Office (OOXML) / .XLSX malware analysis — malicious · 554d5e3c450437a3

MALICIOUS

Office (OOXML) / .XLSX

1.41 MB Created: 2022-11-18 02:05:27 UTC Authoring application: Microsoft Excel 12.0000

MD5: d36e4c8c734f3b0b5235a2c87bb742b4 SHA-1: 3cbdd158029fa6eeca2373ffe0f270ba5f1279dd SHA-256: 554d5e3c450437a3eb24db98867b3bbd7b086bf23f57a71374813b42b022be1a

142 Risk Score

Malware Insights

MITRE ATT&CK

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

The file is an Excel document containing an embedded OLE object, specifically targeting the Equation Editor. Heuristics indicate exploitation of CVE-2018-0798 via an anomalous Equation Editor native stream, which carries a payload-like Ole10Native stream. This suggests the document 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/A2Rh.bFwf3Q6 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` `b57baf3272f1d7cd26353564fd04f467ae59673363bf1601d3b49adb7951997d`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/A2Rh.bFwf3Q6	1793536 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` `84662ed83816769a80aa64df32609af58b097536fbcd5e0a0b18dfc816c34475`	ole-package	OOXML xl/embeddings/A2Rh.bFwf3Q6 Ole10Native stream: oLE10NAtivE	1776869 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.99, consistent with packed or encrypted content.

Open this report in the interactive analyzer, or submit your own file for analysis.