Trojan.Win32.REDOSDRU.R06CC0DK922


 ALIASES:

Trojan:Win32/Redosdru.W (MICROSOFT)

 PLATFORM:

Windows

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:
 INFORMATION EXPOSURE:

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Downloaded from the Internet, Dropped by other malware

This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

  TECHNICAL DETAILS

File Size:

147,968 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

17 Nov 2022

Payload:

Modifies system registry, Drops files

Arrival Details

This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Installation

This Trojan adds the following processes:

  • netsh ipsec static add policy name=Block
  • netsh ipsec static add filterlist name=Filter1
  • netsh ipsec static add filter filterlist=Filter1 srcaddr=any dstaddr=Me dstport=135 protocol=TCP
  • netsh ipsec static add filter filterlist=Filter1 srcaddr=any dstaddr=Me dstport=135 protocol=UDP
  • netsh ipsec static add filter filterlist=Filter1 srcaddr=any dstaddr=Me dstport=139 protocol=TCP
  • netsh ipsec static add filter filterlist=Filter1 srcaddr=any dstaddr=Me dstport=139 protocol=UDP
  • netsh ipsec static add filter filterlist=Filter1 srcaddr=any dstaddr=Me dstport=445 protocol=TCP
  • netsh ipsec static add filter filterlist=Filter1 srcaddr=any dstaddr=Me dstport=445 protocol=UDP
  • netsh ipsec static add filteraction name=FilteraAtion1 action=block
  • netsh ipsec static add rule name=Rule1 policy=Block filterlist=Filter1 filteraction=FilteraAtion1
  • netsh ipsec static set policy name=Block assign=y

Other System Modifications

This Trojan adds the following registry entries:

HKEY_LOCAL_MACHINE\SYSTeM\ControlSet001\
Control\Print\Monitors\
RunDllexe
Driver = %Windows%\Logs\RunDllexe.dll

HKEY_LOCAL_MACHINE\SYSTeM\ControlSet001\
services\Spooler
RequiredPrivileges = SeTcbPrivilege, SeImpersonatePrivilege, SeAuditPrivilege, SeChangeNotifyPrivilege, SeAssignPrimaryTokenPrivilege, SeLoadDriverPrivilege, SeShutdownPrivilege

HKEY_LOCAL_MACHINE\SOFTWARe\Policies\
Microsoft\Windows Defender
DisableAntiSpyware = 1

HKEY_LOCAL_MACHINE\SYSTeM\ControlSet001\
services\IPSec
OperationMode = 3

Dropping Routine

This Trojan drops the following files:

  • %Windows%\Logs\RunDllexe.dll

(Note: %Windows% is the Windows folder, where it usually is C:\Windows on all Windows operating system versions.)

Other Details

This Trojan adds the following registry keys:

HKEY_LOCAL_MACHINE\SYSTeM\ControlSet001\
Control\Print\Monitors\
RunDllexe

HKEY_LOCAL_MACHINE\SOFTWARe\Policies\
Microsoft\Windows Defender

HKEY_LOCAL_MACHINE\SYSTeM\ControlSet001\
services\IPSec

HKEY_LOCAL_MACHINE\SOFTWARe\Policies\
Microsoft\Windows\IPSec\
Policy\Local\ipsecISAKMPPolicy{672781c6-7465-4ac1-bcaa-e46cba9af8cd}

HKEY_LOCAL_MACHINE\SOFTWARe\Policies\
Microsoft\Windows\IPSec\
Policy\Local\ipsecNegotiationPolicy{b5ca1cd5-5962-406e-bdbd-e783cb6d6c01}

HKEY_LOCAL_MACHINE\SOFTWARe\Policies\
Microsoft\Windows\IPSec\
Policy\Local\ipsecPolicy{1b16bd2e-1223-407a-9114-3b1bc29d56bf}

HKEY_LOCAL_MACHINE\SOFTWARe\Policies\
Microsoft\Windows\IPSec\
Policy\Local\ipsecNFA{3f236750-ca85-49cd-ae64-6c08811fa501}

HKEY_LOCAL_MACHINE\SOFTWARe\Policies\
Microsoft\Windows\IPSec\
Policy\Local\ipsecFilter{df7a0791-2ab6-4b97-8fcd-2150833f79b8}

HKEY_LOCAL_MACHINE\SOFTWARe\Policies\
Microsoft\Windows\IPSec\
Policy\Local\ipsecNegotiationPolicy{64b27596-41ab-454b-b883-a1581a22f083}

