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

Static analysis result for SHA-256 efc3bd33bc1c97e6…

MALICIOUS

Office (OLE) / .XLS

731.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-06-13
MD5: 7f7d8d99ef33aef4617bb61ff8f5ac50 SHA-1: 6632763ed24db2a490655d7d428039e4b48c136c SHA-256: efc3bd33bc1c97e6d0cb2f36c6732461be3ee9176f101e9c5d2f714669736931
124 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File Execution: Malicious File T1059.001 Command and Scripting Interpreter: PowerShell

The critical heuristic firing for CVE_2017_0199 indicates that the OLE object attempts to load a remote resource from the URL http://109.248.144.244/re/rererererererererererererererere%23%23%23%23%23%23%23%23%23%23%23%23%23%23%23%23%23%23%23rerererererererer.doc. The presence of embedded PDF objects further suggests a multi-stage attack. This indicates a likely attempt to download and execute a secondary payload.

Heuristics 4

  • 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.
  • 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://109.248.144.244/re/rererererererererererererererere%23%23%23%23%23%23%23%23%23%23%23%23%23%23%23%23%23%23%23rerererererererer.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
polyglot_child_pdf_off00008a00.pdf
bf4ca2def8895691110386de135519a1cb975cf3df63bfc643a12ab8ffa6135e		 polyglot-child-pdf Secondary PDF body inside ole container at offset 0x8A00 713216 bytes
polyglot_child_pdf_off00062e00.pdf
9ea2292b30259c8ee00cb157ec65b5627b96507574912b06cc18c57624b29c04		 polyglot-child-pdf Secondary PDF body inside ole container at offset 0x62E00 343552 bytes

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