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Trojan.DownLoader26.736

Added to the Dr.Web virus database: 2017-12-13

Virus description added:

Technical Information

To ensure autorun and distribution:
Modifies the following registry keys:
  • [<HKLM>\SOFTWARE\Classes\MSProgramGroup\Shell\Open\Command] '' = '<SYSTEM32>\grpconv.exe %1'
  • [<HKLM>\SOFTWARE\Microsoft\Windows\CurrentVersion\RunOnce] 'GrpConv' = 'grpconv -o'
Creates the following services:
  • [<HKLM>\SYSTEM\ControlSet001\Services\IDMTDI] 'ImagePath' = 'system32\DRIVERS\idmtdi.sys'
  • [<HKLM>\SYSTEM\ControlSet001\Services\IDMTDI] 'Start' = '00000001'
Malicious functions:
Terminates or attempts to terminate
the following system processes:
  • <SYSTEM32>\cmd.exe
Modifies file system:
Creates the following files:
  • %ProgramFiles%\Internet Download Manager\Languages\inst_cz.lng
  • %ProgramFiles%\Internet Download Manager\Languages\inst_cht.lng
  • %ProgramFiles%\Internet Download Manager\Languages\inst_de.lng
  • %ProgramFiles%\Internet Download Manager\Languages\inst_es.lng
  • %ProgramFiles%\Internet Download Manager\Languages\inst_dk.lng
  • %ProgramFiles%\Internet Download Manager\Languages\inst_al.lng
  • %ProgramFiles%\Internet Download Manager\Languages\idm_ua.lng
  • %ProgramFiles%\Internet Download Manager\Languages\inst_ar.lng
  • %ProgramFiles%\Internet Download Manager\Languages\inst_chn.lng
  • %ProgramFiles%\Internet Download Manager\Languages\inst_bg.lng
  • %ProgramFiles%\Internet Download Manager\Languages\inst_fa.lng
  • %ProgramFiles%\Internet Download Manager\Languages\inst_kr.lng
  • %ProgramFiles%\Internet Download Manager\Languages\inst_iw.lng
  • %ProgramFiles%\Internet Download Manager\Languages\inst_my.lng
  • %ProgramFiles%\Internet Download Manager\Languages\inst_pt.lng
  • %ProgramFiles%\Internet Download Manager\Languages\inst_pl.lng
  • %ProgramFiles%\Internet Download Manager\Languages\inst_gr.lng
  • %ProgramFiles%\Internet Download Manager\Languages\inst_fr.lng
  • %ProgramFiles%\Internet Download Manager\Languages\inst_hu.lng
  • %ProgramFiles%\Internet Download Manager\Languages\inst_it.lng
  • %ProgramFiles%\Internet Download Manager\Languages\inst_id.lng
  • %ProgramFiles%\Internet Download Manager\IDMEdgeExt\images\logoTonec.gif
  • %ProgramFiles%\Internet Download Manager\IDMEdgeExt\images\logoSmall.png
  • %ProgramFiles%\Internet Download Manager\Languages\grabber_ru.chm
  • %ProgramFiles%\Internet Download Manager\Languages\idm_de.lng
  • %ProgramFiles%\Internet Download Manager\Languages\idm_ar.lng
  • %ProgramFiles%\Internet Download Manager\IDMEdgeExt\images\dwnlLink.png
  • %ProgramFiles%\Internet Download Manager\IDMEdgeExt\_metadata\verified_contents.json
  • %ProgramFiles%\Internet Download Manager\IDMEdgeExt\images\headBkgd.gif
  • %ProgramFiles%\Internet Download Manager\IDMEdgeExt\images\logoBig.png
  • %ProgramFiles%\Internet Download Manager\IDMEdgeExt\images\headTitle.gif
  • %ProgramFiles%\Internet Download Manager\Languages\idm_es.lng
  • %ProgramFiles%\Internet Download Manager\Languages\idm_ru.chm
  • %ProgramFiles%\Internet Download Manager\Languages\idm_ptbr.lng
  • %ProgramFiles%\Internet Download Manager\Languages\idm_ru.lng
  • %ProgramFiles%\Internet Download Manager\Languages\idm_tr.lng
  • %ProgramFiles%\Internet Download Manager\Languages\idm_th.lng
  • %ProgramFiles%\Internet Download Manager\Languages\idm_fr.lng
  • %ProgramFiles%\Internet Download Manager\Languages\idm_fa.lng
  • %ProgramFiles%\Internet Download Manager\Languages\idm_it.lng
