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

Static analysis result for SHA-256 dc6a8e8222b9e12a…

MALICIOUS

Office (OOXML) / .XLSX

2.78 MB Created: 2025-09-10 01:57:00 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2025-09-29
MD5: 6f3289f9cc841850556f2e3dcb79250e SHA-1: 8a4289d4600e5fb872b78a1bbed843fa88909bc7 SHA-256: dc6a8e8222b9e12ad6ab6d08323d3053b26d7d220f64859bb05a4542a403b08b
100 Risk Score

Malware Insights

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

The XLSX file contains 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 designed to exploit a vulnerability. This points to a malicious document intended to deliver a second-stage payload upon opening.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/WMnJ.Qm 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
ec19b2e1bc2da25622d23032ba61819c24b9ce5598728601718608f138f7f2a7		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/WMnJ.Qm 2853376 bytes
ooxml_oleobject_00_ole10native_00.bin
dab7b185e2867a8cdb9016ad2ce9ad70abf5d83a8c3071b8da313d4728f1521b		 ole-package OOXML xl/embeddings/WMnJ.Qm Ole10Native stream: ole10natiVE 2828544 bytes

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