silverrat | edc876045d945c73f2746b87e8aa73415026f6771c114320fefdc5e73828faea

General

Target

System.Runtime.exe
Size

134KB
MD5

e7621d95185c721aa9e1002703b82fb1
SHA1

187d8a5a6d5244b981e523cce95081055e59150e
SHA256

edc876045d945c73f2746b87e8aa73415026f6771c114320fefdc5e73828faea
SHA512

f2438061ee21db1fd3d82ffbd4064ca1b6c8574d637441f728c5133918b44948647953b91c25795ad0056f74e6f6e15d6349244b122940c6c977a6946fbf0137
SSDEEP

1536:9gAlZHY+5D5YEtSMxuJyxq7J7BmfRNULyvUrTd0E8pXOAIT/Rk0MEMxNGJVuFjvy:9hXYRI3KBms7dwpXOAoRLEfGnDwcPlgY

Score

10^/10

silverrat defense_evasion discovery 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
2396	attrib.exe
2864	attrib.exe

Executes dropped EXE 2 IoCs

pid	Process
2740	System.Runtime.exe
2732	$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
3996	powershell.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

System Location Discovery: System Language Discovery 1 TTPs 1 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	System.Runtime.exe

Delays execution with timeout.exe 1 IoCs

defense_evasion

pid	Process
2284	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
4072	schtasks.exe
2032	schtasks.exe

Suspicious behavior: EnumeratesProcesses 22 IoCs

pid	Process
2740	System.Runtime.exe
2740	System.Runtime.exe
2740	System.Runtime.exe
2740	System.Runtime.exe
2740	System.Runtime.exe
2740	System.Runtime.exe
2740	System.Runtime.exe
2740	System.Runtime.exe
2740	System.Runtime.exe
2740	System.Runtime.exe
2740	System.Runtime.exe
2740	System.Runtime.exe
2740	System.Runtime.exe
2740	System.Runtime.exe
2740	System.Runtime.exe
2740	System.Runtime.exe
2740	System.Runtime.exe
2740	System.Runtime.exe
2740	System.Runtime.exe
2732	$77Runtime Broker.exe
3996	powershell.exe
3996	powershell.exe

Suspicious use of AdjustPrivilegeToken 6 IoCs

description	pid	Process
Token: SeBackupPrivilege	4888	vssvc.exe
Token: SeRestorePrivilege	4888	vssvc.exe
Token: SeAuditPrivilege	4888	vssvc.exe
Token: SeDebugPrivilege	2740	System.Runtime.exe
Token: SeDebugPrivilege	2732	$77Runtime Broker.exe
Token: SeDebugPrivilege	3996	powershell.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2732	$77Runtime Broker.exe

Suspicious use of WriteProcessMemory 22 IoCs

description	pid	Process	procid_target
PID 2280 wrote to memory of 2740	2280	System.Runtime.exe	80
PID 2280 wrote to memory of 2740	2280	System.Runtime.exe	80
PID 2740 wrote to memory of 2396	2740	System.Runtime.exe	85
PID 2740 wrote to memory of 2396	2740	System.Runtime.exe	85
PID 2740 wrote to memory of 2864	2740	System.Runtime.exe	87
PID 2740 wrote to memory of 2864	2740	System.Runtime.exe	87
PID 2740 wrote to memory of 3432	2740	System.Runtime.exe	89
PID 2740 wrote to memory of 3432	2740	System.Runtime.exe	89
PID 3432 wrote to memory of 2284	3432	cmd.exe	91
PID 3432 wrote to memory of 2284	3432	cmd.exe	91
PID 3432 wrote to memory of 2732	3432	cmd.exe	92
PID 3432 wrote to memory of 2732	3432	cmd.exe	92
PID 2732 wrote to memory of 2728	2732	$77Runtime Broker.exe	94
PID 2732 wrote to memory of 2728	2732	$77Runtime Broker.exe	94
PID 2732 wrote to memory of 4072	2732	$77Runtime Broker.exe	96
PID 2732 wrote to memory of 4072	2732	$77Runtime Broker.exe	96
PID 2732 wrote to memory of 2840	2732	$77Runtime Broker.exe	98
PID 2732 wrote to memory of 2840	2732	$77Runtime Broker.exe	98
PID 2732 wrote to memory of 3996	2732	$77Runtime Broker.exe	100
PID 2732 wrote to memory of 3996	2732	$77Runtime Broker.exe	100
PID 2732 wrote to memory of 2032	2732	$77Runtime Broker.exe	102
PID 2732 wrote to memory of 2032	2732	$77Runtime Broker.exe	102

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
2396	attrib.exe
2864	attrib.exe

