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

Static analysis result for SHA-256 87347040649e03aa…

MALICIOUS

Office (OLE) / .XLS

700.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-07-24
MD5: 3358e5212bf4e83302f9b7a398cf71a2 SHA-1: 5aacb9e2e94756aa22120615795db8b073d4e2ce SHA-256: 87347040649e03aaafad47aaf8d43843e2956662c7c3040e759bffef76d6539b
134 Risk Score

Malware Insights

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

The sample is an OLE file that exploits CVE-2017-0199 via a URL moniker to load a remote document. The embedded URL points to a suspicious DOC file hosted on an IP address, indicating a likely download and execution chain. The presence of multiple embedded PDFs with suspicious findings further suggests a complex multi-stage attack.

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.
  • 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://109.207.171.30/IBLL/IBLIBLIBLIBLIBLUBLUBUBIBLIBLIBLIBLIBLIBLIBLI%23%23%23%23%23%23%23%23%23%23%23%23%23%23%23%23%23%23%23IBLIBLIBLIBLIBL.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_off00001000.pdf
78ae33117d4b788594874bb539632767fe05e39dc4820a46df99a39820c5e5db		 polyglot-child-pdf Secondary PDF body inside ole container at offset 0x1000 713216 bytes
polyglot_child_pdf_off00006200.pdf
6ada75d01e1f7bb3b48741393693709a37b8d2fbe939e6651b70714fa9b628f4		 polyglot-child-pdf Secondary PDF body inside ole container at offset 0x6200 692224 bytes
polyglot_child_pdf_off00015000.pdf
33cf38960b534ee487e298cee5e638857a4c625c6b4e7561a787633567274bd8		 polyglot-child-pdf Secondary PDF body inside ole container at offset 0x15000 631296 bytes
polyglot_child_pdf_off0002a600.pdf
e3b2fca835daf327b26ead1c222399aad3c930b657f6b30429e1496bf9228c52		 polyglot-child-pdf Secondary PDF body inside ole container at offset 0x2A600 543744 bytes

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