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

Static analysis result for SHA-256 64ffb892f36ecef1…

MALICIOUS

Office (OOXML) / .XLSX

739.9 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2024-06-11
MD5: 7b4704ee4ca60a1e8cc3eca7c3444389 SHA-1: c304d3bbe3d3ffe24a085e91709779506b586b98 SHA-256: 64ffb892f36ecef149e351748507afd769574222f7cf621029e8fe1ac76134fe
100 Risk Score

Malware Insights

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

The sample is an OOXML document containing 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 with an anomalous size difference, strongly suggesting exploitation of a vulnerability within the Equation Editor. This technique is commonly used to deliver secondary malicious payloads.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/fXSYM.Va0hwh 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
39dc2b09aceb6ee95ebe6bb7e9f01030895c1f2db8130dad7e1e521607b86dee		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/fXSYM.Va0hwh 991232 bytes
ooxml_oleobject_00_ole10native_00.bin
d5d5a1bdc470007f764d5d0923ee047973777dff2be726d0e94fa8bcb1881d47		 ole-package OOXML xl/embeddings/fXSYM.Va0hwh Ole10Native stream: OlE10NaTiVE 980616 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.