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

Static analysis result for SHA-256 19c6aa014138c287…

MALICIOUS

Office (OOXML) / .XLSX

3.45 MB Created: 2025-10-08 01:54:00 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2026-02-05
MD5: 3e388f409daa3bd93be9f6911786b33a SHA-1: 975fe44bf6ccfadd3c519543d0fd9468c30fb27e SHA-256: 19c6aa014138c287046d611ae8cdd77803a8251fe63b8174aeb085da1a2e0f90
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 a vulnerable Equation Editor object. Heuristics indicate a critical vulnerability, CVE-2017-11882, which is a font record overflow. This vulnerability allows for arbitrary code execution when the embedded object is activated. The embedded OLE object itself is listed as an IOC.

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/IpQxWr.Ga1 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
0552dab921873ae3993e0408e2e651833d59eee1720c447664404be027316bbc		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/IpQxWr.Ga1 2905088 bytes

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