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

Static analysis result for SHA-256 75c7d292c634cc83…

MALICIOUS

Office (OOXML) / .XLSX

741.5 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2024-06-06
MD5: 474a1c47a2b9825afc0600111d91188b SHA-1: 8bd144993780db68bda5a013a0a8384976742389 SHA-256: 75c7d292c634cc835884c8daa6d6a1b2c6f6322ce832812c23996c842613355e
140 Risk Score

Malware Insights

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

The file is an OOXML document containing an embedded OLE object, specifically identified as a 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 vulnerability.

Heuristics 4

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/dq.YusW 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
f9fef80c6ec5e5cf9311461ca9104375287bdd5321fafcc298f50e5abd7aae25		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/dq.YusW 1014272 bytes
ooxml_oleobject_00_ole10native_00.bin
8a692979fabcba6c089b14f896365ed39eb0e5ac87b107b95465120d946f2db7		 ole-package OOXML xl/embeddings/dq.YusW Ole10Native stream: OLE10native 1003725 bytes

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