Summary
A variant of the Atak worm was found on Friday 16th of July. It includes a list of security software it will attempt to terminate if found and composes more elaborate emails. It also performs a DDoS attack against www.techtv.com
Removal
Based on the settings of your F-Secure security product, it will either move the file to the quarantine where it cannot spread or cause harm, or remove it.
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
The worm will create a mutex named "SloperV2mtx-e-Machine" to avoid running more than once simultaneously.
It will copy itself to:
%SysDir%\SVRHOST.EXE
Where %SysDir% is the local Windows System folder. First the worm attempts to create the file and then deletes it, finally copying itself to such location.
It will add an entry to the win.ini file using the Windows API call WritePrivateProfileStringA from the Kernel32.dll. The entry will have the form:
[windows] load="%SysDir%\SVRHOST.EXE"
Which will make Windows execute the worm on startup.
This variant also attempts to find out whether there's a debugger loaded, if one is found the following string is shown in a message box:
lol! try to dig me?
As in the previous variant, the following string is contained within the worm's body:
-={ 4tt4(k 4g4!n$t N3tSky, B34gl3, MyD00m, L0vG4t3, N4ch!, Bl4st3r }=-
Some of the worm's text strings are scrambled by doing a logical NOT operation on each of their characters.
Email spreading
The messages will have any of the following subjects:
dont understand!! (disappear) (empty) what the tuut!! hurry up !!! got my file! big ears! home sweet home!? rate this! ginie file! wrong file! huh! you again! I know you!! always smile ;-D gotcha! ;-) happy! vote me again! thank for the idea Fwd: Re: hi! Warning! Report interesting hmmm.. varios keep plz! known issue the sender History Top 10 Hoax! Keep Up to date Familiar New Website Your Account Reserved for you Product Update greet bad news happy go lucky plz help us helo Expected!
The worm will collect email address from files with extensions:
.wab .adb .tbb .html .xml .cfg .vbs .msg .dbx .uin .jsp .asp .cgi .php .sht .mht .ods .log .htm .mbx .nch .eml .txt
The worm has its own SMTP engine which will use to deliver the infected emails.
Denial of service attack
Starting from the 8th of August the worm will attempt a DDoS attack against www.techtv.com. The worm resolves the hostname, it is not based on a hardcoded IP address.
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