CobaltStrike_Sleeve_Beacon_x64_v4_4_v_4_5_and_v4_6

rule CobaltStrike_Sleeve_Beacon_x64_v4_4_v_4_5_and_v4_6
{
  meta:
    description = "Cobalt Strike's sleeve/beacon.x64.dll Versions 4.4 through at least 4.6"
    hash = "3280fec57b7ca94fd2bdb5a4ea1c7e648f565ac077152c5a81469030ccf6ab44"
		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 = "79b6bfd4-1e45-5bd9-ac5c-19eb176ce698"
  strings:
    /*
      8B D0                mov     edx, eax
      49 8B CA             mov     rcx, r10; Source
      48 83 C4 28          add     rsp, 28h
      E9 83 88 FF FF       jmp     f_OTH__CommandAbove_10
      4C 8D 05 A4 6D 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 83 88 FF FF
                     4C 8D 05 A4 6D FF FF 8B D0 49 8B CA 48 83 C4 28 }

    /*
      80 34 28 2E       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_1800184D9
    */

    $decoder = { 80 34 28 ?? 48 FF C0 48 3D 00 10 00 00 7C F1 }

  condition:
    all of them
}