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

Static analysis result for SHA-256 381ddde21b2c8789…

MALICIOUS

Office (OOXML) / .XLSX

609.7 KB Created: 2022-08-10 18:51:50 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2024-08-17
MD5: a5c16f5a6e04fee10c58a72189305e94 SHA-1: dbfc5420803daa12c373bc9713fd0de8ec0a251c SHA-256: 381ddde21b2c87893dc81ab04d52086d25722f6bea79db2317896c54b29aaaf4
100 Risk Score

Malware Insights

MITRE ATT&CK
T1559.001 Component Object Model Hijacking T1204.002 Malicious File

The file is an Office document containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. Heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous header, suggesting it's designed to exploit a vulnerability. The document body appears to be a fabricated financial or shipping document, likely a lure to entice the user to interact with the malicious embedded object.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/Q958m8C.1Az 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
978ce8bb38252ff07545cf1d6927962876eb816db8ed0630d1a1ce54c30bedc7		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/Q958m8C.1Az 820224 bytes
ooxml_oleobject_00_ole10native_00.bin
539ba188380ae3523ced79809783e86ec02581a1379a1dd81ea45436de8573da		 ole-package OOXML xl/embeddings/Q958m8C.1Az Ole10Native stream: ole10naTIve 811043 bytes

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