Office (OOXML) / .XLSX malware analysis — malicious · 2b7f57676e5ca577

MALICIOUS

Office (OOXML) / .XLSX

1.93 MB Created: 2022-11-18 02:05:27 UTC Authoring application: Microsoft Excel 12.0000

MD5: 2a05dbe2a4ff7174cf52e51b3b9855ca SHA-1: d1ffc456add1b0616576e409dd6361e83f5031aa SHA-256: 2b7f57676e5ca57765272dba44c4ebad3b4b0cc9db7904d6009aa78e2ff08adc

142 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious File

The file is an Excel document containing an embedded OLE object, specifically identified as a vulnerable Equation Editor component. Heuristics indicate anomalies consistent with CVE-2018-0798, suggesting the embedded object is designed to exploit this vulnerability for arbitrary code execution. The high entropy and anomalous stream size of the Ole10Native stream further support the presence of a malicious payload.

Heuristics 5

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/BZng.lz0r 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` `51d70b7f318a453d746fbd869fc61a3ecfc283b944c98d90e3476f8ab021c326`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/BZng.lz0r	2273792 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` `368dee7a43899aafee38574e6e8b31ebb21e01ddff24205125f2232283ec2925`	ole-package	OOXML xl/embeddings/BZng.lz0r Ole10Native stream: OlE10NaTive	2253341 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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