Re: [Declude.Virus] High CPU F-Prot

Thu, 28 Apr 2005 10:05:03 -0700

After further review, I'm pretty sure that there is an F-Prot issue going on here.

My server hasn't been hitting 100% yet today, and I also haven't seen any F-Prot timeouts, however I have found more compelling evidence that there is an issue with F-Prot that would probably lead to timeouts if the load was heavy while some messages were scanned.  I searched my logs today for examples of where McAfee found Mytob, but F-Prot didn't detect anything.  There were a fair number of examples, and in every one, F-Prot took an uncharacteristically long time to scan the file.  Here are three examples that are marked with the gap corresponding to the F-Prot delays:
04/28/2005 05:49:04 QB18D740700A83968 MIME file: document.scr [base64; Length=52224 Checksum=6533396]
04/28/2005 05:49:04 QB18D740700A83968 Invalid SCR Vulnerability
04/28/2005 05:49:04 QB18D740700A83968 Banning file with SCR extension [application/octet-stream].
--- 6 second gap where F-Prot scans message ---
04/28/2005 05:49:10 QB18D740700A83968 Could not find parse string Infection:  in report.txt
04/28/2005 05:49:11 QB18D740700A83968 Scanner 2: Virus=the W32/[EMAIL PROTECTED] Attachment=document.scr [0] O
04/28/2005 05:49:11 QB18D740700A83968 File(s) are INFECTED [the W32/[EMAIL PROTECTED]: 13]
04/28/2005 05:49:11 QB18D740700A83968 Deleting file with virus
04/28/2005 05:49:11 QB18D740700A83968 Deleting E-mail with virus!
04/28/2005 05:49:11 QB18D740700A83968 Scanned: CONTAINS A VIRUS [MIME: 2 54788]
04/28/2005 05:49:11 QB18D740700A83968 From: [EMAIL PROTECTED] To: [EMAIL PROTECTED] [outgoing from 12.152.254.47]
04/28/2005 05:49:11 QB18D740700A83968 Subject: MAIL TRANSACTION FAILED

04/28/2005 09:09:41 QE095EDCB006E8802 MIME file: doc.zip [base64; Length=55408 Checksum=6875560]
--- 4 second gap where F-Prot scans message ---
04/28/2005 09:09:45 QE095EDCB006E8802 Could not find parse string Infection:  in report.txt
04/28/2005 09:09:46 QE095EDCB006E8802 Scanner 2: Virus=the W32/[EMAIL PROTECTED] Attachment= [0] O
04/28/2005 09:09:46 QE095EDCB006E8802 File(s) are INFECTED [the W32/[EMAIL PROTECTED]: 13]
04/28/2005 09:09:46 QE095EDCB006E8802 Deleting file with virus
04/28/2005 09:09:46 QE095EDCB006E8802 Deleting E-mail with virus!
04/28/2005 09:09:46 QE095EDCB006E8802 Scanned: CONTAINS A VIRUS [MIME: 2 55605]
04/28/2005 09:09:46 QE095EDCB006E8802 From: From: [EMAIL PROTECTED] To: [EMAIL PROTECTED] [outgoing from 208.7.179.200]
04/28/2005 09:09:46 QE095EDCB006E8802 Subject: hello

04/28/2005 09:47:55 QE98BF4DC00DA98FB MIME file: data.scr [base64; Length=56320 Checksum=6982245]
04/28/2005 09:47:55 QE98BF4DC00DA98FB Invalid SCR Vulnerability
04/28/2005 09:47:55 QE98BF4DC00DA98FB Banning file with SCR extension [application/octet-stream].
--- 9 second gap where F-Prot scans message ---
04/28/2005 09:48:04 QE98BF4DC00DA98FB Could not find parse string Infection:  in report.txt
04/28/2005 09:48:05 QE98BF4DC00DA98FB Scanner 2: Virus=the W32/[EMAIL PROTECTED] Attachment=data.scr [0] O
04/28/2005 09:48:05 QE98BF4DC00DA98FB File(s) are INFECTED [the W32/[EMAIL PROTECTED]: 13]
04/28/2005 09:48:05 QE98BF4DC00DA98FB Deleting file with virus
04/28/2005 09:48:05 QE98BF4DC00DA98FB Deleting E-mail with virus!
04/28/2005 09:48:05 QE98BF4DC00DA98FB Scanned: CONTAINS A VIRUS [MIME: 2 56551]
04/28/2005 09:48:05 QE98BF4DC00DA98FB From: From: [EMAIL PROTECTED] To: [EMAIL PROTECTED] [outgoing from 208.7.179.200]
04/28/2005 09:48:05 QE98BF4DC00DA98FB Subject: Good day
I'm virtually certain that this is what was happening yesterday, but under heavier load, F-Prot was taking longer to scan the messages than the 30 seconds that I allow it to.  There are no other long delays like this that I can find.  F-Prot based on past testing should detect a typical virus in 100 ms on my system, but it is not only taking much more time to scan a very small file, it is also missing the virus.

I suspect that this is happening on other systems, but the timeout issue probably wasn't seen as often because I have my timeout set to 30 seconds instead of 60 seconds, and I had very heavy load for much of the day yesterday.  If others are running two virus scanners including F-Prot, it would help to confirm my findings by searching for a hit on the second virus scanner hitting, but F-Prot missing and also taking several seconds or more to return a result.

If you search your logs for "Could not find parse string Infection:  in report.txt", it might help to narrow down the results.  I even tested with McAfee run first and then F-Prot and these messages would still appear when F-Prot didn't detect anything and McAfee did.  Here's an example with McAfee run first, detected a virus, and then F-Prot took it's time, generated a report.txt file but didn't return a virus result code:
04/28/2005 01:37:50 Q76AE2D3600E0E263 MIME file: text.zip [base64; Length=56434 Checksum=6987682]
04/28/2005 01:37:51 Q76AE2D3600E0E263 Scanner 1: Virus=the W32/[EMAIL PROTECTED] Attachment= [0] O
--- 7 second gap while F-Prot scans ---
04/28/2005 01:37:58 Q76AE2D3600E0E263 Could not find parse string Infection:  in report.txt
04/28/2005 01:37:58 Q76AE2D3600E0E263 File(s) are INFECTED [the W32/[EMAIL PROTECTED]: 8]
04/28/2005 01:37:58 Q76AE2D3600E0E263 Deleting file with virus
04/28/2005 01:37:58 Q76AE2D3600E0E263 Deleting E-mail with virus!
04/28/2005 01:37:58 Q76AE2D3600E0E263 Scanned: CONTAINS A VIRUS [MIME: 2 58564]
04/28/2005 01:37:58 Q76AE2D3600E0E263 From: [EMAIL PROTECTED] To: [EMAIL PROTECTED] [outgoing from 208.7.179.200]
04/28/2005 01:37:58 Q76AE2D3600E0E263 Subject: Good day
I'm guessing that F-Prot doesn't produce a Report.txt file unless something happens besides it being found clean, and this file is being generated after a long delay and contains no identifiable infection string and the result code isn't 3,6 or 8, otherwise Declude would have considered it a virus.  I'm guessing that the report.txt file contains a report of an error???

I'm also guessing that this might explain the high CPU usage that Darrell was reporting for F-Prot yesterday, though these events are not very common on my system, only about twice an hour it would seem.

Matt
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