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WORM_ORBINA.AB

October 09, 2012
 Analysis by: Kathleen Notario
 ALIASES:

W32.SillyFDC (Symantec); Worm:Win32/Orbina!rts (Microsoft); Trojan.Win32.Zapchast.qkp (Kaspersky); BackDoor-CVZ (Mcafee)

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Worm

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

This worm 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:

36,864 bytes

Memory Resident:

No

Initial Samples Received Date:

28 Jul 2011

Arrival Details

This worm 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 worm requires the existence of the following files to properly run:

  • %Current%\autorun.inf
  • %Current%\readme.htm

NOTES:

It retrieves the default browser of the affected system by querying the default value of the following registry key:

HKEY_CLASSES_ROOT\http\shell\open\command

It retrieves string values from the following file:

  • %Current%\autorun.inf

It executes the following:

  • It opens the file "%Current%\readme.htm" using the default browser

  SOLUTION

Minimum Scan Engine:

8.900

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

Scan your computer with your Trend Micro product to delete files detected as WORM_ORBINA.AB . 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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