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Trojan.Winlock.9241
Added to the Dr.Web virus database:
2013-07-12
Virus description added:
2013-07-19
Technical Information
To ensure autorun and distribution:
Modifies the following registry keys:
[<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'DirtyDecrypt' = '"\\?\%APPDATA%\Dirty\DirtyDecrypt.exe" /hide'
[<HKLM>\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon] 'Userinit' = '<SYSTEM32>\userinit.exe,,%PROGRAM_FILES%\microsoft frontpage\BLBCScYk.exe'
[<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'hbOLDNpM' = '<LS_APPDATA>\Identities\pNohIpSE.exe'
Creates or modifies the following files:
%HOMEPATH%\Start Menu\Programs\Startup\ZURFyiRH.exe
Malicious functions:
To bypass firewall, removes or modifies the following registry keys:
[<HKLM>\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile] 'EnableFirewall' = '00000000'
[<HKLM>\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile] 'DoNotAllowExceptions' = '00000000'
[<HKLM>\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile] 'DisableNotifications' = '00000001'
To complicate detection of its presence in the operating system,
blocks execution of the following system utilities:
Windows Task Manager (Taskmgr)
blocks the following features:
User Account Control (UAC)
Windows Security Center
Creates and executes the following:
'%APPDATA%\Dirty\DirtyDecrypt.exe'
'%TEMP%\vCECHeFQ.exe'
Modifies file system :
Creates the following files:
%APPDATA%\Microsoft\Protect\S-1-5-21-2052111302-484763869-725345543-1003\Preferred
%APPDATA%\Microsoft\Protect\S-1-5-21-2052111302-484763869-725345543-1003\9c9f13ee-7ce5-490d-b7fa-b0f068dd228e
%APPDATA%\Microsoft\Crypto\RSA\S-1-5-21-2052111302-484763869-725345543-1003\3ff6561d1b49399a51b7900e8a97afb3_23ef5514-3059-436f-a4a7-4cefaab20eb1
%APPDATA%\Microsoft\Crypto\RSA\S-1-5-21-2052111302-484763869-725345543-1003\01b4cd6eeeb403f8807248f4a4045343_23ef5514-3059-436f-a4a7-4cefaab20eb1
%APPDATA%\Microsoft\Crypto\RSA\S-1-5-21-2052111302-484763869-725345543-1003\b9f0ae80817374b26db03d01e8536059_23ef5514-3059-436f-a4a7-4cefaab20eb1
%APPDATA%\Microsoft\Crypto\RSA\S-1-5-21-2052111302-484763869-725345543-1003\ba6d73fc65cffec9046372ca3794c9f1_23ef5514-3059-436f-a4a7-4cefaab20eb1
%TEMP%\vCECHeFQ.exe
<LS_APPDATA>\Identities\pNohIpSE.exe
%PROGRAM_FILES%\microsoft frontpage\BLBCScYk.exe
%APPDATA%\Dirty\alertwall.jpg
<LS_APPDATA>\Dirty\DirtyDecrypt.exe
%APPDATA%\Dirty\DirtyDecrypt.exe
%PROGRAM_FILES%\Dirty\DirtyDecrypt.exe
Sets the 'hidden' attribute to the following files:
%HOMEPATH%\Start Menu\Programs\Startup\ZURFyiRH.exe
Deletes the following files:
%APPDATA%\Microsoft\Crypto\RSA\S-1-5-21-2052111302-484763869-725345543-1003\b9f0ae80817374b26db03d01e8536059_23ef5514-3059-436f-a4a7-4cefaab20eb1
Network activity:
Connects to:
'yi######kqayjeqinzqy.com':80
'dn####khujmrif.com':80
'se####ady-24.com':80
'vm####txdxeko.com':80
UDP:
DNS ASK je####zieymndl.com
DNS ASK ev####cthagxii.com
DNS ASK ds######zzrcssklnzsn.com
DNS ASK wk####byqitbvmb.com
DNS ASK eh#####deznlgondcl.com
DNS ASK jb#####nwzsjdxnel.com
DNS ASK gl####mpduaj.com
DNS ASK zx#####xiajxqloi.com
DNS ASK ou#####ulatzbapimk.com
DNS ASK ld###ysp.com
DNS ASK lp######jpayiqxggkxy.com
DNS ASK ct###fdg.com
DNS ASK fr#####plhjcswyay.com
DNS ASK tx#####zknyxxmjj.com
DNS ASK ns###enjcgg.com
DNS ASK bb####gbcpxwdc.com
DNS ASK jr###btbcj.com
DNS ASK gs####dmrqqwd.com
DNS ASK mj#####addngnkvwwf.com
DNS ASK pj###aszeg.com
DNS ASK zt#####tqhkjumxpwa.com
DNS ASK gh####ljketpcni.com
DNS ASK po####jxkoinm.com
DNS ASK jt#####silkzewkf.com
DNS ASK va#####majofnhju.com
DNS ASK vm####txdxeko.com
DNS ASK se####ady-24.com
DNS ASK yi######kqayjeqinzqy.com
DNS ASK il#####grjeytosagbu.com
DNS ASK dn####khujmrif.com
DNS ASK dx####knsbdsxv.com
DNS ASK iw#####zxhjflwbp.com
DNS ASK sk####ytdxaks.com
DNS ASK yj###xgtp.com
DNS ASK pd###zgeo.com
DNS ASK me####ixqglcdj.com
DNS ASK bh#####mpsgupgxara.com
DNS ASK mi###lmarz.com
DNS ASK is####vfligixxd.com
DNS ASK go####clmkyve.com
Miscellaneous:
Searches for the following windows:
ClassName: 'Indicator' WindowName: '(null)'
Curing recommendations
Windows
macOS
Linux
Android
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.
Use Dr.Web Anti-virus for macOS to run a full scan of your Mac.
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.
Find out more about Dr.Web for Android
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