McAfee > Theat Center > Virus Detail Page

Overview

This is a trojan detection. Unlike viruses, trojans do not self-replicate. They are spread manually, often under the premise that they are beneficial or wanted. The most common installation methods involve system or security exploitation, and unsuspecting users manually executing unknown programs. Distribution channels include email, malicious or hacked web pages, Internet Relay Chat (IRC), peer-to-peer networks, etc.

Characteristics

This is Trojan detection for a Bredolab variant. 

When executed, this malware drops the following files:

• %UserDirectory%\qbothome\_qbotinj.exe
• %UserDirectory%\qbothome\_qbotnti.exe
• %UserDirectory%\qbothome\_qbot.dll
• %UserDirectory%\Start Menu\Programs\Startup\startup.bat
• %Root%\Tasks\*.job

(Where %UserDirectory% is the name of a user's home directory and %Root% is the root directory such as C:\)

 

Once the file is installed on a compromised machine, it will be owned by a domain admin account. Once the domain admin account is compromised the malware binary infects all other machines in the network by “Network Shares”. In most cases, the compromised machine will have the “admin$” and “C$” network shares on all the workstations and a compromised domain admin account.

Note : [‘$’ stands for network sharing]

By default, windows stores a local password hash for every cached login. Once a domain admin account is compromised, one has to assume that ALL passwords are now known for the entire network to the attacker. This worm also monitors keystrokes, which is easier than reversing the hashes to know the password of the compromised user to the attacker. 

 

The malware may also attempt to download the following files:

• q2l.exe
• iedw.exe
• si.txt
• seclog.txt
• _qbotnti.exe
• _qbotinj.exe
• nbl.txt
• removeme.txt
• irclog.txt

The following registry entry is created to allow itself to run at startup:

• Hkey_Local_Machine\Software\Microsoft\Windows\CurrentVersion\Run
        {Original Value} = "%UserDirectory%\qbothome\_qbotinj.exe"
      "%UserDirectory%\qbothome\_qbot.dll" /c {Original Data}

Connections may be made with the following domains:

• hxxp://www.cdcdcdcdc2121cdsfdfd.com
• hxxp://nt202.cn
• hxxp://nt010.cn
• hxxp://nt002.cn
• hxxp://up002.cn
• hxxp://adserv.co.in
• hxxp://zurnretail.com/cgi-bin/clientinfo3.pl
• hxxp://hostrmeter.com
• hxxp://hotbar.com

Symptoms

• Presence of aforementioned files and registry entries.
• Presence of unexpected network connections.

Method of Infection

Trojans are not viruses, and as such do not contain any method to replicate by themselves. However they may be downloaded by other viruses and/or Trojans to be installed on the user's system. Alternatively they may be installed by visiting a malicious web page (either by clicking on a link, or by the website hosting a scripted exploit which installs the malwares).

Removal

All Users:
Use current engine and DAT files for detection and removal.

Modifications made to the system Registry and/or INI files for the purposes of hooking system startup, will be successfully removed if cleaning with the recommended engine and DAT combination (or higher).

Additional Windows ME/XP removal considerations

Variants

Variants

N/A

All Information

Overview -

This is a trojan detection. Unlike viruses, trojans do not self-replicate. They are spread manually, often under the premise that they are beneficial or wanted. The most common installation methods involve system or security exploitation, and unsuspecting users manually executing unknown programs. Distribution channels include email, malicious or hacked web pages, Internet Relay Chat (IRC), peer-to-peer networks, etc.

Characteristics

Characteristics -

This is Trojan detection for a Bredolab variant. 

When executed, this malware drops the following files:

• %UserDirectory%\qbothome\_qbotinj.exe
• %UserDirectory%\qbothome\_qbotnti.exe
• %UserDirectory%\qbothome\_qbot.dll
• %UserDirectory%\Start Menu\Programs\Startup\startup.bat
• %Root%\Tasks\*.job

(Where %UserDirectory% is the name of a user's home directory and %Root% is the root directory such as C:\)

 

Once the file is installed on a compromised machine, it will be owned by a domain admin account. Once the domain admin account is compromised the malware binary infects all other machines in the network by “Network Shares”. In most cases, the compromised machine will have the “admin$” and “C$” network shares on all the workstations and a compromised domain admin account.

Note : [‘$’ stands for network sharing]

By default, windows stores a local password hash for every cached login. Once a domain admin account is compromised, one has to assume that ALL passwords are now known for the entire network to the attacker. This worm also monitors keystrokes, which is easier than reversing the hashes to know the password of the compromised user to the attacker. 

 

The malware may also attempt to download the following files:

• q2l.exe
• iedw.exe
• si.txt
• seclog.txt
• _qbotnti.exe
• _qbotinj.exe
• nbl.txt
• removeme.txt
• irclog.txt

The following registry entry is created to allow itself to run at startup:

• Hkey_Local_Machine\Software\Microsoft\Windows\CurrentVersion\Run
        {Original Value} = "%UserDirectory%\qbothome\_qbotinj.exe"
      "%UserDirectory%\qbothome\_qbot.dll" /c {Original Data}

Connections may be made with the following domains:

• hxxp://www.cdcdcdcdc2121cdsfdfd.com
• hxxp://nt202.cn
• hxxp://nt010.cn
• hxxp://nt002.cn
• hxxp://up002.cn
• hxxp://adserv.co.in
• hxxp://zurnretail.com/cgi-bin/clientinfo3.pl
• hxxp://hostrmeter.com
• hxxp://hotbar.com

Symptoms

Symptoms -

• Presence of aforementioned files and registry entries.
• Presence of unexpected network connections.

Method of Infection

Method of Infection -

Trojans are not viruses, and as such do not contain any method to replicate by themselves. However they may be downloaded by other viruses and/or Trojans to be installed on the user's system. Alternatively they may be installed by visiting a malicious web page (either by clicking on a link, or by the website hosting a scripted exploit which installs the malwares).

Removal -

Removal -

All Users:
Use current engine and DAT files for detection and removal.

Modifications made to the system Registry and/or INI files for the purposes of hooking system startup, will be successfully removed if cleaning with the recommended engine and DAT combination (or higher).

Additional Windows ME/XP removal considerations

Variants

Variants -

N/A