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

Static analysis result for SHA-256 f32a8e0295de30c3…

MALICIOUS

Office (OOXML) / .XLSX

654.7 KB Created: 2023-08-03 11:34:29 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2024-08-18
MD5: e0650ca2fa67613c0265d295db68525f SHA-1: 37bc17097c8b16352f38958a85a5d9d6f2b6f1de SHA-256: f32a8e0295de30c3533403ce5595820fd29189102800caa56f7a275955d5dcfb
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The sample is an OOXML file containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. High-severity heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous header, suggesting it's being used to deliver a secondary exploit or payload. The presence of an embedded OLE object and the nature of the anomaly strongly point towards exploitation of a vulnerability within the Equation Editor component.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/rq6Q5MDEO.GStj7tk contains the Equation Editor CLSID, the legacy component exploited by CVE-2017-11882, CVE-2018-0802, and CVE-2018-0798.
  • Equation Editor object carries payload-like Ole10Native stream high OLE_EQUATION_OLE10NATIVE_PAYLOAD_ANOMALY
    Embedded OLE object declares the Equation Editor CLSID but stores a large high-entropy Ole10Native stream with malformed package sizing. This is an exploit-shaped Equation/OLE payload container seen in malicious OOXML samples. It is not assigned to a specific CVE unless the MTEF/Equation Native primitive also matches.
  • Embedded OLE object medium OOXML_OLE_OBJECT
    Document contains an embedded OLE object

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ooxml_oleobject_00.bin
8599d396197f55abc39af248745c7c0e989c254dcc7d7d2c29cd36e246e0e061		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/rq6Q5MDEO.GStj7tk 942080 bytes
ooxml_oleobject_00_ole10native_00.bin
2bd68002b7a9bfd2ce7bcca5c6981ee7e6d3fdb82d986601532762a65a9cc131		 ole-package OOXML xl/embeddings/rq6Q5MDEO.GStj7tk Ole10Native stream: oLe10naTIVE 932334 bytes

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