PUA.Win32.OfferInstall.G

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

It does not have any propagation routine.

It does not have any backdoor routine.

It connects to certain websites to send and receive information. However, as of this writing, the said sites are inaccessible.

Arrival Details

This Potentially Unwanted Application 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 Potentially Unwanted Application drops the following files:

• %User Temp%\is-{Random Characters}.tmp\{Malware Name}.tmp → deleted afterwards
• %User Temp%\is-{Random Characters}.tmp\file_.tmp → deleted afterwards
• %User Temp%\is-{Random Characters}.tmp\botva2.dll → deleted afterwards
• %User Temp%\is-{Random Characters}.tmp\Helper.dll → deleted afterwards
• %User Temp%\is-{Random Characters}.tmp\file_.exe

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)

It adds the following processes:

• "%User Temp\is-{Random Characters}.tmp\OFFERINSTALL.tmp" /SL5="$150588,832512,832512,{Malware Filename}"
• "%User Temp\is-{Random Characters}.tmp\file_.exe" /LANG=en /NA=Rh85hR64
• "%User Temp\is-{Random Characters}.tmp\file_.tmp" /SL5="$4305C6,1611420,832512,%User Temp%\is-{Random Characters}.tmp\file_.exe" /LANG=en /NA=Rh85hR64

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)

It creates the following folders:

• %User Temp%\is-{Random Characters}.tmp\_isetup

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)

Propagation

This Potentially Unwanted Application does not have any propagation routine.

Backdoor Routine

This Potentially Unwanted Application does not have any backdoor routine.

Rootkit Capabilities

This Potentially Unwanted Application does not have rootkit capabilities.

Other Details

This Potentially Unwanted Application connects to the following website to send and receive information:

• https://dy5wf71dvafjw.{BLOCKED}ront.net/installer/9483728320140705247/062028
• https://server-99-84-192-220.lax3.r.{BLOCKED}ront.net

It does the following:

• It opens a GUI prompting the user to choose one of the following languages for installation:
  • Čeština (Czech)
  • Dansk (Danish)
  • Deutsch (German)
  • English
  • Español (Spanish)
  • Français (French)
  • Italiano (Italian)
  • Nederlands (Dutch)
  • Norsk (Norwegian)
  • Polski (Polish)
  • Português Brasileiro (Brazilian Portuguese)
  • Suomi (Finnish)
  • Türkçe (Turkish)
  • Русский (Russian)
  
• It displays a GUI showing the progress of the installation:
  
• It displays the following message box if the malware fails to install:
  

However, as of this writing, the said sites are inaccessible.

It does not exploit any vulnerability.