Office (OOXML) / .XLSX malware analysis — malicious · 5458db17e333428b

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: c4c81642f69dc910ddaf4c66358a0bff SHA-1: 446ad4a0c04d05aee07a4b98cc1ba033952d223f SHA-256: 5458db17e333428b8bd0335c302ea3c3ce02b32fde1d28a4bc98bd4db6e87597

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 XLSX file contains an embedded OLE object, specifically an Equation Editor object, which is anomalous and exhibits characteristics of carrying a payload. The heuristics indicate exploitation of CVE-2018-0798, a vulnerability associated with the Equation Editor. This suggests the file is designed to exploit this vulnerability to execute a malicious payload upon opening.

Heuristics 5

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/4l8ZpnJTw.PPn 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` `d65bf2ff3ecee8e4cb186fdae528276469ec467f477ba34285b47131bbd78d6a`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/4l8ZpnJTw.PPn	1958912 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` `0a05f7ae006399b60287e1ebcb57ef6f7d73fa4236bb96280ffd0fb3685a4e74`	ole-package	OOXML xl/embeddings/4l8ZpnJTw.PPn Ole10Native stream: ole10nAtiVe	1941343 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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