Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 9ef622360b8ef0fe…

MALICIOUS

Office (OOXML)

79.9 KB Created: 2021-07-02 10:43:21 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2021-07-07
MD5: 885fde4fb1249df69c5754625c47fb3b SHA-1: 773e001a823a296aad2ba6b44f322276d1c5003a SHA-256: 9ef622360b8ef0fe21620d75f685009422d7c61919a88628de7a9296e91b087f
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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