Rootkit.Win32.DOWNAD.A

December 02, 2024
 Analysis by: Raighen Sanchez
 ALIASES:

Trojan:WinNT/Conficker.B (MICROSOFT)

 PLATFORM:

Windows

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

  • Threat Type: Rootkit

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Downloaded from the Internet, Dropped by other malware

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

It does not have any propagation routine.

It does not have any information-stealing capability.

  TECHNICAL DETAILS

File Size:

4,096 bytes

File Type:

SYS

Memory Resident:

Yes

Initial Samples Received Date:

17 Mar 2024

Arrival Details

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

Propagation

This Rootkit does not have any propagation routine.

Information Theft

This Rootkit does not have any information-stealing capability.

Other Details

This Rootkit does the following:

  • It creates a symbolic link accessible to user-mode applications, enabling attackers to issue commands or control the driver directly.
  • It locates the driver tcpip.sys then modifies the driver to potentially alter network behavior or inject malicious code.
  • It minimizes activity by disconnecting the symbolic link and unloading its driver after its malicious usage.

It does not exploit any vulnerability.

  SOLUTION

Minimum Scan Engine:

9.800

FIRST VSAPI PATTERN FILE:

19.744.02

FIRST VSAPI PATTERN DATE:

28 Nov 2024

VSAPI OPR PATTERN File:

19.745.00

VSAPI OPR PATTERN Date:

29 Nov 2024

Step 1

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 2

Scan your computer with your Trend Micro product to delete files detected as Rootkit.Win32.DOWNAD.A. 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:


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