Office (OOXML) / .XLSX malware analysis — malicious · fd14c4be9a670624

MALICIOUS

Office (OOXML) / .XLSX

1.09 MB Created: 2022-11-18 02:05:27 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-07-13

MD5: fa4cc727eb7dd88c2f2b962c63010bf9 SHA-1: 2b0ad62dd84d07fcd643c42d54bfb1f12c837871 SHA-256: fd14c4be9a670624d428599b02c0f6ba6779fff9251a592b7d6f08dd7affc2b1

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 vulnerable Equation Editor object. Heuristics indicate exploitation of CVE-2018-0798, suggesting the object is designed to execute a malicious payload. The embedded artifact 'ooxml_oleobject_00_ole10native_00.bin' is likely the delivered payload.

Heuristics 5

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/KQJ0.q0P 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` `5ae818c7775000d508ae6f3bba90a59e5f201d256048312397d1aa50ed109262`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/KQJ0.q0P	1443328 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.75, consistent with packed or encrypted content.
`ooxml_oleobject_00_ole10native_00.bin` `23500f0da885c11e844a4e8b70b5cc45334ef819eb43eb6f237c9edc9e8fe2e7`	ole-package	OOXML xl/embeddings/KQJ0.q0P Ole10Native stream: Ole10NAtiVE	1429327 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.64, consistent with packed or encrypted content.

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