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

Static analysis result for SHA-256 7a95a6daa8078f47…

MALICIOUS

Office (OOXML) / .XLSX

604.7 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-08-17
MD5: f39db0d32741874c621972941dd69944 SHA-1: e8073ad14e10e7836e0477eadcf9609d556048d6 SHA-256: 7a95a6daa8078f47d347bf4962bddea27ca22117c6882e603c66ec618fbbd109
100 Risk Score

Malware Insights

MITRE ATT&CK
T1559.001 Component Object Model Hijacking T1204.002 Malicious File

The file is an Excel document containing an embedded OLE object, specifically identified as a Equation Editor object. Heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous size, strongly suggesting exploitation of a vulnerability within the Equation Editor component. 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/z3i.HYAjn 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
56b0036ced6d1e685a963be6d75a2c6b8e2cf87a93ef09d5f08b34a6f8459605		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/z3i.HYAjn 835584 bytes
ooxml_oleobject_00_ole10native_00.bin
5ebf3402f9b03556a4b695d6854f0053df44f7b8b43c3c147a06992954f7f8a7		 ole-package OOXML xl/embeddings/z3i.HYAjn Ole10Native stream: OlE10natIVe 826795 bytes

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