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

Static analysis result for SHA-256 e4e930c0a19f6037…

MALICIOUS

Office (OLE) / .XLSX

872.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-08-22
MD5: 0883e71d29dfd7dcada18f895701d261 SHA-1: 8a58459ac6ed115407f910a30047f38187e1ee68 SHA-256: e4e930c0a19f60376adfcb308625a50157f9960cd1331b2d4bea01bf3d2cd4f4
114 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1059.005 Visual Basic

The critical heuristic firing for CVE-2017-0199 indicates the sample is designed to exploit this vulnerability via an OLE object to load a remote resource. The embedded URL points to a potential second-stage payload. The presence of multiple embedded PDFs, one of which is flagged as a lure, further suggests a multi-stage attack designed to deceive the user and deliver malicious content.

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 high 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.
  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://192.210.175.4/780/doc/00o0o0oo0o0oO0O0Oo0O00O0o0o00o000o0o0O0000000%23%23%23%23%23%23%23%23%23%23%23%23%23%230000000000000%23%23%23%23%23%23%23%23%23%23%23%23%23%2300000000000.dOC
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/pdf/1.3/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/mm/

Extracted artifacts 5

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_off0004b400.pdf
3bab1bc431c3f29e050a777d1f748369daac32926aa7399e5b410e24f33f4d1f		 polyglot-child-pdf Secondary PDF body inside ole container at offset 0x4B400 585216 bytes
polyglot_child_pdf_off00001000.pdf
08cc153a4f49379adfc8df6d5c2a23affd42e19cd771b1b9dbbacfdd66c6dccd		 polyglot-child-pdf Secondary PDF body inside ole container at offset 0x1000 889344 bytes
polyglot_child_pdf_off00006200.pdf
2468264a5d2e2eff1cdf0288ab50afec2bb747c854497f68c968630ca9484ea7		 polyglot-child-pdf Secondary PDF body inside ole container at offset 0x6200 868352 bytes
polyglot_child_pdf_off00074600.pdf
23fac9367264d5055809b3db700bc4b522aff43549a135113a8a924f33103c1a		 polyglot-child-pdf Secondary PDF body inside ole container at offset 0x74600 416768 bytes

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