UNDERGROUND

NASA's vulnerable computers. The first anti-WANK program did just that. It quietly sat on the SPAN computers all day long, posing as a NETW_ process, faking out any real version of the WANK worm which should come along.

Oberman completed an anti-WANK program first and ran it by McMahon. It worked well, but McMahon noticed one large flaw. Oberman's program checked for the NETW_ process name, but it assumed that the worm was running under the SYSTEM group. In most cases, this was true, but it didn't have to be. If the worm was running in another group, Oberman's program would be useless. When McMahon pointed out the flaw, Oberman thought, God, how did I miss that?

McMahon worked up his own version of an anti-WANK program, based on Oberman's program, in preparation for releasing it to NASA.

At the same time, Oberman revised his anti-WANK program for DOE. By Monday night US Eastern Standard Time, Oberman was able to send out an early copy of a vaccine designed to protect computers which hadn't been infected yet, along with an electronic warning about the worm. His first elec- tronic warning, distributed by CIAC, said in part:

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THE COMPUTER INCIDENT ADVISORY CAPABILITY C I A C ADVISORY NOTICE
The W.COM Worm affecting VAX VMS Systems
October 16, 1989 18:37 PSTNumber A-2
This is a mean bug to kill and could have done a lot of damage.
Since it notifies (by mail) someone of each successful pene- tration and leaves a trapdoor (the FIELD account), just killing the bug is not adequate. You must go in and make sure all accounts have passwords and that the passwords are not the same as the account name.
R. Kevin Oberman