Office (OOXML) / .XLSX malware analysis — malicious · f4b877837db9656f

MALICIOUS

Office (OOXML) / .XLSX

1.25 MB Created: 2022-03-31 04:25:31 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2022-03-31

MD5: c050d7cbca7abd0d3a27b3bf1de4d877 SHA-1: a3a9f9445fb449786efa2aeaef1318f7b8f0c9a0 SHA-256: f4b877837db9656f8810b10de2cdf3b8bafb48df6c267b3aa483602c85aba222

142 Risk Score

Malware Insights

MITRE ATT&CK

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

The sample is an Excel file containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. High-entropy anomalies within the Equation Editor's native stream indicate it carries a payload, consistent with exploitation of CVE-2018-0798. This suggests the file is designed to exploit this vulnerability upon opening, leading to the execution of a secondary malicious payload.

Heuristics 5

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/DXgd.D7DMl 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` `fdff9ee2a144ad23de241576e03956be2cd7906b4235acede895243b11980fec`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/DXgd.D7DMl	1606656 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` `65a0709912a474931e583b8ca95abe02baeffc575649478a07c7e699ba3ec5a1`	ole-package	OOXML xl/embeddings/DXgd.D7DMl Ole10Native stream: OLe10naTIVe	1591350 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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