silverrat | ebb23e2966d195bce807cbe2d06058402e010bc919d76819847644673bfdbce2

Analysis

max time kernel
130s
max time network
150s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
31-12-2024 16:58

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General

Target

SilverRat V1.5 [Re Lab]/Fixer.exe
Size

45KB
MD5

545d64cc91e4da6339a70d54a2443c5d
SHA1

f03344ab824c7cf0f73dcc86aa34cab36e2e54e7
SHA256

04109cb3426408945bea79e8e355285fb5bf93224b5b2775a5f6ff6c1e992b5f
SHA512

733154a7f76840fad3ead2af149cf708807878ef3f08c62232ee3cdc0b7e6a4b4dc338103569daf9f755a6549475df15b34b7f223929348001d4086e83371681
SSDEEP

768:OarX4D9pmZGOXnXhEk75rVeZtxbuRULQj9SEQf9B6SbuDFvr1/xf:OarID9pVU5rVe3xCGsj9O9oQ2Fx/xf

Score

10^/10

silverrat evasion execution persistence trojan

Malware Config

Extracted

Family

silverrat

Version

1.0.0.0

auto-london.gl.at.ply.gg:51655

Mutex

SilverMutex_kTAAZjMenK

Attributes

certificate
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
decrypted_key
-|S.S.S|-
discord
https://discord.com/api/webhooks/1253749007772160090/mxExcAUGlJgTCbYOk_u7JJAnNpsIhMne5e0PjqkRY2MV_40Bgpix2Ezib84aFxRmN66j
key
yy6zDjAUmbB09pKvo5Hhug==
key_x509
QnZ2VW1rTFlUa09ESXhCRkdHYURSSlBBdk5SQk5J
payload_url
https://g.top4top.io/p_2522c7w8u1.png
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.

evasion

Hidden Files and Directories

T1564.001

pid	Process
3120	attrib.exe
3564	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-1-5-21-2437139445-1151884604-3026847218-1000\Control Panel\International\Geo\Nation	Fixer.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2437139445-1151884604-3026847218-1000\Control Panel\International\Geo\Nation	$77Runtime Broker.exe

Executes dropped EXE 1 IoCs

pid	Process
436	$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\\hgfdfd\\$77Runtime Broker.exe\""	Fixer.exe

Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

Using powershell.exe command.

execution

PowerShell

T1059.001

pid	Process
2500	powershell.exe

Legitimate hosting services abused for malware hosting/C2 1 TTPs 2 IoCs

Web Service

T1102

flow	ioc
19	discord.com
20	discord.com

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

evasion

pid	Process
4264	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
4568	schtasks.exe
3912	schtasks.exe

Suspicious behavior: EnumeratesProcesses 26 IoCs

pid	Process
1824	Fixer.exe
1824	Fixer.exe
1824	Fixer.exe
1824	Fixer.exe
1824	Fixer.exe
1824	Fixer.exe
1824	Fixer.exe
1824	Fixer.exe
1824	Fixer.exe
1824	Fixer.exe
1824	Fixer.exe
1824	Fixer.exe
1824	Fixer.exe
1824	Fixer.exe
1824	Fixer.exe
1824	Fixer.exe
1824	Fixer.exe
1824	Fixer.exe
1824	Fixer.exe
1824	Fixer.exe
1824	Fixer.exe
1824	Fixer.exe
1824	Fixer.exe
2500	powershell.exe
2500	powershell.exe
436	$77Runtime Broker.exe

Suspicious use of AdjustPrivilegeToken 6 IoCs

description	pid	Process
Token: SeBackupPrivilege	3372	vssvc.exe
Token: SeRestorePrivilege	3372	vssvc.exe
Token: SeAuditPrivilege	3372	vssvc.exe
Token: SeDebugPrivilege	1824	Fixer.exe
Token: SeDebugPrivilege	436	$77Runtime Broker.exe
Token: SeDebugPrivilege	2500	powershell.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
436	$77Runtime Broker.exe

Suspicious use of WriteProcessMemory 20 IoCs

description	pid	Process	procid_target
PID 1824 wrote to memory of 3564	1824	Fixer.exe	87
PID 1824 wrote to memory of 3564	1824	Fixer.exe	87
PID 1824 wrote to memory of 3120	1824	Fixer.exe	89
PID 1824 wrote to memory of 3120	1824	Fixer.exe	89
PID 1824 wrote to memory of 2172	1824	Fixer.exe	100
PID 1824 wrote to memory of 2172	1824	Fixer.exe	100
PID 2172 wrote to memory of 4264	2172	cmd.exe	102
PID 2172 wrote to memory of 4264	2172	cmd.exe	102
PID 2172 wrote to memory of 436	2172	cmd.exe	107
PID 2172 wrote to memory of 436	2172	cmd.exe	107
PID 436 wrote to memory of 1804	436	$77Runtime Broker.exe	109
PID 436 wrote to memory of 1804	436	$77Runtime Broker.exe	109
PID 436 wrote to memory of 4568	436	$77Runtime Broker.exe	111
PID 436 wrote to memory of 4568	436	$77Runtime Broker.exe	111
PID 436 wrote to memory of 2772	436	$77Runtime Broker.exe	113
PID 436 wrote to memory of 2772	436	$77Runtime Broker.exe	113
PID 436 wrote to memory of 2500	436	$77Runtime Broker.exe	115
PID 436 wrote to memory of 2500	436	$77Runtime Broker.exe	115
PID 436 wrote to memory of 3912	436	$77Runtime Broker.exe	116
PID 436 wrote to memory of 3912	436	$77Runtime Broker.exe	116

