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

Static analysis result for SHA-256 005682dba62a836d…

MALICIOUS

Office (OOXML) / .XLSX

3.46 MB Created: 2025-10-08 01:54:00 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2026-02-05
MD5: 532ecbd8dd80dad064d185bcb7ea59e9 SHA-1: ec9cd5cdee0e64c1cd415b1e3f5319d6aba9d733 SHA-256: 005682dba62a836d6ea2a85af86276f1c414c48204a00b911a2fe23fbbc7fd16
120 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The critical heuristic firing for CVE-2017-11882 indicates the file contains an Equation Editor OLE object that exploits a known vulnerability. This vulnerability allows for arbitrary code execution, likely to download and run a second-stage payload. The embedded OLE object is the primary indicator of compromise.

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/4OKlz8pGf.CxKoEB 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
40d69fdbe0d598cc67d4d8fc05385dc4df131841d196d2e51d29bdc1166d1202		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/4OKlz8pGf.CxKoEB 3107840 bytes

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