  • %ProgramFiles%\Internet Download Manager\Languages\idm_pl.lng
  • %ProgramFiles%\Internet Download Manager\Languages\idm_nl.lng
  • %ProgramFiles%\Internet Download Manager\Toolbar\3d_largeHot_3_hdpi15.bmp
  • %ProgramFiles%\Internet Download Manager\Toolbar\3d_largeHot_3.bmp
  • %ProgramFiles%\Internet Download Manager\Toolbar\3d_large_3.bmp
  • %ProgramFiles%\Internet Download Manager\Toolbar\3d_smallHot_3.bmp
  • %ProgramFiles%\Internet Download Manager\Toolbar\3d_large_3_hdpi15.bmp
  • %ProgramFiles%\Internet Download Manager\Languages\tips_th.txt
  • %ProgramFiles%\Internet Download Manager\Languages\tips_ru.txt
  • %ProgramFiles%\Internet Download Manager\Languages\tips_tr.txt
  • %ProgramFiles%\Internet Download Manager\Languages\tut_ru.chm
  • %ProgramFiles%\Internet Download Manager\Languages\tips_ua.txt
  • %ProgramFiles%\Internet Download Manager\Toolbar\3d_small_3.bmp
  • %TEMP%\Cab10.tmp
  • %TEMP%\CabE.tmp
  • %WINDIR%\inf\oem3.inf
  • <DRIVERS>\SET12.tmp
  • %WINDIR%\inf\oem3.PNF
  • %ProgramFiles%\Internet Download Manager\Uninstall-ME.exe
  • %ProgramFiles%\Internet Download Manager\Toolbar\3d_style_3.tbi
  • %TEMP%\Cab8.tmp
  • %TEMP%\CabC.tmp
  • %TEMP%\CabA.tmp
  • %ProgramFiles%\Internet Download Manager\Languages\inst_ua.lng
  • %ProgramFiles%\Internet Download Manager\Languages\inst_tr.lng
  • %ProgramFiles%\Internet Download Manager\Languages\inst_uz.lng
  • %ProgramFiles%\Internet Download Manager\Languages\scheduler_ru.chm
  • %ProgramFiles%\Internet Download Manager\Languages\inst_vn.lng
  • %ProgramFiles%\Internet Download Manager\Languages\inst_ru.lng
  • %ProgramFiles%\Internet Download Manager\Languages\inst_ptbr.lng
  • %ProgramFiles%\Internet Download Manager\Languages\inst_sk.lng
  • %ProgramFiles%\Internet Download Manager\Languages\inst_th.lng
  • %ProgramFiles%\Internet Download Manager\Languages\inst_src.lng
  • %ProgramFiles%\Internet Download Manager\Languages\template.lng
  • %ProgramFiles%\Internet Download Manager\Languages\tips_it.txt
  • %ProgramFiles%\Internet Download Manager\Languages\tips_fr.txt
  • %ProgramFiles%\Internet Download Manager\Languages\tips_nl.txt
  • %ProgramFiles%\Internet Download Manager\Languages\tips_ptbr.txt
  • %ProgramFiles%\Internet Download Manager\Languages\tips_pl.txt
  • %ProgramFiles%\Internet Download Manager\Languages\tips_ar.txt
  • %ProgramFiles%\Internet Download Manager\Languages\template_inst.lng
  • %ProgramFiles%\Internet Download Manager\Languages\tips_de.txt
  • %ProgramFiles%\Internet Download Manager\Languages\tips_fa.txt
  • %ProgramFiles%\Internet Download Manager\Languages\tips_es.txt
  • %ProgramFiles%\Internet Download Manager\downlWithIDM.dll
  • %ProgramFiles%\Internet Download Manager\defexclist.txt
  • %ProgramFiles%\Internet Download Manager\downlWithIDM64.dll
  • %ProgramFiles%\Internet Download Manager\idmBroker.exe
  • %ProgramFiles%\Internet Download Manager\grabber.chm
  • %ProgramFiles%\Internet Download Manager\IEGetVL2.htm
  • %ProgramFiles%\Internet Download Manager\IEGetVL.htm
  • %ProgramFiles%\Internet Download Manager\IEMonitor.exe
  • %ProgramFiles%\Internet Download Manager\Uninstall.exe
  • %ProgramFiles%\Internet Download Manager\MediumILStart.exe
  • %ProgramFiles%\Internet Download Manager\idman.chm
  • %ProgramFiles%\Internet Download Manager\idmftype.dll
  • %ProgramFiles%\Internet Download Manager\idmfsa.dll
  • %ProgramFiles%\Internet Download Manager\idmindex.dll
  • %ProgramFiles%\Internet Download Manager\idmmzcc.xpi
  • %ProgramFiles%\Internet Download Manager\idmmkb.dll
