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PUA.Win32.AntiRevoke.A

January 30, 2020
 Analysis by: Alyssa Christelle Ramos
 ALIASES:

Trojan.Win32.CredentialAccess(IKARUS);Trojan:Win32/CredentialAccess!rfn(MICROSOFT)

 PLATFORM:

Windows

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

  • Threat Type: Potentially Unwanted Application

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Downloaded from the Internet, Dropped by other malware

This Potentially Unwanted Application 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 backdoor routine.

It does not have any information-stealing capability.

This is the Trend Micro detection for files that exhibit certain behaviors.

  TECHNICAL DETAILS

File Size:

218,624 bytes

File Type:

DLL

Initial Samples Received Date:

05 Dec 2019

Payload:

Intercept and patch revocation message

Arrival Details

This Potentially Unwanted Application 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 Potentially Unwanted Application does not have any propagation routine.

Backdoor Routine

This Potentially Unwanted Application does not have any backdoor routine.

Information Theft

This Potentially Unwanted Application does not have any information-stealing capability.

Other Details

This is the Trend Micro detection for:

  • Possibly unwanted plug-in modules of the WeChat application

It does the following:

  • It is a third-party module used to intercept and patch revocation message from WeChat.
  • It requires to be loaded by the WeChat application to perform its intended routine.

  SOLUTION

Minimum Scan Engine:

9.850

SSAPI PATTERN File:

2.255.00

SSAPI PATTERN Date:

30 Jan 2020

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.XXPE50FFF034

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

Scan your computer with your Trend Micro product to delete files detected as PUA.Win32.AntiRevoke.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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