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

Static analysis result for SHA-256 59873f7c133a776b…

MALICIOUS

Office (OOXML) / .XLSX

2.85 MB Created: 2025-09-10 01:57:00 UTC Authoring application: Microsoft Excel 15.0300
MD5: 6c139af6084e46e902fb4bab3c654649 SHA-1: 5db9268c81c285e1f6d5aeb4aea1eba76c752ba4 SHA-256: 59873f7c133a776b19dbfc11aa132d70f2e2fe57cf0b7f4dcaa80fc101fb0e06
60 Risk Score

Malware Insights

MITRE ATT&CK
T1559.001 Component Object Model Hijacking

The high-severity heuristic firing for an Equation Editor OLE object strongly suggests this XLSX file is designed to exploit a vulnerability within the Equation Editor component. This is a common technique for delivering secondary malicious payloads, often leading to remote code execution.

Heuristics 2

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/kSOGiekd.oOWl 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ooxml_oleobject_00.bin
083b29e7026d4a08e480cd2a7d16f152de33c3fd1fbb791297fb75466f6d1c7c		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/kSOGiekd.oOWl 2918912 bytes
ooxml_oleobject_00_ole10native_00.bin
72ce368da2ba196e2eadcef93963a9bf7d3d4fd220fbe7a7cbf71063515f58c6		 ole-package OOXML xl/embeddings/kSOGiekd.oOWl Ole10Native stream: olE10nAtIvE 2893799 bytes

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