Office (OOXML) / .XLSX malware analysis — malicious · 6375b50616f861d2

MALICIOUS

Office (OOXML) / .XLSX

1.37 MB Created: 2021-03-23 07:05:13 UTC Authoring application: Microsoft Excel 12.0000

MD5: d630fc19fa594aa083777978c2ac905b SHA-1: 3a591ab2d87dd077a75260886d2c16f469289874 SHA-256: 6375b50616f861d29d660ab434f9f87bf96a18c4b651e4cd4c97ee96c22dd6e7

142 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution

The file is an Excel spreadsheet containing an embedded OLE object, specifically an Equation Editor object. Heuristics indicate that this object is anomalous and carries a payload, strongly suggesting exploitation of CVE-2018-0798 or a similar vulnerability in the Equation Editor to achieve code execution.

Heuristics 5

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/sHYrV5Gl5.KfHkt 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` `2f88436fe4750535335643c76e5e400bc374a6793ae046373a0e3ca64bb33981`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/sHYrV5Gl5.KfHkt	1661440 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` `4ece19a37f4f701933b20fdcc96b15d4a33c314711a5372ae59ccfd405052650`	ole-package	OOXML xl/embeddings/sHYrV5Gl5.KfHkt Ole10Native stream: Ole10Native	1645607 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.