Office (OOXML) malware analysis — malicious · 8b45ed1165b3db98

MALICIOUS

Office (OOXML)

2.03 MB Created: 2021-03-23 07:05:13 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2021-05-15

MD5: 1ecc4883c92849d17f0fbb279e985ce5 SHA-1: 245f7596cabc9ff3d80dac9cb85021debe89bca3 SHA-256: 8b45ed1165b3db98233b571659f96589a445c8e864f8360a19477085914842cc

142 Risk Score

Heuristics 5

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/FEGbye.XmkzEF 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`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/FEGbye.XmkzEF	2372608 bytes
SHA-256: `b811f3cf75bdeb92786cad94068446bd4a168e4a1fcfa16df50c86539bc41024`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.97, consistent with packed or encrypted content.
`ooxml_oleobject_00_ole10native_00.bin`	ole-package	OOXML xl/embeddings/FEGbye.XmkzEF Ole10Native stream: Ole10Native	2351393 bytes
SHA-256: `e512cacb6eef7df0896e019672564021d694ad37566578d099e88093de5df88e`
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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