Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 c2b4ac7697fd7644…

MALICIOUS

Office (OOXML)

75.2 KB Created: 2021-07-02 10:46:10 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2021-07-07
MD5: aa9492993cf6c9c6b11a5d9797adc6c5 SHA-1: c88f7b3ba6a786ed9b57308323ddb76b1e6b3f7d SHA-256: c2b4ac7697fd764461cb3251eb663eba12c3091352e4a39f0c334658210a8cc1
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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