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

Static analysis result for SHA-256 6c7f6bd9d05bcacc…

MALICIOUS

Office (OOXML) / .XLSX

693.1 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-08-09
MD5: 36cf5c495f1196fe1d037f06869b1f30 SHA-1: a35f55c1d53b41424905cf7f061c5950ec21e653 SHA-256: 6c7f6bd9d05bcacce7c0821b3d25f41cc96632d6febd0bcbd460c134df739f9c
100 Risk Score

Malware Insights

MITRE ATT&CK
T1559.001 Component Object Model Hijacking T1204.002 Malicious File

The sample is an Office 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 header, suggesting exploitation of a vulnerability. The large declared inner size compared to the stream size further supports this. This indicates the document is designed to exploit the Equation Editor vulnerability to execute a secondary payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/hS64N.BI 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
61b4956a267d4dc2c4591e47a3dc1034b3b5d086fd4b64fbeaf9923a735cd6fb		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/hS64N.BI 937984 bytes
ooxml_oleobject_00_ole10native_00.bin
2cfc756a8ea655f196f9c107281d6cd2f73b785c00c029862255eaf73ca9f362		 ole-package OOXML xl/embeddings/hS64N.BI Ole10Native stream: OlE10NAtiVe 927759 bytes

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