BackDoor.XWormNET.3

Technical Information

To ensure autorun and distribution

Modifies the following registry keys

[HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\Run] 'dllhost' = '%ALLUSERSPROFILE%\dllhost.exe'

Creates or modifies the following files

<SYSTEM32>\tasks\dllhost
%APPDATA%\microsoft\windows\start menu\programs\startup\dllhost.lnk

Creates the following files on removable media

<Drive name for removable media>:\usbhost.exe
<Drive name for removable media>:\skos.rdf.lnk
<Drive name for removable media>:\iso27k_isms_implementation_and_certification_process_overview_v2.pptx.lnk
<Drive name for removable media>:\waterresourcesag.pptx.lnk
<Drive name for removable media>:\asaprojectcompetition.pptx.lnk
<Drive name for removable media>:\stoc13_ml_quoc_le.pptx.lnk
<Drive name for removable media>:\hypothyroidism_slides.pptx.lnk
<Drive name for removable media>:\indogerman2010.pptx.lnk
<Drive name for removable media>:\samieee_obiee_presentation.pptx.lnk
<Drive name for removable media>:\file1.ppt.lnk
<Drive name for removable media>:\ksearch_esa_talk.ppt.lnk
<Drive name for removable media>:\dissolveanother.png.lnk
<Drive name for removable media>:\background.png.lnk
<Drive name for removable media>:\calibre.png.lnk
<Drive name for removable media>:\swc_2009-03-02.rdf.lnk
<Drive name for removable media>:\arrow-down.png.lnk
<Drive name for removable media>:\bg_search_box.png.lnk
<Drive name for removable media>:\block.png.lnk
<Drive name for removable media>:\cbz.png.lnk
<Drive name for removable media>:\ck_ugo.pem.lnk
<Drive name for removable media>:\server.pem.lnk
<Drive name for removable media>:\ck.pem.lnk
<Drive name for removable media>:\delongcacert.pem.lnk
<Drive name for removable media>:\tunpersonalca1.pem.lnk
<Drive name for removable media>:\irgeek.pem.lnk
<Drive name for removable media>:\cert.pem.lnk
<Drive name for removable media>:\breakpoint.png.lnk
<Drive name for removable media>:\2.jpeg.lnk
<Drive name for removable media>:\schema.rdf.lnk
<Drive name for removable media>:\productos.zip.lnk
<Drive name for removable media>:\excel_example.zip.lnk
<Drive name for removable media>:\price.zip.lnk
<Drive name for removable media>:\subjectclassification.zip.lnk
<Drive name for removable media>:\national_autism_preparation_programs.xlsx.lnk
<Drive name for removable media>:\highly_cited_2001.xlsx.lnk
<Drive name for removable media>:\2013_smccc_competition_points_jul2013.xlsx.lnk
<Drive name for removable media>:\cee_mmsprogram_summary_public.xlsx.lnk
<Drive name for removable media>:\2013_finalsummaryforweb.xlsx.lnk
<Drive name for removable media>:\calculatorworksheet.xls.lnk
<Drive name for removable media>:\1sm_price.xls.lnk
<Drive name for removable media>:\subjectclassification.xls.lnk
<Drive name for removable media>:\hhhlcert.pem.lnk
<Drive name for removable media>:\sioc.rdf.lnk
<Drive name for removable media>:\contractualdeadlines.xls.lnk
<Drive name for removable media>:\guide_reorganization_mapping.xls.lnk
<Drive name for removable media>:\babyboymaintonotesbackground_pal.wmv.lnk
<Drive name for removable media>:\babyboymaintoscenesbackground.wmv.lnk
<Drive name for removable media>:\babyboymaintoscenesbackground_pal.wmv.lnk
<Drive name for removable media>:\waterlandhealthkano.rtf.lnk
<Drive name for removable media>:\router_manual.rtf.lnk
<Drive name for removable media>:\fungalnameauthors.rtf.lnk
<Drive name for removable media>:\krsweden.rtf.lnk
<Drive name for removable media>:\pubnet_855.rtf.lnk
