Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 3cdfe5bc45d1d79b…

MALICIOUS

Office (OOXML)

10.8 KB Created: 2018-09-07 06:04:00 UTC Authoring application: Microsoft Office Word 12.0000 First seen: 2019-11-20
MD5: 72799fc4208fd4246bfa95cb07fae1a4 SHA-1: 498e73377ad38cb0ab34df64f5ee76a9640b5c53 SHA-256: 3cdfe5bc45d1d79bbaa8be12ef386e5fcb50fcf4b4446e2663c1d8ce405e45f9
170 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample contains a critical DDE AUTOEXEC heuristic firing, indicating a malicious DDE command. This command attempts to execute mshta.exe with a URL, which is a common technique for downloading and executing a second-stage payload. The ClamAV detection further confirms the malicious nature of the file.

Heuristics 5

  • ClamAV: Doc.Exploit.DDEautoexec-6361400-2 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Exploit.DDEautoexec-6361400-2
  • Malicious DDE command critical OOXML_DDE_MALICIOUS
    DDE field in word/document.xml launches a dangerous executable: \\Microsoft\\Office\\MSword.exe\\..\\..\\..\\..\\windows\\sy
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • External hyperlinks (1) low OOXML_EXTERNAL_HYPERLINKS
    Document contains 1 external hyperlink — clickable URLs are stored as external relationships. First target: http://192.168.45.221:8080/7H9Ay5sT
  • 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 http://192.168.45.221:8080/7H9Ay5sT Document hyperlink
    • http://schemas.openxmlformats.org/markup-compatibility/2006In document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/officeDocument/2006/relationshipsIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/officeDocument/2006/mathIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/drawingml/2006/wordprocessingDrawingIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/wordprocessingml/2006/mainIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2006/wordmlIn document text (OOXML body / shared strings)

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