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

Static analysis result for SHA-256 3aa0ae7d65035876…

MALICIOUS

Office (OOXML) / .XLSX

598.3 KB Created: 2023-08-03 11:34:29 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2023-09-23
MD5: 2e5ecd869c480e63312c9ede45f7074a SHA-1: 3cd56a23557ef9bc4b3ab15c2fce88fc03c9af0c SHA-256: 3aa0ae7d65035876e5bba32601698bfafa3aeb2146cb649c7ae03d041e36a1e8
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 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 size and entropy, strongly suggesting it is being used to exploit a known vulnerability (CVE-2017-11882) for arbitrary code execution. The embedded object is the primary indicator of malicious intent, likely leading to the download and execution of a second-stage payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/yoqKT0.3BSYdk1 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
768eb66c3c6d5bbfb2d21e271dcd6eb05412f8f5f3a1a56cf45342b01c5e4dee		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/yoqKT0.3BSYdk1 817152 bytes
ooxml_oleobject_00_ole10native_00.bin
1fbc62e69a369126d4ac971888ef0d7913557f161d4c2f93724838ccf9456297		 ole-package OOXML xl/embeddings/yoqKT0.3BSYdk1 Ole10Native stream: Ole10nAtive 808063 bytes

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