Office (OOXML) malware analysis — malicious · ec23f79611fe58e6

MALICIOUS

Office (OOXML)

1.80 MB Created: 2021-07-06 07:12:03 UTC Authoring application: Microsoft Excel 16.0300

MD5: 9882be1363faee04f345a68471d0a8b1 SHA-1: a4bbfc715f6156d7df98ed112c8f7c81b9eed2b5 SHA-256: ec23f79611fe58e6f36f3062328011fa4cc7ebd89a1a0624e0b822992c160a78

142 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The sample is an Office document containing an embedded OLE object, specifically identified as a vulnerable Equation Editor component. Heuristics indicate anomalies consistent with CVE-2018-0798, suggesting the Equation Editor object is used to deliver and execute a malicious payload. The embedded OLE object and its associated streams are the primary indicators of compromise.

Heuristics 5

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/HE.5gXWb7W 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` `3420def35c7e7ee77c006814a22091ace465c09d6b8c11db0c1544550ebfdf56`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/HE.5gXWb7W	1989632 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` `bc7ca721cfd123afd39954f684c6a4ec2dad0f574b08cbdeb7ea376549b0bc6b`	ole-package	OOXML xl/embeddings/HE.5gXWb7W Ole10Native stream: oLe10NaTIvE	1971450 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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