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

Static analysis result for SHA-256 a4c07ef0b7e7eb43…

MALICIOUS

Office (OOXML) / .XLSX

2.16 MB Created: 2025-06-12 01:12:31 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2025-06-28
MD5: 2e98c6f1cedbd16b0417fd09034c0564 SHA-1: 718e49e1f71439f6a0730a53a072f78ae8bed2f6 SHA-256: a4c07ef0b7e7eb4359f50f5cbb0af01c862f81805794c9a5d4759c11b131bf66
100 Risk Score

Malware Insights

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

The file contains an embedded OLE object, specifically identified as a Equation Editor object. High-severity heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous size difference, strongly suggesting exploitation of a vulnerability within the Equation Editor. This is a common delivery mechanism for malicious documents.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/cHuokAc.WwJ contains the Equation Editor CLSID, the legacy component exploited by CVE-2017-11882, CVE-2018-0802, and CVE-2018-0798.
  • Equation Editor object carries payload-like Ole10Native stream high OLE_EQUATION_OLE10NATIVE_PAYLOAD_ANOMALY
    Embedded OLE object declares the Equation Editor CLSID but stores a large high-entropy Ole10Native stream with malformed package sizing. This is an exploit-shaped Equation/OLE payload container seen in malicious OOXML samples. It is not assigned to a specific CVE unless the MTEF/Equation Native primitive also matches.
  • Embedded OLE object medium OOXML_OLE_OBJECT
    Document contains an embedded OLE object

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ooxml_oleobject_00.bin
cdbb7d6a6da7002379add7cde021c5d6a7222883a368f590fd49eec57a309d36		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/cHuokAc.WwJ 3038720 bytes
ooxml_oleobject_00_ole10native_00.bin
0c3e663324f40e50d9549eaf0bf6bf104551b66ab28107cc7c84937de8831c7a		 ole-package OOXML xl/embeddings/cHuokAc.WwJ Ole10Native stream: OlE10NATIve 3012522 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.