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

Static analysis result for SHA-256 20e7c3d66e4c5e04…

MALICIOUS

Office (OOXML) / .XLSX

666.7 KB Created: 2023-08-03 11:34:29 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2023-08-08
MD5: a82f3e587663e78bb7576cb6be6ad184 SHA-1: a533bb3078bf9f1866d4151da14420a5956a1ab9 SHA-256: 20e7c3d66e4c5e0491ec13387d678f534fc014b26e45e9eefffa1b4730eab88f
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The file is an Excel 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 with an anomalous size difference, strongly suggesting it's used to exploit a vulnerability. This is a common delivery mechanism for malware, often initiated via spearphishing.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/394f2sB.77D 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
4e4cacf08cfde2ac392b2282db02bcbd03dc5596dcb5f4d394f4fa7919096078		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/394f2sB.77D 930816 bytes
ooxml_oleobject_00_ole10native_00.bin
fb143fdc5238d0ae27c90e32621812539a1c54261060cfa165de8c2c651a7afa		 ole-package OOXML xl/embeddings/394f2sB.77D Ole10Native stream: oLe10NaTiVE 920973 bytes

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