Office (OOXML) / .XLSX malware analysis — malicious · d2a7c435e6a0189d

MALICIOUS

Office (OOXML) / .XLSX

2.71 MB Created: 2023-08-03 11:34:29 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2023-08-10

MD5: 8470c6294d27e627a4e5e80834fb4f12 SHA-1: df6b90dea2166a6f7bdbe7c73ab6e699bc0d6141 SHA-256: d2a7c435e6a0189df3e4c710bd792a3dd357c0b85871ca4359ddf980216f8696

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

The file is an Excel spreadsheet containing an embedded OLE object, specifically an Equation Editor object. Heuristics indicate this object exploits CVE-2018-0798 due to anomalous native stream properties and a payload-like Ole10Native stream. This suggests the embedded object is designed to execute a malicious payload upon interaction, likely leading to further compromise.

Heuristics 5

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/JMt.g1iQCed 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` `f09535de237b38ebaca01b0c174c09a0af56435667adf3fd80b768bafd16e87f`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/JMt.g1iQCed	3181568 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.96, consistent with packed or encrypted content.
`ooxml_oleobject_00_ole10native_00.bin` `a86e78faa78e5605fb9a6eadc9690f74cb4ab9b9a5d2a446dc51c2cf51d9fe2f`	ole-package	OOXML xl/embeddings/JMt.g1iQCed Ole10Native stream: Ole10natIVE	3153931 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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