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

Static analysis result for SHA-256 f3f74809b819eab4…

MALICIOUS

Office (OLE) / .XLS

1.86 MB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: ae41ad75005ce078dae7a3136ce60f14 SHA-1: 4c2d04bc99d3d9ac3f80955f40d47243411dd42f SHA-256: f3f74809b819eab48dc4212c2b161c9d306814418d232a25ff558f4d720ede3e
108 Risk Score

Malware Insights

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

The critical heuristic firing indicates exploitation of CVE-2017-0199 via an OLE2Link object, which attempts to load a remote URL. The embedded URL 'https://peprolinbot.es/uAADj2?&ankle' is highly suspicious and likely serves as a loader for a second-stage payload. An additional embedded URL 'https://arpo-sa.com/' was also found. The presence of a polyglot PDF with suspicious findings further supports a multi-stage attack. No VBA macros were found to be executable, but the core exploit mechanism is clear.

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.
  • 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.
  • 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://arpo-sa.com/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
7f506327609c082af1cd37dde23bc2c71a000f7d1ef530b6abb66775040a7673		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 1206 bytes
font_00_sfnt_off000010ab.bin
41c2901ebda5b5d79d4a68e71278578ac4fe004bea942385b0ed0c502c07b584		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB 88240 bytes
polyglot_child_pdf_off00136a00.pdf
d69701c9bcce2aa047ff3dec935e0f7230ec306c23e254ca01cdffc0d4573f65		 polyglot-child-pdf Secondary PDF body inside ole container at offset 0x136A00 678400 bytes

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