Analysis by: Roland Marco Dela Paz
ALIASES:

Backdoor.Win32.Shiz.asi (Kaspersky); W32/Bamital.dll (McAfee)

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

This backdoor may be dropped by other malware.

It deletes registry entries, causing some applications and programs to not function properly.

It connects to a website to send and receive information.

  TECHNICAL DETAILS

File Size: Varies
File Type: PE
Initial Samples Received Date: 21 Jan 2011

Arrival Details

This backdoor may be dropped by the following malware:

  • TROJ_BAMITAL.QUE

Installation

This backdoor injects itself into the following processes running in the affected system's memory:

  • fchrome.exe
  • firefox.exe
  • opera.exe
  • iexplore.exe

It is injected into the following processes running in memory:

  • explorer.exe

Other System Modifications

This backdoor deletes the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\SystemRestore
DisableSR = 0

Backdoor Routine

This backdoor connects to the following websites to send and receive information:

  • C90D9B1BEF95278A0157B7E25350B6EC.info
  • 56A21C00E797ED646F427537D6C05D6B.info

  SOLUTION

Minimum Scan Engine: 8.900
VSAPI PATTERN File: 7.780.15
VSAPI PATTERN Date: 21 Jan 2011
VSAPI PATTERN Date: 1/21/2011 12:00:00 AM

Step 1

For Windows XP and Windows Server 2003 users, before doing any scans, please make sure you disable System Restore to allow full scanning of your computer.

Step 2

Remove malware files dropped/downloaded by BKDR_SHIZ.AB

    • TROJ_BAMITAL.QUE

Step 3

Scan your computer with your Trend Micro product and note files detected as BKDR_SHIZ.AB

Step 4

Restart in Safe Mode

[ Learn More ]

Step 5

Restore this file from backup only Microsoft-related files will be restored. If this malware/grayware also deleted files related to programs that are not from Microsoft, please reinstall those programs on you computer again.

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\SystemRestore
DisableSR = 0

Step 6

Search and delete the file detected as BKDR_SHIZ.AB

[ Learn More ]
Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden files in the search result.


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