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

Static analysis result for SHA-256 a0bf7a1b9651a41c…

MALICIOUS

Office (OOXML) / .XLSX

2.95 MB Created: 2025-09-10 01:57:00 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2025-12-10
MD5: 0d6af682e66c2226a295aa3e9cfbe957 SHA-1: 1cf6f31377475ea89bd0fe0b52a8dc4d8e5cad3c SHA-256: a0bf7a1b9651a41c33723e160901a7b27a8a871190334e4036dd8c996ad8670a
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 Malicious Link

The sample is an Excel file containing 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 header and size discrepancy, strongly suggesting exploitation of a vulnerability within the Equation Editor component. This is a common delivery mechanism for exploiting CVE-2017-11882.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/HchMA71GB.oA 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
938976df28c91e7ca1d15c24eedd3a49c7587e3491da762155092fea3f78af29		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/HchMA71GB.oA 3049472 bytes
ooxml_oleobject_00_ole10native_00.bin
c0db64d8dcb832ab2fd2e86ffcb128c6412609b486698481d7190206e2478be6		 ole-package OOXML xl/embeddings/HchMA71GB.oA Ole10Native stream: OLE10nAtiVE 3023137 bytes

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