Office (OOXML) / .XLSX malware analysis — malicious · 882d3e1060eb9d43

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: efb0a74b503a480e67ec67ec2e445bbe SHA-1: 51a4e760ccebfdd8fef8f3966ff5a34a7eba9800 SHA-256: 882d3e1060eb9d43c7bf27f9e4aa47d714b27fce723dee0a434defc4de094ba2

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 an Equation Editor object. Heuristics indicate this object is anomalous and likely carries a payload, exploiting CVE-2018-0798. The embedded artifact has high entropy and an impossible declared inner size, strongly suggesting it's a malicious payload designed to be executed.

Heuristics 5

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/yf2.D1 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` `8edb42ba0216988b75046665f543ef9fc0f3d192d2a77a31e417f5cd052c73b0`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/yf2.D1	1523712 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.94, consistent with packed or encrypted content.
`ooxml_oleobject_00_ole10native_00.bin` `3b1e165ac8f047e595aa701a3d705230b0642ebe43e4d16a0bca1bfcfa82d4bc`	ole-package	OOXML xl/embeddings/yf2.D1 Ole10Native stream: Ole10NATiVe	1509285 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.90, consistent with packed or encrypted content.

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