Office (OOXML) / .XLSX malware analysis — malicious · f8194197ac25e3f3

MALICIOUS

Office (OOXML) / .XLSX

1.56 MB Created: 2021-09-22 12:07:42 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2022-03-24

MD5: 6e1458152bd248c99b1b3ae31cf11210 SHA-1: 076d0e1880dcd9d0ac1d52b6c031614f0adcbe29 SHA-256: f8194197ac25e3f303ed675d555406ed2ea23356769a2c904b9caf06cee05bb3

142 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious File T1204.002 Malicious File: Malicious Attachment T1559 Component Object Model Hijacking T1559.001 Component Object Model Hijacking: Component Object Model Hijacking

The sample is an Excel spreadsheet containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. Heuristics indicate this object is anomalous and carries a payload, strongly suggesting exploitation of CVE-2018-0798. The embedded artifact 'ooxml_oleobject_00_ole10native_00.bin' is likely the second-stage payload, though its specific nature cannot be determined from static analysis alone. The attack pattern is consistent with exploiting the Equation Editor vulnerability to execute arbitrary code.

Heuristics 5

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/Ftu84B0F.ejxJm 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` `e250e401c5c69eb66f3ed2bc8a2b9a8bb4ae5e1fc2f2571c565f3a7600d57dd6`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/Ftu84B0F.ejxJm	1924096 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` `1f37ddbffe9ac64c59fa421105741874628b1ee3bcc51f73418f1148f3eff08d`	ole-package	OOXML xl/embeddings/Ftu84B0F.ejxJm Ole10Native stream: Ole10Native	1906324 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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