Office (OOXML) / .XLSX malware analysis — malicious · 372a5b41afc06f25

MALICIOUS

Office (OOXML) / .XLSX

3.90 MB Created: 2021-01-13 03:25:40 UTC Authoring application: Microsoft Excel 12.0000

MD5: f978cac45dfd04ded9c301c492d45c69 SHA-1: 63d3e614f29874274a2ee1434e4ec4a13b0a8ae2 SHA-256: 372a5b41afc06f25c0c2a27b4bb1a362f4fb9772deb9ad996a7dfe4ad7bd96e3

142 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1559.001 Component Object Model

The file is an Excel document containing an embedded OLE object, specifically identified as a vulnerable Equation Editor component. Heuristics indicate exploitation of CVE-2018-0798, suggesting the embedded object is designed to execute a malicious payload. The embedded artifact names and paths are included as IOCs.

Heuristics 5

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/SRrz6E.2DM1Ekf 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` `f0021cd97aeb98bd70cbe5f99f307803bcb976e35f4c47eb801c14f64ac736fe`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/SRrz6E.2DM1Ekf	4365312 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.93, consistent with packed or encrypted content.
`ooxml_oleobject_00_ole10native_00.bin` `3416fd6f0adb95ef14e2733b3828b443d5efa638657787a99a765183006f57ba`	ole-package	OOXML xl/embeddings/SRrz6E.2DM1Ekf Ole10Native stream: OLe10naTive	4328473 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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