Office (OOXML) / .XLSX malware analysis — malicious · 0e701ae54a4756ad

MALICIOUS

Office (OOXML) / .XLSX

1.66 MB Created: 2021-09-22 12:07:42 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2022-05-16

MD5: 451f8d0a1a76d9cece4a1368f637412d SHA-1: ef8f92773a509a935ed12c13a137959c10bf4c1a SHA-256: 0e701ae54a4756ad5a19d08d80dfd297d1c3bb50e4b18be79bec88eadc24aff2

142 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution

The sample is an Excel document containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. Heuristics indicate anomalies consistent with CVE-2018-0798, suggesting the Equation Editor is used to exploit a client execution vulnerability. The embedded object's Ole10Native stream appears to carry a payload, which is a common technique for delivering malicious code.

Heuristics 5

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/jrE.IDGsHx 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` `d7042ee23505126bd6afcf0821ff30ea2306cc40d3e4df9fdb5efca8880c3b63`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/jrE.IDGsHx	1975808 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.98, consistent with packed or encrypted content.
`ooxml_oleobject_00_ole10native_00.bin` `5095a8b8bb31a2b70a6fa178f93ccb52e5e4132375da3da1ea2a341dd9384730`	ole-package	OOXML xl/embeddings/jrE.IDGsHx Ole10Native stream: Ole10Native	1957493 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.99, consistent with packed or encrypted content.

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