Actor(s): BlackTech
PLEAD is a RAT used by the actor BlackTech. FireEye uses the synonyms GOODTIMES for the RAT module and DRAWDOWN for the respective downloader.
rule win_plead_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2026-09-17" version = "1" description = "Detects win.plead." info = "autogenerated rule brought to you by yara-signator" tool = "yara-signator v0.6.0" signator_config = "callsandjumps;datarefs;binvalue" malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.plead" malpedia_rule_date = "20260916" malpedia_hash = "53a643781c18e08f4a50949af60172d837a0b6f6" malpedia_version = "20260917" malpedia_license = "CC BY-SA 4.0" malpedia_sharing = "TLP:WHITE" /* DISCLAIMER * The strings used in this rule have been automatically selected from the * disassembly of memory dumps and unpacked files, using YARA-Signator. * The code and documentation is published here: * https://github.com/fxb-cocacoding/yara-signator * As Malpedia is used as data source, please note that for a given * number of families, only single samples are documented. * This likely impacts the degree of generalization these rules will offer. * Take the described generation method also into consideration when you * apply the rules in your use cases and assign them confidence levels. */ strings: $sequence_0 = { 59 5e c20400 8b4c2404 56 33f6 } // n = 6, score = 900 // 59 | pop ecx // 5e | pop esi // c20400 | ret 4 // 8b4c2404 | mov ecx, dword ptr [esp + 4] // 56 | push esi // 33f6 | xor esi, esi $sequence_1 = { 8b4514 56 881c30 ff15???????? 3bc3 } // n = 5, score = 900 // 8b4514 | mov eax, dword ptr [ebp + 0x14] // 56 | push esi // 881c30 | mov byte ptr [eax + esi], bl // ff15???????? | // 3bc3 | cmp eax, ebx $sequence_2 = { 56 e8???????? 40 50 6a01 ff15???????? 83c40c } // n = 7, score = 900 // 56 | push esi // e8???????? | // 40 | inc eax // 50 | push eax // 6a01 | push 1 // ff15???????? | // 83c40c | add esp, 0xc $sequence_3 = { ff15???????? 3dc8000000 59 754c } // n = 4, score = 900 // ff15???????? | // 3dc8000000 | cmp eax, 0xc8 // 59 | pop ecx // 754c | jne 0x4e $sequence_4 = { 66c745f25400 66895df4 66895df6 53 } // n = 4, score = 900 // 66c745f25400 | mov word ptr [ebp - 0xe], 0x54 // 66895df4 | mov word ptr [ebp - 0xc], bx // 66895df6 | mov word ptr [ebp - 0xa], bx // 53 | push ebx $sequence_5 = { 50 ff15???????? 6a3f 33c0 59 } // n = 5, score = 900 // 50 | push eax // ff15???????? | // 6a3f | push 0x3f // 33c0 | xor eax, eax // 59 | pop ecx $sequence_6 = { ff7508 ff15???????? 56 53 ff15???????? 50 } // n = 6, score = 900 // ff7508 | push dword ptr [ebp + 8] // ff15???????? | // 56 | push esi // 53 | push ebx // ff15???????? | // 50 | push eax $sequence_7 = { 53 51 ffd0 8bf8 57 ff15???????? } // n = 6, score = 900 // 53 | push ebx // 51 | push ecx // ffd0 | call eax // 8bf8 | mov edi, eax // 57 | push edi // ff15???????? | $sequence_8 = { 81c900ffffff 41 85c9 7e1c 55 8bc7 33d2 } // n = 7, score = 600 // 81c900ffffff | or ecx, 0xffffff00 // 41 | inc ecx // 85c9 | test ecx, ecx // 7e1c | jle 0x1e // 55 | push ebp // 8bc7 | mov eax, edi // 33d2 | xor edx, edx $sequence_9 = { 8d54240c 52 ff15???????? 8d842420010000 50 6804010000 ff15???????? } // n = 7, score = 600 // 8d54240c | lea edx, [esp + 0xc] // 52 | push edx // ff15???????? | // 8d842420010000 | lea eax, [esp + 0x120] // 50 | push eax // 6804010000 | push 0x104 // ff15???????? | $sequence_10 = { 0f87f1000000 8d5701 52 e8???????? 