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

Static analysis result for SHA-256 f1f59fccdcdb6174…

MALICIOUS

Office (OOXML) / .XLSX

309.6 KB Created: 2006-09-16 00:00:00 UTC Authoring application: Microsoft Excel 12.0000
MD5: 752e795f5ddc388bb4137d33bba1616f SHA-1: 787896e3017afda195c07536bd18baa13b7d1801 SHA-256: f1f59fccdcdb61748766bc4533737698056a8531c02b8692ddff61a00290aa4a
110 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1204.001 Malicious Link: Malicious Link T1559 Component Object Model Hijacking T1559.001 Component Object Model Hijacking: Component Object Model Hijacking

The sample is an Excel file containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. Heuristics indicate exploitation of CVE-2018-0798, a vulnerability associated with the Equation Editor. This suggests the file is designed to exploit this vulnerability, likely to download and execute a second-stage payload. No document body text or scripts were extracted, limiting further analysis of the specific payload or delivery mechanism.

Heuristics 5

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/oleObject1.bin contains the Equation Editor CLSID, the legacy component exploited by CVE-2017-11882, CVE-2018-0802, and CVE-2018-0798.
  • CVE-2018-0798 — anomalous Equation Editor native stream high CVE likely CVE_2018_0798_EQUATION_NATIVE_ANOMALY
    Embedded Equation Editor OLE data contains anomalous native stream bytes consistent with a CVE-2018-0798-style Equation Editor exploit. This is treated as likely CVE evidence because the Equation object is malformed and payload-like, but it does not match the exact public matrix-overflow byte signature.
  • Embedded OLE object medium OOXML_OLE_OBJECT
    Document contains an embedded OLE object
  • Hidden worksheet (hidden) low OOXML_HIDDEN_SHEET
    Excel workbook contains 1 hidden sheet(s) — hidden sheets are commonly used to conceal macro code, staging data, or intermediate payload construction
  • 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/rights/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/sType/ResourceRef#
    • http://ns.adobe.com/xap/1.0/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ooxml_oleobject_00.bin
acb304e8870110d9d7d10829a7073768b2fe92002be5e1f102972d629a5924d0		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 4096 bytes
ooxml_oleobject_00_ole10native_00.bin
0917627fa0fbd39147d68b6050f80b8526b84521c006f5919af37299f7464bcc		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: ole10NATivE 1924 bytes
emf_00.emf
3affda63a4ea69d344fca254d325bca59ec58505bf24e5eaee8a147e4a928adc		 ooxml-emf OOXML EMF part: xl/media/image7.emf 1628828 bytes

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