Analysis by: Melvin Jhun Palbusa

ALIASES:

RiskTool.Win64.WinExec.gen (KASPERSKY)

 PLATFORM:

Windows

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

  • Threat Type: Hacking Tool

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

Canal de infección Downloaded from the Internet, Dropped by other malware

This Hacking Tool 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

Tamaño del archivo 27,648 bytes
Tipo de archivo EXE
Residente en memoria No
Fecha de recepción de las muestras iniciales 12 Apr 2023
Carga útil Drops files

Arrival Details

This Hacking Tool 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 Hacking Tool drops the following files:

  • %System Root%\winexesvc.log → contains log activities of the hack tool

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

Other Details

This Hacking Tool does the following:

  • It checks for the service:
    • Service name: winexesvc
  • It creates the following pipe and connects to the following pipe names which allow command execution:
    • \.\pipe\ahexec_stdin
    • \.\pipe\ahexec_stdout
    • \.\pipe\ahexec_stderr
    • \.\pipe\ahexec
  • It does the following set of commands:
    • run(execute set of commands)
      • Log-on User
      • Open and Duplicate Process Token
      • Open Thread Token
      • Revert to Self (Terminate impersonation)
    • Get:(Fetch commands)
      • system(System information)
      • implevel(Impersonate Name Pipe Client)
      • profile(User Profile)
      • runas(Runas Credentials)
    • Set:(Set information to itself)
      • Version(Retrieve Hacking tool's Version)
      • codepage(Update codes to itself)
  • After connection is established, this hack tool will be able to create processes remotely

  SOLUTION

Motor de exploración mínimo 9.800
Archivo de patrones de SSAPI: 2.615.00

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

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.  winexesvc.log

Step 3

Scan your computer with your Trend Micro product to delete files detected as HackTool.Win64.WinExe.AF. 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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