Office (OOXML) / .XLSX malware analysis — malicious · 32ff778bc5a4690c

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: 19ecf7d5ea881df9df7f3854ecae1a85 SHA-1: 19a4823be7b8a713cfa464c9304bf8c5b327f353 SHA-256: 32ff778bc5a4690c3b6d1c6ef94cddadd1e57535ed74c08b648e33294ab946be

142 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1559.001 Component Object Model Hijacking

The file is an Excel document containing an embedded OLE object, specifically a Microsoft Equation Editor object. Heuristics indicate this object is anomalous and likely contains a malicious payload, exploiting CVE-2018-0798. The embedded artifact 'ooxml_oleobject_00_ole10native_00.bin' is identified as the potential payload carrier.

Heuristics 5

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/pnL0.K3Co4Q 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` `f29063ff2dfbd8717948b2b6aad4581f49996a2fc7fbec24163a76bd4c69e702`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/pnL0.K3Co4Q	2106368 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` `f15ed6c391c4f430b13c1adb6c1911c68449060b24bc9c2fdce71836b40ca136`	ole-package	OOXML xl/embeddings/pnL0.K3Co4Q Ole10Native stream: oLe10NativE	2087370 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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