silverrat | a6eb97732429a680d777c44c010b851064d89500764dfb50af2ceab258b4cb18

General

Target

RuntimeBroker.exe
Size

43KB
MD5

fc12a2e6f37c028c1b3e8a4edf24ca99
SHA1

e13e7c83047eed30602f5ee2d29c8360090c4c23
SHA256

a6eb97732429a680d777c44c010b851064d89500764dfb50af2ceab258b4cb18
SHA512

f15f0c4e328dc551b80885aa4929d91d762fb21a94c1b3ccd68b20dd0a673c6ad218a921d30eda684d821c234b22bb59ad87f77aacce357f1d909d8cd3bdf663
SSDEEP

768:hID/0cMxrB4YDcHWxYQ4xJCHrR8kq/5E0Sxhnhxrbgx5/RULQ6T9SNHX9B6SW/T/:hIDMcMxrmQb5rq/5EtlbgxtGsY98X9oJ

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

Mutex_DthEiIseBZ

Attributes

certificate
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
decrypted_key
-|S.S.S|-
key
yy6zDjAUmbB09pKvo5Hhug==
key_x509
QnZ2VW1rTFlUa09ESXhCRkdHYURSSlBBdk5SQk5J
reconnect_delay
0
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
5476	attrib.exe
5548	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-1-5-21-2978821131-3074124650-3401057062-1000\Control Panel\International\Geo\Nation	RuntimeBroker.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2978821131-3074124650-3401057062-1000\Control Panel\International\Geo\Nation	$77Runtime Broker.exe

Executes dropped EXE 1 IoCs

pid	Process
3972	$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\\SysTemp64\\$77Runtime Broker.exe\""	RuntimeBroker.exe

Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

Using powershell.exe command.

execution

PowerShell

T1059.001

pid	Process
2560	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
5700	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
4900	schtasks.exe
840	schtasks.exe

Suspicious behavior: EnumeratesProcesses 22 IoCs

pid	Process
3480	RuntimeBroker.exe
3480	RuntimeBroker.exe
3480	RuntimeBroker.exe
3480	RuntimeBroker.exe
3480	RuntimeBroker.exe
3480	RuntimeBroker.exe
3480	RuntimeBroker.exe
3480	RuntimeBroker.exe
3480	RuntimeBroker.exe
3480	RuntimeBroker.exe
3480	RuntimeBroker.exe
3480	RuntimeBroker.exe
3480	RuntimeBroker.exe
3480	RuntimeBroker.exe
3480	RuntimeBroker.exe
3480	RuntimeBroker.exe
3480	RuntimeBroker.exe
3480	RuntimeBroker.exe
3480	RuntimeBroker.exe
3972	$77Runtime Broker.exe
2560	powershell.exe
2560	powershell.exe

Suspicious use of AdjustPrivilegeToken 6 IoCs

description	pid	Process
Token: SeBackupPrivilege	5316	vssvc.exe
Token: SeRestorePrivilege	5316	vssvc.exe
Token: SeAuditPrivilege	5316	vssvc.exe
Token: SeDebugPrivilege	3480	RuntimeBroker.exe
Token: SeDebugPrivilege	3972	$77Runtime Broker.exe
Token: SeDebugPrivilege	2560	powershell.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3972	$77Runtime Broker.exe

Suspicious use of WriteProcessMemory 20 IoCs

description	pid	Process	procid_target
PID 3480 wrote to memory of 5476	3480	RuntimeBroker.exe	86
PID 3480 wrote to memory of 5476	3480	RuntimeBroker.exe	86
PID 3480 wrote to memory of 5548	3480	RuntimeBroker.exe	88
PID 3480 wrote to memory of 5548	3480	RuntimeBroker.exe	88
PID 3480 wrote to memory of 1872	3480	RuntimeBroker.exe	92
PID 3480 wrote to memory of 1872	3480	RuntimeBroker.exe	92
PID 1872 wrote to memory of 5700	1872	cmd.exe	94
PID 1872 wrote to memory of 5700	1872	cmd.exe	94
PID 1872 wrote to memory of 3972	1872	cmd.exe	95
PID 1872 wrote to memory of 3972	1872	cmd.exe	95
PID 3972 wrote to memory of 4708	3972	$77Runtime Broker.exe	97
PID 3972 wrote to memory of 4708	3972	$77Runtime Broker.exe	97
PID 3972 wrote to memory of 4900	3972	$77Runtime Broker.exe	99
PID 3972 wrote to memory of 4900	3972	$77Runtime Broker.exe	99
PID 3972 wrote to memory of 5260	3972	$77Runtime Broker.exe	101
PID 3972 wrote to memory of 5260	3972	$77Runtime Broker.exe	101
PID 3972 wrote to memory of 2560	3972	$77Runtime Broker.exe	103
PID 3972 wrote to memory of 2560	3972	$77Runtime Broker.exe	103
PID 3972 wrote to memory of 840	3972	$77Runtime Broker.exe	105
PID 3972 wrote to memory of 840	3972	$77Runtime Broker.exe	105

