Office (OOXML) / .XLSX malware analysis — malicious · b151939cdca75974

MALICIOUS

Office (OOXML) / .XLSX

1.51 MB Created: 2022-11-18 02:05:27 UTC Authoring application: Microsoft Excel 12.0000

MD5: 98812ee034dfed6387f4ca2271045188 SHA-1: e9314d1adbf81312ce8bde1ae2aa6ad53fa50dae SHA-256: b151939cdca75974fd96e6d19df314e10c55a76449784a531594c5602ce7bfa9

142 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1559.001 Component Object Model

The sample is an Excel file containing an embedded OLE object, specifically identified as a vulnerable Equation Editor object. Heuristics indicate the object exploits CVE-2018-0798, a known vulnerability in Equation Editor, and carries a payload within its Ole10Native stream. This suggests the file is designed to execute arbitrary code upon opening by leveraging this exploit.

Heuristics 5

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/EBjE1icQ.IwdKn 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` `bbafbc18761c71e1dc27934c779b2f54b3b05bc1ae671de9f14b1a17c3a5da3f`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/EBjE1icQ.IwdKn	1818624 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` `882034a719ae60466668740b890277c5bcda3603bc73b68226b5f90e4b96a346`	ole-package	OOXML xl/embeddings/EBjE1icQ.IwdKn Ole10Native stream: oLE10Native	1801978 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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