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

Static analysis result for SHA-256 188b3dcc9075ee5f…

MALICIOUS

Office (OLE) / .XLS

583.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: bcd4adc9d13063ae0905a3d04dcf86d6 SHA-1: eb84a5a44c2b22554dcc5efbbb03fda695941f34 SHA-256: 188b3dcc9075ee5fc5e2fc712ad4017d7e4977dedc8d2131d6b2ebe892ff416d
104 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The file is an OLE2Link object that exploits CVE-2017-0199, a known vulnerability for remote code execution. It attempts to download a secondary payload from the URL https://dealc.me/nvlJTm. The presence of an embedded PDF with suspicious static findings further indicates malicious intent, likely as a lure or part of a multi-stage attack.

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 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.
  • PDF paints image(s) but contains no text operators info PDF_IMAGE_ONLY_LURE
    PDF has 1 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 https://dealc.me/nvlJTm

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
polyglot_child_pdf_off00080800.pdf
d1ef1731053d3b65ca8ed3bdc8ac37cf0c682550700125d7f413070e03ef72d1		 polyglot-child-pdf Secondary PDF body inside ole container at offset 0x80800 71168 bytes

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