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
2308	attrib.exe
1888	attrib.exe

Executes dropped EXE 2 IoCs

pid	Process
2924	System.Runtime.exe
992	$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
3552	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
3044	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
2480	schtasks.exe
408	schtasks.exe

Suspicious behavior: EnumeratesProcesses 22 IoCs

pid	Process
2924	System.Runtime.exe
2924	System.Runtime.exe
2924	System.Runtime.exe
2924	System.Runtime.exe
2924	System.Runtime.exe
2924	System.Runtime.exe
2924	System.Runtime.exe
2924	System.Runtime.exe
2924	System.Runtime.exe
2924	System.Runtime.exe
2924	System.Runtime.exe
2924	System.Runtime.exe
2924	System.Runtime.exe
2924	System.Runtime.exe
2924	System.Runtime.exe
2924	System.Runtime.exe
2924	System.Runtime.exe
2924	System.Runtime.exe
2924	System.Runtime.exe
992	$77Runtime Broker.exe
3552	powershell.exe
3552	powershell.exe

Suspicious use of AdjustPrivilegeToken 6 IoCs

description	pid	Process
Token: SeBackupPrivilege	920	vssvc.exe
Token: SeRestorePrivilege	920	vssvc.exe
Token: SeAuditPrivilege	920	vssvc.exe
Token: SeDebugPrivilege	2924	System.Runtime.exe
Token: SeDebugPrivilege	992	$77Runtime Broker.exe
Token: SeDebugPrivilege	3552	powershell.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
992	$77Runtime Broker.exe

Suspicious use of WriteProcessMemory 22 IoCs

description	pid	Process	procid_target
PID 4348 wrote to memory of 2924	4348	System.Runtime.exe	81
PID 4348 wrote to memory of 2924	4348	System.Runtime.exe	81
PID 2924 wrote to memory of 2308	2924	System.Runtime.exe	86
PID 2924 wrote to memory of 2308	2924	System.Runtime.exe	86
PID 2924 wrote to memory of 1888	2924	System.Runtime.exe	88
PID 2924 wrote to memory of 1888	2924	System.Runtime.exe	88
PID 2924 wrote to memory of 4560	2924	System.Runtime.exe	90
PID 2924 wrote to memory of 4560	2924	System.Runtime.exe	90
PID 4560 wrote to memory of 3044	4560	cmd.exe	92
PID 4560 wrote to memory of 3044	4560	cmd.exe	92
PID 4560 wrote to memory of 992	4560	cmd.exe	93
PID 4560 wrote to memory of 992	4560	cmd.exe	93
PID 992 wrote to memory of 2740	992	$77Runtime Broker.exe	95
PID 992 wrote to memory of 2740	992	$77Runtime Broker.exe	95
PID 992 wrote to memory of 2480	992	$77Runtime Broker.exe	97
PID 992 wrote to memory of 2480	992	$77Runtime Broker.exe	97
PID 992 wrote to memory of 3452	992	$77Runtime Broker.exe	99
PID 992 wrote to memory of 3452	992	$77Runtime Broker.exe	99
PID 992 wrote to memory of 3552	992	$77Runtime Broker.exe	101
PID 992 wrote to memory of 3552	992	$77Runtime Broker.exe	101
PID 992 wrote to memory of 408	992	$77Runtime Broker.exe	103
PID 992 wrote to memory of 408	992	$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
2308	attrib.exe
1888	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:4348
- 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:2924
- - 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:2308
- - 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:1888
- - C:\Windows\system32\cmd.exe
    C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp6B8A.tmp.bat""
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:4560
  - - C:\Windows\system32\timeout.exe
      timeout 3
      4⤵
      Delays execution with timeout.exe
      PID:3044
  - - 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:992
    - - C:\Windows\SYSTEM32\schtasks.exe
        
        "schtasks.exe" /query /TN $77Runtime Broker.exe
        5⤵
        
        PID:2740
    - - 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:2480
    - - C:\Windows\SYSTEM32\schtasks.exe
        
        "schtasks.exe" /query /TN $77Runtime Broker.exe
        5⤵
        
        PID:3452
    - - 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:3552
    - - 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:408

C:\Windows\system32\vssvc.exe
C:\Windows\system32\vssvc.exe
1⤵
- Suspicious use of AdjustPrivilegeToken
PID:920

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_q5kqufbt.roy.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmp6B8A.tmp.bat

Filesize
197B

MD5
0d2184c231f3de20f72878373c1d7b8c

SHA1
97d02e515915fefef6999bbc0fe9936a3be91102

SHA256
639840610a070174f95cbfa91a242c1dd69f6e4d0b0af33bb48b45e432379753

SHA512
7780e2d86103d4ea7f9ff06c44e727a65595d821887c5f77c113169b1de4b3829f3e0a5e64a27fe4e06b742c1af2f85e7dd4ce3379e1b759be9de4966ad7fe77

Download Submit
memory/2924-33-0x00007FFFF3813000-0x00007FFFF3815000-memory.dmp

Filesize
8KB

Download
memory/2924-34-0x0000000000270000-0x0000000000282000-memory.dmp

Filesize
72KB

Download
memory/2924-35-0x00007FFFF3810000-0x00007FFFF42D2000-memory.dmp

Filesize
10.8MB

Download
memory/2924-36-0x00007FFFF3810000-0x00007FFFF42D2000-memory.dmp

Filesize
10.8MB

Download
memory/2924-42-0x00007FFFF3810000-0x00007FFFF42D2000-memory.dmp

Filesize
10.8MB

Download
memory/3552-72-0x000001F8F1BC0000-0x000001F8F1BE2000-memory.dmp

Filesize
136KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads