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Trojan.Encoder.24892

Added to the Dr.Web virus database: 2018-03-18

Virus description added:

Technical Information

To ensure autorun and distribution:
Modifies the following registry keys:
  • [<HKLM>\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon] 'Userinit' = '<SYSTEM32>\userinit.exe,,<LS_APPDATA>\jwaroevi\rarexsdb.exe'
  • [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'RarExsdb' = '<LS_APPDATA>\jwaroevi\rarexsdb.exe'
Creates or modifies the following files:
  • %HOMEPATH%\Start Menu\Programs\Startup\rarexsdb.exe
Malicious functions:
To bypass firewall, removes or modifies the following registry keys:
  • [<HKLM>\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile] 'DisableNotifications' = '00000001'
  • [<HKLM>\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile] 'DoNotAllowExceptions' = '00000000'
  • [<HKLM>\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile] 'EnableFirewall' = '00000000'
To complicate detection of its presence in the operating system,
blocks execution of the following system utilities:
  • Windows Update
  • Windows Security Center
blocks the following features:
  • User Account Control (UAC)
  • Windows Security Center
Injects code into
the following system processes:
  • <SYSTEM32>\svchost.exe
the following user processes:
  • byjjjqlf.exe
Modifies file system:
Creates the following files:
  • %ALLUSERSPROFILE%\Application Data\ybfcuwpc.log
  • <LS_APPDATA>\lawhwilb.log
  • <LS_APPDATA>\jwaroevi\rarexsdb.exe
  • %TEMP%\byjjjqlf.exe
  • %TEMP%\ifqydaby.exe
Sets the 'hidden' attribute to the following files:
  • %HOMEPATH%\Start Menu\Programs\Startup\rarexsdb.exe
Network activity:
Connects to:
  • 'cx#####xmbltfsjgmup.com':443
  • 'bu####dxegbr.com':443
  • 'go###uuvmp.com':443
  • 'ed###jmr.com':443
  • 'sh####fmnxvr.com':443
  • 'fe####csuruiow.com':443
  • 'fa#####vkcqtxbgarj.com':443
  • 'uj####7382uryhf.com':443
  • '74.##5.232.51':80
  • 'la####lcidqxk.com':443
  • 'kx####kigebkuq.com':443
  • 'bm#####yxdvtnnjnf.com':443
UDP:
  • DNS ASK xt###vkjpwo.com
  • DNS ASK xx####kwmaiigrv.com
  • DNS ASK xf###ujixl.com
  • DNS ASK ci###aystp.com
  • DNS ASK vg###cxujbk.com
  • DNS ASK qs####rouvbsnii.com
  • DNS ASK al#####pebklgwcx.com
  • DNS ASK po#####womxmoqya.com
  • DNS ASK od####hxjquysr.com
  • DNS ASK ri####eabkgax.com
  • DNS ASK dr#####svyxytlfhp.com
  • DNS ASK ku###dqrw.com
  • DNS ASK wt####hgialo.com
  • DNS ASK ll#####hmiotdkksaka.com
  • DNS ASK od###tusobp.com
  • DNS ASK pa#####bqxrlbytuse.com
  • DNS ASK bing.com
  • DNS ASK rv#####xiutmgwgt.com
  • DNS ASK hs#####xgqjkeplpd.com
  • DNS ASK se####lrceeg.com
  • DNS ASK mc###lhrjc.com
  • DNS ASK ex####qstvlx.com
  • DNS ASK jj####embtqk.com
  • DNS ASK mw#####exbkeseuw.com
  • DNS ASK jr####jjvfgcl.com
  • DNS ASK qv#####affvlahgnsxo.com
  • DNS ASK dg#####gslypoiok.com
  • DNS ASK fe####csuruiow.com
  • DNS ASK cx#####xmbltfsjgmup.com
  • DNS ASK bu####dxegbr.com
  • DNS ASK si###bpudb.com
  • DNS ASK ed###jmr.com
  • DNS ASK sh####fmnxvr.com
  • DNS ASK go###uuvmp.com
  • DNS ASK fa#####vkcqtxbgarj.com
  • DNS ASK uj####7382uryhf.com
  • DNS ASK google.com
  • DNS ASK la####lcidqxk.com
  • DNS ASK kx####kigebkuq.com
  • DNS ASK bm#####yxdvtnnjnf.com
  • DNS ASK ip#####viaulestxtua.com
  • DNS ASK bm###kvm.com
  • DNS ASK qw####dupiupr.com
  • DNS ASK tp####yghilmm.com
  • DNS ASK hp###iqqymr.com
  • DNS ASK sr#####xamnjpmqdat.com
  • DNS ASK an#####aeifcprlcrof.com
  • DNS ASK gt###vud.com
  • DNS ASK up#####rmjydqcys.com
  • DNS ASK hx###wpkrgv.com
  • DNS ASK bc#####hllkjfynl.com
  • DNS ASK pv#####vvemvfiaqbny.com
  • DNS ASK ov###jipg.com
Miscellaneous:
Creates and executes the following:
  • '%TEMP%\byjjjqlf.exe'
  • '<Full path to file>'
Executes the following:
  • '<SYSTEM32>\svchost.exe'

Curing recommendations

  1. 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.
  2. 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.
Download Dr.Web

Download by serial number

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

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

Download Dr.Web

Download by serial number

  1. 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.
  2. 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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