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
5476	attrib.exe
5548	attrib.exe

C:\Users\Admin\AppData\Local\Temp\RuntimeBroker.exe
"C:\Users\Admin\AppData\Local\Temp\RuntimeBroker.exe"
1⤵
- Checks computer location settings
- Adds Run key to start application
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3480
- C:\Windows\System32\attrib.exe
  "C:\Windows\System32\attrib.exe" +s +h "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Templates\SysTemp64"
  2⤵
  - Sets file to hidden
  - Views/modifies file attributes
  PID:5476
- C:\Windows\System32\attrib.exe
  "C:\Windows\System32\attrib.exe" +s +h "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Templates\SysTemp64\$77Runtime Broker.exe"
  2⤵
  - Sets file to hidden
  - Views/modifies file attributes
  PID:5548
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp904.tmp.bat""
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:1872
- - C:\Windows\system32\timeout.exe
    timeout 3
    3⤵
    - Delays execution with timeout.exe
    PID:5700
- - C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Templates\SysTemp64\$77Runtime Broker.exe
    "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Templates\SysTemp64\$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:3972
  - - C:\Windows\SYSTEM32\schtasks.exe
      "schtasks.exe" /query /TN $77Runtime Broker.exe
      4⤵
      PID:4708
  - - C:\Windows\SYSTEM32\schtasks.exe
      "schtasks.exe" /Create /SC ONCE /TN "$77Runtime Broker.exe" /TR "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Templates\SysTemp64\$77Runtime Broker.exe \"\$77Runtime Broker.exe\" /AsAdmin" /ST 00:01 /IT /F /RL HIGHEST
      4⤵
      Scheduled Task/Job: Scheduled Task
      PID:4900
  - - C:\Windows\SYSTEM32\schtasks.exe
      "schtasks.exe" /query /TN $77Runtime Broker.exe
      4⤵
      PID:5260
  - - 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:2560
  - - 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:840

C:\Windows\system32\vssvc.exe
C:\Windows\system32\vssvc.exe
1⤵
- Suspicious use of AdjustPrivilegeToken
PID:5316

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_aq4zcmix.n1u.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmp904.tmp.bat

Filesize
198B

MD5
3b1d0f84d110fb4546194c4c48f9ea70

SHA1
31003c50154d79c6f2dccc630984972f6bc9b980

SHA256
75958a936b95764ebdcc45f1f01f7f59c125e3211dd857fdef78726bf98f37d4

SHA512
661b8f2f9024c431314928a5a092f3f271bea31cb73740ae923a33e2339808b467fe5d22542cc3def5aebcc7feee3e10e9807de1bb29b3f49847868a4c092c18

Download Submit
C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Templates\SysTemp64\$77Runtime Broker.exe

Filesize
43KB

MD5
fc12a2e6f37c028c1b3e8a4edf24ca99

SHA1
e13e7c83047eed30602f5ee2d29c8360090c4c23

SHA256
a6eb97732429a680d777c44c010b851064d89500764dfb50af2ceab258b4cb18

SHA512
f15f0c4e328dc551b80885aa4929d91d762fb21a94c1b3ccd68b20dd0a673c6ad218a921d30eda684d821c234b22bb59ad87f77aacce357f1d909d8cd3bdf663

Download Submit
memory/2560-16-0x0000022F4C520000-0x0000022F4C542000-memory.dmp

Filesize
136KB

Download
memory/3480-1-0x0000000000710000-0x0000000000720000-memory.dmp

Filesize
64KB

Download
memory/3480-0-0x00007FFF83B13000-0x00007FFF83B15000-memory.dmp

Filesize
8KB

Download
memory/3480-2-0x00007FFF83B13000-0x00007FFF83B15000-memory.dmp

Filesize
8KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads