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 = "2026-05-04" 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 = "20260422" malpedia_hash = "a182e35da64e6d71cb55f125c4d4225196523f14" malpedia_version = "20260504" 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 = { 56 50 e8???????? 59 59 5e c20400 } // n = 7, score = 900 // 56 | push esi // 50 | push eax // e8???????? | // 59 | pop ecx // 59 | pop ecx // 5e | pop esi // c20400 | ret 4 $sequence_1 = { 0f31 90 0145fc ff75fc ff15???????? } // n = 5, score = 900 // 0f31 | rdtsc // 90 | nop // 0145fc | add dword ptr [ebp - 4], eax // ff75fc | push dword ptr [ebp - 4] // ff15???????? | $sequence_2 = { 8d4514 53 50 56 53 6a05 } // n = 6, score = 900 // 8d4514 | lea eax, [ebp + 0x14] // 53 | push ebx // 50 | push eax // 56 | push esi // 53 | push ebx // 6a05 | push 5 $sequence_3 = { 40 50 6a01 ff15???????? 83c40c 85c0 } // n = 6, score = 900 // 40 | inc eax // 50 | push eax // 6a01 | push 1 // ff15???????? | // 83c40c | add esp, 0xc // 85c0 | test eax, eax $sequence_4 = { e8???????? 817d14e8030000 53 56 57 } // n = 5, score = 900 // e8???????? | // 817d14e8030000 | cmp dword ptr [ebp + 0x14], 0x3e8 // 53 | push ebx // 56 | push esi // 57 | push edi $sequence_5 = { c745fcf8ffffff 3bf7 750c 895dfc } // n = 4, score = 900 // c745fcf8ffffff | mov dword ptr [ebp - 4], 0xfffffff8 // 3bf7 | cmp esi, edi // 750c | jne 0xe // 895dfc | mov dword ptr [ebp - 4], ebx $sequence_6 = { 83c40c 85c0 7504 33c0 eb09 56 } // n = 6, score = 900 // 83c40c | add esp, 0xc // 85c0 | test eax, eax // 7504 | jne 6 // 33c0 | xor eax, eax // eb09 | jmp 0xb // 56 | push esi $sequence_7 = { 56 897d14 e8???????? 83c40c 8d4514 53 } // n = 6, score = 900 // 56 | push esi // 897d14 | mov dword ptr [ebp + 0x14], edi // e8???????? | // 83c40c | add esp, 0xc // 8d4514 | lea eax, [ebp + 0x14] // 53 | push ebx $sequence_8 = { 49 85d2 8945fc 741c 8b4508 } // n = 5, score = 600 // 49 | dec ecx // 85d2 | test edx, edx // 8945fc | mov dword ptr [ebp - 4], eax // 741c | je 0x1e // 8b4508 | mov eax, dword ptr [ebp + 8] $sequence_9 = { 3de8030000 760f 8d44241c 50 } // n = 4, score = 600 // 3de8030000 | cmp eax, 0x3e8 // 760f | jbe 0x11 // 8d44241c | lea eax, [esp + 0x1c] // 50 | push eax $sequence_10 = { 51 ff15???????? 33c0 81c418020000 } // n = 4, score = 600 // 51 | push ecx // ff15???????? | // 33c0 | xor eax, eax // 81c418020000 | add esp, 0x218 $sequence_11 = { 8bcf 81e1ff000080 7908 49 } // n = 4, score = 600 // 8bcf | mov ecx, edi // 81e1ff000080 | and ecx, 0x800000ff // 7908 | jns 0xa // 49 | dec ecx $sequence_12 = { 6a00 6a00 ff15???????? 6a02 a3???????? 8b8c242c020000 51 } // n = 7, score = 600 // 6a00 | push 0 // 6a00 | push 0 // ff15???????? | // 6a02 | push 2 // a3???????? | // 8b8c242c020000 | mov ecx, dword ptr [esp + 0x22c] // 51 | push ecx $sequence_13 = { 49 8975fc 75ec 8bc6 5e } // n = 5, score = 600 // 49 | dec ecx // 8975fc | mov dword ptr [ebp - 4], esi // 75ec | jne 0xffffffee // 8bc6 | mov eax, esi // 5e | pop esi $sequence_14 = { 8bd8 b941000000 33c0 8dbddcfeffff } // n = 4, score = 600 // 8bd8 | mov ebx, eax // b941000000 | mov ecx, 0x41 // 33c0 | xor eax, eax // 8dbddcfeffff | lea edi, [ebp - 0x124] $sequence_15 = { 6a01 50 ff15???????? 50 ff15???????? 33c0 } // n = 6, score = 600 // 6a01 | push 1 // 50 | push eax // ff15???????? | // 50 | push eax // ff15???????? | // 33c0 | xor eax, eax $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 = { 6a04 8d45fc 50 6805100000 68ffff0000 57 ff9698000000 } // n = 7, score = 100 // 6a04 | push 4 // 8d45fc | lea eax, [ebp - 4] // 50 | push eax // 6805100000 | push 0x1005 // 68ffff0000 | push 0xffff // 57 | push edi // ff9698000000 | call dword ptr [esi + 0x98] $sequence_18 = { ebc4 8345fc14 8b5dfc e9???????? 33c0 } // n = 5, score = 100 // ebc4 | jmp 0xffffffc6 // 8345fc14 | add dword ptr [ebp - 4], 0x14 // 8b5dfc | mov ebx, dword ptr [ebp - 4] // e9???????? | // 33c0 | xor eax, eax $sequence_19 = { b800010000 e8???????? 85c0 7477 50 8bf8 } // n = 6, score = 100 // b800010000 | mov eax, 0x100 // e8???????? | // 85c0 | test eax, eax // 7477 | je 0x79 // 50 | push eax // 8bf8 | mov edi, eax $sequence_20 = { 80cc02 8b4b10 85c9 751a f6c240 7408 8b4dfc } // n = 7, score = 100 // 80cc02 | or ah, 2 // 8b4b10 | mov ecx, dword ptr [ebx + 0x10] // 85c9 | test ecx, ecx // 751a | jne 0x1c // f6c240 | test dl, 0x40 // 7408 | je 0xa // 8b4dfc | mov ecx, dword ptr [ebp - 4] $sequence_21 = { 6a08 ff563c 50 ff5620 c3 50 6a00 } // n = 7, score = 100 // 6a08 | push 8 // ff563c | call dword ptr [esi + 0x3c] // 50 | push eax // ff5620 | call dword ptr [esi + 0x20] // c3 | ret // 50 | push eax // 6a00 | push 0 $sequence_22 = { 50 8bf8 668b4514 668907 } // n = 4, score = 100 // 50 | push eax // 8bf8 | mov edi, eax // 668b4514 | mov ax, word ptr [ebp + 0x14] // 668907 | mov word ptr [edi], ax $sequence_23 = { 85c0 0f84a7000000 03403c 85c0 0f849c000000 } // n = 5, score = 100 // 85c0 | test eax, eax // 0f84a7000000 | je 0xad // 03403c | add eax, dword ptr [eax + 0x3c] // 85c0 | test eax, eax // 0f849c000000 | je 0xa2 condition: 7 of them and filesize < 8224768 }
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