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Welcome to the Viruswarning forums. All your original content has been ported to the new forums as well as new content and additional opportunities to interact with the authors of Viruswarn.com. You can always access old content at www.leedrake.com/forum . You may find some formatting was lost in the conversion and the older versions of the posts to be more readable....
But at least it's all here.
Enjoy!
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Viruswarn Forums
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Messages |
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Lee Drake
Posts:238
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| 05/20/2002 1:38 PM |
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| Both David and myself have seen a tremendous upswing in the number of instances of the "haha" or the "Hybris.Gen" worm being sent to us, and showing up in my shop for repair after infection. This worm seems to have really hit the top 10 lately. It's particularly nasty because you can't depend on a particular subject line - it actually modifies itself each time it goes out, with a wide variety of subjects. This worm DOES require that you open an attachment to run it, and is detected by good virus scanners such as McAfee and Norton Antivirus if you have your email protection turned on.
What It Does
W95.Hybris is a worm that spreads by email as an attachment to outgoing emails. The message may include the text "Snow White and the Seven dwarves" and the attachment may have one of several different names, including, but not limited to:
anpo porn(.scr
atchim.exe
branca de neve.scr
dunga.scr
dwarf4you.exe
enano porno.exe
joke.exe
midgets.scr
sexy virgin.scr
Hybris will infect your winsock wsock32.dll program, and invisibly send itself to others. It operates outside your email client, and is NOT email client dependent. ANY email client can be infected by this worm. Since it's examining your outgoing messages in the background to find the email addresses, it generally sends itself only to those you send email to (nice huh?). It will NOT attempt to open outlook and grab the email addresses out of your address book. The return address is generally HAHA on these messages.
How to Protect Yourself
As always, the best protection against such attacks is to use caution when opening messages of a suspicious nature that arrive from people you know. This goes double for messages that come with attachments. Regretfully, the best policy to have with regard to mail with attachments is to confirm by another means that the message is authentic before you open it. You can most easily do this by sending a new message to the person who sent you the unexpected attachment. If the sender replies that he or she did not send you such a message, discard the message and its attachment at once and ask the sender to investigate.
Additionally, most good antivirus programs these days will scan and clean incoming email messages BEFORE they hit your email client. Norton Antivirus for instance has this ability. Be sure it's enabled and your virus signatures are up to date.
If you feel the need for additional protection, see the instructions below for how to enable heuristic scanning.
Caution!
Be aware that heuristic scanning may raise some false alarms. You should carefully investigate and confirm any alert raised by your software's heuristic scanner before you hit the panic button. Get expert assistance in this regard if necessary. You will recognize such a message as follows:
Symantec will tell you that the report is from Hound Dog, which is what they call their heuristic scanning module.
McAfee will identify the virus as being of "unknown type" or "New VBS."
Here are the instructions for several common brands of anti-virus software:
Symantec NAV 5.0:
1. Click Options.
2. Click the Scanner tab.
3. Click Heuristics.
4. Make sure that "Enable Bloodhound" is checked.
5. Move the slider all the way to the right, and then click OK.
6. Click the Auto-Protect tab.
7. Click Heuristics.
8. Make sure that "Enable Bloodhound" is checked.
9. Move the slider all the way to the right, and then click OK.
10. Click OK.
Symantec NAV 2000:
1. Click Options.
2. In the Options list, double-click Manual Scans.
3. In the Options list, under Manual Scans, click Bloodhound.
4. Make sure that "Enable Bloodhound" is checked.
5. Move the slider to Highest level of protection.
6. In the Options list, double-click Auto-Protect.
7. In the Options list, under Auto-Protect, click Bloodhound.
8. Make sure that "Enable Bloodhound" is checked.
9. Move the slider to Highest level of protection.
10. Click OK.
McAfee VirusScan 4.5:
1. Right-click the VirusScan Console icon in the lower right corner of your task bar.
2. Highlight Vshield.
3. Click Task, then Properties.
4. Click Configure.
5. Click the button marked "Advanced."
6. Check the box marked "Enable heuristic scanning."
7. Click "Enable macro and program file heuristics scanning" to fully enable the feature.
8. Click the button marked "Apply" to enable the new settings.
9. Click the button marked "Download Scan."
10. Click the button marked "Advanced."
11. Check the box marked "Enable heuristic scanning."
12. Click "Enable macro and program file heuristics scanning" to fully enable the feature.
13. Click the button marked "Apply" to enable the new settings.
14. Click on the "OK" button.
15. The system will prompt. "System Scan will be loaded on startup. Would you like to load it now?" Click Yes to do so.
Further Details
For those who are interested, you can read further about this worm at any of the following locations:
McAfee: http://vil.nai.com/vil/virusChar.asp?virus_k=98873
Symantec: http://www.sarc.com/avcenter/venc/data/w95.hybris.gen.html
F-Secure/DataFellows: http://www.europe.f-secure.com/v-descs/hybris.shtml
NIPC: None in particular found
Summary
This worm is a nasty one, even after cleaning machines frequently have to be completely reinstalled to make them functional again. Better to trap it before than to try to clean up afterwards.
This concludes this VirusWarn notice.
Lee Drake, Moderator |
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