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Trojan.Siggen8.53976

Added to the Dr.Web virus database: 2019-11-06

Virus description added:

Technical Information

To ensure autorun and distribution
Creates or modifies the following files
  • <SYSTEM32>\tasks\system\systemcheck
Malicious functions
Injects code into
the following user processes:
  • helper.exe
Searches for windows to
detect analytical utilities:
  • ClassName: 'OLLYDBG', WindowName: ''
  • ClassName: 'GBDYLLO', WindowName: ''
  • ClassName: 'pediy06', WindowName: ''
  • ClassName: 'FilemonClass', WindowName: ''
  • ClassName: '', WindowName: 'File Monitor - Sysinternals: www.sysinternals.com'
  • ClassName: 'PROCMON_WINDOW_CLASS', WindowName: ''
  • ClassName: '', WindowName: 'Process Monitor - Sysinternals: www.sysinternals.com'
  • ClassName: 'RegmonClass', WindowName: ''
  • ClassName: '', WindowName: 'Registry Monitor - Sysinternals: www.sysinternals.com'
Modifies file system
Creates the following files
  • %TEMP%\autd90.tmp
  • %APPDATA%\microsoft\windows\tor\tordatasockslistenaddress 127.0.0.1\cached-certs.tmp
  • %APPDATA%\microsoft\windows\tor\tordatasockslistenaddress 127.0.0.1\unverified-microdesc-consensus.tmp
  • %APPDATA%\microsoft\windows\tor\tordata\tor.pid
  • %APPDATA%\microsoft\windows\tor\tordatasockslistenaddress 127.0.0.1\state.tmp
  • %APPDATA%\microsoft\windows\tor\tordata\torconfig
  • %APPDATA%\microsoft\windows\tor\zlib1.dll
  • %APPDATA%\microsoft\windows\tor\tor.exe
  • %APPDATA%\microsoft\windows\tor\ssleay32.dll
  • %APPDATA%\microsoft\windows\tor\libwinpthread-1.dll
  • %APPDATA%\microsoft\windows\tor\libssp-0.dll
  • %APPDATA%\microsoft\windows\tor\libgmp-10.dll
  • %APPDATA%\microsoft\windows\tor\libgcc_s_sjlj-1.dll
  • %APPDATA%\microsoft\windows\tor\libevent_extra-2-1-6.dll
  • %APPDATA%\microsoft\windows\tor\libevent_core-2-1-6.dll
  • %APPDATA%\microsoft\windows\tor\libevent-2-1-6.dll
  • %APPDATA%\microsoft\windows\tor\libeay32.dll
  • %APPDATA%\microsoft\windows\tor.tmp
  • %APPDATA%\microsoft\windows\helper.exe
  • %TEMP%\systemcheck.xml
  • %TEMP%\64.exe
  • %TEMP%\32.exe
  • %TEMP%\cl_debug_log.txt
  • %TEMP%\auta850.tmp
  • %TEMP%\cr_debug_log.txt
  • %TEMP%\asacpiex.dll
  • %APPDATA%\microsoft\windows\tor\tordatasockslistenaddress 127.0.0.1\cached-microdesc-consensus.tmp
  • %APPDATA%\microsoft\windows\tor\tordatasockslistenaddress 127.0.0.1\cached-microdescs.new
Deletes the following files
  • %TEMP%\autd90.tmp
  • %TEMP%\auta850.tmp
  • %TEMP%\systemcheck.xml
  • %TEMP%\32.exe
  • %TEMP%\64.exe
  • %TEMP%\cl_debug_log.txt
  • %TEMP%\cr_debug_log.txt
  • %TEMP%\asacpiex.dll
  • %APPDATA%\microsoft\windows\tor.tmp
  • %APPDATA%\microsoft\windows\tor\tordatasockslistenaddress 127.0.0.1\unverified-microdesc-consensus
  • %APPDATA%\microsoft\windows\tor\tordatasockslistenaddress 127.0.0.1\state
Moves the following files
  • from %APPDATA%\microsoft\windows\tor\tor.exe to %APPDATA%\microsoft\windows\tor\tor.exe
  • from %APPDATA%\microsoft\windows\tor\tordatasockslistenaddress 127.0.0.1\state.tmp to %APPDATA%\microsoft\windows\tor\tordatasockslistenaddress 127.0.0.1\state
