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

Static analysis result for SHA-256 054677a69ab8ae59…

MALICIOUS

Office (OOXML) / .XLSX

712.1 KB Created: 2022-08-10 18:51:50 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2024-08-10
MD5: eb565551ff1219e68e000e85aed67800 SHA-1: e6dde285911586c30b27b880755c317395a593fb SHA-256: 054677a69ab8ae59ae3f2ca2b40da224ec71b8b8fe290699771a0acaab528044
100 Risk Score

Malware Insights

MITRE ATT&CK
T1559.001 Component Object Model Hijacking

The file is an Office document containing an embedded OLE object. Heuristics indicate this is an Equation Editor object that carries a payload-like Ole10Native stream, suggesting it's used to deliver a secondary exploit or malware. The large size and anomalous header of the Ole10Native stream further support this malicious intent.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/oAYWw.bSB 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
e0e67cb1f90f70c7f88a21209c5cbc2321f72a4943ebe9caf4ac5f6d26b6693d		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oAYWw.bSB 1050112 bytes
ooxml_oleobject_00_ole10native_00.bin
73a1c6e0cedb258e1c20dfe3cff37c80e4a72c8121d433db1bc9f1eeb5889465		 ole-package OOXML xl/embeddings/oAYWw.bSB Ole10Native stream: ole10NatIvE 1039341 bytes

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