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Worm:Win32/Vobfus.FB

First posted on 03 March 2019.
Source: Microsoft

Aliases :

Worm:Win32/Vobfus.FB is also known as VBObfus.dv, Trojan.Win32.Jorik.Vobfus.cvtk, W32/Vobfus-AH, W32.Changeup.

Explanation :

Worm:Win32/Vobfus.FB is a member of Win32/Vobfus - a family of worms that spreads via network drives and removable drives. It may also download and execute arbitrary files. Installation Worm:Win32/Vobfus.FB creates the following files on an affected computer:
c:documents and settingsadministratormaeli.exe Spreads via… Removable drives Worm:Win32/Vobfus.FB may create the following files on targeted drives when spreading:

:...exe:..exe:maeli.exe:passwords.exe:porn.exe:
cx10.tmp:
cx11.tmp:
cx12.tmp:
cx7.tmp:
cx8.tmp:
cx9.tmp:
cxa.tmp:
cxb.tmp:
cxc.tmp:
cxd.tmp:
cxe.tmp:
cxf.tmp:secret.exe:sexy.exe:subst.exe
It also places an autorun.inf file in the root directory of the targeted drive. Such autorun.inf files contain execution instructions for the operating system, so that when the removable drive is accessed from another computer supporting the Autorun feature, the malware is launched automatically.
Note: This worm was observed to write an executable and create an autorun.inf file on a targeted drive in our automated testing environment. This is particularly common malware behavior, generally utilized in order to spread malware from computer to computer. It should also be noted that autorun.inf files on their own are not necessarily a sign of infection, as they are used by legitimate programs and installation CDs. Payload Modifies system settings Worm:Win32/Vobfus.FB stops the display of files that have 'system' and 'hidden' attributes by making the following registry modification:

Adds value: "ShowSuperHidden"
With data: "0"
To subkey: HKCUSoftwareMicrosoftWindowsCurrentVersionExplorerAdvanced
Contacts remote hostThe malware may contact a remote host at ns1.musiczipz.com using port 8003. Commonly, malware may contact a remote host for the following purposes:To report a new infection to its authorTo receive configuration or other dataTo download and execute arbitrary files (including updates or additional malware)To receive instruction from a remote attackerTo upload data taken from the affected computer
This malware description was produced and published using our automated analysis system's examination of file SHA1 a9013ad32aa543db571c6feeeb488277913b8442.

Last update 03 March 2019

 

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