  • %ProgramFiles%\Internet Download Manager\idmbrbtn.dll
  • %ProgramFiles%\Internet Download Manager\idmantypeinfo.tlb
  • %ProgramFiles%\Internet Download Manager\idmbrbtn64.dll
  • %ProgramFiles%\Internet Download Manager\idmcchandler7_64.dll
  • %ProgramFiles%\Internet Download Manager\idmcchandler7.dll
  • %ProgramFiles%\Internet Download Manager\IDMFType64.dll
  • %ProgramFiles%\Internet Download Manager\IDMFType.dat
  • %ProgramFiles%\Internet Download Manager\IDMGCExt.crx
  • %ProgramFiles%\Internet Download Manager\IDMGetAll64.dll
  • %ProgramFiles%\Internet Download Manager\IDMGetAll.dll
  • %TEMP%\aut1.tmp
  • %TEMP%\icon.ico
  • %CommonProgramFiles%\System\IDMs.exe
  • %ProgramFiles%\Internet Download Manager\Cleanup.cmd
  • %TEMP%\nsu3.tmp
  • %ProgramFiles%\Internet Download Manager\IDMGrHlp.exe
  • %ProgramFiles%\Internet Download Manager\IDMShellExt64.dll
  • %ProgramFiles%\Internet Download Manager\IDMShellExt.dll
  • %ProgramFiles%\Internet Download Manager\IDMan.exe
  • %ProgramFiles%\Internet Download Manager\IEGetAll.htm
  • %ProgramFiles%\Internet Download Manager\IEExt.htm
  • %ProgramFiles%\Internet Download Manager\IDMIECC64.dll
  • %ProgramFiles%\Internet Download Manager\IDMIECC.dll
  • %ProgramFiles%\Internet Download Manager\IDMIntegrator64.exe
  • %ProgramFiles%\Internet Download Manager\IDMNetMon64.dll
  • %ProgramFiles%\Internet Download Manager\IDMNetMon.dll
  • %ProgramFiles%\Internet Download Manager\IDMEdgeExt\_locales\es\messages.json
  • %ProgramFiles%\Internet Download Manager\IDMEdgeExt\_locales\en\messages.json
  • %ProgramFiles%\Internet Download Manager\IDMEdgeExt\_locales\fa\messages.json
  • %ProgramFiles%\Internet Download Manager\IDMEdgeExt\_locales\he\messages.json
  • %ProgramFiles%\Internet Download Manager\IDMEdgeExt\_locales\fr\messages.json
  • %ProgramFiles%\Internet Download Manager\IDMEdgeExt\welcome.html
  • %ProgramFiles%\Internet Download Manager\IDMEdgeExt\manifest.json
  • %ProgramFiles%\Internet Download Manager\IDMEdgeExt\welcome.js
  • %ProgramFiles%\Internet Download Manager\IDMEdgeExt\_locales\de\messages.json
  • %ProgramFiles%\Internet Download Manager\IDMEdgeExt\_locales\ar\messages.json
  • %ProgramFiles%\Internet Download Manager\IDMEdgeExt\_locales\it\messages.json
  • %ProgramFiles%\Internet Download Manager\IDMEdgeExt\_locales\vn\messages.json
  • %ProgramFiles%\Internet Download Manager\IDMEdgeExt\_locales\tr\messages.json
  • %ProgramFiles%\Internet Download Manager\IDMEdgeExt\_locales\zh_cn\messages.json
  • %ProgramFiles%\Internet Download Manager\IDMEdgeExt\_metadata\computed_hashes.json
  • %ProgramFiles%\Internet Download Manager\IDMEdgeExt\_locales\zh_tw\messages.json
  • %ProgramFiles%\Internet Download Manager\IDMEdgeExt\_locales\pl\messages.json
  • %ProgramFiles%\Internet Download Manager\IDMEdgeExt\_locales\nl\messages.json
  • %ProgramFiles%\Internet Download Manager\IDMEdgeExt\_locales\pt\messages.json
  • %ProgramFiles%\Internet Download Manager\IDMEdgeExt\_locales\th\messages.json
  • %ProgramFiles%\Internet Download Manager\IDMEdgeExt\_locales\ru\messages.json
  • %ProgramFiles%\Internet Download Manager\idmtdi32.sys
  • %ProgramFiles%\Internet Download Manager\idmtdi.inf
  • %ProgramFiles%\Internet Download Manager\idmtdi64.sys
  • %ProgramFiles%\Internet Download Manager\idmvs.dll
  • %ProgramFiles%\Internet Download Manager\idmvconv.dll
  • %ProgramFiles%\Internet Download Manager\idmmzcc3.xpi
  • %ProgramFiles%\Internet Download Manager\idmmzcc2.xpi
