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

Static analysis result for SHA-256 4db650a8ab92c326…

MALICIOUS

Office (OOXML) / .XLSX

655.2 KB Created: 2023-08-03 11:34:29 UTC Authoring application: Microsoft Excel 16.0300
MD5: 2cc475f6defe513999af931e94cfd6de SHA-1: 045b2c2f35a072a8c8fdb387eed8005b0439953b SHA-256: 4db650a8ab92c32681c5b886908f82a54c24f82c2def0af939f571de60b6cf4b
60 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious File T1559.001 Component Object Model

The sample is an OOXML file containing an embedded OLE object, specifically identified as an Equation Editor object. This strongly suggests exploitation of a vulnerability within the Equation Editor component, a common vector for malware delivery. The embedded object's filename is also provided as an IOC.

Heuristics 2

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/Xy.ZajOyk contains the Equation Editor CLSID, the legacy component exploited by CVE-2017-11882, CVE-2018-0802, and CVE-2018-0798.
  • 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
14c048b5001a7ea1be6e26f6bca489183965e580a929e9debd0a0d45c3aeb823		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/Xy.ZajOyk 890880 bytes
ooxml_oleobject_00_ole10native_00.bin
ec2950155f5531dbaae420bdfe2139c87e77d4e22dd4a0a01f775a85fd2ef393		 ole-package OOXML xl/embeddings/Xy.ZajOyk Ole10Native stream: OLE10NAtiVe 881449 bytes

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