Office (OOXML) / .XLSX malware analysis — malicious · 3e712da44655fa90

MALICIOUS

Office (OOXML) / .XLSX

1.49 MB Created: 2021-09-22 12:07:42 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2022-07-27

MD5: 067a877cbf7db78eef21dbecc39ccb9b SHA-1: 82064bbc5eaeaf177120c6c47e7dc27584dbf9be SHA-256: 3e712da44655fa907467838cec65e33907059c4de5ca68641a46c3377e150704

102 Risk Score

Malware Insights

MITRE ATT&CK

T1559.001 Component Object Model Hijacking T1204.001 Malicious Link

The file is an Office document containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. This object carries a high-entropy payload within its Ole10Native stream, strongly indicating it's designed to exploit a vulnerability like CVE-2017-11882. The embedded object is likely used to download and execute a second-stage payload.

Heuristics 4

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/R4JRq.7btUJCu contains the Equation Editor CLSID, the legacy component exploited by CVE-2017-11882, CVE-2018-0802, and CVE-2018-0798.
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` `e20d2547febf47ed1abdc874a731c85e0b4a4f2992ada319689239aef74cbc8b`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/R4JRq.7btUJCu	1867776 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` `9eabac470943eda1727e4e7481d04ed7734bfc4ee2e9ffbaeabe1005067b0f21`	ole-package	OOXML xl/embeddings/R4JRq.7btUJCu Ole10Native stream: OlE10natIve	1850375 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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