Office (OOXML) / .XLSX malware analysis — malicious · f78024164324e13e

MALICIOUS

Office (OOXML) / .XLSX

681.0 KB Created: 2022-07-21 17:04:09 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2023-07-05

MD5: 3b91f3c150e132597cc21c5f922ff721 SHA-1: 86e739ef95c0b9c251a1a3d6b523a83442baeee9 SHA-256: f78024164324e13e2bac35c065d7d4a56640cd4fe7e7d6f5c02965094f68c4a5

120 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious File

The sample is an Office document containing an embedded Equation Editor OLE object. Heuristics indicate this object carries a payload-like Ole10Native stream with an anomalous header and a significantly larger declared inner size than the actual stream size, suggesting it's packed or obfuscated. The 'SE_ENABLE_LURE' heuristic confirms the document instructs the user to enable macros or editing, a common technique to bypass security measures and execute the embedded malicious content.

Heuristics 4

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/HoC0p1B.LmL 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
Macro/content-enable lure medium SE_ENABLE_LURE

Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`ooxml_oleobject_00.bin` `3694c27e38d5acc54ec24fc7b180d5239fdf1f5b264399c5ad4effca6e9aa4c2`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/HoC0p1B.LmL	998400 bytes
`ooxml_oleobject_00_ole10native_00.bin` `ff36d1430819f7d41fe7ebe95cadf8c6afa285e4363277013fbec6575c8eb103`	ole-package	OOXML xl/embeddings/HoC0p1B.LmL Ole10Native stream: OLE10NATiVe	988090 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.