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

Static analysis result for SHA-256 b9049cad3dc773d0…

MALICIOUS

Office (OLE) / .XLS

931.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 959656cb9605cec3d3a6071e8451a891 SHA-1: db24895722ea078809e4506fc12b71a81776fed9 SHA-256: b9049cad3dc773d0b4ab4b1526e560060d44c668de2d90ad8884ca7b018d8237
112 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 provided URL. This URL is reconstructed as http://000000ႳႳႳႳႳႳႳႳႳႳႳႳႳႳႳႳႳ=ႭႭႭႭႭႭႭႭႭႭႭႭႭႭႭႭႭႭႭႭႭႭႭႭႭႭႭႭႭ@00015353204525. Additionally, a secondary embedded PDF was found with suspicious static findings, suggesting a multi-stage attack. No VBA macros were found to be executable.

Heuristics 6

  • 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.
  • PDF paints image(s) but contains no text operators info PDF_IMAGE_ONLY_LURE
    PDF has 2 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.
  • 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/xap/1.0/
    • http://ns.adobe.com/xap/1.0/g/img/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/sType/ResourceEvent#
    • http://ns.adobe.com/xap/1.0/sType/ResourceRef#
    • http://ns.adobe.com/photoshop/1.0/
    • http://ns.adobe.com/pdf/1.3/

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
138e7ccc3896e8b3cb0f49ebe129820661eed599eb830f18eade2955224b21d4		 ole-package OLE Ole10Native stream: MBD0230DE64/Ole10Native 910492 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact entropy is 7.85, consistent with packed or encrypted content.
icc_00_off00000545.icc
3f6d674174f3804eb0dabdac90ae17486e898c5063a66f861c116ea033da8301		 pdf-icc-profile PDF ICC profile at offset 0x545 3144 bytes
polyglot_child_pdf_off000024ef.pdf
ca6b8ccc4e4dbb89e7048ee909d5751329138fb853560253584615395a894904		 polyglot-child-pdf Secondary PDF body inside ole container at offset 0x24EF 944401 bytes

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