Base on my experience, it seems like a DDoS worm/Trojan is spreading via port 445, which is the Microsoft Windows 2000 & XP "SMB over TCP" port. Most of these type of worm/Trojan will look for open port 445, and use the guessable "users list" with "password dictionary" within the worm/Trojan files and try to compromise the systems. Guessable users are usually like "administrator", "admin", "test", "guest", "root", and etc... This type of worm/Trojan spread by scanning random IPs and started guessing the user and password combinations; therefore, if you are a target, you will see several attempts from the attackers in a short period of time. If you are compromised, this worm/Trojan can spread very quickly. I analyzed the original mIRC (port 445) worm/Trojan back in Sept. 2002, and it can be found at http://www.klcconsulting.net/mirc_virus_analysis.htm. There has been several variants, and simplified version of worm like Iraq_Oil. The only good defense is to block port 445 and port 139 ports on your firewall, and set strong passwords for every user on your network, including administrator accounts. Hope this helps, /Kyle Kyle Lai, CISSP, CISA KLC Consulting, Inc. 617-921-5410 klaiat_private www.klcconsulting.net -----Original Message----- From: Charles Hamby [mailto:fixerat_private] Sent: Thursday, February 27, 2003 1:25 PM To: incidentsat_private Subject: TCP 445 Scan? Morning/Afternoon All, Has anyone else recently been pegged with a large number of distributed TCP 445 scans over a short amount of time (within a few minutes)? A couple of days ago I was hit by roughly 60+ scans in a short amount of time; when I waded through it it wound up being about 45 unique IP address all looking for TCP 445. Below is an excerpt from my fireall log (Netscreen). Has anyone else been seeing these sorts of scans lately? I've only seen the one scan, so I haven't had a chance to capture any more traffic. -CDH 2003-2-23 23:05:52 Deny 213.51.247.114->W.X.Y.Z 0 sec TCP PORT 445 2003-2-23 23:05:49 Deny 213.51.247.114->W.X.Y.Z 0 sec TCP PORT 445 2003-2-23 23:05:36 Deny 213.51.21.143->W.X.Y.Z 0 sec TCP PORT 445 2003-2-23 23:05:33 Deny 213.51.21.143->W.X.Y.Z 0 sec TCP PORT 445 2003-2-23 23:05:30 Deny 12.242.204.86->W.X.Y.Z 0 sec TCP PORT 445 2003-2-23 23:05:27 Deny 12.242.204.86->W.X.Y.Z 0 sec TCP PORT 445 2003-2-23 23:05:23 Deny 62.253.118.133->W.X.Y.Z 0 sec TCP PORT 445 2003-2-23 23:05:21 Deny 65.163.177.202->W.X.Y.Z 0 sec TCP PORT 445 2003-2-23 23:05:20 Deny 62.253.118.133->W.X.Y.Z 0 sec TCP PORT 445 2003-2-23 23:05:19 Deny 217.1.167.84->W.X.Y.Z 0 sec TCP PORT 445 2003-2-23 23:05:18 Deny 65.163.177.202->W.X.Y.Z 0 sec TCP PORT 445 2003-2-23 23:05:18 Deny 12.231.241.129->W.X.Y.Z 0 sec TCP PORT 445 2003-2-23 23:05:18 Deny 24.66.39.214->W.X.Y.Z 0 sec TCP PORT 445 2003-2-23 23:05:17 Deny 12.229.115.40->W.X.Y.Z 0 sec TCP PORT 445 2003-2-23 23:05:16 Deny 62.190.172.203->W.X.Y.Z 0 sec TCP PORT 445 2003-2-23 23:05:16 Deny 217.1.167.84->W.X.Y.Z 0 sec TCP PORT 445 2003-2-23 23:05:16 Deny 217.162.202.177->W.X.Y.Z 0 sec TCP PORT 445 2003-2-23 23:05:16 Deny 217.162.183.155->W.X.Y.Z 0 sec TCP PORT 445 2003-2-23 23:05:15 Deny 12.231.241.129->W.X.Y.Z 0 sec TCP PORT 445 2003-2-23 23:05:15 Deny 24.66.39.214->W.X.Y.Z 0 sec TCP PORT 445 2003-2-23 23:05:14 Deny 141.153.232.196->W.X.Y.Z 0 sec TCP PORT 445 2003-2-23 23:05:14 Deny 12.229.115.40->W.X.Y.Z 0 sec TCP PORT 445 2003-2-23 23:05:14 Deny 12.231.161.15->W.X.Y.Z 0 sec TCP PORT 445 2003-2-23 23:05:13 Deny 217.162.7.16->W.X.Y.Z 0 sec TCP PORT 445 2003-2-23 23:05:13 Deny 62.190.172.203->W.X.Y.Z 0 sec TCP PORT 445 2003-2-23 23:05:13 Deny 12.242.250.247->W.X.Y.Z 0 sec TCP PORT 445 2003-2-23 23:05:13 Deny 217.162.202.177->W.X.Y.Z 0 sec TCP PORT 445 ---------------------------------------------------------------------------- <Pre>Lose another weekend managing your IDS? Take back your personal time. 15-day free trial of StillSecure Border Guard.</Pre> <A href="http://www.securityfocus.com/stillsecure"> http://www.securityfocus.com/stillsecure </A> --- Incoming mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.459 / Virus Database: 258 - Release Date: 2/25/2003 --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.459 / Virus Database: 258 - Release Date: 2/25/2003 ---------------------------------------------------------------------------- <Pre>Lose another weekend managing your IDS? Take back your personal time. 15-day free trial of StillSecure Border Guard.</Pre> <A href="http://www.securityfocus.com/stillsecure"> http://www.securityfocus.com/stillsecure </A>
This archive was generated by hypermail 2b30 : Tue Mar 04 2003 - 11:52:15 PST