Summary
This is an IRC trojan, affecting only people who use the mIRC application to chat.
Removal
Based on the settings of your F-Secure security program, it will either automatically delete, quarantine or rename the detected program or file, or ask you for a desired action.
A False Positive is when a file is incorrectly detected as harmful, usually because its code or behavior resembles known harmful programs. A False Positive will usually be fixed in a subsequent database update without any action needed on your part. If you wish, you may also:
Check for the latest database updates
First, check if your F-Secure security program is using the latest updates, then try scanning the file again.
Submit a sample
After checking, if you still believe the file is incorrectly detected, you can submit a sample of it for re-analysis.
Note: If the file was moved to quarantine, you need to collect the file from quarantine before you can submit it.
Exclude a file from further scanning
If you are certain that the file is safe and want to continue using it, you can exclude it from further scanning by the F-Secure security product.
Note: You need administrative rights to change the settings.
Technical Details
Simple rules to avoid problems like this:
- Do NOT use AutoGet. Type /sreq ASK - Do NOT accept files from people/sites you do not know and trust - Never run an exe, or load a mIRC script, without knowing what it does
On execution of dmsetup.exe, the program will do the following:
1. COPY itself to four different directories on your hard drive 2. ADD "dmsetup" to the end of your AUTOEXEC.BAT (possibly past the EOF). This will run dmsetup.exe whenever you start your computer 3. CREATE c:\configg.sys (5 bytes), containing just one line, "ni!". 4. Make a BACKUP of the original mirc.ini as backup0412.ini (or backup04.ini). 5. create a NEW mirc.ini, which will load mircrem.ini The new mirc.ini installed by dmsetup.exe will: - overwrite your old settings, remove notify & channel lists, etc - window fonts will be back to default Fixedsys - your sign-on nick will be "a", userID and full name field "s". - the dccserver will be enabled for chat, send, and fserve, - this will allow outsiders to access your hard drive - fserve warning will be disabled, root dir will be c:\mirc\ - cause you to send the dmsetup.exe file to other people - cause you to quit IRC if sent a /msg with the word "goawaysilly" - quit message will be "'tis to I who seem so sad"
All replaced INI files should be restored from backups or the whole chat client should be reinstalled.
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