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

Static analysis result for SHA-256 df0dcbf2e2200b9b…

MALICIOUS

Office (OOXML) / .XLSX

628.8 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-07-31
MD5: 1378fac8e9d74f92bd206517dd9cf6f6 SHA-1: 781464d21e08fa22a54725b2769bd54427caaa42 SHA-256: df0dcbf2e2200b9b7443faf67f6f7746558f82df47894d87741bb090966f072f
100 Risk Score

Malware Insights

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

The sample is an Excel file containing an embedded OLE object, specifically identified as a vulnerable Equation Editor object. This object carries a payload-sized Ole10Native stream, indicating it's likely used to exploit a vulnerability and deliver a secondary malicious payload. The presence of the Equation Editor OLE object strongly suggests an attack pattern leveraging known exploits.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/4YUk.emTW 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
b46c594a5287c960c7b95395dfc7acff9970c75239e1908598b57106260042b2		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/4YUk.emTW 910336 bytes
ooxml_oleobject_00_ole10native_00.bin
7f89158568bfd74e682a943f31208019a8b6b20f8884d3bbacc27d86befd0bad		 ole-package OOXML xl/embeddings/4YUk.emTW Ole10Native stream: Ole10NaTIve 900864 bytes

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