<Drive name for removable media>:\20140114.rdf.lnk
<Drive name for removable media>:\taxus_baccata.rdf.lnk
<Drive name for removable media>:\productos.xls.lnk
<Drive name for removable media>:\contenttypes.rdf.lnk
<Drive name for removable media>:\dualectls.pdf.lnk
<Drive name for removable media>:\7790_preview.pdf.lnk
<Drive name for removable media>:\ff_ot_user_guide.pdf.lnk
<Drive name for removable media>:\sdksampleunprivdeveloper.cer.lnk
<Drive name for removable media>:\chromesetup.exe.lnk
<Drive name for removable media>:\calc.exe.lnk
<Drive name for removable media>:\glidescope_review_rev_010.docx.lnk
<Drive name for removable media>:\adhd_and_obesity.docx.lnk
<Drive name for removable media>:\holycrosschurchinstructions.docx.lnk
<Drive name for removable media>:\cveuropeo.doc.lnk
<Drive name for removable media>:\hanni_umami_chapter.doc.lnk
<Drive name for removable media>:\applicantform_en.doc.lnk
<Drive name for removable media>:\fi51.doc.lnk
<Drive name for removable media>:\weeklysheet1215.doc.lnk
<Drive name for removable media>:\508softwareandos.doc.lnk
<Drive name for removable media>:\removedtitles_records.zip.lnk
<Drive name for removable media>:\skypesetup.exe.lnk
<Drive name for removable media>:\contosoroot.cer.lnk
<Drive name for removable media>:\testcertificate.cer.lnk
<Drive name for removable media>:\pmd.cer.lnk
<Drive name for removable media>:\dashborder_96.bmp.lnk
<Drive name for removable media>:\dashborder_144.bmp.lnk
<Drive name for removable media>:\coffee.bmp.lnk
<Drive name for removable media>:\dashborder_120.bmp.lnk
<Drive name for removable media>:\tileimage.bmp.lnk
<Drive name for removable media>:\default.bmp.lnk
<Drive name for removable media>:\join.avi.lnk
<Drive name for removable media>:\delete.avi.lnk
<Drive name for removable media>:\split.avi.lnk
<Drive name for removable media>:\sdkfailsafeemulator.cer.lnk
<Drive name for removable media>:\fiche_inscription_2015.xls.lnk
<Drive name for removable media>:\trivial-merge.htm.lnk
<Drive name for removable media>:\ituneshelpunavailable.htm.lnk
<Drive name for removable media>:\tree_view.htm.lnk
<Drive name for removable media>:\fil_20060629111052.pdf.lnk
<Drive name for removable media>:\video_1.mp4.lnk
<Drive name for removable media>:\spanner.mov.lnk
<Drive name for removable media>:\etc6_m_1.mov.lnk
<Drive name for removable media>:\firefly1.mov.lnk
<Drive name for removable media>:\scan.mov.lnk
<Drive name for removable media>:\parnas_01.jpg.lnk
<Drive name for removable media>:\13.jpg.lnk
<Drive name for removable media>:\4f0bf7ff71f28.jpg.lnk
<Drive name for removable media>:\3.jpg.lnk
<Drive name for removable media>:\1189.jpg.lnk
<Drive name for removable media>:\garden.htm.lnk
<Drive name for removable media>:\2.jpg.lnk
<Drive name for removable media>:\wrar520.exe.lnk
<Drive name for removable media>:\pushkin.jpeg.lnk
<Drive name for removable media>:\3.jpeg.lnk
<Drive name for removable media>:\ituneshelpunavailable.html.lnk
<Drive name for removable media>:\alert.html.lnk
<Drive name for removable media>:\api-hashmap.html.lnk
<Drive name for removable media>:\adadsi.html.lnk
<Drive name for removable media>:\tree_view.html.lnk
<Drive name for removable media>:\iisstart.htm.lnk
<Drive name for removable media>:\64bit_notes.htm.lnk
<Drive name for removable media>:\browse.htm.lnk
<Drive name for removable media>:\alert.htm.lnk
<Drive name for removable media>:\13.jpeg.lnk
<Drive name for removable media>:\contractualdeadlines.zip.lnk

