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

Static analysis result for SHA-256 09d7ca45799cc253…

MALICIOUS

Office (OOXML) / .XLSX

707.4 KB Created: 2023-08-03 11:34:29 UTC Authoring application: Microsoft Excel 16.0300
MD5: eae1ec3042ed5e4414b400f6b80fb41d SHA-1: 14ee89a38f62c819b1bc5f2d913eed6ad614e33d SHA-256: 09d7ca45799cc253580ba40d320022f383fce8d96969b04010737d9d4c957063
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an Excel document 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 size and entropy, strongly suggesting exploitation of a vulnerability within the Equation Editor to achieve arbitrary code execution. The embedded OLE object and its anomalous stream are the primary indicators of this attack.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/VOY1X.OD0jS 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
68fd1a2c85d763f61966729c94b1c7ed2d22a21208d29e65e65727bbc9c5e378		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/VOY1X.OD0jS 1056256 bytes
ooxml_oleobject_00_ole10native_00.bin
1126f4774c87ec329748a57bead1eb4892ff6e698f497997b879a94e62b6da2e		 ole-package OOXML xl/embeddings/VOY1X.OD0jS Ole10Native stream: oLe10naTiVE 1045213 bytes

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