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PE64_EXPIRO.JX

January 29, 2014
 Analysis by: Rhena Inocencio
 ALIASES:

Win64/Expiro.A virus (NOD32), W64/Expiro !! (McAfee)

 PLATFORM:

Windows XP (64-bit), Windows Vista (64-bit), Windows 7 (64-bit)

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

  • Threat Type: File infector

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Downloaded from the Internet, Dropped by other malware


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

It infects files by overwriting code in the entry point and saving the overwritten code in the virus body. It then appends the virus body to the host file.

It steals certain information from the system and/or the user.

  TECHNICAL DETAILS

File Size:

Varies

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

09 Jul 2013

Payload:

Steals information, Collects system information, Connects to URLs/IPs

Arrival Details

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

File Infection

This file infector overwrites code found in the entry point of a target file. It then appends the virus body to the target file. The overwritten code is saved in the virus body.

It searches for target files in the following folders:

  • Current Directory
  • %Start Menu%
  • All available drive

(Note: %Start Menu% is the current user's Start Menu folder, which is usually C:\Windows\Start Menu or C:\Documents and Settings\{User name}\Start Menu on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming\Microsoft\Windows\Start Menu on Windows Vista and 7.)

Information Theft

This file infector steals the following information:

  • Windows Product ID
  • Drive Volume Serial Number
  • OS Version
  • User credentials
  • FileZilla Information

Stolen Information

The stolen information is saved in the following file:

  • %Application Data%\{random filename}.dll

(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming on Windows Vista and 7.)

It sends the gathered information via HTTP POST to the following URL:

  • www.{BLOCKED}vrc-usb33bit.Com
  • www.{BLOCKED}skygay-formula.in
  • www.{BLOCKED}-vostok.ws
  • {BLOCKED}illusionist.net
  • {BLOCKED}illusionist.com
  • {BLOCKED}ed.ru
  • {BLOCKED}sur.ru
  • {BLOCKED}n-from-iran.net
  • {BLOCKED}p-beavis.ru
  • {BLOCKED}dka-ww2.ru
  • {BLOCKED}mers50.ru
  • {BLOCKED}festores.cc
  • {BLOCKED}rc-usb33bit.com
  • {BLOCKED}ortal-2016.ru
  • {BLOCKED}e-policy2011.ru
  • {BLOCKED}eadshop.ru
  • {BLOCKED}bank.ru
  • {BLOCKED}axxlub.ru
  • {BLOCKED}skygay-formula.in
  • {BLOCKED}hop-ultras.org
  • {BLOCKED}-vostok.ws
  • {BLOCKED}-gunszavod.ru
  • {BLOCKED}-job.ru
  • {BLOCKED}platker.ru
  • {BLOCKED}southoffshore.com
  • {BLOCKED}-efal.ru
  • {BLOCKED}a-govsvc.ru
  • {BLOCKED}retails555.biz
  • {BLOCKED}bizneonet.biz
  • {BLOCKED}-na-rukave.org
  • {BLOCKED}ron-oriental.ru
  • {BLOCKED}romarenda.ru

NOTES:

This infector creates {host file name}.vir, which contains the infected copy of the target file. Afterwards, it attempts to overwrite the target file and later deletes the created *.vir file.

  SOLUTION

Minimum Scan Engine:

9.300

FIRST VSAPI PATTERN FILE:

10.150.02

FIRST VSAPI PATTERN DATE:

12 Jul 2013

VSAPI OPR PATTERN File:

10.151.00

VSAPI OPR PATTERN Date:

13 Jul 2013

Step 1

Before doing any scans, Windows XP, Windows Vista, and Windows 7 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.  
  • %Application Data%\{random filename}.dll

Step 3

Scan your computer with your Trend Micro product to clean files detected as PE64_EXPIRO.JX. 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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