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

Static analysis result for SHA-256 0b9c22b11682da78…

MALICIOUS

Office (OOXML) / .XLSX

2.19 MB Created: 2025-08-06 23:16:59 UTC Authoring application: Microsoft Excel 12.0000
MD5: 291aee118d98edb5577357d5d74f07cb SHA-1: 29ed8cac8b468ff5b0b91c4162f0f6085c59d68c SHA-256: 0b9c22b11682da780e52f098c6fcd8fcb9da06a6ba4894f93add1486789a6a6d
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 indicates that the sample exploits a known vulnerability in Microsoft Equation Editor. This vulnerability allows for arbitrary code execution, which is a common method for delivering malicious payloads. The presence of an embedded OLE object further supports this finding. The document body content appears to be a list of items, likely a lure, but does not provide direct instructions.

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/fTU.B4b 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
e57054221443defe926f9cc69e2f29f81dad77c1b616deb79838629f1ec021d5		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/fTU.B4b 3079680 bytes

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