Worm:Win32/Rbot.ST

Worm:Win32/Rbot.ST is a member of Win32/Rbot - a large family of IRC-controlled backdoors that allow unauthorized access and control of an affected computer. Using this backdoor, an attacker can perform a large number of different actions on an affected computer, including downloading and executing arbitrary files, stealing sensitive information and spreading to other computers using various methods.

Worm:Win32/Rbot.ST creates the following files on an affected computer:

Note: <system folder> refers to a variable location that is determined by the malware by querying the Operating System. The default installation location for the System folder for Windows 2000 and NT is C:\Winnt\System32; and for XP, Vista, and 7 is C:\Windows\System32.

Variants of the Win32/Rbot family may use a number of different methods in order to spread to other computers. Windows Live Messenger and/or AIM
Rbot may be ordered to spread via Messenger or AIM by a remote attacker using the backdoor functionality (see Payload section below for additional details). It can be ordered to send messages with a zipped copy of itself attached, or it can be ordered to send messages that contain URLs pointing to a remotely hosted copy of itself. It sends a message to all of the infected user's contacts. The file name of the ZIP archive, the URL of the remote copy and the messages it sends are variable and may be provided by the remote controller via the IRC backdoor. In the wild, when spreading, these variants have often been observed masquerading as images. Vulnerability exploit
Win32/Rbot may be ordered to spread by attempting to exploit a number of different vulnerabilities that affects Windows or other third party software. The list of vulnerabilities that may be targeted in this manner is highly variable. Previous system compromise
Win32/Rbot may be instructed to spread through backdoor ports opened by Mydoom, Bagle, Optix, Netdevil, and other malicious software families. Network shares/weak passwords
Win32/Rbot may spread to remote computers by using a list of weak passwords that it carries with it against accounts that may exist on a targeted computer.

Worm:Win32/Rbot.ST may contact a remote host at 69.64.49.35 using port 80. Commonly, malware may contact a remote host for the following purposes:

• To report a new infection to its author
• To receive configuration or other data
• To download and execute arbitrary files (including updates or additional malware)
• To receive instruction from a remote attacker
• To upload data taken from the affected computer

This malware description was produced and published using our automated analysis system's examination of file SHA1 cc27f5038664a263fa0c0e7b1303a3fe8f65bdd6.