Office (OOXML) / .XLSX malware analysis — malicious · b4bc61176268ed3b

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: fe4d36df2e9c63a18786e629aac32ada SHA-1: 0c76552a6583009604cb3e2d2e55cdb4da17e724 SHA-256: b4bc61176268ed3ba50d2a4d991fba41563bcfa7355584fcd604c26f95f8b0ad

142 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious File Execution T1559 Component Object Model Hijacking

The file is an Excel spreadsheet containing an embedded OLE object, specifically identified as a vulnerable Equation Editor component. Heuristics indicate this object carries a payload-like stream with anomalies suggesting exploitation of CVE-2018-0798. This points to an attack pattern focused on exploiting the Equation Editor vulnerability to execute a malicious payload.

Heuristics 5

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/FdV1Tmm7.eSXCA 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` `6f808dcda2cac9d14bb47342b5238895422867539dd3f8791a1b0d5535827039`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/FdV1Tmm7.eSXCA	1795072 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` `25978df5bc32db847cb5292b0a081b3ead1993ca208d180558cb281406930111`	ole-package	OOXML xl/embeddings/FdV1Tmm7.eSXCA Ole10Native stream: oLE10NAtIVE	1778573 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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