The Agobot.AX variant was found on 26th of November 2003. This backdoor has functionality similar to its previous variants, but it is more powerful than earlier versions. Generic description of Agobot and information on previous Agobot variants can be found here:
The most important step of disinfection is the installation of security patches for the vulnerabilities exploited by Agobot.
Detailed information and patches are available from the following pages:
RPC/DCOM (MS03-026, fixed by MS03-039):
The neccessary patches can be downloaded from the pages above under the "Patch availability" section.
F-Secure Anti-Virus can detect and delete the Agobot infected files.
There are some differences in this backdoor variant comparing to its previous variants. They are described below.
The Agobot.ax backdoor copies itself as SCVHOST.EXE file to Windows System folder and creates startup keys for this file in System Registry:
On Windows NT-based systems the backdoor can start as a service.
The backdoor is controlled via an IRC bot, that is created on a certain IRC server in a specific channel when the backdoor's file is active. The following oprerations can be performed with via a bot:
The bot can harvest e-mail addresses. It has the functionality to read user's Address Book and send the list of e-mail addresses to the bot operator.
The backdoor can scan subnets for exploitable computers and send a list of their IPs to the bot operator. The scan is performed on ports 80, 135 and 445 for RPC/DCOM (MS03-026), RPC/Locator (MS03-001) and WebDAV (MS03-007) vulnerabilities.
The backdoor can perform the following types of DDoS (Distributed Denial of Service) attacks:
The attack can not be performed on the following sites:
When spreading to local network, Agobot.ax probes the following shares:
Agobot.ax tries to connect using the following account names:
When connecting, Agobot.ax uses the following passwords:
Agobot.ax has a huge list of processes that it is trying to terminate:
Agobot.ax also terminates processes belonging to other malware:
Agobot.ax tries to steal CD keys from the following games:
This variant of Agobot also steals Windows Product ID.
F-Secure Anti-Virus already detects this backdoor generically with the existing updates as 'Backdoor.Agobot.3.gen'.
Detection Type: PC