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

Static analysis result for SHA-256 a0ce8c1e928b233a…

MALICIOUS

Office (OOXML) / .XLSX

2.03 MB Created: 2025-06-12 01:12:31 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2025-08-14
MD5: 566ba2dd818c4464eb650e458ddcccea SHA-1: 9fde5a81d83e88fd498836efae324af496a1a2df SHA-256: a0ce8c1e928b233af868b812d68a736dbad33179d0a2accc5446396f032e0b84
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 Microsoft 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 known vulnerability within Equation Editor. This technique is commonly used to download and execute a second-stage payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/rHmDb2.oj6VuH 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
751d30ab7c134a0d763df4641e7f5f08ce9c8c1348d138d700a158d6c10ec6d1		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/rHmDb2.oj6VuH 2916864 bytes
ooxml_oleobject_00_ole10native_00.bin
0795e38847afb4e8e3b53e9f4a3e88be29f67bdd435ae9149d5776269b9c4943		 ole-package OOXML xl/embeddings/rHmDb2.oj6VuH Ole10Native stream: ole10NaTIVE 2891508 bytes

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