Office (OOXML) / .XLSX malware analysis — malicious · 44049c7d64f0e228

MALICIOUS

Office (OOXML) / .XLSX

1.86 MB Created: 2021-09-22 12:07:42 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2022-04-07

MD5: bf93bbbf80e5d0d4a2413a76f5d1239d SHA-1: 705f6f3b2bad11f54c104bfd0156a7584efb5c80 SHA-256: 44049c7d64f0e228413013d25f101170b8a3e6a31b2e1c6734150506aa3ca08b

142 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 sample is an Excel file containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. High-entropy anomalies within the Ole10Native stream of this object strongly indicate the presence of a malicious payload, consistent with exploitation of CVE-2018-0798. This technique is commonly used to deliver second-stage malware. No scripts were extracted from this sample.

Heuristics 5

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/jmdkG.TTa9 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` `0738b7d279b036a814395d70482f67cea53b1b304362577292b14a16f269ab26`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/jmdkG.TTa9	2205184 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` `0ede1706cbbd282ed55f966e246daf9666205f00189b46566fdbbad6cc99f244`	ole-package	OOXML xl/embeddings/jmdkG.TTa9 Ole10Native stream: Ole10Native	2185485 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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