Office (OOXML) / .XLSX malware analysis — malicious · 2d46eee159ec36ab

MALICIOUS

Office (OOXML) / .XLSX

1.24 MB Created: 2022-11-18 02:05:27 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-01-18

MD5: 27f586f26da21955c782e9268ad1c4ce SHA-1: b9be1204d078c487f6ade5e2a6cd2164c46a7996 SHA-256: 2d46eee159ec36ab5e9f8bc29a7e0464c9b1be8c3454cdb8c9880640dcfda02f

142 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious Link T1204.002 Malicious Link: Malicious File T1559 Component Object Model Hijacking T1559.001 Component Object Model Hijacking: Component Object Model Hijacking

The sample is an Excel spreadsheet containing an embedded OLE object, specifically an Equation Editor object. Heuristics indicate this object is anomalous and likely contains a payload, exploiting CVE-2018-0798. The embedded object's structure and high entropy suggest it's designed to execute arbitrary code upon interaction, likely leading to the download and execution of a secondary malicious payload.

Heuristics 5

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/KQtOgCMy.jGwZO 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` `ef50dff54d2a4171157d09a30db38aae8cfd702bf44d0ab6efc7c3a511dc955b`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/KQtOgCMy.jGwZO	1522688 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` `d286853a21ca7d749986b270554d3e1239293dc76a1b1760d7a5c71d49b56033`	ole-package	OOXML xl/embeddings/KQtOgCMy.jGwZO Ole10Native stream: ole10NATIVe	1508006 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.