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

Static analysis result for SHA-256 45aa5d4ffefa0719…

MALICIOUS

Office (OOXML) / .XLSX

737.0 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-10-22
MD5: 27e1f1d3156488c26e93e6f05b85179f SHA-1: ba431bc31faa40cd631a8f83403c26e61431a838 SHA-256: 45aa5d4ffefa0719c08c17fe7c5247f1f6dd44914341ce72b5d9efd85720fa9f
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1559.001 Component Object Model Hijacking

The sample is an OOXML file 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 and size discrepancy, strongly suggesting exploitation of a vulnerability within the Equation Editor component. This is a common delivery mechanism for exploiting client-side vulnerabilities to execute arbitrary code.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/hggL8M4Au.7Uh3GL 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
45d39bf6af611e698945cdd4705e966802503a97687002d5c7a79627fff88068		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/hggL8M4Au.7Uh3GL 1005056 bytes
ooxml_oleobject_00_ole10native_00.bin
f87c276665303b01215806bf8d259bc11b2f05c9ac0e0617a40f1282df84d25e		 ole-package OOXML xl/embeddings/hggL8M4Au.7Uh3GL Ole10Native stream: oLE10nATivE 994424 bytes

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