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HackTool.Win64.WinExec.AC

April 18, 2019
 Analysis by: Noel Anthony Llimos
 ALIASES:

HEUR:RiskTool.Win64.WinExec.gen (Kaspersky)

 PLATFORM:

Windows

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

  • Threat Type: Hacking Tool

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

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

File Size:

22,528 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

15 Apr 2019

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.

Other Details

This Hacking Tool does the following:

  • It checks for the following service name if present in the system:
    • Service name: winexesvc
  • It has the following set of commands:
    • run (Execute)
    • get (Fetch Command or File)
    • set (Modify Settings/Configuration)
    • runas (Run Under a Different User Account)
    • implevel (Impersonate Name Pipe Client)
    • Log-on User
    • Revert to Self (Terminate Impersonation)
    • Open and Duplicate Token for the following:
      • Process
      • Threads
    • After connection is established, this hack tool will be able to Create Processes remotely.
    • It uses the following arguments to get information:
      • version (Get the hacking tool's version)
      • system (System information)
    • This hacking tool create and connects to the following pipe names which allow remote command execution:
      • \.\pipe\ahexec_stdio
      • \.\pipe\ahexec_stderr
      • \.\pipe\ahexec

  SOLUTION

Minimum Scan Engine:

9.850

SSAPI PATTERN File:

2.169.00

SSAPI PATTERN Date:

17 Apr 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

Identify and terminate files detected as HackTool.Win64.WinExec.AC

[ Learn More ]
  1. Windows Task Manager may not display all running processes. In this case, please use a third-party process viewer, preferably Process Explorer, to terminate the malware/grayware/spyware file. You may download the said tool here.
  2. If the detected file is displayed in either Windows Task Manager or Process Explorer but you cannot delete it, restart your computer in safe mode. To do this, refer to this link for the complete steps.
  3. If the detected file is not displayed in either Windows Task Manager or Process Explorer, continue doing the next steps.

Step 4

Scan your computer with your Trend Micro product to delete files detected as HackTool.Win64.WinExec.AC. 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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