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

Static analysis result for SHA-256 42966f340c89006b…

MALICIOUS

Office (OOXML) / .XLSX

615.1 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-09-06
MD5: e5daacc364f0ebd109358a78303e7b4b SHA-1: fc4245b559ad8620620dda77adce0dd38f4bb6eb SHA-256: 42966f340c89006b3b11a95710f606e5c319efbd187f1ffcec9c16e04ec699f8
100 Risk Score

Malware Insights

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

The file is an Excel document containing an embedded OLE object, specifically identified as an Equation Editor object. 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 embedded OLE object and its anomalous stream are the primary indicators of malicious intent, likely leading to the execution of a secondary payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/NejiN0.LQJ 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
0e20258506fba6c9509e0205b11441f7495f960b5adfff5d47f833c9846826f2		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/NejiN0.LQJ 908288 bytes
ooxml_oleobject_00_ole10native_00.bin
de564c2ef6809bcc6cb3e1d067ba285bdc8afeb5d06b813f48e663a3c89bf6bc		 ole-package OOXML xl/embeddings/NejiN0.LQJ Ole10Native stream: oLe10NAtiVe 898692 bytes

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