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

Heuristics 8

• 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.
• TrueType bitmap font + active content — CVE-2023-26369 related high CVE related PDF_CVE_2023_26369_RELATED
  PDF embeds a TrueType font with bitmap tables (EBDT/sbix/CBDT) alongside exploit delivery indicators — CVE-2023-26369 exploits the sfac_GetSbitBitmap function in Adobe's libCoolType for arbitrary code execution. This CVE was actively exploited in the wild, but this rule does not validate the malformed EBLC/EBDT primitive.
• 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 low PDF_URI
  PDF contains an external URL action
• 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.
• 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 http://104.168.46.25/FNF/3/0000Oo0oOOOO0o0ooO0Oo0o0o000000000%23%23%23%23%23%23%23%23%23%23%23%23%23%23000000000000000000%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/
  • https://docs.microsoft.com/typography/abouthttp://lucasfonts.comMicrosoft
  • http://en.wikipedia.org/wiki/MIT_License
  • http://crl.microsoft.com/pki/crl/products/MicrosoftTimeStampPCA.crl0X
  • http://www.microsoft.com/pki/certs/MicrosoftTimeStampPCA.crt0
  • http://www.microsoft.com/pkiops/crl/MicCodSigPCA2011_2011-07-08.crl0a
  • http://www.microsoft.com/pkiops/certs/MicCodSigPCA2011_2011-07-08.crt0
  • http://crl.microsoft.com/pki/crl/products/microsoftrootcert.crl0T
  • http://www.microsoft.com/pki/certs/MicrosoftRootCert.crt0
  • http://crl.microsoft.com/pki/crl/products/MicRooCerAut2011_2011_03_22.crl0^
  • http://www.microsoft.com/pki/certs/MicRooCerAut2011_2011_03_22.crt0��
  • http://www.microsoft.com/pkiops/docs/primarycps.htm0@
  • http://www.microsoft.com/Typography
  • http://www.microsoft.com/typography/ctfontshttp://www.fonts.comMicrosoft
  • http://www.microsoft.com/typography/fonts/default.aspx

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