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

Static analysis result for SHA-256 c6cb24c15cf6a92d…

MALICIOUS

Office (OOXML) / .XLSX

654.3 KB Created: 2023-08-03 11:34:29 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2023-09-05
MD5: f5d240f747f893bdf12a73d0a8567d64 SHA-1: fda4523c43d905605bfe9c7b4c00cfab9fce03fb SHA-256: c6cb24c15cf6a92d26315019e86a0dfdd67d25a9fd25d7ad309d5d36c3c21bdf
100 Risk Score

Malware Insights

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

The XLSX 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 and size discrepancy, strongly suggesting exploitation of a known vulnerability like CVE-2017-11882. This technique is commonly used to achieve arbitrary code execution.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/gEf.L8 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
5ded565df25ae1f40ca0feec5f5b76fd1e1aa37d9200228083197b460ae9ad54		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/gEf.L8 985600 bytes
ooxml_oleobject_00_ole10native_00.bin
1a3fc7cf74e32d6e3f79a21ef2cd7164ef5c54f604b5176f910e49ee588a3984		 ole-package OOXML xl/embeddings/gEf.L8 Ole10Native stream: oLe10naTIvE 975231 bytes

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