Office (OOXML) / .XLSX malware analysis — malicious · 96f0a68a9256dbc0

MALICIOUS

Office (OOXML) / .XLSX

1.64 MB Created: 2022-03-31 04:25:31 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2022-07-14

MD5: a6d551d5d846acc191eef165c7417394 SHA-1: 0095123e9c4f39f773b042b664785198bc528b6f SHA-256: 96f0a68a9256dbc0fb767eda9369f5f7e59c610232214751c18d2f6297261b7b

142 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1559.001 Component Object Model

The file is an Office document containing an embedded OLE object, specifically identified as an Equation Editor object. Heuristics indicate exploitation of CVE-2018-0798 due to anomalous native stream properties and a payload-like Ole10Native stream. This suggests the document is designed to exploit this vulnerability for initial execution.

Heuristics 5

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/DuW.RG 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` `b04160477529e07bc688f8ecf2d40edd0be5ea3c3751076159e6406be721419e`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/DuW.RG	1932800 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` `f5bfe2030b03cdbb39b53050d74eaa065050736c835bc9084dc0838d04ea0ece`	ole-package	OOXML xl/embeddings/DuW.RG Ole10Native stream: OlE10NAtivE	1915314 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.