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

Static analysis result for SHA-256 434d5d4795bc3eaa…

MALICIOUS

Office (OLE) / .XLS

1.42 MB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: c99258e7df2ac4fc431b47a99e3d830f SHA-1: 5cf1ed706d3b0dab1ef0a6f9324d3437b1850c51 SHA-256: 434d5d4795bc3eaafd4349ddcce4ef78d299212cdc47e136f96d943ab4539dc3
128 Risk Score

Malware Insights

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

The critical heuristic 'CVE_2017_0199: OLE2Link / URL Moniker' indicates the file exploits a known vulnerability to load remote content. The embedded URL 'https://nucleo.ooo/MYvPQT' is highly suspicious and likely serves as the initial download source for a secondary payload. The presence of a polyglot PDF with suspicious static findings further suggests a multi-stage attack.

Heuristics 3

  • 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.

Extracted artifacts 2

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_off0006e200.pdf
e0c7010140c64e5d51ee846a3162db9d3edd72024856f8b541c55d31a95c7ad6		 polyglot-child-pdf Secondary PDF body inside ole container at offset 0x6E200 1038848 bytes

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