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Rootkit.Win32.QASSIST.A

September 07, 2019
 Analysis by: Arvin Roi Macaraeg
 ALIASES:

N/A

 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:

Dropped by other malware, Downloaded from the Internet


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 may be dropped by other malware.

  TECHNICAL DETAILS

File Size:

63,048 bytes

File Type:

SYS

Memory Resident:

Yes

Initial Samples Received Date:

06 Sep 2019

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.

It may be dropped by the following malware:

Other Details

This Rootkit does the following:

  • It installs/uninstalls commands through a driver.
  • It sets a specific connection gate name having a default name "HiddenGate."
  • It can execute commands from the following:
    • Single Line
    • Multiple Line
    • Config file
  • It can enable/disable the hidden option.
  • It can query the state of a file/registry to see if it is hidden or not.
  • It can hide/unhide the following:
    • File
    • Directory
    • Registry Key
    • Registry Value
  • It removes the rule which allows the viewing of hidden system files or registry keys.
  • It can turn on/off to access hidden system files or registry keys for a specific process ID.
  • It can set/remove/query a process for its process protection.
  • It can set a parent process to inherit its ability to its child process.
  • It can set if the following policies can be applied to all of the active processes or to a new process only.

  SOLUTION

Minimum Scan Engine:

9.850

FIRST VSAPI PATTERN FILE:

15.350.01

FIRST VSAPI PATTERN DATE:

06 Sep 2019

VSAPI OPR PATTERN File:

15.351.00

VSAPI OPR PATTERN Date:

07 Sep 2019

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

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 3

Scan your computer with your Trend Micro product to delete files detected as Rootkit.Win32.QASSIST.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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