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

Static analysis result for SHA-256 cb9d4b8bd6e5d3c4…

MALICIOUS

Office (OOXML) / .XLSX

690.9 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-08-20
MD5: 04da4d7edd839a28b58fcae6f5da7993 SHA-1: a6939bd92be501736acb4e7c8afef7c48cb0df5d SHA-256: cb9d4b8bd6e5d3c4ab75785d738da0425661cc9f6da87a594d43e733e2bfdd91
100 Risk Score

Malware Insights

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

The file is an Office Open XML spreadsheet 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, strongly suggesting exploitation of a known vulnerability within the Equation Editor component to achieve arbitrary code execution. The embedded object's path and stream name are noted as IOCs.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/e4.R8VTy8q 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
f4a6cc88f8017f5daf12b30ce8e42c59d26a0db202dfa0a3b6fbf5f1b999eaed		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/e4.R8VTy8q 949760 bytes
ooxml_oleobject_00_ole10native_00.bin
2552ea5bfb3b5efe005390fae76b14b82c706a6c234ee1432f3c0cc0998c121a		 ole-package OOXML xl/embeddings/e4.R8VTy8q Ole10Native stream: oLE10naTIVE 939997 bytes

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