Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 34f98b2c95a65ea8…

MALICIOUS

Office (OOXML)

68.4 KB Created: 2021-07-02 10:41:01 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2021-07-07
MD5: 1a44a98d07c150fe1b233ccfdff350c9 SHA-1: 9cc39ba1c2e292ee1a09566846cd44937e8f5548 SHA-256: 34f98b2c95a65ea8aedff34a89f6871a31106b916a4fe42ee7b4f056a7526fe1
122 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment

The sample contains a critical heuristic indicating a malicious DDE link within an Excel spreadsheet. This link is configured to execute a PowerShell command that downloads a JAR file from 'https://Clas.github.io' and saves it as '%tmp%\GPEGN.jar', subsequently executing it. This indicates a downloader or dropper functionality, likely delivered via spearphishing.

Heuristics 3

  • ClamAV: Xml.Exploit.DDE_Abuse-9987933-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xml.Exploit.DDE_Abuse-9987933-1
  • Spreadsheet DDE link launches a dangerous command critical OOXML_SPREADSHEET_DDE_MALICIOUS
    Excel workbook contains an externalLinks/ddeLink entry whose ddeService/ddeTopic launches a dangerous executable. This is SpreadsheetML DDE command execution, distinct from WordprocessingML DDE field instructions.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://Clas.github.io In document text (OOXML body / shared strings)

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