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

Static analysis result for SHA-256 0b4c835261c35cce…

MALICIOUS

Office (OOXML) / .XLSX

2.19 MB Created: 2025-06-16 01:57:26 UTC Authoring application: Microsoft Excel 12.0000
MD5: da851876fdfb9786edbfb82366bd08f8 SHA-1: 2266ca9b1fc8846db812d7df0894d52ff5d6a1d6 SHA-256: 0b4c835261c35ccebea495071cc69fc298334646f5d435be2f59d107863a14d7
120 Risk Score

Malware Insights

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

The critical heuristic firing for CVE-2017-11882, combined with the presence of an embedded Equation Editor OLE object, strongly indicates exploitation of this known vulnerability. The embedded OLE object is likely a payload designed to execute arbitrary code, making this a malicious document delivered via spearphishing.

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/kmC.Q4W1ACP 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
ed882d999ec37a9c4af069560b02ae7de633eebf96606bb3a8a3d26198748e93		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/kmC.Q4W1ACP 3104256 bytes

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