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

Static analysis result for SHA-256 fe79fe3caf74c3fc…

MALICIOUS

Office (OOXML) / .XLSX

604.8 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-09-11
MD5: 319c838f4c7eff50319e9ef55494359b SHA-1: 6757f118cf9ece75e9223d068d7b380dadb1199c SHA-256: fe79fe3caf74c3fc5cbb618b9a0e9015edf85cdc8cc86f0f4ca7c9e8301ba18d
100 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 vulnerable Equation Editor object. High-severity heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous size, strongly suggesting exploitation. The embedded OLE object is the primary vector for delivering the malicious payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/jS8.1a8gg 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
84fe99741dcf80cf2612475e8493d7f386692af91a97b51a32338209a557d103		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/jS8.1a8gg 807936 bytes
ooxml_oleobject_00_ole10native_00.bin
211cafe29d0ada640e31f7e09aa81b97a472285016411177e2454a2bcff9787b		 ole-package OOXML xl/embeddings/jS8.1a8gg Ole10Native stream: OlE10naTIVe 798799 bytes

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