Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 45c7ff92a9aa4e01…

MALICIOUS

Office (OOXML)

73.1 KB Created: 2021-11-05 22:21:44 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2021-11-22
MD5: 0ca0dfc137344c935f17db07e66175e8 SHA-1: f331c2e7d089cca16efd45c9f04131ed67a7bf00 SHA-256: 45c7ff92a9aa4e01ba20e6428c6b15ff2c80b7bc40a6886f1c9a84b7354fa8e4
120 Risk Score

Malware Insights

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

The sample is an Excel document containing a malicious DDE link. This link is configured to execute a command-line that launches PowerShell. The PowerShell command decodes a Base64 string, which is likely a second-stage payload. The document body contains Thai text related to document creation and data entry, which appears to be a lure.

Heuristics 2

  • 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.

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