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

Static analysis result for SHA-256 2eb161f71d7d7661…

MALICIOUS

Office (OOXML) / .XLSX

735.6 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-09-29
MD5: c7d17f56b41044cd971c75500b4d73bf SHA-1: ba467cfa40a966551486d1413cd708aa802f7361 SHA-256: 2eb161f71d7d7661cac272f5a3906e4257c0d65bd70435c9aba8f4344c8e4b7c
100 Risk Score

Malware Insights

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

The file is an Excel document containing an embedded OLE object, specifically identified as a vulnerable Equation Editor object. This object carries a payload-like Ole10Native stream, indicating an exploit attempt. The large declared inner size compared to the stream size suggests a potential buffer overflow or similar vulnerability is being leveraged.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/lMjLjX.r7nM5C 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
f353bb3ed836acf69adaac366bd1959609aa461898cb8fcd312fbe23780116f9		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/lMjLjX.r7nM5C 999936 bytes
ooxml_oleobject_00_ole10native_00.bin
1d05f5109b2ca58b1d20a756246128e42005a1d3efc4f654e58704065ddcf910		 ole-package OOXML xl/embeddings/lMjLjX.r7nM5C Ole10Native stream: OLe10nAtIVE 989530 bytes

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