Office (OOXML) / .XLSX malware analysis — malicious · a65ac3514d74b945

MALICIOUS

Office (OOXML) / .XLSX

1.37 MB Created: 2021-09-22 12:07:42 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2022-06-14

MD5: 35284cdaa12335579cccd40564bba6e8 SHA-1: 1fe2f9778970f7ad80ab5e5e5fb4745dc5116ec4 SHA-256: a65ac3514d74b9450c8951bdac22ab8db910a74718a074c4a009c704222d9030

142 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious Link T1566.001 Spearphishing Attachment T1204.001 Malicious Link

This XLSX file contains an embedded OLE object, specifically an Equation Editor object, which is known to be exploited via CVE-2018-0798. The object's Ole10Native stream exhibits high entropy and a size anomaly, indicating it likely carries a malicious payload. The embedded artifact 'xl/embeddings/1NgHvsnRD.TlOAJ' is the primary indicator of this exploit.

Heuristics 5

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/1NgHvsnRD.TlOAJ 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` `c84cd9e4ec8f0eec618f772bf212713ead42a39e1d47db2f29d77f25436de8dc`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/1NgHvsnRD.TlOAJ	1752576 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` `ffb5ddffea9c9bfd6037fdb7da19413c23ee1d8993c0775dcbc75f7771eaef30`	ole-package	OOXML xl/embeddings/1NgHvsnRD.TlOAJ Ole10Native stream: ole10nATIVE	1736419 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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