Malicious Office (OOXML) / .XLSX — malware analysis report

Static analysis result for SHA-256 eb235333cdc6dce3…

MALICIOUS

Office (OOXML) / .XLSX

706.9 KB Created: 2023-08-03 11:34:29 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2024-08-16
MD5: 43053c8ae705f54f3bbd90c302d9827c SHA-1: 5f6953594c961da5a8d15667f667ece3a28876c6 SHA-256: eb235333cdc6dce3cba95b1a3eb2a103507b5dc023e9c4c82240e24e0055d6e4
100 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1566 Phishing T1204.001 Malicious Link: Malicious File T1566.001 Phishing: Spearphishing Attachment

The file is an Excel spreadsheet containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. This object carries a payload within its Ole10Native stream, indicated by an anomalous header and size discrepancy. This strongly suggests the exploitation of a known vulnerability within the Equation Editor to execute a malicious payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/nIFhNRNpb.2aIIOYd 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ooxml_oleobject_00.bin
59bb70c7e9577a20c655705d025ebabb276171a51b3c5a66586380ce3ac826db		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/nIFhNRNpb.2aIIOYd 1009152 bytes
ooxml_oleobject_00_ole10native_00.bin
ac8a231970e09d9d88b7460af05164ba26a4edeae9a9e413c3dbd2e4153272af		 ole-package OOXML xl/embeddings/nIFhNRNpb.2aIIOYd Ole10Native stream: oLE10nAtivE 998760 bytes

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