.exe \"\$77Runtime Broker.exe\" /AsAdmin" /ST 00:01 /IT /F /RL HIGHEST
      4⤵
      Scheduled Task/Job: Scheduled Task
      PID:2268
  - - C:\Windows\SYSTEM32\schtasks.exe
      "schtasks.exe" /query /TN $77Runtime Broker.exe
      4⤵
      PID:4592
  - - 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:4696
  - - 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:4680

C:\Windows\system32\vssvc.exe
C:\Windows\system32\vssvc.exe
1⤵
- Suspicious use of AdjustPrivilegeToken
PID:4372

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_4pkyoimn.qbg.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmpB9CA.tmp.bat

Filesize
197B

MD5
3b8dba165d028e8e0a500761c12abd20

SHA1
28a87d63c0777d675c3e8c88b85be14411f0c5b8

SHA256
98e19b7471894d5cb09139e4c992c5eb88dbd8d715afb51e26d371c44aed5c41

SHA512
00fab7071a0f9d97471e89403a62f34351471b60cee4b9c45d240e8c96b2f27b419dc015741328ceb3647f5048e127258ae14f3d527d93dc3f9434184a1a2971

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

Filesize
43KB

MD5
8f06957fd43a38298aa9d6f4bc52c7a7

SHA1
01a72c623c0ce786e01fbc3c165bb1c099a2dc1a

SHA256
afe42ee135f9bbcc385db5751b4867e99aa4caa862bcaaf312e4355a5323145d

SHA512
4b0283befc959340041cfb8c03caccfe3f32971434f34f85c80eba9921bd6e26e664287ec7826492f2047309bfc86e472aa8cb740008df6cf7b61ac94a54484e

Download Submit
memory/4696-19-0x0000028B2DC30000-0x0000028B2DC52000-memory.dmp

Filesize
136KB

Download
memory/5848-0-0x00007FF89B8F3000-0x00007FF89B8F5000-memory.dmp

Filesize
8KB

Download
memory/5848-1-0x0000000000730000-0x0000000000740000-memory.dmp

Filesize
64KB

Download
memory/5848-2-0x00007FF89B8F0000-0x00007FF89C3B1000-memory.dmp

Filesize
10.8MB

Download
memory/5848-3-0x00007FF89B8F3000-0x00007FF89B8F5000-memory.dmp

Filesize
8KB

Download
memory/5848-4-0x00007FF89B8F0000-0x00007FF89C3B1000-memory.dmp

Filesize
10.8MB

Download
memory/5848-10-0x00007FF89B8F0000-0x00007FF89C3B1000-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