Office (OOXML) / .XLSX malware analysis — malicious · 0040ed8bdd0b33d8

MALICIOUS

Office (OOXML) / .XLSX

2.72 MB Created: 2022-07-26 22:32:06 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2022-08-05

MD5: 0c9b48a9171e35dba687f87bfe933b01 SHA-1: 4407f26dc4de8f30a64b5821213571bab0756c25 SHA-256: 0040ed8bdd0b33d81b076002c464c211c649ef114f9dc7cd220ed174dea426b3

142 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious File T1204.002 Malicious File: Malicious Attachment 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. Heuristics indicate that this object is anomalous and likely contains a malicious payload, exploiting CVE-2018-0798. The embedded artifact 'ooxml_oleobject_00_ole10native_00.bin' is flagged as suspicious due to its high entropy and anomalous structure, suggesting it's designed to execute arbitrary code.

Heuristics 5

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/PpB8U.J26d 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` `404318abd9d866dbfb708acdb2acab431a8353c9493546c8dcc39054ad2bf019`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/PpB8U.J26d	3155456 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` `00e183d4fa91dbec3c9589a696d8b9bfc332aec29d76631671280f70ed03a7a0`	ole-package	OOXML xl/embeddings/PpB8U.J26d Ole10Native stream: OLE10NAtIve	3128212 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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