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

Static analysis result for SHA-256 de88470edbcfaff3…

MALICIOUS

Office (OOXML) / .XLSX

2.16 MB Created: 2025-06-12 01:12:31 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2025-07-17
MD5: 925f2fb618ffd8b5fad3b083648ed1a5 SHA-1: 68a3ceb195efc1b0c765f6769bbb2c071938d55d SHA-256: de88470edbcfaff3c55928fa29617c31bbcaab37e8ef25993ecd4c6f3623dc35
100 Risk Score

Malware Insights

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

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 exploit a vulnerability. The embedded object's filename and stream name are noted as potential IOCs.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/J0yghPM.Qk1DSTZ 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
c1c76eaa0661eeee20b3964ab5bd751655e0cebb20aceb6cf5399593b3f50014		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/J0yghPM.Qk1DSTZ 3086336 bytes
ooxml_oleobject_00_ole10native_00.bin
c79b26b050c9a5133ef2e71906684a50e8fe0216632282c9767fab461a4b9ff2		 ole-package OOXML xl/embeddings/J0yghPM.Qk1DSTZ Ole10Native stream: ole10nATivE 3059309 bytes

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