Virus:W32/Gnil.A
Summary
Gnil.A has the ability to infect remote computers over a local network and attempts to download and install other malware to the system.
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
Gnil.A may arrive in the system as an executable with an icon that depicts an alien.
Sample screenshot:
Once the execution of Gnil.A has been initiated, it will drop the following files into the Windows System directory:
- xrtnyo.exe - Loader of the .dll component
- xrtnyo.dll - Contains most of the payload
It will delete the executed copy of itself with the help of a batch file created in the temporary folder:
- ~Lying!.bAt
Gnil.A injects its .DLL component to the following processes:
- explorer.exe
- services.exe
- winlogon.exe
It terminates the following processes related to Viking and Fujacks variants:
- c0nime.exe
- iexpl0re.exe
- FuckJacks.exe
- Logo1_.exe
- Logo_1.exe
- nvscv32.exe
- Rundl132.exe
- spoclsv.exe
- svch0st.exe
Note: String comparison is case sensitive.
It infects binary files of the following extension:
- .exe
- .scr
Moreover Gnil.A also infects script files with the following extension:
- .asp
- .css
- .htm
- .html
- .js
It avoids infecting folders with the following strings:
- ComPlus Applications
- Common Files
- Delphi
- Internet Explorer
- Messenger
- Microsoft Frontpage
- Movie Maker
- NetMeeting
- Online Services
- Outlook Express
- RECYCLER
- System Volume Information
- System32
- WINNT
- WinRAR
- Windows
- Windows Media Player
- Windows NT
Note: String comparison is case sensitive. This is why most system files are still infected.
Gnil.A will append a code at the end of the script file to point to a malicious website:
- https://www.lovesa.info/l[BLOCKED].gif
Note: As of this writing the site is no longer available
Gnil.A may also use Internet Explorer to download from the said site. It gets the location of Internet Explorer by querying the following registry entry:
- HKLM\Software\Microsoft\Windows\CurrentVersion\App Paths\IEXPLORE.EXE
Or it may use the following hard coded path:
- C:\Program Files\Internet Explorer\IEXPLORE.EXE
Aside from infecting binary and script files as a way to propagate, it can also spread via network shares using a combination of the following strings as username and passwords:
- 000000
- 00000000
- 111111
- 11111111
- 121212
- 123123
- 123321
- 12345
- 123456
- 1234567
- 12345678
- 123456789
- 1234qwer
- 123abc
- 123asd
- 123qwe
- 5021314
- 5201314
- 520520
- 54321
- 654321
- 88888
- 88888888
- 999999
- Admin
- Administrator
- Password
- abc123
- abcd123
- admin
- admin123
- administrator
- asdf123
- byebye
- china
- computer
- database
- enable
- foobar
- fuckyou
- ghost
- godblessyou
- goodbye
- guest
- guest123
- guest321
- hao123
- happy
- ihavenopass
- iloveyou
- internet
- japan
- kaonima
- login
- loveyou
- mylove
- mypass
- mypass123
- oracle
- passwd
- password
- server
- super
- sybase
- temp123
- test123
- users
- wangba
- window
- windows
- windows2000
- windows2003
- windowsxp