CobaltStrike_Sleeve_Beacon_x64_v4_3

rule CobaltStrike_Sleeve_Beacon_x64_v4_3
{
  meta:
    description = "Cobalt Strike's sleeve/beacon.x64.dll Version 4.3"
    hash =  "3ac9c3525caa29981775bddec43d686c0e855271f23731c376ba48761c27fa3d"
		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 = "572616c7-d1ec-5aa1-b142-4f2edf73737f"
  strings:
  
    /*
      8B D0                mov     edx, eax
      49 8B CA             mov     rcx, r10; Source
      48 83 C4 28          add     rsp, 28h
      E9 D3 88 FF FF       jmp     f_OTH__CommandAbove_10
      4C 8D 05 84 6E FF FF lea     r8, f_NET__ExfiltrateData
      8B D0                mov     edx, eax
      49 8B CA             mov     rcx, r10
      48 83 C4 28          add     rsp, 28h
    */

    $version_sig = { 8B D0 49 8B CA 48 83 C4 28 E9 D3 88 FF FF
                     4C 8D 05 84 6E FF FF 8B D0 49 8B CA 48 83 C4 28 }
  
    /*
      80 34 28 ??       xor     byte ptr [rax+rbp], 2Eh
      48 FF C0          inc     rax
      48 3D 00 10 00 00 cmp     rax, 1000h
      7C F1             jl      short loc_1800186E1
    */
    $decoder = { 80 34 28 ?? 48 FF C0 48 3D 00 10 00 00 7C F1 }

  condition:
    all of them
}