Malicious Office (OLE) / .XLSX — malware analysis report

Static analysis result for SHA-256 b635119dae399800…

MALICIOUS

Office (OLE) / .XLSX

1.70 MB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: d305eca9083540a5928eca794be5b360 SHA-1: 80c6de7d0c80f4e9af8e03f4ceb97eab9f78f3ac SHA-256: b635119dae399800a2a46a92507a5e0dab83cfaee1d48ab70c342a74c0f3c9cb
132 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1059.005 Visual Basic T1204 User Execution: Malicious Link

The critical heuristic firing for CVE_2017_0199 indicates the exploitation of a known vulnerability in OLE objects to load remote content. The embedded PDF also contains suspicious static findings and an external URI. The primary malicious URL identified is https://e.vg/srHvTRglq?. The VBA project, while not containing executable statements directly, is part of the exploit chain. The embedded PDF's purpose appears to be a lure, as indicated by the PDF_IMAGE_ONLY_LURE heuristic.

Heuristics 6

  • OLE2Link / URL Moniker → remote loader — CVE-2017-0199 critical CVE likely CVE_2017_0199
    Document contains an embedded OLE link object whose URL Moniker points to a remote URL. When the host file is opened, Office follows the link, downloads the URL, and processes the response based on its Content-Type (HTA -> mshta.exe, RTF → Word, etc.) — the documented CVE-2017-0199 primitive. The URL extension is not a reliable filter; servers can return different payloads to Office's user agent.
  • Secondary embedded PDF body has suspicious static findings critical POLYGLOT_CHILD_PDF_STATIC_TRIAGE
    A valid PDF body was found at a nonzero offset inside another container and its carved contents matched PDF exploit or lure heuristics. This catches polyglots where the top-level magic routes to ZIP/OLE while a PDF reader or downstream parser opens the hidden PDF payload.
  • VBA project contains no executable statements low OLE_VBA_MACROS
    Document contains a VBA project, but extracted modules only contain attributes/options/comments and no executable statements.
  • External URI info PDF_URI
    PDF contains an external URL action
  • PDF paints image(s) but contains no text operators info PDF_IMAGE_ONLY_LURE
    PDF has 2 image XObject(s) and the content stream contains no text-emitting operators (BT/ET, Tj, TJ, ', ") in either raw bytes or decompressed streams — this is the screenshot-as-PDF pattern used to bypass text-based scanners and to deliver instructions purely through rendered pixels. It is informational unless paired with invisible links or risky URI context.
  • 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 https://e.vg/srHvTRglq?&
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/pdfx/1.3/
    • http://ns.adobe.com/xap/1.0/g/img/
    • http://ns.adobe.com/xap/1.0/sType/ResourceEvent#
    • http://ns.adobe.com/xap/1.0/sType/ResourceRef#
    • http://ns.adobe.com/photoshop/1.0/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
7f506327609c082af1cd37dde23bc2c71a000f7d1ef530b6abb66775040a7673		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 1206 bytes
polyglot_child_pdf_off00001400.pdf
cdce34e9af02b0bb0c23fa196bcfca6e84759346b93a7e969314b72119168ad5		 polyglot-child-pdf Secondary PDF body inside ole container at offset 0x1400 1777664 bytes
polyglot_child_pdf_off00037a00.pdf
f83e698044bac84398ef96cfc9f2b846f08df409514a1bc5e6584b932d799386		 polyglot-child-pdf Secondary PDF body inside ole container at offset 0x37A00 1554944 bytes

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