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

Static analysis result for SHA-256 f1c84d94578f6b9e…

MALICIOUS

Office (OOXML) / .XLSX

2.80 MB Created: 2025-09-10 01:57:00 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2026-02-27
MD5: 0baa6a0fb2372c597f16ff0b02e3a823 SHA-1: 1ffeffe8013072838991292bead2d97a9e1baf9c SHA-256: f1c84d94578f6b9eddb92ec17e17d289de7bcdcd26eb5d1ced114a8d9c4e96d6
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 Malicious Link

The sample is an Office document 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 designed to exploit a vulnerability. This is a common delivery mechanism for malware, often initiated via spearphishing attachments.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/tAGw.wWi 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
f46715fa43c56d66a71a762d13c7c096169c223058ceb2010de5bafb5009ea60		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/tAGw.wWi 2819584 bytes
ooxml_oleobject_00_ole10native_00.bin
4751a30dbdd357ed6cfb7e3d3fff8cdd33dd1b967171009603e349d32296c026		 ole-package OOXML xl/embeddings/tAGw.wWi Ole10Native stream: OLE10NAtive 2794711 bytes

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