Office (OOXML) / .XLSX malware analysis — malicious · a93bcc7b82125638

MALICIOUS

Office (OOXML) / .XLSX

645.6 KB Created: 2022-07-21 17:04:09 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2023-05-18

MD5: ec57a75448122e6689ffa5faf908d597 SHA-1: 6dd1878ccf9ab0f58c4c7803dd52b6e6c69134f3 SHA-256: a93bcc7b8212563831338bb9515fb78dcbeaf824cb7a728fd960fbea58ea630f

120 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious Link T1204.002 Malicious Link: Malicious File T1566 Phishing T1566.001 Phishing: Spearphishing Attachment

The file is an Excel spreadsheet containing an embedded OLE object, specifically an Equation Editor object. This object exhibits anomalies in its Ole10Native stream, suggesting it carries a malicious payload. The document body contains a lure instructing the user to enable editing, a common technique to bypass security measures and execute embedded malicious content.

Heuristics 4

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/sGt4zt.jI contains the Equation Editor CLSID, the legacy component exploited by CVE-2017-11882, CVE-2018-0802, and CVE-2018-0798.
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
Macro/content-enable lure medium SE_ENABLE_LURE

Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`ooxml_oleobject_00.bin` `771eedc88e7cd6179bbb1e1b41b1504eff50355558957d63056bdfea68452cb9`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/sGt4zt.jI	955392 bytes
`ooxml_oleobject_00_ole10native_00.bin` `297cc2a7050f6f99285f0aba59422d7e0018e0aba2ca7a6bbdad50ab8a1a89ff`	ole-package	OOXML xl/embeddings/sGt4zt.jI Ole10Native stream: OLe10nATivE	945175 bytes

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