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

Static analysis result for SHA-256 7d7435872eaf0369…

MALICIOUS

Office (OOXML) / .XLSX

625.9 KB Created: 2023-09-27 08:05:40 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-10-05
MD5: 41da9a956347c92b54275e913a561fdf SHA-1: da5911727f0121e59a17b6b0e6021c68f4bc3ccd SHA-256: 7d7435872eaf0369dc06058489df154db82ce0acfbe6c78e1d1c81a6b94d6019
100 Risk Score

Malware Insights

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

The file contains an embedded OLE object identified as an Equation Editor, which is a known vector for delivering malicious payloads. The 'OLE_EQUATION_OLE10NATIVE_PAYLOAD_ANOMALY' heuristic indicates that the Equation Editor object contains an anomalous Ole10Native stream, suggesting it carries a payload. The large declared inner size compared to the stream size further supports this, indicating potential obfuscation or a packed payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/SvezbO.2tNPoN 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
e9b83e50ac04ee2d9e42cc1b8ae123aea02f1db7dcd04569e7fbe87ae6cacd09		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/SvezbO.2tNPoN 937472 bytes
ooxml_oleobject_00_ole10native_00.bin
19903bdc8a6aab3759cf6df19a09c3f2ad1c219aadb972a520a0bd300c70c4cd		 ole-package OOXML xl/embeddings/SvezbO.2tNPoN Ole10Native stream: oLE10natiVe 927421 bytes

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