Office (OOXML) / .XLSX malware analysis — malicious · 5ce4b90711c0aa93

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: 0a0364645c33ca3712b3a7ab5f0de06f SHA-1: 4313c3725bd6be5fc49b6a2958939fdae9b87387 SHA-256: 5ce4b90711c0aa930e98641fbdffead1386ea3b5f36c31df71ae8ccb0bcef74d

142 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution

The sample is an Excel file containing an embedded OLE object, specifically identified as an Equation Editor object. Heuristics indicate this object is anomalous and carries a payload, strongly suggesting exploitation of a known vulnerability like CVE-2018-0798 for client execution. No specific family could be identified from the static analysis.

Heuristics 5

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/Yyr.5xQB9Uu 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` `4225524e91f62f7c94da650552f5c8aed888e174a6f726e27a711f97536620c6`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/Yyr.5xQB9Uu	1575424 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` `fcf3987341210ce5dfe023387f11de6bd1d207a6ffbad35176262a55a6fa7f14`	ole-package	OOXML xl/embeddings/Yyr.5xQB9Uu Ole10Native stream: Ole10NAtive	1560174 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.