Trojan.Siggen11.36254

Technical Information

To ensure autorun and distribution

Modifies the following registry keys

[<HKLM>\SOFTWARE\Microsoft\Windows\CurrentVersion\RunOnce] 'trkcore' = '%ALLUSERSPROFILE%\Microsoft\Roaming\svchost.exe'

Malicious functions

To complicate detection of its presence in the operating system,

blocks execution of the following system utilities:

Windows Task Manager (Taskmgr)

Terminates or attempts to terminate

the following system processes:

<SYSTEM32>\dwm.exe
%WINDIR%\explorer.exe
<SYSTEM32>\taskhost.exe

the following user processes:

iexplore.exe
firefox.exe

Modifies file system

Substitutes the following executable files

<Full path to file>

Moves itself

from <Full path to file> to <Current directory>\old_<File name>.exe

Deletes itself.

Network activity

TCP

HTTP GET requests

http://w.google.com/
http://pa###bin.com/raw/AqndxJKK

'pa###bin.com':443

UDP

DNS ASK cx###0fWHA.com
DNS ASK vV###gpbHF.com
DNS ASK Dq###jjpVt.com
DNS ASK O9###gYvBW.com
DNS ASK Bn###q7FWX.com
DNS ASK dj###qWmz4.com
DNS ASK Dd###Jv2su.com
DNS ASK w.google.com
DNS ASK PT###qybAq.com
DNS ASK pa###bin.com

Miscellaneous

Searches for the following windows

ClassName: 'Progman' WindowName: ''
ClassName: 'Proxy Desktop' WindowName: ''
ClassName: 'SystemTray_Main' WindowName: ''
ClassName: 'Media Center Tray Applet' WindowName: ''
ClassName: '' WindowName: 'View Available Networks'
ClassName: 'BluetoothNotificationAreaIconWindowClass' WindowName: 'BluetoothNotificationAreaIconWindowClass'
ClassName: 'BluetoothNotificationAreaIconWindowClass' WindowName: ''

Executes the following

'%WINDIR%\explorer.exe'

Curing recommendations

If the operating system (OS) can be loaded (either normally or in safe mode), download Dr.Web Security Space and run a full scan of your computer and removable media you use. More about Dr.Web Security Space.
If you cannot boot the OS, change the BIOS settings to boot your system from a CD or USB drive. Download the image of the emergency system repair disk Dr.Web® LiveDisk , mount it on a USB drive or burn it to a CD/DVD. After booting up with this media, run a full scan and cure all the detected threats.

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Use Dr.Web Anti-virus for macOS to run a full scan of your Mac.

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After booting up, run a full scan of all disk partitions with Dr.Web Anti-virus for Linux.

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If the mobile device is operating normally, download and install Dr.Web for Android. Run a full system scan and follow recommendations to neutralize the detected threats.
If the mobile device has been locked by Android.Locker ransomware (the message on the screen tells you that you have broken some law or demands a set ransom amount; or you will see some other announcement that prevents you from using the handheld normally), do the following:
- Load your smartphone or tablet in the safe mode (depending on the operating system version and specifications of the particular mobile device involved, this procedure can be performed in various ways; seek clarification from the user guide that was shipped with the device, or contact its manufacturer);
- Once you have activated safe mode, install the Dr.Web for Android onto the infected handheld and run a full scan of the system; follow the steps recommended for neutralizing the threats that have been detected;
- Switch off your device and turn it on as normal.

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