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

Static analysis result for SHA-256 113edea4b715ceec…

MALICIOUS

Office (OOXML) / .XLSX

641.3 KB Created: 2023-08-03 11:34:29 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2024-06-14
MD5: 606adad87f36a0747a33dceca834764e SHA-1: 1a2f30fd65d65fdfb2a46288ede2381cf4453e2a SHA-256: 113edea4b715ceec6930b2598da9ba9a00648fcc45ba5383c1405311f6f93018
100 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious File T1204.002 Malicious File: Malicious Attachment

The file contains 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 size difference, strongly suggesting exploitation of a vulnerability within the Equation Editor component. This is a common technique for delivering second-stage malware.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/8wUvXN.Jjtl1 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
933279bc65e27a12b62d6ff55ea21881b536f879675d6516dcff519e46f4e4aa		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/8wUvXN.Jjtl1 909824 bytes
ooxml_oleobject_00_ole10native_00.bin
986c218e6cbacc4298b480f18471ca973fb6b3db42f1ee89a657da4a8b80d39a		 ole-package OOXML xl/embeddings/8wUvXN.Jjtl1 Ole10Native stream: olE10NatiVE 900581 bytes

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