Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 bdd5d09b0ecdf7a0…

MALICIOUS

Office (OLE)

123.9 KB First seen: 2019-06-27
MD5: b9e78ffaf724a88f9d86e04304b4079f SHA-1: 57b1e618cfa6c6ad7392bdf09e453834deb8a0a3 SHA-256: bdd5d09b0ecdf7a0a274403de62cb9586adb829578e1903583acc49bcec93b60
124 Risk Score

Malware Insights

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

The sample contains a legacy WordBasic AutoOpen macro that is configured to execute a shell command. Although VBA extraction failed, the presence of the AutoOpen marker and the execution token strongly indicate malicious intent. ClamAV detection further confirms its malicious nature, identifying it as Doc.Malware.Valyria-6874342-0. The attack pattern is likely a macro-based downloader, and the initial access vector is presumed to be spearphishing.

Heuristics 5

  • ClamAV: Doc.Malware.Valyria-6874342-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.Valyria-6874342-0
  • VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC
    Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
  • 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.
  • Unsupported Office format for VBA extraction info OFFICE_FORMAT_UNSUPPORTED
    The Analyzer could not extract VBA macros: the document may be legacy, encrypted or malformed.
  • 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)

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