Office (OOXML) / .XLSX malware analysis — malicious · 56474a7d2dc26328

MALICIOUS

Office (OOXML) / .XLSX

119.7 KB Created: 2020-06-18 10:05:01 UTC Authoring application: Microsoft Excel 15.0300

MD5: 27844218b04409949819ef27c801963d SHA-1: daef72171c32213edaad171a7470af9a0c6830b0 SHA-256: 56474a7d2dc26328b1789da0925d765a371b8992af5df67dff5eedc0e76801b0

142 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1027 Obfuscated Files or Information

The sample is an Office Open XML (XLSX) file containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. Heuristics indicate this object exhibits anomalies consistent with CVE-2018-0798, suggesting it carries a malicious payload within its Ole10Native stream. This exploit likely facilitates the execution of a secondary malicious component.

Heuristics 5

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/oleObject1.bin 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` `143c726fe2e7e1e8ab62ac20b5f53d288fd1c6b1418cc1a751c2da15475814f4`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/oleObject1.bin	118272 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.97, consistent with packed or encrypted content.
`ooxml_oleobject_00_ole10native_00.bin` `487211d7ad6727ba572b4394d53bf543e84eeb462a5f9c10bbb9dfeba30271fd`	ole-package	OOXML xl/embeddings/oleObject1.bin Ole10Native stream: Ole10Native	114875 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 8.00, consistent with packed or encrypted content.

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