Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 ec00631cf3a5cb54…

MALICIOUS

Office (OOXML)

12.2 KB Created: 2021-06-08 07:02:00 UTC Authoring application: Microsoft Office Word 16.0000 First seen: 2021-06-20
MD5: d92d98bdbbeee3cdca4582bcb3209944 SHA-1: ca821cdbd1908e602f4f2b2eab2dfbd20980b22d SHA-256: ec00631cf3a5cb54e64722ff67743e8104a6389fb978f8663373786e5e11d16a
162 Risk Score

Malware Insights

MITRE ATT&CK
T1218.011 System Binary Proxy Execution: Rundll32 T1059.003 Command and Scripting Interpreter: Windows Command Shell T1566.001 Phishing: Spearphishing Attachment

The sample contains a malicious DDE command that leverages cmd.exe to execute regsvr32. This command attempts to download and execute a payload from the URL http://kronshtatd.ru/zp-17890-2021.06?rid=TN3stI5. The DDE execution is a common technique for initial execution and payload delivery in malicious documents.

Heuristics 4

  • ClamAV: Doc.Exploit.DDEautoexec-6346603-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Exploit.DDEautoexec-6346603-1
  • 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.
  • 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://schemas.microsoft.com/office/word/2010/wordprocessingCanvas In document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2014/chartexIn document text (OOXML body / shared strings)
    • 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.microsoft.com/office/word/2010/wordprocessingDrawingIn 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/2010/wordmlIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2012/wordmlIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2015/wordml/symexIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordprocessingGroupIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordprocessingInkIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2006/wordmlIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordprocessingShapeIn document text (OOXML body / shared strings)

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