Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 ca8adf7ab50d8a6f…

MALICIOUS

Office (OOXML)

79.6 KB Created: 2021-07-02 10:42:10 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2021-07-07
MD5: 4b130bbd2279b218a748a80ae342fd36 SHA-1: 3249e85cc1b7a413d0699edc9ec299ed6e6e53db SHA-256: ca8adf7ab50d8a6fd6172154570f8832aabed966ce3b41c50f7f4925ec07c743
122 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is an Office document that leverages a DDE abuse vulnerability. The embedded command uses PowerShell to download a JAR file from 'https://Clas.github.io' and execute it. This indicates a likely multi-stage attack aiming to deliver a secondary payload.

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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