  • %ProgramFiles%\Internet Download Manager\idmmzcc7.dll
  • %ProgramFiles%\Internet Download Manager\idmtdi.cat
  • %ProgramFiles%\Internet Download Manager\idmmzcc7_64.dll
  • %ProgramFiles%\Internet Download Manager\idmwfp.cat
  • %ProgramFiles%\Internet Download Manager\IDMEdgeExt\background.js
  • %ProgramFiles%\Internet Download Manager\tutor.chm
  • %ProgramFiles%\Internet Download Manager\IDMEdgeExt\captured.html
  • %ProgramFiles%\Internet Download Manager\IDMEdgeExt\document.js
  • %ProgramFiles%\Internet Download Manager\IDMEdgeExt\content.js
  • %ProgramFiles%\Internet Download Manager\idmwfp32.sys
  • %ProgramFiles%\Internet Download Manager\idmwfp.inf
  • %ProgramFiles%\Internet Download Manager\idmwfp64.sys
  • %ProgramFiles%\Internet Download Manager\tips.txt
  • %ProgramFiles%\Internet Download Manager\scheduler.chm
Deletes the following files:
  • %TEMP%\CabC.tmp
  • %TEMP%\CabE.tmp
  • %TEMP%\Cab10.tmp
  • %TEMP%\CabA.tmp
  • %TEMP%\icon.ico
  • %TEMP%\aut1.tmp
  • %TEMP%\Cab8.tmp
Moves the following files:
  • from <DRIVERS>\SET12.tmp to <DRIVERS>\idmtdi.sys
Network activity:
Connects to:
  • 'www.download.windowsupdate.com':80
  • 'wp#d':80
TCP:
HTTP GET requests:
  • http://www.download.windowsupdate.com/msdownload/update/v3/static/trustedr/en/authrootstl.cab
  • http://www.download.windowsupdate.com/msdownload/update/v3/static/trustedr/en/authrootseq.txt
  • http://11#.#11.111.1/wpad.dat via wp#d
UDP:
  • DNS ASK www.download.windowsupdate.com
  • DNS ASK wp#d
Miscellaneous:
Creates and executes the following:
  • '%ProgramFiles%\Internet Download Manager\Uninstall.exe' -instdriv
  • '%TEMP%\nsp4.tmp\ns5.tmp' "%ProgramFiles%\Internet Download Manager\Uninstall.exe" -instdriv
  • '%CommonProgramFiles%\System\IDMs.exe' /S /EN /ND
Executes the following:
  • '<SYSTEM32>\net.exe' start IDMTDI
  • '<SYSTEM32>\net1.exe' start IDMTDI
  • '<SYSTEM32>\grpconv.exe' -o
  • '<SYSTEM32>\rundll32.exe' SETUPAPI.DLL,InstallHinfSection DefaultInstall 128 %ProgramFiles%\Internet Download Manager\idmtdi.inf
  • '<SYSTEM32>\runonce.exe' -r

Recommandations pour le traitement

  1. Si le système d'exploitation peut être démarré (en mode normal ou en mode sans échec), téléchargez Dr.Web Security Space et lancez un scan complet de votre ordinateur et de tous les supports amovibles que vous utilisez. En savoir plus sur Dr.Web Security Space.
  2. Si le démarrage du système d'exploitation est impossible, veuillez modifier les paramètres du BIOS de votre ordinateur pour démarrer votre ordinateur via CD/DVD ou clé USB. Téléchargez l'image du disque de secours de restauration du système Dr.Web® LiveDisk ou l'utilitaire pour enregistrer Dr.Web® LiveDisk sur une clé USB, puis préparez la clé USB appropriée. Démarrez l'ordinateur à l'aide de cette clé et lancez le scan complet et le traitement des menaces détectées.
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  2. Si l'appareil mobile est bloqué par le Trojan de la famille Android.Locker (un message sur la violation grave de la loi ou la demande d'une rançon est affiché sur l'écran de l'appareil mobile), procédez comme suit:
    • démarrez votre Smartphone ou votre tablette en mode sans échec (si vous ne savez pas comment faire, consultez la documentation de l'appareil mobile ou contactez le fabricant) ;
    • puis téléchargez et installez sur votre appareil mobile Dr.Web pour Android et lancez un scan complet puis suivez les recommandations sur la neutralisation des menaces détectées ;
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