Office (OOXML) malware analysis — malicious · bef9962d160834b3

MALICIOUS

Office (OOXML)

1.09 MB Created: 2019-11-27 10:48:55 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2020-05-25

MD5: 5ecb92683533b2bc1845cdcf070f4d8e SHA-1: ef8375b995170e7f4ebf40a51a6be42bfdf5bffd SHA-256: bef9962d160834b31379ea616875bdf879839a75a196896379b4d334cb9062f7

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 an Equation Editor object. High-severity heuristics indicate that this object is anomalous and likely contains a payload, exploiting CVE-2018-0798. The embedded object's native stream is suspicious and suggests arbitrary code execution capabilities.

Heuristics 5

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/oleObject1.bin 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/oleObject1.bin	1114112 bytes
SHA-256: `55767ab74544930212e9fdc04301a0cb8dcc6d058b343a7a1754bed93eb20021`
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`	ole-package	OOXML xl/embeddings/oleObject1.bin Ole10Native stream: oLE10natIve	1103152 bytes
SHA-256: `9fb44f5e8a3f7641d58dac018829354d2de159d7fc3ee9c93c6cf041024bc317`
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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