HKEY_LOCAL_MACHINE\SOFTWARe\Policies\
Microsoft\Windows\IPSec\
Policy\Local\ipsecNFA{986b98eb-f87e-478d-ae29-ca3155b908fc}

  SOLUTION

Minimum Scan Engine:

9.800

FIRST VSAPI PATTERN FILE:

17.954.01

FIRST VSAPI PATTERN DATE:

23 Nov 2022

VSAPI OPR PATTERN File:

17.955.00

VSAPI OPR PATTERN Date:

24 Nov 2022

Step 1

Trend Micro Predictive Machine Learning detects and blocks malware at the first sign of its existence, before it executes on your system. When enabled, your Trend Micro product detects this malware under the following machine learning name:

     
    • TROJ.Win32.TRX.XXPE50FFF065

Step 2

Before doing any scans, Windows 7, Windows 8, Windows 8.1, and Windows 10 users must disable System Restore to allow full scanning of their computers.

Step 3

Note that not all files, folders, and registry keys and entries are installed on your computer during this malware's/spyware's/grayware's execution. This may be due to incomplete installation or other operating system conditions. If you do not find the same files/folders/registry information, please proceed to the next step.

Step 4

Delete this registry value

[ Learn More ]

Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.

  • In HKEY_LOCAL_MACHINE\SYSTeM\ControlSet001\Control\Print\Monitors\RunDllexe
    • Driver = %Windows%\Logs\RunDllexe.dll
  • In HKEY_LOCAL_MACHINE\SYSTeM\ControlSet001\services\Spooler
    • RequiredPrivileges = SeTcbPrivilege, SeImpersonatePrivilege, SeAuditPrivilege, SeChangeNotifyPrivilege, SeAssignPrimaryTokenPrivilege, SeLoadDriverPrivilege, SeShutdownPrivilege
  • In HKEY_LOCAL_MACHINE\SOFTWARe\Policies\Microsoft\Windows Defender
    • DisableAntiSpyware = 1
  • In HKEY_LOCAL_MACHINE\SYSTeM\ControlSet001\services\IPSec
    • OperationMode = 3

Step 5

Delete this registry key

[ Learn More ]

Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.

  • In HKEY_LOCAL_MACHINE\SYSTeM\ControlSet001\Control\Print\Monitors\RunDllexe
  • In HKEY_LOCAL_MACHINE\SOFTWARe\Policies\Microsoft\Windows Defender
  • In HKEY_LOCAL_MACHINE\SOFTWARe\Policies\Microsoft\Windows\IPSec\Policy\Local\ipsecISAKMPPolicy{672781c6-7465-4ac1-bcaa-e46cba9af8cd}
  • In HKEY_LOCAL_MACHINE\SOFTWARe\Policies\Microsoft\Windows\IPSec\Policy\Local\ipsecNegotiationPolicy{b5ca1cd5-5962-406e-bdbd-e783cb6d6c01}
  • In HKEY_LOCAL_MACHINE\SOFTWARe\Policies\Microsoft\Windows\IPSec\Policy\Local\ipsecPolicy{1b16bd2e-1223-407a-9114-3b1bc29d56bf}
  • In HKEY_LOCAL_MACHINE\SOFTWARe\Policies\Microsoft\Windows\IPSec\Policy\Local\ipsecNFA{3f236750-ca85-49cd-ae64-6c08811fa501}
  • In HKEY_LOCAL_MACHINE\SOFTWARe\Policies\Microsoft\Windows\IPSec\Policy\Local\ipsecFilter{df7a0791-2ab6-4b97-8fcd-2150833f79b8}
  • In HKEY_LOCAL_MACHINE\SOFTWARe\Policies\Microsoft\Windows\IPSec\Policy\Local\ipsecNegotiationPolicy{64b27596-41ab-454b-b883-a1581a22f083}
  • In HKEY_LOCAL_MACHINE\SOFTWARe\Policies\Microsoft\Windows\IPSec\Policy\Local\ipsecNFA{986b98eb-f87e-478d-ae29-ca3155b908fc}
  • In HKEY_LOCAL_MACHINE\SYSTeM\ControlSet001\services\IPSec

Step 6

Search and delete this file

[ Learn More ]
There may be some files that are hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the "More advanced options" option to include all hidden files and folders in the search result.
    • %Windows%\Logs\RunDllexe.dll

Step 7

Scan your computer with your Trend Micro product to delete files detected as Trojan.Win32.REDOSDRU.R06CC0DK922. If the detected files have already been cleaned, deleted, or quarantined by your Trend Micro product, no further step is required. You may opt to simply delete the quarantined files. Please check the following Trend Micro Support pages for more information:


Did this description help? Tell us how we did.