silverrat | fd8f6f8301f87bba9241fd4777c6b25ad9a1b1268c00e8893175074a7392bc6c

General

Target

SeroXen.exe
Size

44KB
MD5

7ec1d25ce5cd0afe104ee2e4389e4cf6
SHA1

fa31da5f424f7c106ff0701aab70f789cd4e445b
SHA256

fd8f6f8301f87bba9241fd4777c6b25ad9a1b1268c00e8893175074a7392bc6c
SHA512

78c196c0aba6afc8426edfe013b889bca62e172d597b39e887dcd14aaa99bdcce8be65d4055722d34328c341b1c4b14107d0b8d5a6ff9e7f0afa5b29326675b1
SSDEEP

768:wl4dBTRz9hp3HWVWs9kjmbuapBax6GRUT0Ab9wswz1QB6Su7lvrJ/BB+H:wlkTyluaax/GAk9e1Qol7lV/f+H

Score

10^/10

silverrat defense_evasion execution persistence trojan

Malware Config

Extracted

Family

silverrat

Version

1.0.0.0

C2

172.221.202.55:3321

Mutex

SeroXen_OiKhOEOQVR

Attributes

certificate
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
decrypted_key
-|S.S.S|-
discord
https://discord.com/api/webhooks/1342686015311052902/PdErahk1LZkZhFWQDFrDTqA-2xQd7YhQGp43_V5ZuKJ-WS5Qrg7uXCnQmg8l14PxhzHB
key
yy6zDjAUmbB09pKvo5Hhug==
key_x509
b0FGeVZNcFRMWVloVHR6Z0VESU5RdlpZUmxZbUFE
payload_url
https://g.top4top.io/p_2522c7w8u1.png
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
1236	attrib.exe
1184	attrib.exe

Executes dropped EXE 1 IoCs

pid	Process
2144	$77xdwd.dll.exe

Loads dropped DLL 1 IoCs

pid	Process
2564	cmd.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\\Windows\\$77xdwd.dll.exe\""	SeroXen.exe

Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

Using powershell.exe command.

execution

PowerShell

T1059.001

pid	Process
1416	powershell.exe

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

Web Service

T1102

flow	ioc
4	discord.com
5	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

defense_evasion

pid	Process
2632	timeout.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 1 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence execution

Scheduled Task

T1053.005

pid	Process
2792	schtasks.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
2640	SeroXen.exe
2640	SeroXen.exe
2640	SeroXen.exe
1416	powershell.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	2640	SeroXen.exe
Token: SeDebugPrivilege	2144	$77xdwd.dll.exe
Token: SeDebugPrivilege	1416	powershell.exe

Suspicious use of WriteProcessMemory 27 IoCs

description	pid	Process	procid_target
PID 2640 wrote to memory of 1236	2640	SeroXen.exe	28
PID 2640 wrote to memory of 1236	2640	SeroXen.exe	28
PID 2640 wrote to memory of 1236	2640	SeroXen.exe	28
PID 2640 wrote to memory of 1184	2640	SeroXen.exe	30
PID 2640 wrote to memory of 1184	2640	SeroXen.exe	30
PID 2640 wrote to memory of 1184	2640	SeroXen.exe	30
PID 2640 wrote to memory of 2564	2640	SeroXen.exe	36
PID 2640 wrote to memory of 2564	2640	SeroXen.exe	36
PID 2640 wrote to memory of 2564	2640	SeroXen.exe	36
PID 2564 wrote to memory of 2632	2564	cmd.exe	38
PID 2564 wrote to memory of 2632	2564	cmd.exe	38
PID 2564 wrote to memory of 2632	2564	cmd.exe	38
PID 2564 wrote to memory of 2144	2564	cmd.exe	39
PID 2564 wrote to memory of 2144	2564	cmd.exe	39
PID 2564 wrote to memory of 2144	2564	cmd.exe	39
PID 2144 wrote to memory of 1384	2144	$77xdwd.dll.exe	40
PID 2144 wrote to memory of 1384	2144	$77xdwd.dll.exe	40
PID 2144 wrote to memory of 1384	2144	$77xdwd.dll.exe	40
PID 2144 wrote to memory of 2792	2144	$77xdwd.dll.exe	42
PID 2144 wrote to memory of 2792	2144	$77xdwd.dll.exe	42
PID 2144 wrote to memory of 2792	2144	$77xdwd.dll.exe	42
PID 2144 wrote to memory of 1216	2144	$77xdwd.dll.exe	44
PID 2144 wrote to memory of 1216	2144	$77xdwd.dll.exe	44
PID 2144 wrote to memory of 1216	2144	$77xdwd.dll.exe	44
PID 2144 wrote to memory of 1416	2144	$77xdwd.dll.exe	46
PID 2144 wrote to memory of 1416	2144	$77xdwd.dll.exe	46
PID 2144 wrote to memory of 1416	2144	$77xdwd.dll.exe	46

