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

Static analysis result for SHA-256 c699be2cfdf0ad9b…

MALICIOUS

Office (OOXML) / .XLSX

698.8 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-08-07
MD5: 5f07fa953f834ac97ccb096cf3ec3943 SHA-1: 9c958de4b5c70242c8bdabeed169f7a5b8d8336e SHA-256: c699be2cfdf0ad9b9bffecacd7d8e848a686c4d7e3602e71e50c6ec8836cd7a9
100 Risk Score

Malware Insights

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

The sample is an OOXML file containing an embedded OLE object, specifically identified as a Equation Editor object. High-severity heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous header, suggesting it's designed to exploit a vulnerability. This points to a malicious document likely intended to execute a secondary payload upon opening.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/abiK.sVTa9yO 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
6bcfb0ecd2cf3145cbd8e30e155f776bb2e327ce7db94916dbe746c9efb33ee8		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/abiK.sVTa9yO 974848 bytes
ooxml_oleobject_00_ole10native_00.bin
0e6c360405740d49791dc59108663e81795f610d8766ac39f62bd53ea2360b6e		 ole-package OOXML xl/embeddings/abiK.sVTa9yO Ole10Native stream: Ole10NatIvE 965085 bytes

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