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

Static analysis result for SHA-256 90a268cc0130f94d…

MALICIOUS

Office (OLE) / .XLSX

872.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-08-22
MD5: e5e74d64e80b60bc66bea1e42563785b SHA-1: c4c5b357ede7798d494ea9fa9642a4cbd4836fae SHA-256: 90a268cc0130f94d728bc9d2b617fae81779de2f4e4956a42fef6961ea7f1c51
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 that the OLE object attempts to load a remote resource from the URL http://192.210.175.4/receipt_232/2/0oO0O0O0O0Oo0o000O0O0O0O0O000%23%23%23%23%23%23%23%23%23%23%23O0o0o0O0o0o0OO0o0o0000O000%23%23%23%23%23%23%23%23%23%23%23%23%23%2300000000000.dOC. Although no VBA code was found to be executable, the presence of embedded PDF files and the CVE exploit suggest a downloader or dropper functionality. The embedded PDF files themselves contain suspicious static findings, including image-only lures.

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/receipt_232/2/0oO0O0O0O0Oo0o000O0O0O0O0O000%23%23%23%23%23%23%23%23%23%23%23O0o0o0O0o0o0OO0o0o0000O000%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
e55d473bda52feae7db5128b4324fe375fc6d287e70e1ea5a8fcc09a8c797eeb		 polyglot-child-pdf Secondary PDF body inside ole container at offset 0x4B400 585216 bytes
polyglot_child_pdf_off00001000.pdf
d456b71b2ad3a1ddfd5d05dcbeb10abc93df207ea087eb5f946e49f0b7af9e2e		 polyglot-child-pdf Secondary PDF body inside ole container at offset 0x1000 889344 bytes
polyglot_child_pdf_off00006200.pdf
d60d42773bd6ed23117c80c14124fde38c75e7fb6c74c61bbbf011e28c75132d		 polyglot-child-pdf Secondary PDF body inside ole container at offset 0x6200 868352 bytes
polyglot_child_pdf_off00074600.pdf
083fb42b4bf967f0e58fad92d3b444ad5cf2c235668e7cd9cccca2663bc5fa83		 polyglot-child-pdf Secondary PDF body inside ole container at offset 0x74600 416768 bytes

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