Office (OOXML) / .XLSX malware analysis — malicious · 11d195441403dc81

MALICIOUS

Office (OOXML) / .XLSX

73.5 KB Created: 2020-11-26 04:46:39 UTC Authoring application: Microsoft Excel 15.0300

MD5: 0093cacd75f584ca33394a3b939a78be SHA-1: 177346b6f6c967e2e61635d91447c544318399de SHA-256: 11d195441403dc817c5548c7ecb041e5e328f0751d6cc295058e81f916cea67e

142 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution

The sample is an Excel file containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. Heuristics indicate that this object is anomalous and carries a payload-like Ole10Native stream, strongly suggesting exploitation of a vulnerability like CVE-2018-0798 for client execution. No specific malware family could be identified from the static analysis.

Heuristics 5

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/oleObject1.bin 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` `269d2b95b16dc18bc7ae68a60bd3ee61ce81cf9627b0bc93de9a966bcef4d55f`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/oleObject1.bin	71168 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.93, consistent with packed or encrypted content.
`ooxml_oleobject_00_ole10native_00.bin` `ce602722c41d9e2cfe4ee68dd1fe9e2c6f5bf81d73c6d22670e6631ae8246e53`	ole-package	OOXML xl/embeddings/oleObject1.bin Ole10Native stream: OLE10NatiVE	67712 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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