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

Static analysis result for SHA-256 d986c4d64650cdbb…

MALICIOUS

Office (OLE) / .XLSX

739.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-08-20
MD5: 91f14274d989b1196535cff8bf5db843 SHA-1: 9ab6fded01f1c0178506ac601c56370db6d2beb1 SHA-256: d986c4d64650cdbb34bfbe5133846627db098f37f6c757d615f511d5a794507a
112 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, likely to download a secondary payload from the specified URL. The embedded PDF, while containing only images, further suggests a lure or obfuscation technique. No VBA macros were found to be executable, but the presence of the CVE exploit is the primary indicator of malicious intent.

Heuristics 5

  • 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.
  • 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/Quotation/00O0o0O0o0O0o0O0o0o0000o0Oo0o0o00O00000o000000%23%23%23%23%23%23%23%23%23%23%23%23%23%2300000000%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 4

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_off0003f600.pdf
8b2d995710b4dc72dc506afa190430f63789166fd7729f04c7e37593f4b856b9		 polyglot-child-pdf Secondary PDF body inside ole container at offset 0x3F600 497664 bytes
polyglot_child_pdf_off00001000.pdf
4db443098f52640d819d4fae471be53da68842c5e96ff5f858b6f678d8df58f2		 polyglot-child-pdf Secondary PDF body inside ole container at offset 0x1000 753152 bytes
polyglot_child_pdf_off00063e00.pdf
9d1a1da2dcba956776927ddf44a4f082891d1dda2a34fba834baa6b8d9d6b720		 polyglot-child-pdf Secondary PDF body inside ole container at offset 0x63E00 348160 bytes

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