EXPL_HKTL_LNX_DirtyFragShellcode_May26

rule EXPL_HKTL_LNX_DirtyFragShellcode_May26 {
   meta:
      description = "Detects a shellcode observed in dirtyfrag, a local privilege escalation exploit for Linux."
      reference = "https://github.com/V4bel/dirtyfrag/tree/master"
      author = "Pezier Pierre-Henri (Nextron Systems)"
      date = "2026-05-07"
      score = 80
      hash = "a02ea2ba8108a9b7a997faa8808cfc55bb69af54e69178fa5aa1785681cf0ced"
      id = "c156da87-c029-5084-9cd3-a233fefdaf25"
   strings:
      $op1 = {
         31 ff     // xor     edi, edi
         31 f6     // xor     esi, esi
         31 c0     // xor     eax, eax
         b0 6a     // mov     al, 6Ah ; 'j'
         0f 05     // syscall; LINUX - sys_setgid
         b0 69     // mov     al, 69h ; 'i'
         0f 05     // syscall; LINUX - sys_setuid
         b0 74     // mov     al, 74h ; 't'
         0f 05     // syscall; LINUX - sys_setgroups
         6a 00     // push    0
         48 [6]    // lea     rax, aTermXterm; "TERM=xterm"
         50        // push    rax
         48 89 e2  // mov     rdx, rsp
         48 [6]    // lea     rdi, aBinSh; "/bin/sh"
         31 f6     // xor     esi, esi
         6a 3b     // push    3Bh ; ';'
         58        // pop     rax
         0f 05     // syscall; LINUX - sys_execve
      }
   condition:
      $op1
}