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

Static analysis result for SHA-256 f554637fbc612e57…

MALICIOUS

Office (OLE) / .XLS

446.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: f5c9de6c7141536453944f1ff70d6737 SHA-1: d548e0af61669d2680a4d1cb71ce17143fed1495 SHA-256: f554637fbc612e5703437c4f8458f8269d505e6e3a08af0bdebc096020d69150
110 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1059.001 PowerShell

The critical heuristic firing indicates exploitation of CVE-2017-0199 via an OLE2Link object, which attempts to download a remote payload from the URL 'http://0030603051511/httpswww.microsoft.comen-usmicrosoft-365wordms.officeurl=word&ocid=cmmiq.php'. The presence of an embedded PDF with suspicious static findings further suggests a multi-stage attack. The VBA macros were present but contained no executable statements, indicating they are not the primary infection vector.

Heuristics 5

  • 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.
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • 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.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/pdf/1.3/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
7f506327609c082af1cd37dde23bc2c71a000f7d1ef530b6abb66775040a7673		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 1206 bytes
ole10native_00.bin
88806127cf1876402896112cb254562624fe1bbad0e605ba2131a536f4745647		 ole-package OLE Ole10Native stream: MBD01C40A1B/Ole10Native 38085 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact entropy is 7.93, consistent with packed or encrypted content.
stream_006_off0000be09.bin
f3175a5c6c9d0f8a85c5a6f93d1f56198dfd0a62dcf8fbe9f723870754d9d5a4		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xBE09 352784 bytes
polyglot_child_pdf_off0000ae00.pdf
a81d98bb4c432052eebcf201cd33637e50d92a255c5e3061f5248eb69e6b6098		 polyglot-child-pdf Secondary PDF body inside ole container at offset 0xAE00 412160 bytes

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