Office (OOXML) / .XLSX malware analysis — malicious · 30463c6629c0fe30

MALICIOUS

Office (OOXML) / .XLSX

1.21 MB Created: 2022-11-18 02:05:27 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-05-24

MD5: fd99a7790dad45048117144031672538 SHA-1: 697f0beb864766a9d47ff096b2977b29b6eec724 SHA-256: 30463c6629c0fe30226d84ff67ce42cb62c2feb636529d595fb75c11dcd93b24

182 Risk Score

Malware Insights

MITRE ATT&CK

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

The file is an Excel document containing an embedded OLE object, specifically a malicious Equation Editor object. Heuristics indicate exploitation of CVE-2018-0798, a vulnerability associated with the Equation Editor. This suggests the file is designed to exploit this vulnerability to execute a secondary payload, likely embedded within the Ole10Native stream.

Heuristics 6

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/GE0oPAC.HQEDV 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.
Heap-spray pattern detected high SC_HEAP_SPRAY

Repeated 0x0C bytes found
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` `aa65c53335774bdebd128d05412892a6ce1e69cbacf88fd5ab904c9ceb3a0ee0`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/GE0oPAC.HQEDV	1541632 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` `a0623097595b8cc7a97525d6695120d243dcb15d39e91d3d9e0eb76f9ad12bbe`	ole-package	OOXML xl/embeddings/GE0oPAC.HQEDV Ole10Native stream: olE10nAtIve	1526802 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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