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

Static analysis result for SHA-256 640f085bee17f934…

MALICIOUS

Office (OOXML) / .XLSX

2.55 MB Created: 2025-09-04 00:14:20 UTC Authoring application: Microsoft Excel 12.0000
MD5: f8b3a15c9194c02e9488fc5d84fae887 SHA-1: 96e1cfdc4fb0da3427571bfbd7c30a48e132b0a7 SHA-256: 640f085bee17f934ba2130833a8d9355acadad7048eea4aa98ba3a7100dc857f
140 Risk Score

Malware Insights

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

The sample is an Office document containing an embedded OLE object that exploits the CVE-2017-11882 vulnerability in the Equation Editor. This vulnerability allows for arbitrary code execution, which is a common method for delivering secondary payloads. The document also contains a lure to enable macros, further indicating malicious intent.

Heuristics 4

  • 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/UN2mE.qo0J 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
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ooxml_oleobject_00.bin
66e0384f52c6f3f933c8e7bcb061680792d6a3df7221b721ceaadc9ae447e67a		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/UN2mE.qo0J 3017728 bytes

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