silverrat | 769b2096c5e801845d1ed7d738ddab14a87afaf21d074ff29fe4cdbbcdd3b447

General

Target

Runtime Broker.exe
Size

43KB
MD5

a05372ded01cb9c4c59ebde5f3e688f3
SHA1

f4950fc4cf6470afdeeb19bdba551445f2046bc9
SHA256

769b2096c5e801845d1ed7d738ddab14a87afaf21d074ff29fe4cdbbcdd3b447
SHA512

3ef7823a3d230fbfd7b003fc417c5bceac840ff889f75e47b24cb0695cf79999807f2948cdfc3ad6db2a0eb85a3e739814f7d596bfd1fdaf7c92e7edf68d0bf7
SSDEEP

768:5FoacjSeq8F9/Ol6IoZmkPH5m79WwIf9+ou0BRULQW9PrGSz1QB6S5/l/:5F/cjSetatyBm8HkEBGsW9a+1Qoe/l/

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
43
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
4504	attrib.exe
5720	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	Runtime Broker.exe
Key value queried	\REGISTRY\USER\S-1-5-21-1279544337-3716153908-718418795-1000\Control Panel\International\Geo\Nation	$77RuntimeBroker.exe

Executes dropped EXE 2 IoCs

pid	Process
5124	$77RuntimeBroker.exe
1500	$77RuntimeBroker.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\\SysTask\\$77RuntimeBroker.exe\""	Runtime Broker.exe

Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

Using powershell.exe command.

execution

PowerShell

T1059.001

pid	Process
2044	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
464	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
1120	schtasks.exe
2528	schtasks.exe

Suspicious behavior: EnumeratesProcesses 28 IoCs

pid	Process
5296	Runtime Broker.exe
5296	Runtime Broker.exe
5296	Runtime Broker.exe
5296	Runtime Broker.exe
5296	Runtime Broker.exe
5296	Runtime Broker.exe
5296	Runtime Broker.exe
5296	Runtime Broker.exe
5296	Runtime Broker.exe
5296	Runtime Broker.exe
5296	Runtime Broker.exe
5296	Runtime Broker.exe
5296	Runtime Broker.exe
5296	Runtime Broker.exe
5296	Runtime Broker.exe
5296	Runtime Broker.exe
5296	Runtime Broker.exe
5296	Runtime Broker.exe
5296	Runtime Broker.exe
5296	Runtime Broker.exe
5296	Runtime Broker.exe
5296	Runtime Broker.exe
5296	Runtime Broker.exe
5124	$77RuntimeBroker.exe
5124	$77RuntimeBroker.exe
2044	powershell.exe
2044	powershell.exe
2044	powershell.exe

Suspicious use of AdjustPrivilegeToken 6 IoCs

description	pid	Process
Token: SeBackupPrivilege	5228	vssvc.exe
Token: SeRestorePrivilege	5228	vssvc.exe
Token: SeAuditPrivilege	5228	vssvc.exe
Token: SeDebugPrivilege	5296	Runtime Broker.exe
Token: SeDebugPrivilege	5124	$77RuntimeBroker.exe
Token: SeDebugPrivilege	2044	powershell.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
5124	$77RuntimeBroker.exe

Suspicious use of WriteProcessMemory 22 IoCs

description	pid	Process	procid_target
PID 5296 wrote to memory of 4504	5296	Runtime Broker.exe	93
PID 5296 wrote to memory of 4504	5296	Runtime Broker.exe	93
PID 5296 wrote to memory of 5720	5296	Runtime Broker.exe	95
PID 5296 wrote to memory of 5720	5296	Runtime Broker.exe	95
PID 5296 wrote to memory of 4384	5296	Runtime Broker.exe	106
PID 5296 wrote to memory of 4384	5296	Runtime Broker.exe	106
PID 4384 wrote to memory of 464	4384	cmd.exe	110
PID 4384 wrote to memory of 464	4384	cmd.exe	110
PID 1948 wrote to memory of 5124	1948	cmd.exe	111
PID 1948 wrote to memory of 5124	1948	cmd.exe	111
PID 5124 wrote to memory of 1456	5124	$77RuntimeBroker.exe	113
PID 5124 wrote to memory of 1456	5124	$77RuntimeBroker.exe	113
PID 5124 wrote to memory of 1120	5124	$77RuntimeBroker.exe	115
PID 5124 wrote to memory of 1120	5124	$77RuntimeBroker.exe	115
PID 5124 wrote to memory of 3892	5124	$77RuntimeBroker.exe	117
PID 5124 wrote to memory of 3892	5124	$77RuntimeBroker.exe	117
PID 5124 wrote to memory of 2044	5124	$77RuntimeBroker.exe	119
PID 5124 wrote to memory of 2044	5124	$77RuntimeBroker.exe	119
PID 5124 wrote to memory of 2528	5124	$77RuntimeBroker.exe	120
PID 5124 wrote to memory of 2528	5124	$77RuntimeBroker.exe	120
PID 4384 wrote to memory of 1500	4384	cmd.exe	123
PID 4384 wrote to memory of 1500	4384	cmd.exe	123

