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

Static analysis result for SHA-256 421895be443167f7…

MALICIOUS

Office (OLE) / .XLSX

937.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: b01b76c877321d03dab23c4d1bb26e48 SHA-1: faf698726f93f31fc1fcab31e8942d690220fa10 SHA-256: 421895be443167f773741e1681d27ba2052fbef90d4def330cadb3206dbd651c
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 resource from the URL 'https://gacorbos.me/oDeZnN?&gear=grieving&dishwasher=imported&lion=sedate&buyer'. This suggests the file acts as a downloader for a second-stage payload. The presence of a VBA macro, though not executable, and an embedded PDF with suspicious static findings further support a malicious intent, likely to deliver malware.

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 http://www.wowform.com
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • 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
macros.bas
7f506327609c082af1cd37dde23bc2c71a000f7d1ef530b6abb66775040a7673		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 1206 bytes
polyglot_child_pdf_off00076e00.pdf
6fe1e4f8e3628b5df881743ee4f17e06178eca6ba20b01a3ae304c4a6041e843		 polyglot-child-pdf Secondary PDF body inside ole container at offset 0x76E00 473088 bytes

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