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

Static analysis result for SHA-256 4893b2aa4ddda603…

MALICIOUS

Office (OOXML) / .XLSX

611.3 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-08-22
MD5: fadc508cfeed80ef0fcb11eee7dc9339 SHA-1: f0ab7c3903969dd2353574ecdf23054413297459 SHA-256: 4893b2aa4ddda6036d76e34e8fbbf5bd5d10543e2d0abbafee7088dd139fe5cc
100 Risk Score

Malware Insights

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

The file contains 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 header, suggesting it's designed to exploit a vulnerability. This points to a likely attack pattern involving the exploitation of the Equation Editor to download and execute a secondary payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/E7aOLco.Lrev7g0 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
b6d4bd6a5f3d5f906274ed65ff3c8e8967fa7411f56facff50281a2b21197758		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/E7aOLco.Lrev7g0 908288 bytes
ooxml_oleobject_00_ole10native_00.bin
b59470d15e2ebc08e89abc8f3f12074c0ebc70f84d56c84b885e4483e9f8cc56		 ole-package OOXML xl/embeddings/E7aOLco.Lrev7g0 Ole10Native stream: Ole10nAtIvE 898862 bytes

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