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

Static analysis result for SHA-256 5e9616b820aacb76…

MALICIOUS

Office (OOXML) / .XLSX

629.9 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-08-24
MD5: 97dc31da9d85f83314e5f379979150a7 SHA-1: 63c13ec5116c56b0e788d9b06af8ec0487f3e3aa SHA-256: 5e9616b820aacb768681bf9e82b50907015a09d872c63dac8eec2c9b3784b370
100 Risk Score

Malware Insights

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

The sample is an Office Open XML spreadsheet containing 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 a significantly larger declared inner size than the actual stream size. This strongly suggests exploitation of a known vulnerability within the Equation Editor component to execute arbitrary code.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/PTCVS.50 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
afc57d65d22d8d709105a7ab21ef99fd7b81e03007031ee4e1fdb194e91c7fe6		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/PTCVS.50 871936 bytes
ooxml_oleobject_00_ole10native_00.bin
9ecbb3d2be0e007039363f40d2e0607938b5c389b6bee4ebcf49e81052a000a5		 ole-package OOXML xl/embeddings/PTCVS.50 Ole10Native stream: OlE10nAtivE 862680 bytes

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