IRC-Worm.DOS.Kazimas
| Alert Level : | Medium |
| Discovered: | Feb 19 2002 |
| Tag: | Internet Relay Chat Worms |
| Discoverer and Source: | http://www.kaspersky.com/ |
Malware Behavior and Technical Description
This is an IRC virus-worm that spreads itself via mIRC channels. It appears as a MILBUG_A.EXE DOS EXE file about 10Kb in length. When it is executed, it copies itself to several disk directories under different names:
C:\WINDOWS\KAZIMAS.EXE C:\WINDOWS\SYSTEM\PSYS.EXE C:\ICQPATCH.EXE C:\MIRC\NUKER.EXE C:\MIRC\DOWNLOAD\MIRC60.EXE C:\MIRC\LOGS\LOGGING.EXE C:\MIRC\SOUNDS\PLAYER.EXE C:\GAMES\SPIDER.EXE C:\WINDOWS\FREEMEM.EXE
The worm then infects the installed mIRC client in the C:\MIRC directory: it creates a new script file SCRPT.INI and overwrites the MIRC.INI configuration file. If the mIRC client is installed in any other path, the worm fails to infect it.
The worm modifies the MIRC.INI files that customize the mIRC client. There are several options set, for instance a user's identity is set to "kazimas", and the additional script file SCRPT.INI is included in auto-run scripts.
The SCRPT.INI file, that is dropped by the worm, contains several instructions that switch a user to the "Chat2K" channel, send messages to there, and the most important: send to the channel the worm copy (the C:\WINDOWS\KAZIMAS.EXE file).
The worm also overwrites the C:\AUTOEXEC.BAT file with instructions that restore worm's copies (if they are erased) and execution:
@copy c:\windows\system\psys.exe c:\windows\kazimas.exe >nul @copy c:\windows\kazimas.exe c:\kazimas.exe >nul @c:\kazimas.exe >nul @cls
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Removal IRC-Worm.DOS.Kazimas instructions:
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