Office (OOXML) / .XLSX malware analysis — malicious · f58ce2cdcbf4eea5

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: 061a02345a108e74772f6af5cc124b2e SHA-1: 924b09041a07b3717b1888e135bf52993e0d62e2 SHA-256: f58ce2cdcbf4eea53aa895b6e5db732af8af4d7c520c55d5ad364d0cdc947336

142 Risk Score

Malware Insights

MITRE ATT&CK

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

The file is an Excel spreadsheet containing an embedded OLE object, specifically an Equation Editor object. High-severity heuristics indicate that this object exploits CVE-2018-0798 due to anomalous native stream data and a high entropy payload. This suggests the object is designed to drop and execute a secondary malicious payload.

Heuristics 5

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/FAobHS.uIuO 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` `a041b5f45bef4e71c53a205f9bd8e91ba09bed1518dbbc4fbe35666b22d794a0`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/FAobHS.uIuO	1661952 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` `d2cdc65cfb2a9cfa8205c323291eda5b458718352fe8b52dcd976483502a8659`	ole-package	OOXML xl/embeddings/FAobHS.uIuO Ole10Native stream: ole10NatIVe	1646166 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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