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

Static analysis result for SHA-256 49de1eaf4a349233…

MALICIOUS

Office (OOXML) / .XLSX

618.7 KB Created: 2021-12-06 14:45:17 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2022-05-15
MD5: 8cf04169458b127ec9079df1dbf9db84 SHA-1: 55025e4bdc40b9e093cded56067793bcf859deb3 SHA-256: 49de1eaf4a349233d1162e03d999162880d25ecc247670aba82ae91e39ba702e
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The sample is an Office document containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. High-severity heuristics indicate that this Equation Editor object carries an anomalous Ole10Native stream, suggesting it is being used to deliver a payload. This is a common technique for exploiting vulnerabilities like CVE-2017-11882, leading to arbitrary code execution. No scripts were extracted, and no document body was available for analysis.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/771c77Cc.zyUobZ 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
241ed3febe2273849b507719bf467863fdf5db9d16f7e8d07692ac195771b80f		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/771c77Cc.zyUobZ 859136 bytes
ooxml_oleobject_00_ole10native_00.bin
a8fadee1f4309c61c6e2b296d82341e7971be44215f23c52639b4d3ab06c4ebf		 ole-package OOXML xl/embeddings/771c77Cc.zyUobZ Ole10Native stream: OLe10NATive 849581 bytes

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