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

Static analysis result for SHA-256 3fadc8328d153710…

MALICIOUS

Office (OOXML) / .XLSX

643.1 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-03-30
MD5: 261b190ae596593e2c77c64d170d7d76 SHA-1: 12a78764918fc40baa8e70ef4cfbf562c38fd74b SHA-256: 3fadc8328d153710ca24a8122faa0870b56c1884d55526491364a9b0344f0ba9
140 Risk Score

Malware Insights

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

The sample is an OOXML file containing an embedded OLE object, specifically identified as a vulnerable Equation Editor object. High-severity 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 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/NH3lIdyFG.b0 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
0bc4df7e44c60941393534a5b3b2dce0c5e289caa1e40f01c5a1e035619ec103		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/NH3lIdyFG.b0 896000 bytes
ooxml_oleobject_00_ole10native_00.bin
72631c31bce5c18d818acafb577efcae51d33ff1995b9e5b9f7002f5f5b87670		 ole-package OOXML xl/embeddings/NH3lIdyFG.b0 Ole10Native stream: OLe10natIVE 886585 bytes

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