  • from %APPDATA%\microsoft\windows\tor\tordatasockslistenaddress 127.0.0.1\unverified-microdesc-consensus.tmp to %APPDATA%\microsoft\windows\tor\tordatasockslistenaddress 127.0.0.1\unverified-microdesc-consensus
  • from %APPDATA%\microsoft\windows\tor\tordatasockslistenaddress 127.0.0.1\cached-certs.tmp to %APPDATA%\microsoft\windows\tor\tordatasockslistenaddress 127.0.0.1\cached-certs
  • from %APPDATA%\microsoft\windows\tor\tordatasockslistenaddress 127.0.0.1\cached-microdesc-consensus.tmp to %APPDATA%\microsoft\windows\tor\tordatasockslistenaddress 127.0.0.1\cached-microdesc-consensus
Substitutes the following files
  • %APPDATA%\microsoft\windows\tor\tordatasockslistenaddress 127.0.0.1\state
Deletes itself.
Network activity
TCP
HTTP GET requests
  • http://ez##at.ru/1tMZr7
  • 'ez##at.ru':443
  • 'localhost':9303
  • '81.#.16.182':443
  • '19#.#08.117.59':9001
  • '13#.#43.39.148':9001
  • '78.#6.79.4':9001
  • 'localhost':49177
  • UDP
    • DNS ASK ez##at.ru
    • DNS ASK ip###ger.org
    Miscellaneous
    Searches for the following windows
    • ClassName: '18467-41' WindowName: ''
    Creates and executes the following
    • '%TEMP%\cl_debug_log.txt' e -p"JDQJndnqwdnqw2139dn21n3b312idDQDB" "%TEMP%\CR_Debug_Log.txt" -o"%TEMP%\"
    • '%APPDATA%\microsoft\windows\helper.exe' -SystemCheck
    • '%APPDATA%\microsoft\windows\helper.exe' -SystemCheck66441
    • '%APPDATA%\microsoft\windows\helper.exe' e -p"DxSqsNKKOxqPrM4Y3xeK" "%APPDATA%\Microsoft\Windows\Tor.tmp" -o"%APPDATA%\Microsoft\Windows\Tor\"
    • '%APPDATA%\microsoft\windows\tor\tor.exe' -f TorConfig
    • '%TEMP%\cl_debug_log.txt' e -p"JDQJndnqwdnqw2139dn21n3b312idDQDB" "%TEMP%\CR_Debug_Log.txt" -o"%TEMP%\"' (with hidden window)
    • '%WINDIR%\syswow64\cmd.exe' /c schtasks.exe /Create /XML "%TEMP%\SystemCheck.xml" /TN "System\SystemCheck"' (with hidden window)
    • '%WINDIR%\syswow64\cmd.exe' /c For /L %i In (0,0,0) Do (del "<Full path to file>"&&timeout /t 0&&if not exist "<Full path to file>" exit)' (with hidden window)
    • '%APPDATA%\microsoft\windows\helper.exe' -SystemCheck' (with hidden window)
    • '%APPDATA%\microsoft\windows\helper.exe' e -p"DxSqsNKKOxqPrM4Y3xeK" "%APPDATA%\Microsoft\Windows\Tor.tmp" -o"%APPDATA%\Microsoft\Windows\Tor\"' (with hidden window)
    Executes the following
    • '%WINDIR%\syswow64\cmd.exe' /c schtasks.exe /Create /XML "%TEMP%\SystemCheck.xml" /TN "System\SystemCheck"
    • '%WINDIR%\syswow64\schtasks.exe' /Create /XML "%TEMP%\SystemCheck.xml" /TN "System\SystemCheck"
    • '%WINDIR%\syswow64\cmd.exe' /c For /L %i In (0,0,0) Do (del "<Full path to file>"&&timeout /t 0&&if not exist "<Full path to file>" exit)
    • '%WINDIR%\syswow64\timeout.exe' /t 0
    • '<SYSTEM32>\taskeng.exe' {50558A2C-52AE-4303-B433-C31E639FF9D6} S-1-5-21-1960123792-2022915161-3775307078-1001:hxseov\user:Interactive:[1]

    Curing recommendations

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      • 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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