Malicious RTF — malware analysis report

Static analysis result for SHA-256 8cf3bc2bf36342e8…

MALICIOUS

RTF

264 B First seen: 2019-03-18
MD5: 1d2c706e821076a59dcd38cf37dcf3c6 SHA-1: 66291f31ba162aa4c9cdea924c1b285fd34461ac SHA-256: 8cf3bc2bf36342e844e9c8108393562538a9af2a1011c80bb46416c0572c86ff
142 Risk Score

Malware Insights

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

The RTF document contains a DDE AUTO field that executes a obfuscated PowerShell command. This command is designed to download a second-stage executable from the URL http://86.106.131.177/link/GRAPH.EXE and save it to the user's AppData directory. The presence of the PowerShell execution and the download URL strongly indicate a downloader functionality.

Heuristics 4

  • ClamAV: Rtf.Downloader.Agent-6764199-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Rtf.Downloader.Agent-6764199-0
  • Reference to PowerShell high SC_STR_POWERSHELL
    Reference to PowerShell
  • 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://86.106.131.177/link/GRAPH.EXE In RTF body