Office (OOXML) malware analysis — malicious · b9dd539a19d64070

MALICIOUS

Office (OOXML)

1.70 MB Created: 2021-02-03 07:57:22 UTC Authoring application: Microsoft Excel 15.0300

MD5: 7d586f7ed083f044071b4f6016bfae67 SHA-1: 04f4736048013b325b240aa9635a4fdb921ffde4 SHA-256: b9dd539a19d6407003ca249983f47592b52a0c525818fee802b89a83c2eebdbd

142 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution

The file is an Excel document containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. Heuristics indicate this object is anomalous and likely carries a malicious payload, exploiting CVE-2018-0798. This suggests the document is designed to execute arbitrary code upon opening or interaction with the embedded object.

Heuristics 5

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/E8Z2ofU2m.S3 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` `3baef7c0d7f74bd1c3379d2cc82da1a4bf893d931538c5efdd2d764d194969a7`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/E8Z2ofU2m.S3	2095104 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` `85ba61ab78da51c84224c29d3d7d5a70e56f632fabe22f387860ede3598b48f9`	ole-package	OOXML xl/embeddings/E8Z2ofU2m.S3 Ole10Native stream: ole10nativE	2076639 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.99, consistent with packed or encrypted content.

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