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

Static analysis result for SHA-256 41a546268685b493…

MALICIOUS

Office (OOXML) / .XLSX

3.21 MB Created: 2025-10-08 01:54:00 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2026-01-30
MD5: 4dc1b07fee8390bc201fb63c4350c0cd SHA-1: d6c07dbb5e5b0601aab5e672d54e77e93b16d655 SHA-256: 41a546268685b493e2d3b7596c9998614da962335950d02504468d3e79d3484d
120 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 an Equation Editor object. Heuristics indicate a critical vulnerability, CVE-2017-11882, which is a FONT record overflow. This vulnerability allows for exploitation for client execution, likely to download and run a second-stage payload.

Heuristics 3

  • 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/LXbzim6xc.VT3q8 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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ooxml_oleobject_00.bin
81e2b04d4fa6c0c61e9a4681ba66368f7fac89073810440a2194bad81c7c8e4d		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/LXbzim6xc.VT3q8 2892288 bytes

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