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

Static analysis result for SHA-256 da6a5630b48312bc…

MALICIOUS

Office (OOXML) / .XLSX

633.5 KB Created: 2022-06-01 11:53:05 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2022-06-06
MD5: 0078d9a95d1ba6388835852a28608a1f SHA-1: 32cce795bd5c00eb12ab0424f030b91793d314a9 SHA-256: da6a5630b48312bcdfa5ae70cca216b6c446616681006cc04fb820af4da2750d
120 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1559.001 Component Object Model Hijacking

The sample is an Office Open XML (XLSX) file containing an embedded OLE object. Heuristic analysis indicates a critical vulnerability, CVE-2017-11882, related to the Equation Editor component. This exploit is commonly used to execute arbitrary code, suggesting the file is designed to deliver a secondary malicious payload. No specific family could be identified, and no further IOCs were extracted.

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/8UfZ.sPq 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
b799b6f70b18110a19e33cbc72a3ff9f7a0afaf1f8ee98ea36cf2c866e391472		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/8UfZ.sPq 874496 bytes

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