Office (OOXML) / .XLSX malware analysis — malicious · 22d870a984a5e2ac

MALICIOUS

Office (OOXML) / .XLSX

1.59 MB Created: 2019-10-24 08:51:40 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2022-09-21

MD5: 6c652373788488b2696472caa61d6d9f SHA-1: c7f92c095a9a952e1e43d26982835370a12326dc SHA-256: 22d870a984a5e2ac73547271858d80d119dcaff6aea4ecac70dafe2659d65737

142 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1559.001 Component Object Model Hijacking

The sample is an Excel file containing an embedded OLE object, specifically identified as a vulnerable Equation Editor object. Heuristics indicate anomalies consistent with CVE-2018-0798, suggesting the object is designed to exploit this vulnerability for arbitrary code execution. The embedded artifact 'xl/embeddings/NHc.uFByamG' likely contains the malicious payload.

Heuristics 5

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/NHc.uFByamG 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` `1e32e424160a77d0ad2337cfcbdd3e816f30b8eec030103d683bfe1d802f3306`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/NHc.uFByamG	1928192 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` `97d59cde7a5934dc77b93f3ac0fa365c41de865062f5e535c620aad865380df8`	ole-package	OOXML xl/embeddings/NHc.uFByamG Ole10Native stream: ole10NATiVE	1910614 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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