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

Static analysis result for SHA-256 d13ad19aa79e6f97…

MALICIOUS

Office (OOXML) / .XLSX

682.6 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-10-23
MD5: c46d33d7a47a90b790999ace9c61f463 SHA-1: 6bee86f44799f63a798fdd60205f1fc49e5cddf3 SHA-256: d13ad19aa79e6f9781804b669fcefc3391f04993efb44326ab362b6c07037d0c
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 Malicious Link

The XLSX file contains an embedded OLE object, specifically identified as a Microsoft Equation Editor object. This object exhibits an anomaly where the Ole10Native stream is unusually large and appears to carry a payload, strongly suggesting exploitation of a known Equation Editor vulnerability. The presence of this object indicates the file is designed to exploit this vulnerability upon opening, likely to download and execute a secondary malicious payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/Ww4j3.FGZLr 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
74cbf2ee67ab6a228bc6d4ea63ca2bcd300a3a33761f754fb6debe7e4df33774		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/Ww4j3.FGZLr 1018880 bytes
ooxml_oleobject_00_ole10native_00.bin
3470e2b29a12133b24ca9b456f7c08b7793233ca777bb0f0e619f4aaf61d7077		 ole-package OOXML xl/embeddings/Ww4j3.FGZLr Ole10Native stream: OlE10naTIvE 1008154 bytes

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