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

Static analysis result for SHA-256 e0036d495010940e…

MALICIOUS

Office (OOXML) / .XLSX

2.43 MB Created: 2025-09-04 00:14:20 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2025-10-16
MD5: 7b888ecc38d1bc6779671e7874453c0e SHA-1: 136d01a3497c31854b839e4a1257e6454125f7e8 SHA-256: e0036d495010940ed1d98504a468d1011fa488965257a2f84fdd74280c991542
120 Risk Score

Malware Insights

MITRE ATT&CK
T1204 User Execution: Malicious Link T1566.002 Phishing: Spearphishing Attachment

The file is an Office document containing an embedded OLE object, specifically an Equation Editor object that carries a payload-like Ole10Native stream. Heuristics indicate a lure to enable macros or editing, a common technique for malware droppers. The embedded OLE object's unusual stream size and header suggest it is not a legitimate equation but rather a packed or obfuscated payload.

Heuristics 4

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/DsYSAGy.IHzr 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
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ooxml_oleobject_00.bin
c4df16c10053bbb26932838311f31f873fc2bab72c821c2c8d7b9f6a21ef36fb		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/DsYSAGy.IHzr 2824704 bytes
ooxml_oleobject_00_ole10native_00.bin
e96b184123ff4277cc7838f2fb510ee3a67c408af087a095688362aa2b15a509		 ole-package OOXML xl/embeddings/DsYSAGy.IHzr Ole10Native stream: olE10NaTivE 2800090 bytes

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