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Détails du virusOscarBot.XW

Tous les détails, la description et les effets de OscarBot.XW

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OscarBot.XW

 
Threat LevelHigh threatDamageSevereDistributionNot widespread
At a glance Tech details | Solution
Common name:OscarBot.XW
Technical name:W32/OscarBot.XW
Threat level:Medium
Alias:Trojan.Win32.Buzus.cwwa,
Type:Virus
Effects:   It carries out damaging actions on the affected computer. It affects the productivity of the computer, the network to which it’s connected or other remote sites. It carries out actions that decrease the security level of the computer. It downloads files from several websites. It uses stealth techniques to avoid being detected by the user. It uses anti-monitoring techniques in order to prevent it being detected by antivirus companies. It spreads , across the Internet, via mapped drives, through shared network resources, through instant messaging, by infecting files that are then distributed.
Affected platforms:

Windows 2003/XP/2000/NT/ME/98/95

First detected on:Jan. 4, 2010
Detection updated on:May 21, 2010
StatisticsNo
Proactive protection:
Yes, using TruPrevent Technologies

Brief Description 

    

OscarBot.XW is a virus that spreads to other computers by copying its code to other files or programs.

 

It affects productivity, preventing tasks from being carried out:

  • In the affected computer: it converts the computer into a platform for taking malicious action surreptitiously: spam sending, launch of Denial of Service attacks, malware distribution, etc.
  • In the local network: it generates a large amount of network activity and consumes bandwidth.

 

It reduces the security level of the computer: it awaits remote-control orders received through IRC; it changes system permissions, decreasing the security level.

 

OscarBot.XW prevents access from programs to websites of several companies related with security tools (antivirus programs, firewalls, etc.).

 

OscarBot.XW accesses several websites to download files, which it then runs. These can be any type of file, although they are normally malware.

 

It uses stealth techniques to avoid being detected by the user:

  • It uses techniques included in its code to hide itself while it is active.
  • It terminates processes corresponding to several security tools, such as antivirus programs and firewalls, to prevent detection.

 

It uses several methods in order to avoid detection by antivirus companies:

  • It terminates its own execution if it detects that it is being executed in a virtual machine environment, such as VMWare or VirtualPC.

 

OscarBot.XW uses the following propagation or distribution methods:

  • Exploiting vulnerabilities with the intervention of the user: exploiting vulnerabilities in file formats or applications. To exploit them successfully it needs the intervention of the user: opening files, viewing malicious web pages, reading emails, etc.
  • Via Internet, exploiting remote vulnerabilities: attacking random IP addresses, in which it tries to insert a copy of itself by exploiting one or more vulnerabilities.
  • Instant messaging: it sends links pointing to a copy of itself to all users included in the infected user's contacts list.
  • Computer networks (mapped drives): it creates copies of itself in mapped drives.
  • Computer networks (shared resources): it creates copies of itself in shared network resources to which it has access.
  • File infection: it infects different types of files, which are then distributed through any of the usual means: floppy disks, email messages with attachments, Internet download, files transferred via FTP, IRC channels, P2P file sharing networks, etc.

 

OscarBot.XW uses the following infection strategies:

  • Resident: once it has been run, the virus goes memory resident and stops functions belonging to the operating system. Therefore, every time the operating system or an application tries to access any of these functions, the virus will activate and infect new files.

OscarBot.XW

 
Threat LevelHigh threatDamageSevereDistributionNot widespread
At a glance Tech details Solution

Effects 

OscarBot.XW spreads to other computers by copying its code to other files or programs. It has damaging effects on the affected computer.

 

It accesses several websites from which it downloads and runs files. The downloads can be any type of file, although they are normally malware.

 

  • It prevents access from programs to websites of several companies related with security tools (antivirus programs, firewalls, etc.).

 

It avoids being detected by the user by using the following techniques:
  • Techniques included in its code to hide its files and processes while it is active.
  • It terminates processes belonging to several security tools, such as antivirus programs and firewalls, so they cannot warn the user of the presence of this malware on the computer.

 

It uses the following techniques to impede detection by antivirus companies:
  • It terminates its own execution if it detects that it is being executed in a virtual machine environment, such as VMWare or VirtualPC.

 

It affects productivity, preventing tasks from being carried out:

  • It turns the computer into a platform for malicious action against remote computers surreptitiously.

 

It causes a loss of productivity in the local network to which the compromised computer belongs:

  • It generates a large amount of network activity and consumes bandwidth.

 

It reduces the security level of the computer:

  • It changes system permissions, decreasing the security level.

 

Means of transmission 


Propagation through the exploits of remote vulnerabilities:

OscarBot.XW carries out the following process:

  • It spreads by attacking IP addresses obtained at random or from the network to which the infected computer belongs.
  • It tries to access the IP addresses under attack by exploiting an existing vulnerability or through an open port.
  • If it does this, it downloads a copy of itself onto the vulnerable computer.

 

Propagation through instant messaging programs:

OscarBot.XW carries out the following process:

  • The user receives a message through the instant messaging program.
  • This message includes a file or a link to a file hosted on a web page, etc.
  • The computer is infected when the user runs the file.
  • OscarBot.XW sends a copy of itself to all users in the contact list of the instant messaging program.

 

Propagation via mapped drives:

OscarBot.XW checks if the infected computer is connected to a network.

If so, it makes an inventory of all mapped drives and creates a copy of itself in each of them.

 

Propagation through shared network resources:

OscarBot.XW checks if the infected computer is connected to a network. If so, it tries to spread to the shared network drives.

To do this, it tries to gain access to these shared drives, using typical or easily guessed passwords.

 

Distribution of infected files:

OscarBot.XW does not spread automatically using its own means, but infects files of the following types:

    They reach computers when previously infected files are distributed, entering computers through any of the usual channels: floppy disks, email messages with attachments, Internet download, files transferred via FTP, IRC channels, P2P file sharing networks, etc.

     

    Further Details  

    OscarBot.XW has the following additional characteristics:

    • It is 165888 bytes in size.

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