Office (OOXML) / .XLSX malware analysis — malicious · 0a0b295f224de6fd

MALICIOUS

Office (OOXML) / .XLSX

1.84 MB Created: 2021-09-22 12:07:42 UTC Authoring application: Microsoft Excel 12.0000

MD5: e6a2fb1862b646efd9f16b74aba41429 SHA-1: 1f5cb86dc2289d48769fa02041ed50d04c8d7d9c SHA-256: 0a0b295f224de6fde72016769bdff87301bb1b501616875dc124fe016d403703

142 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The file is an Excel document containing an embedded Equation Editor OLE object. Heuristics indicate this object is anomalous and carries a payload, specifically triggering CVE-2018-0798. This suggests the document is designed to exploit this vulnerability to execute a secondary payload upon opening.

Heuristics 5

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/8VFa.uo 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` `521dc01a86ead949febb7fc0ca6c026c9167d2a4c6141035de006408f4ffd993`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/8VFa.uo	2248192 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` `4b32dd7a6441e63ac0c9881381292e3f3735912f4c1cef5cefbb49a22fbaa8c1`	ole-package	OOXML xl/embeddings/8VFa.uo Ole10Native stream: Ole10Native	2227760 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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