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

Static analysis result for SHA-256 bcbff255ab9eb220…

MALICIOUS

Office (OOXML) / .XLSX

641.2 KB Created: 2023-08-03 11:34:29 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2024-06-15
MD5: 2d9b5945714ea805ce5f1cf030d4433a SHA-1: 4e4404fea5783dc087ee122528d1a54fafe986fe SHA-256: bcbff255ab9eb2201692467e5a33eada684a4b8c446d730a2f4820fb3c51eeb5
140 Risk Score

Malware Insights

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

The file contains an embedded OLE object, specifically identified as a Microsoft Equation Editor object. High-severity heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream, suggesting it is being used to exploit a vulnerability. The presence of a NOP sled further supports the exploitation of a buffer overflow or similar vulnerability.

Heuristics 4

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/rvhfI.gm1QmBx contains the Equation Editor CLSID, the legacy component exploited by CVE-2017-11882, CVE-2018-0802, and CVE-2018-0798.
  • NOP sled detected high SC_NOP_SLED
    Found 20+ consecutive 0x90 bytes
  • 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
243fb94058d0169c044d055f0c4b8075889bd31b4a2b4f951a21e4a47b5727e6		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/rvhfI.gm1QmBx 899584 bytes
ooxml_oleobject_00_ole10native_00.bin
e3a76ca5ffcae0e40de9559da0d1fa00b464c2611ebb565c959da3e3b67e30f7		 ole-package OOXML xl/embeddings/rvhfI.gm1QmBx Ole10Native stream: ole10NAtIve 890291 bytes

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