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

evasion

Hidden Files and Directories

T1564.001

pid	Process
3564	attrib.exe
3120	attrib.exe

C:\Users\Admin\AppData\Local\Temp\SilverRat V1.5 [Re Lab]\Fixer.exe
"C:\Users\Admin\AppData\Local\Temp\SilverRat V1.5 [Re Lab]\Fixer.exe"
1⤵
- Checks computer location settings
- Adds Run key to start application
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1824
- C:\Windows\System32\attrib.exe
  "C:\Windows\System32\attrib.exe" +s +h "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Templates\hgfdfd"
  2⤵
  - Sets file to hidden
  - Views/modifies file attributes
  PID:3564
- C:\Windows\System32\attrib.exe
  "C:\Windows\System32\attrib.exe" +s +h "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Templates\hgfdfd\$77Runtime Broker.exe"
  2⤵
  - Sets file to hidden
  - Views/modifies file attributes
  PID:3120
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpF211.tmp.bat""
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:2172
- - C:\Windows\system32\timeout.exe
    timeout 3
    3⤵
    - Delays execution with timeout.exe
    PID:4264
- - C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Templates\hgfdfd\$77Runtime Broker.exe
    "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Templates\hgfdfd\$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:436
  - - C:\Windows\SYSTEM32\schtasks.exe
      "schtasks.exe" /query /TN $77Runtime Broker.exe
      4⤵
      PID:1804
  - - C:\Windows\SYSTEM32\schtasks.exe
      "schtasks.exe" /Create /SC ONCE /TN "$77Runtime Broker.exe" /TR "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Templates\hgfdfd\$77Runtime Broker.exe \"\$77Runtime Broker.exe\" /AsAdmin" /ST 00:01 /IT /F /RL HIGHEST
      4⤵
      Scheduled Task/Job: Scheduled Task
      PID:4568
  - - C:\Windows\SYSTEM32\schtasks.exe
      "schtasks.exe" /query /TN $77Runtime Broker.exe
      4⤵
      PID:2772
  - - 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:2500
  - - 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:3912

C:\Windows\system32\vssvc.exe
C:\Windows\system32\vssvc.exe
1⤵
- Suspicious use of AdjustPrivilegeToken
PID:3372

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

T1059

PowerShell

T1059.001

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Defense Evasion

Hide Artifacts

T1564

Hidden Files and Directories

T1564.001

Modify Registry

T1112

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Web Service

T1102

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_l30h3gfn.xis.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmpF211.tmp.bat

Filesize
196B

MD5
ebec561867e7652c24c67ebbbd113980

SHA1
12f21959a9055394acf338ea4cdb8eeff2ffb9ec

SHA256
b5fd97046b076c14da800f4fc08c7de958fbef4ebb8353648b03fab531f2c307

SHA512
4c5bf304c032683dd511ed8a6bdfa7283aaeb6a29d13a96e9d29d744f38b2aa83c66d4a865a8a0532070b0ce94e2c8ccd5857bdc50770a9d6e328e44ad2ff883

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

Filesize
45KB

MD5
545d64cc91e4da6339a70d54a2443c5d

SHA1
f03344ab824c7cf0f73dcc86aa34cab36e2e54e7

SHA256
04109cb3426408945bea79e8e355285fb5bf93224b5b2775a5f6ff6c1e992b5f

SHA512
733154a7f76840fad3ead2af149cf708807878ef3f08c62232ee3cdc0b7e6a4b4dc338103569daf9f755a6549475df15b34b7f223929348001d4086e83371681

Download Submit
memory/1824-0-0x00007FFAC20B3000-0x00007FFAC20B5000-memory.dmp

Filesize
8KB

Download
memory/1824-1-0x00000000002E0000-0x00000000002F0000-memory.dmp

Filesize
64KB

Download
memory/1824-2-0x00007FFAC20B0000-0x00007FFAC2B71000-memory.dmp

Filesize
10.8MB

Download
memory/1824-3-0x00007FFAC20B3000-0x00007FFAC20B5000-memory.dmp

Filesize
8KB

Download
memory/1824-4-0x00007FFAC20B0000-0x00007FFAC2B71000-memory.dmp

Filesize
10.8MB

Download
memory/1824-10-0x00007FFAC20B0000-0x00007FFAC2B71000-memory.dmp

Filesize
10.8MB

Download
memory/2500-23-0x000001A2F7290000-0x000001A2F72B2000-memory.dmp

Filesize
136KB

Download