CobaltStrike_Resources_Beacon_x64_v3_4

rule CobaltStrike_Resources_Beacon_x64_v3_4
{
  meta:
    description = "Cobalt Strike's sleeve/beacon.x64.dll Versions 3.4"
    hash =  "5a4d48c2eda8cda79dc130f8306699c8203e026533ce5691bf90363473733bf0"
		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 = "97ef152c-86c7-513c-a881-e7d594d38dcf"
  strings:
    /*
      8B D3             mov     edx, ebx
      48 8B CF          mov     rcx, rdi
      E8 56 6F 00 00    call    sub_180014458
      E9 17 FB FF FF    jmp     loc_18000D01E
      41 B8 01 00 00 00 mov     r8d, 1
      8B D3             mov     edx, ebx
      48 8B CF          mov     rcx, rdi
      E8 41 4D 00 00    call    sub_180012258
      48 8B 5C 24 30    mov     rbx, [rsp+28h+arg_0]
      48 83 C4 20       add     rsp, 20h
    */
    $version_sig = { 8B D3 48 8B CF E8 56 6F 00 00 E9 17 FB FF FF
                     41 B8 01 00 00 00 8B D3 48 8B CF E8 41 4D 00 00
                     48 8B 5C 24 30 48 83 C4 20 }

    /*
      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_18001600E
    */
    
    $decoder = { 80 34 28 ?? 48 FF C0 48 3D 00 10 00 00 7C F1 }
    
  condition:
    all of them
}