Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 b9fb546721de0d1d…

MALICIOUS

Office (OOXML)

73.2 KB Created: 2018-09-17 20:04:00 UTC Authoring application: Microsoft Office Word 12.0000 First seen: 2019-03-18
MD5: 0e7ff7f212d602e50e0a0b68e43a396c SHA-1: 35a1aa3a8bf35266c3455414a69b869cb8276017 SHA-256: b9fb546721de0d1da12dca9245f96a3261a4a302dd2ce776b6d193c5c3e08e0f
162 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1059.001 PowerShell

The sample contains a critical DDE AUTO command that executes cmd.exe. This command then uses PowerShell to download a second-stage executable from 'http://192.99.62.233/enjoy/Deffult/safe.exe' and save it as '%TMP%\ect.exe'. The script also creates and executes a batch file '%TMP%\cdb.bat' to manage the process. This indicates a downloader or dropper functionality.

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: \\system32\\cmd.exe
  • 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.openxmlformats.org/markup-compatibility/2006 In 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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