Threat Descriptions

Backdoor:W32/Oscarbot.gen!A

Classification

Category :

Malware

Type :

Backdoor

Platform :

W32

Aliases :

Backdoor:W32/Oscarbot.gen!A, Backdoor.Oscarbot, Backdoor.Win32.IRCBot, Worm:Win32/Pushbot (Microsoft) , W32/Sdbot.worm (McAfee), W32.IRCBot (Symantec)

Summary

A remote administration tool (RAT) that bypasses the security features of a program, computer or network to give unauthorized access or control to its user.

Removal

Based on the settings of your F-Secure security product, it will either move the file to the quarantine where it cannot spread or cause harm, or remove it.

A False Positive is when a file is incorrectly detected as harmful, usually because its code or behavior resembles known harmful programs. A False Positive will usually be fixed in a subsequent database update without any action needed on your part. If you wish, you may also:

  • Check for the latest database updates

    First check if your F-Secure security program is using the latest updates, then try scanning the file again.

  • Submit a sample

    After checking, if you still believe the file is incorrectly detected, you can submit a sample of it for re-analysis.

    Note: If the file was moved to quarantine, you need to collect the file from quarantine before you can submit it.

  • Exclude a file from further scanning

    If you are certain that the file is safe and want to continue using it, you can exclude it from further scanning by the F-Secure security product.

    Note: You need administrative rights to change the settings.

Technical Details

Pushbot is a backdoor program that can be operated through IRC. The backdoor is usually sized around 28-55KB.Pushbot is able to propagate through multiple vectors:

  • Removable media such as USB thumb drives
  • Instant Messaging (IM) networks such as AIM, MSN, ICQ and Triton
  • Network shares
  • Peer-to-Peer (P2P) networks such as Edonkey2000, Morpheus, KAZAA, LimeWire, BearShare and Grokster (via the application's shared folders)

Installation

During installation, the backdoor program creates a copy of itself in:

  • %windir%\service.exe

Activity

Upon execution, Pushbot displays the following:

While active, the program has the following functionalities:

  • Perform SYN Floods
  • Perform Distributed Denial of Service (DDoS) attacks
  • View MSN, AIM and Triton Threads
  • Propagate via AIM, MSN and Triton
  • Download files
  • Update itself
  • Steal passwords from Protected Storage
  • View processes
  • Create processes
  • Visit user defined websites
  • Perform shell executions

The backdoor program is also able to detect applications or services such as VMware, Nepenthes, sandboxes and honeypots

Registry

The backdoor program creates the following Registry key in order to automatically execute its copy in the Windows directory:

  • SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Windows Services = "service.exe"

It also creates the following Autorun.inf to facilitate its propagation on removable media such as USB thumb drives:

  • [autorun] open=RECYCLER\S-1-6-21-2434476501-1644491937-600003330-1213\autorunme.exe icon=%SystemRoot%\system32\SHELL32.dll,4 action=Open folder to view files shell\open=Open shell\open\command=RECYCLER\S-1-6-21-2434476501-1644491937-600003330-1213\autorunme.exe shell\open\default=1