Office (OOXML) / .XLSX malware analysis — malicious · 97127c14c6267779

MALICIOUS

Office (OOXML) / .XLSX

1.55 MB Created: 2021-09-22 12:07:42 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2022-06-17

MD5: e913764056bbcb4f8e3783aa660fa2e3 SHA-1: d011075e2ba6249087aab85d9278967a120ae0d3 SHA-256: 97127c14c6267779a3ccde27dd5253645ad4a502095fa4c0f9156f32f13388ac

142 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1559.001 Component Object Model and Distributed Component Object Model

The sample is an Excel file containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. High-severity heuristics indicate that this Equation Editor object is anomalous and carries a payload, strongly suggesting exploitation of CVE-2018-0798. This vulnerability allows for arbitrary code execution when the embedded object is processed, leading to the delivery of a malicious payload. No document body or script content was extracted, but the presence of the vulnerable Equation Editor object is sufficient evidence of the attack pattern.

Heuristics 5

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/gMwJ.kzos 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` `6f389817d3e14a199a414c763eeb22ad9ada476c90d8631f2a66eb5391887830`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/gMwJ.kzos	1902592 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` `196702183bab3d5795983fd97bf8caf527a377b7f4e6b94aa8841aae6bff456d`	ole-package	OOXML xl/embeddings/gMwJ.kzos Ole10Native stream: Ole10Native	1884951 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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