Virus Alert! http://www.avp.com/happy/happy.html The first modern Internet Worm discovered in-the-wild This computer worm is a kind of virus programs that does not affect files to spread its copies, but just sends itself to the Internet as an attach in the e-mail messages. The worm had been posted by somebody (maybe by virus author) to several news servers, and on next day Kaspersky labs got the report that it was discovered In-The-Wild in Europe and continued spreading. We have no reports from USA and other countries yet. The worm arrives as an attach in the e-mails as a HAPPY99.EXE file. Note:the affected sender does know that the worm appends attaches on sending. When an infected attach is executed and gets control, the worm displays a funny firework in a program's window to hide its malicious nature. During that it installs itself into the system, hooks sendings to the Internet, converts its code to the attach and appends it to the messages. As a result the worm being installed into the system is able to spread its copies to all the address the messages are sent to. Removal and Protection If the worm is detected in your system you can easy get rid of it just by deleting SKA.EXE and SKA.DLL files in the system Windows directory. You also should delete the WSOCK32.DLL file and replace it with WSOCK32.SKA original file. The original HAPPY99.EXE file should be also located and deleted. To protect your computer from re-infection you need just to set Read-Only attribute for the WSOCK32.DLL file. The worm does not pay attention to Read-Only mode, and fails to patch the file. This trick was discovered by Peter Szor at DataFellows http://www.datafellows.com The special AVP update (HAPPY.AVC database) allows to stop worm spreading and protect your computer from attach. It is distributed for free and is available on the AVP Web sites on the world. Easy to Remember Do not open and do not execute the HAPPY99.EXE file that you have received as an attach in any message ever if you get it from trusted source. You should also remember: the files that you have got from the Internet can contain malicious code that may infect your computer, destroy the data, send confidential files to the Internet, or install spy programs to monitor your computer from remote host. Opening MS Office files with disabled VirusProtection and executing not trusted executable files is extremely risky. You should remember about that each time you see an attach in incoming message. Technical Details While installing the worm copies itself to the Windows system directory with the SKA.EXE name and drops the additional SKA.DLL file in the same directory. The worm then copies the WSOCK95.DLL with the WSOCK95.SKA name (makes a "backup") and patches the WSOCK95.DLL file. If the WSOCK32.DLL is in use and cannot be opened for writing, the worm creates a new key in the system registry to run its dropper on next rebooting: HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\RunOnce =SKA.EXE The WSOCK32.DLL patch consists of a worm initialization routine and two redirected exports. The initialization routine is just a small piece of worm code - just 202 bytes. It is saved to the end of WSOCK32.DLL code section (".text" section). The WSOCK95.DLL has enough of space for that, and the size of WSOCK32.DLL does not increased during infection. Then the worm patches the WSOCK32.DLL export tables so that two functions ("connect" and "send") will point to the worm initialization routine at the end of WSOCK32.DLL code section. When a user is connecting to the Internet the WSOCK32.DLL is activated, and the worm hooks two events: connection and data sending. The worm monitors the nntp and email ports (25 and 119). When it detects connection by one of these ports, it loads its SKA.DLL library that has two exports: "mail" and "news". Depending on the port number the worm calls one of these routines, but both of them create a new message, insert UUencoded worm HAPPY99.EXE dropper into it, and send to the Internet address. On-line Learning Series of Courses http://www.bestnet.org/~jwalker/course.htm Member: Association for International Business _/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/ _/ _/ _/ John S. Walker _/ _/ Publisher, CSS Internet News (tm) _/ _/ (Internet Training and Research) _/ _/ PO Box 57247, Jackson Stn., _/ _/ Hamilton, Ontario, Canada, L8P 4X1 _/ _/ Email [log in to unmask] _/ _/ http://www.bestnet.org/~jwalker _/ _/ _/ _/ "To Teach is to touch a life forever" _/ _/ On the Web one touch can reach so far! _/ _/ _/ _/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/