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

Static analysis result for SHA-256 6d2e71a91fa2492e…

MALICIOUS

Office (OOXML) / .XLSX

2.81 MB Created: 2025-09-10 01:57:00 UTC Authoring application: Microsoft Excel 15.0300
MD5: 9c0be142f474306ccaf570f665a4cee4 SHA-1: 68019882e756b8a59e0957615e67f7589da6e6b7 SHA-256: 6d2e71a91fa2492ef090957a717ba53650da22024850232d3c26e323deaab62c
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is a malicious Excel document containing an embedded OLE object, specifically identified as a Microsoft Equation Editor exploit. The high-severity heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream, suggesting it is designed to execute arbitrary code upon opening. The embedded object's structure and size anomaly strongly point towards exploitation for client execution.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/b6SIggRO.c4Rp753 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
4537bfbec1fac323b648f7f99de0c6042d7c7c7ac140027cf191dd75341db5f7		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/b6SIggRO.c4Rp753 2825728 bytes
ooxml_oleobject_00_ole10native_00.bin
a943c234ae13ba332f9ba92afe11e3f640946c3762fd66782fa44826c40f5565		 ole-package OOXML xl/embeddings/b6SIggRO.c4Rp753 Ole10Native stream: OLE10NatIVE 2800774 bytes

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