Date: Wed, 01 Aug 2001 18:24:17 +0400 From: "Maximum" <m-a-x-i-m-u-m@mail.ru> To: freebsd-security@freebsd.org Subject: Trojan injected in my Freebsd 4.1-RELEASE Message-ID: <E15Rwv3-0000Ag-00@f4.mail.ru>
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Hi everybody, today I've got security report from my FreeBSD box that some suid files changed. That was /usr/bin/netstat, /usr/bin/fstat and /usr/bin/quote. Using chkproc programm from Nelson Murilo found at pangeia.com.br I found one stealth process. Running clean ps command i found ssh daemon sshd daemon named 'swapper' in process list. This daemon is attached to 50505 port. Also i found directory with other hacker's scripts and one of them contained full list of changed binaries that was : ps,ls,netstat,fstat,ldconfig and telnetd Examining logs I had not found any records about visit of hacker. Wtmp was cleared 5 hours back from time of created hackers scripts. I'm going not only remove this trojan from my box, but find from where attack was made and the way attack was made. Now I wrote small script that will run clean netstat and grep from output any connections to 50505 port and telnet port. This scripth I had included in my crontab and cron runs it every minute. This way I hope to find from where that man connects to me. Do you have any other suggestions to help me find how hacker injected trojan ? In one of shell script I'm talking about i found copyright mark "nrfbsdrk v0.1 by gREMLiNs". Thank you. Maxim Sorokin To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-security" in the body of the message
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