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

Static analysis result for SHA-256 4a65337a5c984cfe…

MALICIOUS

Office (OLE) / .XLSX

689.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-07-04
MD5: 0533afd062eea41e154c89a50b854839 SHA-1: a8477130c474a4dd6855e1204f346e633483df33 SHA-256: 4a65337a5c984cfe5a1545ed5c35866de90fdf2e8c469f1205d337e53595e949
132 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File Execution: Malicious File T1059.005 Command and Scripting Interpreter: Visual Basic

The file is an OLE document that exploits CVE-2017-0199, a known vulnerability for remote code execution. It contains an embedded URL pointing to a secondary document, which is likely the next stage of the attack. The presence of a polyglot PDF further suggests a complex, multi-stage infection chain designed to evade detection.

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 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.
  • 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://107.172.148.208/fbv/x.xx.x.x.doc
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/iX/1.0/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://purl.org/dc/elements/1.1/
    • http://www.iec.ch

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
stream_001_off00000960.bin
2998a126f4fa11ceb265371a5f7968ec18bc4692a32631a544232dc74040021f		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x960 252488 bytes
stream_007_off0002f215.bin
687dc13e09bd40942bfe2843bb5e4d3d7207221c46649b167abab388296f27c6		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2F215 39292 bytes
icc_00_off00038c50.icc
2b3aa1645779a9e634744faf9b01e9102b0c9b88fd6deced7934df86b949af7e		 pdf-icc-profile PDF ICC profile at offset 0x38C50 3144 bytes
polyglot_child_pdf_off00008400.pdf
f10515083373ce54f5beef259c84760c1848ad662a995617c94d60b0ba5ab08c		 polyglot-child-pdf Secondary PDF body inside ole container at offset 0x8400 672256 bytes

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