Office (OOXML) / .XLSX malware analysis — malicious · ea01aa99918d6236

MALICIOUS

Office (OOXML) / .XLSX

38.2 KB Created: 2021-02-03 07:57:22 UTC Authoring application: Microsoft Excel 15.0300

MD5: ad121b33d234949f0e9d28ce12ef3537 SHA-1: ae1e7bba45cb14bec277aceb812bc17b8fcea07c SHA-256: ea01aa99918d6236c2e779649348e9f72205cee7154b21d6cfe6574dcbe6e19e

102 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution

The sample is an OOXML file containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. Heuristics indicate this object exploits CVE-2018-0798 due to anomalous native stream data. This technique is commonly used to achieve arbitrary code execution upon opening the document.

Heuristics 4

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.
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` `f746e8c0621aa9928b731b2ee071e03535e8f19d354354a2b04ba133c4344667`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/oleObject1.bin	34816 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.80, consistent with packed or encrypted content.
`ooxml_oleobject_00_ole10native_00.bin` `c3b2dd7ecedf44888f842edbb97bf0dcda96d1438940f5e8b47e56829790902c`	ole-package	OOXML xl/embeddings/oleObject1.bin Ole10Native stream: olE10nATIVe	31764 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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