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

Static analysis result for SHA-256 4153a193ab84784b…

MALICIOUS

Office (OLE) / .XLSX

1.48 MB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 37d8f0f84e01f756f77668692ba04548 SHA-1: b372cd2ca3861018ae802e7080e6b45095589461 SHA-256: 4153a193ab84784b9598abbccfced650662a66d6dfdc1003ce37198c056a5b22
146 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1059.001 PowerShell T1059.005 Visual Basic T1059.007 JavaScript

The sample leverages the CVE-2017-0199 vulnerability, which is known to be used for remote code execution. The embedded URL 'https://sayakale.me/BYoReV?&' strongly suggests a downloader or droppper functionality. The presence of JavaScript within an embedded PDF, along with static analysis findings for OLE2Link and URL Moniker, further supports the attack pattern of exploiting a known vulnerability to fetch and execute a remote payload.

Heuristics 7

  • 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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.
  • 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://sayakale.me/BYoReV?&
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/pdf/1.3/
    • http://purl.org/dc/elements/1.1/

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
7f506327609c082af1cd37dde23bc2c71a000f7d1ef530b6abb66775040a7673		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 1206 bytes
javascript_obj0008_000.js
c107e778ab4a398286cc20268a8634acdaad05b60d09373ea48e473c677ee2bd		 pdf-javascript-stream PDF /JS object 8 at offset 0xB2B 128 bytes
javascript_obj0009_001.js
ce85e5fc4815c2d4f886c67d0c94509d79aacac2ad98d0c6d8c1653af52b5a9c		 pdf-javascript-stream PDF /JS object 9 at offset 0xBD3 120 bytes
font_00_sfnt_off000067a4.bin
4928986ac45257f9a6092f8ca647ac7eb70cf6a8588c941c83838d1427d87f99		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67A4 57092 bytes
polyglot_child_pdf_off00000e00.pdf
55419d256a805acd96d79b8700a9c775bf53836bc627bdafdfc7d5eeb4045f4f		 polyglot-child-pdf Secondary PDF body inside ole container at offset 0xE00 1551360 bytes
polyglot_child_pdf_off0000e200.pdf
4758616767a832c18ecc568f3d8f2440156b42abcf185a10ef129c9e09e27d81		 polyglot-child-pdf Secondary PDF body inside ole container at offset 0xE200 1497088 bytes

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