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

Static analysis result for SHA-256 807a4939c263c7da…

MALICIOUS

Office (OOXML) / .XLSX

635.5 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-10-07
MD5: 76b8e770e43a86225100af1d6c453db4 SHA-1: 4d26cba976150a545fdc69952fe6313882de2534 SHA-256: 807a4939c263c7dac20c558e287011049b23dc998c3dcbf8efb897b25b3bcf26
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is an Excel file containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. High-severity heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous header and size discrepancy, strongly suggesting exploitation of a vulnerability like CVE-2017-11882. This technique is commonly used to deliver a second-stage malicious payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/j7.K6ga 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
54947af4bb4d6d0be8a19f4da6de96b1708a72d4e58a067aa5e7717546987590		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/j7.K6ga 927744 bytes
ooxml_oleobject_00_ole10native_00.bin
cfd1461d2df2a0b0a51b88ed79c9aa36fd409d03834135470f285ae1c66b5feb		 ole-package OOXML xl/embeddings/j7.K6ga Ole10Native stream: ole10NaTIve 917806 bytes

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