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

Static analysis result for SHA-256 f4d8c1a30a7b5bcc…

MALICIOUS

Office (OOXML) / .XLSX

725.5 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-10-20
MD5: 7c8f10ca8113bde86cc98e6e08c2318c SHA-1: 6d985706cb5c210d944e07b24dffd9ae5d57927f SHA-256: f4d8c1a30a7b5bcc8c486c0be1255b620da33af0bd491fe6bc28a1ae90300428
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The file is an Excel document 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 and size discrepancy, strongly suggesting exploitation of a known vulnerability within the Equation Editor component to execute arbitrary code. The embedded object's path and stream name are logged as IOCs.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/QQ.cXgil 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
b2e4de7752d070fb0246a1e04cda79f6a2c7613fa742a5a7d79ee62199e9d871		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/QQ.cXgil 1061888 bytes
ooxml_oleobject_00_ole10native_00.bin
d40fe7cd38199c56907ba1c76b263c992fec4196fdb611c61c44024133211546		 ole-package OOXML xl/embeddings/QQ.cXgil Ole10Native stream: OLE10natIve 1050982 bytes

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