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

Static analysis result for SHA-256 2e61ca08761e8ee7…

MALICIOUS

Office (OOXML) / .XLSX

704.6 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-09-22
MD5: cb74216a660f1e8bec72d04327298900 SHA-1: 85beaf6112dcbd2f2cfb82cc6d80977dccb8f5a0 SHA-256: 2e61ca08761e8ee74ea57c69e5b17be5263eca4a4fb36468d99c37635afa54d5
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The XLSX file contains an embedded OLE object, specifically identified as a Equation Editor object. This object exhibits an anomaly where the Ole10Native stream size is significantly larger than expected, indicating it likely carries a malicious payload. The presence of this exploit within an Office document strongly suggests a spearphishing attachment attack vector.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/OrSrYQvN.vdmy7V 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
8afa7bf8a742f16b2c5cd972713e766012dce755ddc2afc84c5fede5a94f998f		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/OrSrYQvN.vdmy7V 1044480 bytes
ooxml_oleobject_00_ole10native_00.bin
950dee134b301be54f327c2b8b32fc81dbbb153837aa1e7614df3d84212c3e82		 ole-package OOXML xl/embeddings/OrSrYQvN.vdmy7V Ole10Native stream: OLe10NAtIvE 1034072 bytes

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