Office (OOXML) / .XLSX malware analysis — malicious · 38248e4abbb79477

MALICIOUS

Office (OOXML) / .XLSX

951.8 KB Created: 2021-08-09 02:12:21 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2022-09-16

MD5: 56258d9a9686619e2d99b775f9c61b5e SHA-1: 8483b99647cb7cd6aca744c8b133345d683ab502 SHA-256: 38248e4abbb794775800489047e3468634d7816232dbb23160528ee171932bfe

142 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1559.001 Component Object Model Hijacking

The file is an Excel document containing an embedded Equation Editor OLE object. Heuristics indicate this object is anomalous and likely carries a payload, exploiting CVE-2018-0798. The embedded object's stream 'Ole10NAtIVE' is suspicious due to an impossible header and high entropy, suggesting it's a disguised second-stage exploit or payload.

Heuristics 5

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/Vox6q.9x 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` `41d3a6d3f467547da820e400421e85f06064fe7cad049ed0304669f4b212884f`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/Vox6q.9x	1210880 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.67, consistent with packed or encrypted content.
`ooxml_oleobject_00_ole10native_00.bin` `b1369b7445320e161d376210bbb21d4a2a6f3560e2dd0e8a18d506c1eb45a108`	ole-package	OOXML xl/embeddings/Vox6q.9x Ole10Native stream: Ole10NAtIVE	1198938 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.66, consistent with packed or encrypted content.

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