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
4504	attrib.exe
5720	attrib.exe

C:\Users\Admin\AppData\Local\Temp\Runtime Broker.exe
"C:\Users\Admin\AppData\Local\Temp\Runtime Broker.exe"
1⤵
- Checks computer location settings
- Adds Run key to start application
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:5296
- C:\Windows\System32\attrib.exe
  "C:\Windows\System32\attrib.exe" +s +h "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Templates\SysTask"
  2⤵
  - Sets file to hidden
  - Views/modifies file attributes
  PID:4504
- C:\Windows\System32\attrib.exe
  "C:\Windows\System32\attrib.exe" +s +h "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Templates\SysTask\$77RuntimeBroker.exe"
  2⤵
  - Sets file to hidden
  - Views/modifies file attributes
  PID:5720
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpB6CD.tmp.bat""
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:4384
- - C:\Windows\system32\timeout.exe
    timeout 3
    3⤵
    - Delays execution with timeout.exe
    PID:464
- - C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Templates\SysTask\$77RuntimeBroker.exe
    "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Templates\SysTask\$77RuntimeBroker.exe"
    3⤵
    - Executes dropped EXE
    PID:1500

C:\Windows\system32\vssvc.exe
C:\Windows\system32\vssvc.exe
1⤵
- Suspicious use of AdjustPrivilegeToken
PID:5228

C:\Windows\system32\cmd.exe
C:\Windows\system32\cmd.exe /c "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Templates\SysTask\$77RuntimeBroker.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:1948
- C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Templates\SysTask\$77RuntimeBroker.exe
  C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Templates\SysTask\$77RuntimeBroker.exe
  2⤵
  - Checks computer location settings
  - Executes dropped EXE
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:5124
- - C:\Windows\system32\schtasks.exe
    "schtasks.exe" /query /TN $77RuntimeBroker.exe
    3⤵
    PID:1456
- - C:\Windows\system32\schtasks.exe
    "schtasks.exe" /Create /SC ONCE /TN "$77RuntimeBroker.exe" /TR "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Templates\SysTask\$77RuntimeBroker.exe \"\$77RuntimeBroker.exe\" /AsAdmin" /ST 00:01 /IT /F /RL HIGHEST
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:1120
- - C:\Windows\system32\schtasks.exe
    "schtasks.exe" /query /TN $77RuntimeBroker.exe
    3⤵
    PID:3892
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Set-MpPreference -ExclusionExtension exe,bat,dll,ps1;exit
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:2044
- - C:\Windows\System32\schtasks.exe
    "C:\Windows\System32\schtasks.exe" /create /sc daily /tn "RuntimeBroker_Task-DAILY-21PM" /TR "%MyFile%" /ST 21:00
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:2528

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

Replay Monitor

Loading Replay Monitor...

Downloads

C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_namxnnxa.ser.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmpB6CD.tmp.bat

Filesize
196B

MD5
2c31bce7e188eb7033675daf0c598d22

SHA1
600443fe3e455722b7634300adfe2d7c81c9aad1

SHA256
a0b7e761209a88d4ed836fffe03913a123467fd5ba926dedce7b230efe221e6e

SHA512
54e46cd9386d382de025dc3f82ff19eba7cb05219c02ac0fe2e8e3d99139ec50a9d34769662ebbe94eb6f23195dec21b1ac38c4a3a643cb00b80c59ca2074f45

Download Submit
C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Templates\SysTask\$77RuntimeBroker.exe

Filesize
43KB

MD5
a05372ded01cb9c4c59ebde5f3e688f3

SHA1
f4950fc4cf6470afdeeb19bdba551445f2046bc9

SHA256
769b2096c5e801845d1ed7d738ddab14a87afaf21d074ff29fe4cdbbcdd3b447

SHA512
3ef7823a3d230fbfd7b003fc417c5bceac840ff889f75e47b24cb0695cf79999807f2948cdfc3ad6db2a0eb85a3e739814f7d596bfd1fdaf7c92e7edf68d0bf7

Download Submit
memory/2044-23-0x00000242B6B80000-0x00000242B6BA2000-memory.dmp

Filesize
136KB

Download
memory/5124-30-0x000000001E040000-0x000000001E050000-memory.dmp

Filesize
64KB

Download
memory/5296-0-0x00007FFEDE663000-0x00007FFEDE665000-memory.dmp

Filesize
8KB

Download
memory/5296-1-0x0000000000640000-0x0000000000650000-memory.dmp

Filesize
64KB

Download
memory/5296-2-0x00007FFEDE660000-0x00007FFEDF121000-memory.dmp

Filesize
10.8MB

Download
memory/5296-3-0x00007FFEDE663000-0x00007FFEDE665000-memory.dmp

Filesize
8KB

Download
memory/5296-4-0x00007FFEDE660000-0x00007FFEDF121000-memory.dmp

Filesize
10.8MB

Download
memory/5296-10-0x00007FFEDE660000-0x00007FFEDF121000-memory.dmp

Filesize
10.8MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads