Office (OOXML) / .XLSX malware analysis — malicious · b6daa340200ee967

MALICIOUS

Office (OOXML) / .XLSX

1.05 MB Created: 2022-11-18 02:05:27 UTC Authoring application: Microsoft Excel 12.0000

MD5: 2c265f3f5136de58896ec5bd9d814a5d SHA-1: 5930e285662ab9b3ae5228acb16802a9c1eb1bdd SHA-256: b6daa340200ee967ef4a7c2a2378014c978aa553ca4d6aa5cb6317ed049378b7

142 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious File

The file is an Office document containing an embedded OLE object, specifically identified as a vulnerable Equation Editor object. Heuristics indicate exploitation of CVE-2018-0798, which is consistent with the Equation Editor object carrying a payload-like Ole10Native stream. This suggests the document is designed to exploit this vulnerability to execute a secondary payload.

Heuristics 5

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/ExJ6nWC0.4E contains the Equation Editor CLSID, the legacy component exploited by CVE-2017-11882, CVE-2018-0802, and CVE-2018-0798.
CVE-2018-0798 — anomalous Equation Editor native stream high CVE likely CVE_2018_0798_EQUATION_NATIVE_ANOMALY

Embedded Equation Editor OLE data contains anomalous native stream bytes consistent with a CVE-2018-0798-style Equation Editor exploit. This is treated as likely CVE evidence because the Equation object is malformed and payload-like, but it does not match the exact public matrix-overflow byte signature.
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
Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`ooxml_oleobject_00.bin` `2d136dd69e2ac315b0f486346e0d905f601e66b7110cd5797d199f0a3f42dba8`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/ExJ6nWC0.4E	1329152 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.91, consistent with packed or encrypted content.
`ooxml_oleobject_00_ole10native_00.bin` `d106c753a0ed18db735fff778c59bc75184906676ea5d09cdceb1c40fc557174`	ole-package	OOXML xl/embeddings/ExJ6nWC0.4E Ole10Native stream: ole10nAtIVe	1316230 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.89, consistent with packed or encrypted content.

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