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

Static analysis result for SHA-256 9ee13069cb3b3ebb…

MALICIOUS

Office (OOXML) / .XLSX

666.2 KB Created: 2022-08-10 18:51:50 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2023-08-14
MD5: f279256ad61383a81695c10caa2a2002 SHA-1: cc10b848160f2884c598afe42e00d966442c345f SHA-256: 9ee13069cb3b3ebbb0b002957e8539c9d4dc47582209acb73cabfb05d7a9abd1
100 Risk Score

Malware Insights

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

The file is an Excel document containing an embedded OLE object, specifically identified as an Equation Editor object. Heuristics indicate that this object carries a payload-like Ole10Native stream with an anomalous size, suggesting it's not a legitimate Equation Editor object but rather a container for malicious content. The presence of this anomalous OLE object strongly suggests an attempt to exploit vulnerabilities or deliver a secondary payload when the document is opened.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/XDo78jjFP.q6YtP 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
105206b1ef77f91008f594d60a9378fd9acabfa56eb04ef852c5f46b8d3d5b82		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/XDo78jjFP.q6YtP 960512 bytes
ooxml_oleobject_00_ole10native_00.bin
e4e6b7c29d916b00f1e413bedbba55fd884c09a326d1fa1740b3c8d047b13951		 ole-package OOXML xl/embeddings/XDo78jjFP.q6YtP Ole10Native stream: OLE10NaTIve 950739 bytes

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