Office (OOXML) / .XLSX malware analysis — malicious · 6bcccc3de5b157d1

MALICIOUS

Office (OOXML) / .XLSX

1.81 MB Created: 2021-09-22 12:07:42 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2022-03-21

MD5: b2b555a4857d7e86a80da55f1c058b79 SHA-1: 420c6f2410fb968bb7d27d7947a1ff9a0dfda2df SHA-256: 6bcccc3de5b157d19a178269d21bdd75258dc9b986fdae7173d43594ddcb3259

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 vulnerable Equation Editor object. Heuristics indicate exploitation of CVE-2018-0798, which allows for client-side execution of arbitrary code. The embedded object's Ole10Native stream exhibits high entropy and anomalous characteristics, suggesting it carries a malicious payload.

Heuristics 5

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/50T4F4zjv.O5SFb 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` `ab718fd37eab80fafe27cba8ce74ba649493986332ce5a6c61722261e9132862`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/50T4F4zjv.O5SFb	2225664 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` `33f5ad0aa67af675f1edb835d022fc9ff4932b9f156e3f991bed5ad7f7de0913`	ole-package	OOXML xl/embeddings/50T4F4zjv.O5SFb Ole10Native stream: Ole10Native	2205907 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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