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

Static analysis result for SHA-256 1db4e8b86635cf6a…

MALICIOUS

Office (OOXML) / .XLSX

613.0 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-08-15
MD5: 790c308405d4a417ae223ec283a2386d SHA-1: 1661bc44554986a5cf9639f0b183da79f658b16e SHA-256: 1db4e8b86635cf6ae188aaec4634a86ead52c4098868abdd9a2d9f2705a35c5e
100 Risk Score

Malware Insights

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

The sample is an OOXML file 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. This is a common delivery mechanism for malware.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/8Gizq.eV 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
b2c37a98756927b8fcfa7cf078e1690a293c927be1f213d8a74dc628eee1225f		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/8Gizq.eV 901632 bytes
ooxml_oleobject_00_ole10native_00.bin
0d0f2b9c77e43d399141ded586e8051b35b90c34cd300f614dc7d87d45f3feaa		 ole-package OOXML xl/embeddings/8Gizq.eV Ole10Native stream: OlE10NATIve 891970 bytes

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