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

Static analysis result for SHA-256 02687293457b7fd3…

MALICIOUS

Office (OOXML) / .XLSX

2.30 MB Created: 2025-09-04 00:14:20 UTC Authoring application: Microsoft Excel 12.0000
MD5: e9b60ae40bcacc9bd8faea77964247e1 SHA-1: 777b35aeec7a853aba2996dac73f886bd5fe17a9 SHA-256: 02687293457b7fd3f8d29fc05f33c109dd83a223dfbadf69b7e9d5eeabd25731
140 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The sample is an Office document containing an embedded OLE object, specifically an Equation Editor object. Heuristics indicate a critical vulnerability, CVE-2017-11882, is being exploited through a FONT record overflow within this object. The document also contains a lure to enable macros or editing, suggesting it is designed to facilitate the execution of malicious code. The embedded OLE object's filename is also listed as an IOC.

Heuristics 4

  • CVE-2017-11882 — Equation Editor FONT record overflow critical CVE likely CVE_2017_11882
    Equation Editor MTEF contains an overlong FONT typeface field, the vulnerable copy primitive for CVE-2017-11882. This is stronger evidence than the Equation Editor CLSID alone because it identifies the malformed record that drives code execution in EQNEDT32.EXE.
  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/bh.1ovJO 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
492557534e7f292d8552ee40f2d6740912c2b240eaecfa5ab942e8981e057457		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/bh.1ovJO 2981376 bytes

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