83c404 } // n = 5, score = 600 // 0f87f1000000 | ja 0xf7 // 8d5701 | lea edx, [edi + 1] // 52 | push edx // e8???????? | // 83c404 | add esp, 4 $sequence_11 = { 8a44341c 32c2 8844341c 46 3bf1 } // n = 5, score = 600 // 8a44341c | mov al, byte ptr [esp + esi + 0x1c] // 32c2 | xor al, dl // 8844341c | mov byte ptr [esp + esi + 0x1c], al // 46 | inc esi // 3bf1 | cmp esi, ecx $sequence_12 = { 85d2 8945fc 741c 8b4508 56 } // n = 5, score = 600 // 85d2 | test edx, edx // 8945fc | mov dword ptr [ebp - 4], eax // 741c | je 0x1e // 8b4508 | mov eax, dword ptr [ebp + 8] // 56 | push esi $sequence_13 = { 7cf1 ffd3 8b35???????? 2bc7 3de8030000 760f 8d44241c } // n = 7, score = 600 // 7cf1 | jl 0xfffffff3 // ffd3 | call ebx // 8b35???????? | // 2bc7 | sub eax, edi // 3de8030000 | cmp eax, 0x3e8 // 760f | jbe 0x11 // 8d44241c | lea eax, [esp + 0x1c] $sequence_14 = { 33c0 81c418020000 c21000 a1???????? 85c0 } // n = 5, score = 600 // 33c0 | xor eax, eax // 81c418020000 | add esp, 0x218 // c21000 | ret 0x10 // a1???????? | // 85c0 | test eax, eax $sequence_15 = { 6a00 6a00 ff15???????? 6a02 a3???????? 8b8c242c020000 } // n = 6, score = 600 // 6a00 | push 0 // 6a00 | push 0 // ff15???????? | // 6a02 | push 2 // a3???????? | // 8b8c242c020000 | mov ecx, dword ptr [esp + 0x22c] $sequence_16 = { 648b1530000000 8b520c 8b521c 8b5a08 } // n = 4, score = 200 // 648b1530000000 | mov edx, dword ptr fs:[0x30] // 8b520c | mov edx, dword ptr [edx + 0xc] // 8b521c | mov edx, dword ptr [edx + 0x1c] // 8b5a08 | mov ebx, dword ptr [edx + 8] $sequence_17 = { 85c0 0f84c9000000 89462c 8b461c 40 } // n = 5, score = 100 // 85c0 | test eax, eax // 0f84c9000000 | je 0xcf // 89462c | mov dword ptr [esi + 0x2c], eax // 8b461c | mov eax, dword ptr [esi + 0x1c] // 40 | inc eax $sequence_18 = { ff5648 0fb64de2 8b562c c7048a00000000 8b7df0 8b07 89467c } // n = 7, score = 100 // ff5648 | call dword ptr [esi + 0x48] // 0fb64de2 | movzx ecx, byte ptr [ebp - 0x1e] // 8b562c | mov edx, dword ptr [esi + 0x2c] // c7048a00000000 | mov dword ptr [edx + ecx*4], 0 // 8b7df0 | mov edi, dword ptr [ebp - 0x10] // 8b07 | mov eax, dword ptr [edi] // 89467c | mov dword ptr [esi + 0x7c], eax $sequence_19 = { 8aa568ffffff c9 c3 55 8bec b800010000 e8???????? } // n = 7, score = 100 // 8aa568ffffff | mov ah, byte ptr [ebp - 0x98] // c9 | leave // c3 | ret // 55 | push ebp // 8bec | mov ebp, esp // b800010000 | mov eax, 0x100 // e8???????? | $sequence_20 = { eb0d ff75f8 e8???????? 8b45f8 } // n = 4, score = 100 // eb0d | jmp 0xf // ff75f8 | push dword ptr [ebp - 8] // e8???????? | // 8b45f8 | mov eax, dword ptr [ebp - 8] $sequence_21 = { 85c0 763f 8d5308 33c9 } // n = 4, score = 100 // 85c0 | test eax, eax // 763f | jbe 0x41 // 8d5308 | lea edx, [ebx + 8] // 33c9 | xor ecx, ecx $sequence_22 = { e9???????? 83f900 0f8cddfeffff 83f91f 0f8fd4feffff 8b562c 8b148a } // n = 7, score = 100 // e9???????? | // 83f900 | cmp ecx, 0 // 0f8cddfeffff | jl 0xfffffee3 // 83f91f | cmp ecx, 0x1f // 0f8fd4feffff | jg 0xfffffeda // 8b562c | mov edx, dword ptr [esi + 0x2c] // 8b148a | mov edx, dword ptr [edx + ecx*4] $sequence_23 = { b900001800 3bc1 7c02 8bc1 50 } // n = 5, score = 100 // b900001800 | mov ecx, 0x180000 // 3bc1 | cmp eax, ecx // 7c02 | jl 4 // 8bc1 | mov eax, ecx // 50 | push eax condition: 7 of them and filesize < 8224768 }
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