Office (OOXML) / .XLSX malware analysis — malicious · b692379fa52eabc7

MALICIOUS

Office (OOXML) / .XLSX

1.12 MB Created: 2022-11-18 02:05:27 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2022-11-28

MD5: bfb27a69e5ee3cc4204f7efce811640d SHA-1: 5ff75a31061d95e8a3ac552ff2b08cd9baf989bc SHA-256: b692379fa52eabc7dfcf35dfc0c8da38e1ea83e76ef5f6f9405aa2845aaf6c11

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 Microsoft Equation Editor object. Heuristics indicate this object is anomalous and likely contains a payload, exploiting CVE-2018-0798. The embedded object's stream 'olE10NatIVe' has a declared size far exceeding its actual stream size and high entropy, strongly suggesting it's a packed or encrypted second-stage payload.

Heuristics 5

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/Gw.30 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` `b412598980ac5f975c03fc17fba96de1213210cd83bd060282f4b7c23451f200`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/Gw.30	1440768 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` `1517561f43429b0fe398063dc2fa530fa871ee078dde86d281724e9f3378a61f`	ole-package	OOXML xl/embeddings/Gw.30 Ole10Native stream: olE10NatIVe	1426968 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 8.00, consistent with packed or encrypted content.

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