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

Static analysis result for SHA-256 15df77cf2b37b0cb…

MALICIOUS

Office (OOXML) / .XLSX

2.89 MB Created: 2025-09-10 01:57:00 UTC Authoring application: Microsoft Excel 15.0300
MD5: 6dc3e4d6cd3258fee1ab66ae83e6a00e SHA-1: 190aa97a3b5717d43a21688410e1897a9fbd3fc5 SHA-256: 15df77cf2b37b0cbed352caedd9bd71dc564f63a8e286f8ed9cfb3cb00070a03
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an Excel file containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. Heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous size, strongly suggesting it's being used to exploit a vulnerability. This type of exploit typically leads to arbitrary code execution.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/svys.iClu7 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
4475a7d1a9cca084f3854b89eaa1b4302994c5669784d17ae912d637522fd0cd		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/svys.iClu7 2960896 bytes
ooxml_oleobject_00_ole10native_00.bin
ceb49f1e607d8c48f155be8d1bcadffc30fe94c2124abed55c43e074e62d6b55		 ole-package OOXML xl/embeddings/svys.iClu7 Ole10Native stream: ole10NatIVE 2934919 bytes

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