C:\Users\Admin\AppData\Local\Temp\System.Runtime.exe
"C:\Users\Admin\AppData\Local\Temp\System.Runtime.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2280
- C:\Users\Admin\AppData\Local\Microsoft\Windows\Security\{FEFl0DED-35SE-4e06-938l-9B24D7F7CC88}.{2559a1f2-21d7-11d4-bdaf-00c04f60b9f0}\System.Runtime.exe
  C:\Users\Admin\AppData\Local\Microsoft\Windows\Security\{FEFl0DED-35SE-4e06-938l-9B24D7F7CC88}.{2559a1f2-21d7-11d4-bdaf-00c04f60b9f0}\System.Runtime.exe
  2⤵
  - Executes dropped EXE
  - Adds Run key to start application
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:2740
- - C:\Windows\System32\attrib.exe
    "C:\Windows\System32\attrib.exe" +s +h "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Templates\WinTask"
    3⤵
    - Sets file to hidden
    - Views/modifies file attributes
    PID:2396
- - C:\Windows\System32\attrib.exe
    "C:\Windows\System32\attrib.exe" +s +h "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Templates\WinTask\$77Runtime Broker.exe"
    3⤵
    - Sets file to hidden
    - Views/modifies file attributes
    PID:2864
- - C:\Windows\system32\cmd.exe
    C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpF637.tmp.bat""
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:3432
  - - C:\Windows\system32\timeout.exe
      timeout 3
      4⤵
      Delays execution with timeout.exe
      PID:2284
  - - C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Templates\WinTask\$77Runtime Broker.exe
      "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Templates\WinTask\$77Runtime Broker.exe"
      4⤵
      Executes dropped EXE
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of SetWindowsHookEx
      Suspicious use of WriteProcessMemory
      PID:2732
    - - C:\Windows\SYSTEM32\schtasks.exe
        
        "schtasks.exe" /query /TN $77Runtime Broker.exe
        5⤵
        
        PID:2728
    - - 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
        5⤵
        Scheduled Task/Job: Scheduled Task
        
        PID:4072
    - - C:\Windows\SYSTEM32\schtasks.exe
        
        "schtasks.exe" /query /TN $77Runtime Broker.exe
        5⤵
        
        PID:2840
    - - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        
        "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Set-MpPreference -ExclusionExtension exe,bat,dll,ps1;exit
        5⤵
        Command and Scripting Interpreter: PowerShell
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:3996
    - - 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
        5⤵
        Scheduled Task/Job: Scheduled Task
        
        PID:2032

C:\Windows\system32\vssvc.exe
C:\Windows\system32\vssvc.exe
1⤵
- Suspicious use of AdjustPrivilegeToken
PID:4888

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

1

T1012

System Information Discovery

1

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Microsoft\Windows\Security\{FEFl0DED-355E-4e06-93Bl-9B24D7F7CC88}.{2559a1f2-21d7-11d4-bdaf-00c04f60b9f0}\System.Runtime.exe

Filesize
43KB

MD5
eda12f565de784f92e5da5179bee6d26

SHA1
ae24f45b65a858604a9562eb0fcdf244e87744bd

SHA256
535d712f97deb16cbf71dfe80e91890410244bb71e3e48ef33a941eb9f89ae6c

SHA512
a75bf53ad2740fe0230b1c9b50985bd64f72ea3abd5b077dc6d0096dfbee8b2ab95019832826eff0825979ba8a82c433290307c8945e23efb9881f766cafdaba

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\Windows\Security\{FEFl0DED-35SE-4e06-938l-9B24D7F7CC88}.{2559a1f2-21d7-11d4-bdaf-00c04f60b9f0}\System.Runtime.exe

Filesize
43KB

MD5
3c7e3574e6e56d2e7a2e2c2f78555491

SHA1
cef927a96eeb7055e13d720be16773ac2407038e

SHA256
7a30e605cf7a26c63af96185710452c1ec812849a0366f6a008f0dcde815c156

SHA512
8d729a9853bc88f20902a79ca4cabb3d7f69ce1fd8335e0f82c6fb1ec3f6a3141f308c6d341f785a4b72fe053c6a0d0804b22893c40d6de66236dbdea9a53b4e

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_g1kzxcik.13h.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmpF637.tmp.bat

Filesize
197B

MD5
d36676dc17d06c59f30f74ae011fd4dd

SHA1
c63292e8267f552e12c74e0397621b0faf1f35ac

SHA256
d28a715ee0ce6240b4442f8cde7cb53dd86175b22fd6e3f66134320ad00ff6e8

SHA512
b103bac646daa79a3ed4f9898577976c65e992f5a5ee3b5a5117dd98f9a70d8ead890c47d1ffbda3b18ba56b3f6a696410cd4eb570b47c8de51786d43bf14e4f

Download Submit
memory/2740-33-0x00007FFE52753000-0x00007FFE52755000-memory.dmp

Filesize
8KB

Download
memory/2740-34-0x0000000000AD0000-0x0000000000AE2000-memory.dmp

Filesize
72KB

Download
memory/2740-35-0x00007FFE52750000-0x00007FFE53212000-memory.dmp

Filesize
10.8MB

Download
memory/2740-36-0x00007FFE52753000-0x00007FFE52755000-memory.dmp

Filesize
8KB

Download
memory/2740-37-0x00007FFE52750000-0x00007FFE53212000-memory.dmp

Filesize
10.8MB

Download
memory/2740-43-0x00007FFE52750000-0x00007FFE53212000-memory.dmp

Filesize
10.8MB

Download
memory/3996-76-0x000002325D620000-0x000002325D642000-memory.dmp

Filesize
136KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads