BAT_QHOST.MJSN

April 06, 2016
 Analysis by: Rhena Inocencio
 ALIASES:

Trojan.BAT.Qhost.adi (Kaspersky)

 PLATFORM:

Windows

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

  • Threat Type: Worm

  • Destructiveness: No

  • Encrypted:

  • 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:

1,904 bytes

File Type:

BAT

Initial Samples Received Date:

31 Mar 2016

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.

Installation

This worm drops the following copies of itself into the affected system and executes them:

  • %Application Data%\love_killer.bat

(Note: %Application Data% is the Application Data folder, where it usually is C:\Documents and Settings\{user name}\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Roaming on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)

It drops the following files:

  • %Application Data%\set.bat
  • %Start Menu%\Programs\startup\explorer.vbs
  • %Application Data%\registery.reg

(Note: %Application Data% is the Application Data folder, where it usually is C:\Documents and Settings\{user name}\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Roaming on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.. %Start Menu% is the Start Menu folder, where it usually is C:\Documents and Settings\{user name}\Start Menu on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Roaming\Microsoft\Windows\Start Menu on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)

Other System Modifications

This worm adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Policies\
System
EnableLUA = "0"

Propagation

This worm drops copies of itself in the following drives:

  • {Drive C: to V:}\love_killer.bat

HOSTS File Modification

This worm modifies the system's HOSTS files to redirect users once the following Web site(s) are accessed:

  • facebook.com
  • google.com
  • google.co.in

It adds the following strings to the Windows HOSTS file:

  • {BLOCKED}.{BLOCKED}.180.72 facebook.com
  • {BLOCKED}.{BLOCKED}.180.72 www.facebook.com
  • {BLOCKED}.{BLOCKED}.35.230 google.com
  • {BLOCKED}.{BLOCKED}.35.230 www.google.com
  • {BLOCKED}.{BLOCKED}.98.132 google.co.in
  • {BLOCKED}.{BLOCKED}.98.132 www.google.co.in