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

Static analysis result for SHA-256 11fa33591b75a9c3…

MALICIOUS

Office (OOXML) / .XLSX

666.9 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-08-07
MD5: 26b5685493d76eadbf947a41a6f25ec2 SHA-1: cfac8fce150848acfa025fc6e79dae1ceb186405 SHA-256: 11fa33591b75a9c356e8cb59a9553fe8884f06996cd2fed97a859c53c44060d1
100 Risk Score

Malware Insights

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

The sample is an Office document 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 header, suggesting it's designed to exploit a vulnerability. This is a common delivery mechanism for malware, often initiated via spearphishing attachments.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/1yfP.PPF 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
dd5537304ca47f0fa10a2366e059732cb5d11dab49edab64c3779d4e13f7376f		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/1yfP.PPF 909824 bytes
ooxml_oleobject_00_ole10native_00.bin
3cf0d58f01a2039351220bdfc4686ae39c1f6f13aabd90502768e2c57f560886		 ole-package OOXML xl/embeddings/1yfP.PPF Ole10Native stream: Ole10NaTiVE 900287 bytes

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