Summary
This malware downloads files into the system and executes them.
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
Tibs.VX executes netsh.exe, a Windows command line utility, in order to allow the malware to bypass the Windows Firewall.It sends the following system information to http://pluscount.net:
- Platform
- Service Pack and Version
Files Created
- %windir%\system32\winds32.exe
- %windir%\system32\dflgh8jkd2q1.exe
- %windir%\system32\dflgh8jkd2q2.exe
- %windir%\system32\dflgh8jkd2q5.exe
- %windir%\system32\dflgh8jkd2q6.exe
- %windir%\system32\dflgh8jkd2q7.exe
- %windir%\system32\dflgh8jkd2q8.exe
- %windir%\system32\vx.tll
The downloaded files are detected as Trojan:W32/Tibs.NO, Trojan:W32/Tibs.NS, Trojan:W32/Tibs.NQ, Trojan:W32/Tibs.NR, Trojan:W32/Tibs.NP.The file called winds32.exe is a copy of original sample. The file called vx.tll is a 1 byte file.Temporary placeholders for the downloaded files:
- %temp%\1.dflb
- %temp%\2.dflb
- %temp%\3.dflb
- %temp%\4.dflb
- %temp%\5.dflb
- %temp%\6.dflb
- %temp%\7.dflb
Network
Tibs.VX attempts to download files from:
- http://pluscount.net/[...]/search.jpg
- http://pluscount.net/[...]/winlogon.jpg
- http://pluscount.net/[...]/tibs.jpg
- http://pluscount.net/[...]/null.jpg
- http://pluscount.net/[...]/tool.jpg
- http://pluscount.net/[...]/proxy.jpg
These URLs contain valid JPEG files with the malware code appended on them. The malware code is hidden via an XOR operation.
File System Changes
Creates these files:
- %temp%\1.dflb
- %temp%\2.dflb
- %temp%\3.dflb
- %temp%\4.dflb
- %temp%\5.dflb
- %temp%\6.dflb
- %temp%\7.dflb
- %windir%\system32\dflgh8jkd2q1.exe
- %windir%\system32\dflgh8jkd2q2.exe
- %windir%\system32\dflgh8jkd2q5.exe
- %windir%\system32\dflgh8jkd2q6.exe
- %windir%\system32\dflgh8jkd2q7.exe
- %windir%\system32\dflgh8jkd2q8.exe
- %windir%\system32\vx.tll
- %windir%\system32\winds32.exe
Network Connections
Attempts to download files from:
- Http://pluscount.net/[...]/search.jpg
- http://pluscount.net/[...]/winlogon.jpg
- http://pluscount.net/[...]/tibs.jpg
- http://pluscount.net/[...]/null.jpg
- http://pluscount.net/[...]/tool.jpg
- http://pluscount.net/[...]/proxy.jpg
Registry Modifications
Sets these values:
- HKLM\Software\Microsoft\Windows\CurrentVersion\Run System32 = C:\WINDOWS\system32\winds32.exe
- HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\System DisableTaskMgr = 00000001
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