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

Views/modifies file attributes 1 TTPs 2 IoCs

defense_evasion

Hidden Files and Directories

T1564.001

pid	Process
1184	attrib.exe
1236	attrib.exe

C:\Users\Admin\AppData\Local\Temp\SeroXen.exe
"C:\Users\Admin\AppData\Local\Temp\SeroXen.exe"
1⤵
- Adds Run key to start application
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2640
- C:\Windows\System32\attrib.exe
  "C:\Windows\System32\attrib.exe" +s +h "C:\Users\Admin\Windows"
  2⤵
  - Sets file to hidden
  - Views/modifies file attributes
  PID:1236
- C:\Windows\System32\attrib.exe
  "C:\Windows\System32\attrib.exe" +s +h "C:\Users\Admin\Windows\$77xdwd.dll.exe"
  2⤵
  - Sets file to hidden
  - Views/modifies file attributes
  PID:1184
- C:\Windows\system32\cmd.exe
  cmd /c ""C:\Users\Admin\AppData\Local\Temp\tmpE38C.tmp.bat""
  2⤵
  - Loads dropped DLL
  - Suspicious use of WriteProcessMemory
  PID:2564
- - C:\Windows\system32\timeout.exe
    timeout 3
    3⤵
    - Delays execution with timeout.exe
    PID:2632
- - C:\Users\Admin\Windows\$77xdwd.dll.exe
    "C:\Users\Admin\Windows\$77xdwd.dll.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of WriteProcessMemory
    PID:2144
  - - C:\Windows\system32\schtasks.exe
      "schtasks.exe" /query /TN $77xdwd.dll.exe
      4⤵
      PID:1384
  - - C:\Windows\system32\schtasks.exe
      "schtasks.exe" /Create /SC ONCE /TN "$77xdwd.dll.exe" /TR "C:\Users\Admin\Windows\$77xdwd.dll.exe \"\$77xdwd.dll.exe\" /AsAdmin" /ST 00:01 /IT /F /RL HIGHEST
      4⤵
      Scheduled Task/Job: Scheduled Task
      PID:2792
  - - C:\Windows\system32\schtasks.exe
      "schtasks.exe" /query /TN $77xdwd.dll.exe
      4⤵
      PID:1216
  - - 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:1416

C:\Windows\explorer.exe
"C:\Windows\explorer.exe"
1⤵
PID:2476

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

Lateral Movement

Collection

Command and Control

Web Service

1

T1102

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\tmpE38C.tmp.bat

Filesize
147B

MD5
b4b5a4a5a5edcf8b80a76b861d02da3b

SHA1
b025343f44e92e75de09d6ee00d6a80fcd47d72e

SHA256
3b390eb5e67760a9574cba1197541753405f3a6961a3ecfeb66eda5642fe9599

SHA512
81fb948ee647d4d63e253fea915d9297db518c3064c47bbb360cab3c51836793c051b8b7e373fba656f8478b7c1c34cc958262179c492ecd9ac50621288a4f8c

Download Submit
\Users\Admin\Windows\$77xdwd.dll.exe

Filesize
44KB

MD5
7ec1d25ce5cd0afe104ee2e4389e4cf6

SHA1
fa31da5f424f7c106ff0701aab70f789cd4e445b

SHA256
fd8f6f8301f87bba9241fd4777c6b25ad9a1b1268c00e8893175074a7392bc6c

SHA512
78c196c0aba6afc8426edfe013b889bca62e172d597b39e887dcd14aaa99bdcce8be65d4055722d34328c341b1c4b14107d0b8d5a6ff9e7f0afa5b29326675b1

Download Submit
memory/1416-24-0x000000001B520000-0x000000001B802000-memory.dmp

Filesize
2.9MB

Download
memory/1416-25-0x0000000002A60000-0x0000000002A68000-memory.dmp

Filesize
32KB

Download
memory/2144-19-0x000000013F850000-0x000000013F860000-memory.dmp

Filesize
64KB

Download
memory/2640-0-0x000007FEF57D3000-0x000007FEF57D4000-memory.dmp

Filesize
4KB

Download
memory/2640-1-0x000000013FE90000-0x000000013FEA0000-memory.dmp

Filesize
64KB

Download
memory/2640-2-0x000007FEF57D0000-0x000007FEF61BC000-memory.dmp

Filesize
9.9MB

Download
memory/2640-3-0x000007FEF57D3000-0x000007FEF57D4000-memory.dmp

Filesize
4KB

Download
memory/2640-4-0x000007FEF57D0000-0x000007FEF61BC000-memory.dmp

Filesize
9.9MB

Download
memory/2640-14-0x000007FEF57D0000-0x000007FEF61BC000-memory.dmp

Filesize
9.9MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads