Office (OOXML) / .XLSX malware analysis — malicious · 84d922762882efeb

MALICIOUS

Office (OOXML) / .XLSX

1.00 MB Created: 2021-09-22 12:07:42 UTC Authoring application: Microsoft Excel 12.0000

MD5: 2a6e5cb6f9b8a84ecbd250e5e1d6017a SHA-1: 394ed72fe51e26191fe5a7f7df45e03a6c13df30 SHA-256: 84d922762882efeb1b414eb759d043264a2689c2347ee82a86298f87abcfae9f

142 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1559.001 Component Object Model Hijacking

The sample is an Excel file containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. Heuristics indicate this object has anomalies in its native stream, consistent with CVE-2018-0798, suggesting it carries a malicious payload. The embedded artifact 'xl/embeddings/bsMlz8c8Z.4G4eN' is the likely carrier of this exploit.

Heuristics 5

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/bsMlz8c8Z.4G4eN 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` `3d96739fa693d0a1287282d394c98f3746d9954f209d2337d095eb4fd8b3e5bd`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/bsMlz8c8Z.4G4eN	1288192 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.81, consistent with packed or encrypted content.
`ooxml_oleobject_00_ole10native_00.bin` `9a9ec1f359a2bdd8de5ae1d6eaadb17cf07a1748a685fc1928da81e8e7ef08a3`	ole-package	OOXML xl/embeddings/bsMlz8c8Z.4G4eN Ole10Native stream: Ole10Native	1275449 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.79, consistent with packed or encrypted content.

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