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

Static analysis result for SHA-256 c837cd333504d4cb…

MALICIOUS

Office (OOXML) / .XLSX

3.52 MB Created: 2025-10-08 01:54:00 UTC Authoring application: Microsoft Excel 12.0000
MD5: deab8d95471d9edd4162404cf0f5f1de SHA-1: 8910a07e9b1ddfd44024ec1c593ae4bdeeb59eff SHA-256: c837cd333504d4cbd41bcf77c4640f16415f39eea2446309556b144f6dea5050
80 Risk Score

Malware Insights

MITRE ATT&CK
T1204 User Execution: Malicious Link T1566 Phishing T1566.001 Spearphishing Attachment

The file is an Excel document containing an embedded OLE object, specifically identified as an Equation Editor object. The presence of a 'macro/content-enable lure' heuristic indicates the document likely prompts the user to enable content, a common tactic for malware droppers. This suggests the embedded OLE object is intended to be executed upon user interaction, leading to a malicious payload delivery.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/5N0j9o2qS.0f7 contains the Equation Editor CLSID, the legacy component exploited by CVE-2017-11882, CVE-2018-0802, and CVE-2018-0798.
  • 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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ooxml_oleobject_00.bin
4323785be9e61f51c3c28c2863b9f00437c7ce7f83068606db0b7f4f0001181c		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/5N0j9o2qS.0f7 3078656 bytes

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