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PE_EXPIRO.JX-O
Aliases: Trojan:Win32/Meredrop (Microsoft); W32.Xpiro.D (Symantec)
Malware type: File infector
Destructive: No
Platform: Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)
Encrypted: Yes
In the wild: Yes

Overview


Infection Channel: Downloaded from the Internet, Dropped by other malware, Infects files

This file infector arrives via malicious Java applet. Once it infects a system, it seeks out executable files in all available drives, making it easy to propagate especially to other computers that are sharing folders over a network.

To get a one-glance comprehensive view of the behavior of this File infector, refer to the Threat Diagram shown below.

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 may be downloaded from remote sites by other malware.

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: 547,328 bytes
File type: EXE
Memory resident: Yes
Initial samples received date: 05 Jul 2013
Payload: Steals 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.

It may be downloaded from remote site(s) by the following malware:

  • JAVA_EXPLOIT.ZC
  • TROJ_PIDIEF.JXM

Installation

This file infector adds the following mutexes to ensure that only one of its copies runs at any one time:

  • kkq-vx-mtx{random-number}

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:

  • {folder where malware is installed}
  • %Start Menu%
  • All available drives

(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%\wsr18zt32.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:

  • {BLOCKED}romarenda.ru
  • {BLOCKED}on-oriental.ru
  • {BLOCKED}na-rukave.org
  • {BLOCKED}izneonet.biz
  • {BLOCKED}etails555.biz
  • {BLOCKED}-govsvc.ru
  • {BLOCKED}ydyg.ru
  • {BLOCKED}ugin.com
  • {BLOCKED}ikav.com
  • {BLOCKED}aquh.ru
  • {BLOCKED}etop.com
  • {BLOCKED}outhoffshore.com
  • {BLOCKED}latker.ru
  • {BLOCKED}job.ru
  • {BLOCKED}gunszavod.ru
  • {BLOCKED}vostok.ws
  • {BLOCKED}op-ultras.org
  • {BLOCKED}kygay-formula.in
  • {BLOCKED}xxlub.ru
  • {BLOCKED}adshop.ru
  • {BLOCKED}rtal-2016.ru
  • {BLOCKED}rc-usb33bit.com
  • {BLOCKED}ers50.ru
  • {BLOCKED}ka-ww2.ru
  • {BLOCKED}-beavis.ru
  • {BLOCKED}-from-iran.net
  • {BLOCKED}ur.ru
  • {BLOCKED}llusionist.com
  • {BLOCKED}llusionist.net
  • www.{BLOCKED}vrc-usb33bit.com

NOTES:

This file infector installs Mozilla Firefox and Google Chrome add-ons/extensions to monitor browser activity and redirect users to the following URLs:

  • {BLOCKED}illusionist.net
  • {BLOCKED}ortal-2016.ru
  • {BLOCKED}hop-ultras.org
  • {BLOCKED}n-from-iran.net
  • {BLOCKED}a-govsvc.ru
  • {BLOCKED}-gunszavod.ru
  • {BLOCKED}bizneonet.biz
  • {BLOCKED}-job.ru
  • {BLOCKED}mers50.ru
  • {BLOCKED}retails555.biz
  • {BLOCKED}sur.ru
  • {BLOCKED}-na-rukave.org
  • {BLOCKED}ron-oriental.ru

Solution


Minimum scan engine: 9.300
VSAPI OPR Pattern Version: 10.143.00
VSAPI OPR Pattern Release Date: 08 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

Remove malware/grayware files that dropped/downloaded PE_EXPIRO.JX-O

Step 3

Remove the malware/grayware file dropped/downloaded by PE_EXPIRO.JX-O

Step 4

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%\wsr28zt32.dll

Step 5

Scan your computer with your Trend Micro product to delete files detected as PE_EXPIRO.JX-O. 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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