Office (OOXML) / .XLSX malware analysis — malicious · e89e3adec7804120

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: 8d872ce9212ac69cb69bfd320f41034c SHA-1: cfb9566649142c44bf160a83039cf5079d445adf SHA-256: e89e3adec78041202f3efa936d91d71fcb9e886ff1cd757ac34072a592370f4f

142 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious File T1204.002 Malicious File: User Execution T1559 Component Object Model Hijacking T1559.001 Component Object Model Hijacking: Component Object Model and Distributed Component Object Model

The XLSX file contains an embedded OLE object, specifically an Equation Editor object, which exhibits anomalies indicative of CVE-2018-0798. This suggests the file is designed to exploit this vulnerability to execute a malicious payload. The embedded OLE object and its associated native stream are the primary indicators of compromise.

Heuristics 5

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/bzwmLqPRN.9iFPKLB 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` `954fe5d74b21f71b29462e1a7d8ba2ac19695fe040b140c7bb390da586b9d73c`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/bzwmLqPRN.9iFPKLB	1534976 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.99, consistent with packed or encrypted content.
`ooxml_oleobject_00_ole10native_00.bin` `b94af0f93f2bd409d528f6794d5267f1ee238c0747f91dd5e08221d3e9c27a7f`	ole-package	OOXML xl/embeddings/bzwmLqPRN.9iFPKLB Ole10Native stream: OLE10nAtIVE	1520138 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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