CobaltStrike_Resources_Beacon_x64_v3_8

rule CobaltStrike_Resources_Beacon_x64_v3_8
{
  meta:
    description = "Cobalt Strike's sleeve/beacon.x64.dll Versions 3.8"
    hash =  "547d44669dba97a32cb9e95cfb8d3cd278e00599e6a11080df1a9d09226f33ae"
		author = "gssincla@google.com"
		reference = "https://cloud.google.com/blog/products/identity-security/making-cobalt-strike-harder-for-threat-actors-to-abuse"
		date = "2022-11-18"
    
    id = "89809d81-9a8b-5cf3-a251-689bf52e98e0"
  strings:
    /*
      8B D3          mov     edx, ebx
      48 8B CF       mov     rcx, rdi
      E8 7A 52 00 00 call    sub_18001269C
      EB 0D          jmp     short loc_18000D431
      45 33 C0       xor     r8d, r8d
      8B D3          mov     edx, ebx
      48 8B CF       mov     rcx, rdi; Src
      E8 8F 55 00 00 call    sub_1800129C0
    */

    $version_sig = { 8B D3 48 8B CF E8 7A 52 00 00 EB 0D 45 33 C0 8B D3 48 8B CF
                     E8 8F 55 00 00 }
    
    /*
      80 34 28 ??       xor     byte ptr [rax+rbp], 69h
      48 FF C0          inc     rax
      48 3D 00 10 00 00 cmp     rax, 1000h
      7C F1             jl      short loc_18001772E
    */
    $decoder = { 80 34 28 ?? 48 FF C0 48 3D 00 10 00 00 7C F1 }

  condition:
    all of them
}