Office (OOXML) / .XLSX malware analysis — malicious · 96e7e783d9d9199a

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: 53f784541804948fb5202d124caf8c8e SHA-1: 332497d90e4fcff39c5abf87285223ea26c14f92 SHA-256: 96e7e783d9d9199afdd5188b12c06fcfc2c73cb4075e7c991d945d4d42d5b264

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 file contains an embedded OLE object, specifically an Equation Editor object, which is known to be vulnerable to CVE-2018-0798. The high entropy and anomalous native stream within the Equation Editor object indicate it carries a malicious payload. This payload is likely designed to be executed upon opening the document, exploiting the Equation Editor vulnerability.

Heuristics 5

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/wuj.TtIY5XA 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` `a05e76cc652e9fdd4b9210e337aefb4a86f5a0e3b8a4e3818d26832a499084bf`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/wuj.TtIY5XA	1787904 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` `bebf4456aec2a440cde54cedadfefdc7efa04c00c3a338c76cc696fee6fbbac8`	ole-package	OOXML xl/embeddings/wuj.TtIY5XA Ole10Native stream: oLe10nAtiVe	1771250 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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