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Backdoor.Win32.ZEGOST.ANP

April 08, 2020
 PLATFORM:

Windows

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

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW


This Backdoor 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:

336,064 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

08 Apr 2020

Arrival Details

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

Autostart Technique

This Backdoor adds the following registry entries to enable its automatic execution at every system startup:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
Ball = "%Windows%\Ball.exe"

Dropping Routine

This Backdoor drops the following files:

  • %Windows%\Temp\zk.exe
  • %System Root%\Documents and Settings\All Users\xef\xbe\xa1\xef\xbe\xb8\xef\xbe\xbf\xef\xbe\xaa\xef\xbf\x8a\xef\xbe\xbc\xef\xbe\xa1\xef\xbe\xb9\xef\xbe\xb2\xef\xbf\x8b\xef\xbe\xb5\xef\xbe\xa5\xef\xbe\xb3\xef\xbf\x8c\xef\xbf\x90\xef\xbf\xb2\xef\xbf\x86\xef\xbf\xb4\xef\xbe\xb6\xef\xbe\xaf\Ball.exe
  • %System Root%\Documents and Settings\All Users\xc2\xa1\xc2\xb8\xc2\xbf\xc2\xaa\xc3\x8a\xc2\xbc\xc2\xa1\xc2\xb9\xc2\xb2\xc3\x8b\xc2\xb5\xc2\xa5\xc2\xb3\xc3\x8c\xc3\x90\xc3\xb2\xc3\x86\xc3\xb4\xc2\xb6\xc2\xaf\Ball.exe
  • %Windows%\Ball.exe
  • %System Root%\Documents and Settings\All Users\Start Menu\Programs\Startup\Ball.exe

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

Other Details

This Backdoor connects to the following possibly malicious URL:

  • {BLOCKED}.21.112

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine:

9.850

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

Restart in Safe Mode

[ Learn More ]

Step 3

Delete this registry value

[ Learn More ]

Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.

  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
    • Ball = "%Windows%\Ball.exe"

Step 4

Search and delete these components

[ Learn More ]
There may be some components 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.
  • %Windows%\Temp\zk.exe
  • %System Root%\Documents and Settings\All Users\xef\xbe\xa1\xef\xbe\xb8\xef\xbe\xbf\xef\xbe\xaa\xef\xbf\x8a\xef\xbe\xbc\xef\xbe\xa1\xef\xbe\xb9\xef\xbe\xb2\xef\xbf\x8b\xef\xbe\xb5\xef\xbe\xa5\xef\xbe\xb3\xef\xbf\x8c\xef\xbf\x90\xef\xbf\xb2\xef\xbf\x86\xef\xbf\xb4\xef\xbe\xb6\xef\xbe\xaf\Ball.exe
  • %System Root%\Documents and Settings\All Users\xc2\xa1\xc2\xb8\xc2\xbf\xc2\xaa\xc3\x8a\xc2\xbc\xc2\xa1\xc2\xb9\xc2\xb2\xc3\x8b\xc2\xb5\xc2\xa5\xc2\xb3\xc3\x8c\xc3\x90\xc3\xb2\xc3\x86\xc3\xb4\xc2\xb6\xc2\xaf\Ball.exe
  • %Windows%\Ball.exe
  • %System Root%\Documents and Settings\All Users\Start Menu\Programs\Startup\Ball.exe

Step 5

Restart in normal mode and scan your computer with your Trend Micro product for files detected as Backdoor.Win32.ZEGOST.ANP. 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 this Knowledge Base page for more information.


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