Malicious functions

To complicate detection of its presence in the operating system,

adds antivirus exclusion:

'<SYSTEM32>\windowspowershell\v1.0\powershell.exe' -ExecutionPolicy Bypass Add-MpPreference -ExclusionPath '%TEMP%\1.exe'
'<SYSTEM32>\windowspowershell\v1.0\powershell.exe' -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess '1.exe'
'<SYSTEM32>\windowspowershell\v1.0\powershell.exe' -ExecutionPolicy Bypass Add-MpPreference -ExclusionPath '%ALLUSERSPROFILE%\dllhost.exe'
'<SYSTEM32>\windowspowershell\v1.0\powershell.exe' -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'dllhost.exe'

Modifies file system

Creates the following files

%TEMP%\1.exe
%TEMP%\[freetp.org]pummel-party-multiplayer-fix-online-v8.exe
%TEMP%\is-he5p6.tmp\[freetp.org]pummel-party-multiplayer-fix-online-v8.tmp
%TEMP%\is-lnav9.tmp\_isetup\_setup64.tmp
%TEMP%\is-lnav9.tmp\_isetup\_shfoldr.dll
%TEMP%\is-lnav9.tmp\get_hw_caps.dll
%ALLUSERSPROFILE%\dllhost.exe

Sets the 'hidden' attribute to the following files

<Drive name for removable media>:\usbhost.exe

Network activity

Connects to

'ip##pi.com':80
'ap#.##legram.org':443

TCP

HTTP GET requests

http://ip##pi.com/line/?fi############

Other

'ap#.##legram.org':443

UDP

DNS ASK ip##pi.com
DNS ASK ap#.##legram.org

Miscellaneous

Searches for the following windows

ClassName: 'EDIT' WindowName: ''

Creates and executes the following

'%TEMP%\1.exe'
'%TEMP%\[freetp.org]pummel-party-multiplayer-fix-online-v8.exe'
'%TEMP%\is-he5p6.tmp\[freetp.org]pummel-party-multiplayer-fix-online-v8.tmp' /SL5="$60240,739062,190976,%TEMP%\[FreeTP.Org]Pummel-Party-Multiplayer-Fix-Online-v8.exe"
'%ALLUSERSPROFILE%\dllhost.exe'

Executes the following

'<SYSTEM32>\schtasks.exe' /create /f /RL HIGHEST /sc minute /mo 1 /tn "dllhost" /tr "%ALLUSERSPROFILE%\dllhost.exe"
'<SYSTEM32>\taskeng.exe' {995E1BFC-8DFC-4E30-97CD-C550E9EDF8E0} S-1-5-21-3150914307-1777937420-491476919-1000:qkzrqhtnqt\user:Interactive:[1]
'<SYSTEM32>\windowspowershell\v1.0\powershell.exe' -ExecutionPolicy Bypass Add-MpPreference -ExclusionPath '%TEMP%\1.exe'' (with hidden window)
'<SYSTEM32>\windowspowershell\v1.0\powershell.exe' -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess '1.exe'' (with hidden window)
'<SYSTEM32>\windowspowershell\v1.0\powershell.exe' -ExecutionPolicy Bypass Add-MpPreference -ExclusionPath '%ALLUSERSPROFILE%\dllhost.exe'' (with hidden window)
'<SYSTEM32>\windowspowershell\v1.0\powershell.exe' -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'dllhost.exe'' (with hidden window)
'<SYSTEM32>\schtasks.exe' /create /f /RL HIGHEST /sc minute /mo 1 /tn "dllhost" /tr "%ALLUSERSPROFILE%\dllhost.exe"' (with hidden window)
'%ALLUSERSPROFILE%\dllhost.exe' ' (with hidden window)

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