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

Static analysis result for SHA-256 f8a08e69d16a7782…

MALICIOUS

Office (OOXML) / .XLSX

682.6 KB Created: 2022-07-21 17:04:09 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2023-04-20
MD5: afa6fb724f870e602245ecf17e80889b SHA-1: c8c845bcb8149b87e754bf423aa4ff8952fb3466 SHA-256: f8a08e69d16a77829c10cdcaacc23bbce051d6f729fbd551a05a3aa0a4312305
120 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1566.002 Spearphishing Attachment T1059.005 Visual Basic

The sample is an Excel document containing an embedded Equation Editor OLE object with an anomalous Ole10Native stream, indicating it carries a payload. The document body contains a lure instructing the user to 'enable editing' to view the content, a common tactic to bypass macro security. This suggests the embedded object is designed to be executed upon enabling macros, likely to download and execute a secondary payload.

Heuristics 4

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/fVBiugD.ghP6z 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
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ooxml_oleobject_00.bin
7e161f0ac6d50328d8750f1018b44b6fd17f006fcc61fc7b319fdecf98bfbf90		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/fVBiugD.ghP6z 934400 bytes
ooxml_oleobject_00_ole10native_00.bin
05b014e8466fa41de26c654a2022b56ca555fa6e7c371061d4557a308cdc5100		 ole-package OOXML xl/embeddings/fVBiugD.ghP6z Ole10Native stream: oLe10naTIVe 924261 bytes

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