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

Static analysis result for SHA-256 791db9252f317443…

MALICIOUS

Office (OOXML) / .XLSX

745.5 KB Created: 2023-09-27 08:05:40 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-10-04
MD5: e5a6ecac91837064aa4e0b32e54f2700 SHA-1: 92b61d805d8a0132ccfd7a647524beb0b83b66a4 SHA-256: 791db9252f3174431b898a3df6e737d3f47989edae07e4a686d04c9b19b43b6b
100 Risk Score

Malware Insights

MITRE ATT&CK
T1559.001 Component Object Model Hijacking T1204.001 Malicious Link

The file contains an embedded OLE object, specifically identified as an Equation Editor object. This object carries a payload-like Ole10Native stream with an anomalous header, indicating it's designed to execute malicious code. The presence of an embedded OLE object and the anomalous payload stream strongly suggest an exploit targeting the Equation Editor component to deliver a secondary payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/Hu.SpoCwH 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
348d88f2476aca0586e2fd2a3e049c61f7609787447a5548249c8f31f0204802		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/Hu.SpoCwH 1056768 bytes
ooxml_oleobject_00_ole10native_00.bin
76909e1b57d5096a1010883945428508c758c807537270bdfe78f7d05a69c843		 ole-package OOXML xl/embeddings/Hu.SpoCwH Ole10Native stream: OLE10NATIVE 1045649 bytes

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