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

Static analysis result for SHA-256 2dba4dcb15207224…

MALICIOUS

Office (OOXML) / .XLSX

729.4 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-07-27
MD5: c8b6a4416a616c3d6acead26ffd66b46 SHA-1: 55b4bad3085a3c267e71091045ef3124f4583d88 SHA-256: 2dba4dcb1520722483c0d234f258559557b6a23eafbdc3a664bcc5a86b680a14
100 Risk Score

Malware Insights

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

The file is an Excel document containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. Heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous header, suggesting exploitation of a vulnerability within the Equation Editor. This is a common technique for delivering second-stage malware.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/6rdo.he 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
b459522469bb06952546e814fbf4e97b12c4204e98fbf43dc23399e95cd93851		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/6rdo.he 1038336 bytes
ooxml_oleobject_00_ole10native_00.bin
95e9ff1b40763f234b03221f1e9fcda659f88518d8b4ae340fac34927efe71e3		 ole-package OOXML xl/embeddings/6rdo.he Ole10Native stream: OlE10nAtiVE 1027599 bytes

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