Office (OOXML) / .XLSX malware analysis — malicious · d1ea94c241e00e8e

MALICIOUS

Office (OOXML) / .XLSX

1.25 MB Created: 2021-09-22 12:07:42 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2022-08-16

MD5: 3f464820b643fa78164634e33cdc29e2 SHA-1: aba4ac9ac313087c4bf0df42cbbde140c4b8fc50 SHA-256: d1ea94c241e00e8e59a7212f30a9117393f9e883d2b509e566505bc337c473e3

142 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious Link T1204.001 Malicious Link: Malicious Link T1559 Component Object Model Hijacking T1559.001 Component Object Model Hijacking: Component Object Model Hijacking

The sample is an Excel file containing an embedded OLE object, specifically identified as a vulnerable Equation Editor component (CVE-2018-0798). This object carries a high-entropy Ole10Native stream, indicating it likely contains a malicious payload. The embedded artifact suggests an exploit targeting the Equation Editor to achieve code execution.

Heuristics 5

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/xtgjls.4flk6W 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` `20e078ad706e2aeb38e8e1667ea5424200592087c1b1aea7c4b00c17a8f8d85e`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/xtgjls.4flk6W	1557504 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` `6e6d8434e6e579dd2032a8f2b5fe59d9afcc748d171e3cc575dffd7effa81ff1`	ole-package	OOXML xl/embeddings/xtgjls.4flk6W Ole10Native stream: oLE10NATiVE	1542697 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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