Office (OOXML) / .XLSX malware analysis — malicious · b7626aba05386055

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: 26cd9fefc8df58a3ef11f6431b7488e2 SHA-1: 2dd73e11c074f1f32601253e1ba93d780336949c SHA-256: b7626aba05386055ea2b7ab1f427b6610a27d307c99fa95bf5f3b3ee3b8eeb40

142 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious Link T1204.002 Malicious File T1559 Component Object Model Hijacking T1559.001 Component Object Model

The file is an Excel spreadsheet containing an embedded OLE object, specifically an Equation Editor object. Heuristics indicate this object exploits CVE-2018-0798 due to anomalous native stream properties and high entropy, suggesting it carries a malicious payload. The embedded artifact 'xl/embeddings/Red4z.Ax7hn' is the likely carrier of this exploit.

Heuristics 5

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/Red4z.Ax7hn 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` `190a9cc190337624a9032c5fb0e96338941dc080931b1c8319d155ed46b9b595`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/Red4z.Ax7hn	1654272 bytes
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` `564a694b1dd4555f0ff19b59a4743e45fd3f20632c650d1787ea8c4029f9fb6f`	ole-package	OOXML xl/embeddings/Red4z.Ax7hn Ole10Native stream: oLe10NativE	1638817 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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