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

Static analysis result for SHA-256 dc6e227e1d32bef2…

MALICIOUS

Office (OOXML) / .XLSX

660.5 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-08-22
MD5: bd6aeace5493d11ff8089de4de8d8dbd SHA-1: a764d1f4575f91c6b45fa075dc159e93789edb34 SHA-256: dc6e227e1d32bef271dad2c2fc442868c1ac7df3b7999f7ab935702bd30694a2
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 header and a significantly larger declared inner size than the stream size, strongly suggesting exploitation of a vulnerability like CVE-2017-11882. This indicates the file is designed to exploit this vulnerability to execute a secondary payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/3vd2.Xu3a1 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
f778381de854deef0c289fe5aff168b5ddb3307b6ded42d851caa2dcf4f4c72c		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/3vd2.Xu3a1 933376 bytes
ooxml_oleobject_00_ole10native_00.bin
3b2b7bea054b9a6b4f985fab489fecabfb2d3e2889bd4b03180f535f8cc1185a		 ole-package OOXML xl/embeddings/3vd2.Xu3a1 Ole10Native stream: oLE10NATive 923147 bytes

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