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

Static analysis result for SHA-256 a6c1f1be97ef68cb…

MALICIOUS

Office (OOXML) / .XLSX

737.9 KB Created: 2023-08-27 23:47:46 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-08-28
MD5: 4c60966405a92acf9fbb4b2295e32d1b SHA-1: 89fc363a43f8d45cc9dfe15ffa50dec05f3408a2 SHA-256: a6c1f1be97ef68cb5dd57644bd2eeb3d3e0345a3cbc70e7516b9387a77cba0f7
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1204.002 User Execution: Malicious File

The sample is an OOXML file 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 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/LYsxmfZ3E.U7s01i 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
91edba5a515bd7ad95d0c95603aedc12f389358f1263260a9445b7cc7b8abb08		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/LYsxmfZ3E.U7s01i 1085952 bytes
ooxml_oleobject_00_ole10native_00.bin
edfe619d24b0b26ae41d634f1cf283b80656bfdf1a9efcff2c33481df5245039		 ole-package OOXML xl/embeddings/LYsxmfZ3E.U7s01i Ole10Native stream: Ole10NaTIVE 1074987 bytes

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