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

Static analysis result for SHA-256 d6a52b360155c240…

MALICIOUS

Office (OOXML) / .XLSX

2.78 MB Created: 2025-09-10 01:57:00 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2025-12-23
MD5: 70404392e151c2e2f3c3e913792ae92f SHA-1: 997b1dc61c6bc93ed8d7f107901126a8acc23378 SHA-256: d6a52b360155c240c26d52a7b0fe03c20bf188fd0a3f93117b7a45c5312cd372
100 Risk Score

Malware Insights

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

The file is an OOXML document containing an embedded OLE object, specifically identified as a Equation Editor object. High-severity heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous size, strongly suggesting it's used to exploit a vulnerability. This is a common technique for delivering second-stage malware.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/gVz.QZDPA 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
f7a44f87679194b4748af305462f5d7a5999403c18e627176ea185d4921fac05		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/gVz.QZDPA 2824192 bytes
ooxml_oleobject_00_ole10native_00.bin
7d4f0cb906bef0b4b63f1ef778737989b7dea8d06b3f94d313b3b6f4b9107ebf		 ole-package OOXML xl/embeddings/gVz.QZDPA Ole10Native stream: OlE10natiVe 2799342 bytes

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