PE_EXPIRO.AC

This file infector may arrive as an infected file.

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 creates an infection marker in infected files.

It connects to a website to send and receive information.

It modifies Internet Explorer security settings. This puts the affected computer at greater risk, as it allows malicious URLs to be accessed by the computer. It modifies the Internet Explorer Zone Settings.

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

Arrival Details

This file infector may arrive via network shares.

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

Installation

This file infector drops the following file(s)/component(s):

• %Application Data%\{Volume serial of system folder}{number}.nls - non-malicious

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

• kkq-vx-mtx{number}

File Infection

This file infector infects the following file types:

• .EXE

It infects the following file types in shared networks to ensure its propagation:

• .EXE

It 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 creates an infection marker in infected files.

Propagation

This file infector infects files of the following file type(s) in network shares, ensuring its propagation across the network:

• .EXE

Backdoor Routine

This file infector opens the following ports:

• TCP Port 2000
• TCP Port 2068

It connects to the following websites to send and receive information:

• {BLOCKED}vsah-ebe.com
• {BLOCKED}u-liwup.org
• {BLOCKED}robybi.ru
• {BLOCKED}wi-uhexy.ru
• {BLOCKED}dyjemi.in
• {BLOCKED}urtepbiwa.org
• {BLOCKED}ajjebyto.com
• {BLOCKED}-oxona.biz
• {BLOCKED}hediso.cc
• {BLOCKED}jesi-ifo.ws
• {BLOCKED}u-uwy.cc
• {BLOCKED}fnikuxy.ru
• {BLOCKED}emyzy.cc
• {BLOCKED}ahezy.ru
• {BLOCKED}oxanvy.org
• {BLOCKED}syxuvnok.cc
• {BLOCKED}de-mu.org
• {BLOCKED}nuqivetac.ru
• {BLOCKED}nnitcyli.ru
• {BLOCKED}eveqefuc.com
• {BLOCKED}i-eji.ws
• {BLOCKED}arlu-woqhab.net

Web Browser Home Page and Search Page Modification

This file infector modifies Internet Explorer zone settings.

It modifies the Internet Explorer Zone Settings.

Information Theft

This file infector steals the following information:

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

Stolen Information

This file infector saves the stolen information in the following file:

• %Application Data%\kf{random number}z32.dl
• %Application Data%\dfl{random number}z32.dll
• %Application Data%\wsr{random number}zt32.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.)

NOTES:

It infects files executable files with .EXE extensions and files referenced by shortcut (.LNK) files, starting in the Start Menu Programs directory then passes through the directory until it reaches the %Desktop% folder.

Since it infects Start up programs, it serves as its auto-start mechanism.

It also infects .EXE files found in removable drives.

It searches drives from C:\ to Z:\ and infects all found .EXE files. Thus, the drives shared through the network will be infected.