Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 af436c4c6a212403…

MALICIOUS

Office (OOXML)

72.3 KB Created: 2018-09-17 19:23:00 UTC Authoring application: Microsoft Office Word 12.0000 First seen: 2019-05-16
MD5: 3fc09d41022c128e05d7063bdb7f2acf SHA-1: 500c43588c722bdbea129c46abc80be801c5cbe9 SHA-256: af436c4c6a21240325cd8b351c644c2d4fe21b139e6cbadaa273a455337a6390
162 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File T1566.001 Spearphishing Attachment

The sample contains a critical DDEAUTO command that executes cmd.exe to run a PowerShell script. This script is designed to download a second-stage executable named 'safe.exe' from the IP address 192.99.62.233 and save it as '%TMP%\ect.exe'. It then executes this downloaded file via a batch script. 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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