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

Static analysis result for SHA-256 17392f784da160b2…

MALICIOUS

Office (OOXML) / .XLSX

650.1 KB Created: 2004-09-16 12:33:58 UTC Authoring application: Microsoft Excel 15.0300
MD5: b59632652724734202aae264fb6d4b4e SHA-1: ec547f322abb979054f9536d015e09758d5c514b SHA-256: 17392f784da160b2e0a8d24937b6d126afecb4b7fd582954c76ca59385d3f940
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The file contains an embedded OLE object, specifically identified as a Microsoft Equation Editor object. Heuristics indicate that this object carries a payload-like Ole10Native stream with an anomalous header and size discrepancy, strongly suggesting exploitation of a vulnerability within the Equation Editor. This is a common technique for delivering secondary payloads.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/WYj.yOv8 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
6c5a81abecdf601b13d47bc4df50013cf4f14ea8653a35298933af8439ec288e		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/WYj.yOv8 803328 bytes
ooxml_oleobject_00_ole10native_00.bin
b6327b287f7aa0fd5aad21817da9f9c94be89cefcdadd4b60f8470cc3cee09c4		 ole-package OOXML xl/embeddings/WYj.yOv8 Ole10Native stream: oLE10NaTiVE 794504 bytes

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