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 = "2024-10-31" 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 = "20241030" malpedia_hash = "26e26953c49c8efafbf72a38076855d578e0a2e4" malpedia_version = "20241030" 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 = { 50 6a01 ff15???????? 83c40c 85c0 7504 33c0 } // n = 7, score = 900 // 50 | push eax // 6a01 | push 1 // ff15???????? | // 83c40c | add esp, 0xc // 85c0 | test eax, eax // 7504 | jne 6 // 33c0 | xor eax, eax $sequence_1 = { 83c40c 8d4514 53 50 56 } // n = 5, score = 900 // 83c40c | add esp, 0xc // 8d4514 | lea eax, [ebp + 0x14] // 53 | push ebx // 50 | push eax // 56 | push esi $sequence_2 = { ff15???????? 85c0 750c c745fcfbffffff } // n = 4, score = 900 // ff15???????? | // 85c0 | test eax, eax // 750c | jne 0xe // c745fcfbffffff | mov dword ptr [ebp - 4], 0xfffffffb $sequence_3 = { 85c0 7504 33c0 eb09 56 50 } // n = 6, score = 900 // 85c0 | test eax, eax // 7504 | jne 6 // 33c0 | xor eax, eax // eb09 | jmp 0xb // 56 | push esi // 50 | push eax $sequence_4 = { ebda 33f6 c745fcf8ffffff 3bf7 750c 895dfc } // n = 6, score = 900 // ebda | jmp 0xffffffdc // 33f6 | xor esi, esi // c745fcf8ffffff | mov dword ptr [ebp - 4], 0xfffffff8 // 3bf7 | cmp esi, edi // 750c | jne 0xe // 895dfc | mov dword ptr [ebp - 4], ebx $sequence_5 = { 59 894510 0f878f000000 3bc3 0f8482000000 } // n = 5, score = 900 // 59 | pop ecx // 894510 | mov dword ptr [ebp + 0x10], eax // 0f878f000000 | ja 0x95 // 3bc3 | cmp eax, ebx // 0f8482000000 | je 0x88 $sequence_6 = { 85c0 750f 56 ff15???????? 6afe 58 e9???????? } // n = 7, score = 900 // 85c0 | test eax, eax // 750f | jne 0x11 // 56 | push esi // ff15???????? | // 6afe | push -2 // 58 | pop eax // e9???????? | $sequence_7 = { e8???????? 817d14e8030000 53 56 } // n = 4, score = 900 // e8???????? | // 817d14e8030000 | cmp dword ptr [ebp + 0x14], 0x3e8 // 53 | push ebx // 56 | push esi $sequence_8 = { 81ec1c020000 53 56 57 8965f0 ff15???????? 8bd8 } // n = 7, score = 600 // 81ec1c020000 | sub esp, 0x21c // 53 | push ebx // 56 | push esi // 57 | push edi // 8965f0 | mov dword ptr [ebp - 0x10], esp // ff15???????? | // 8bd8 | mov ebx, eax $sequence_9 = { 8a10 03f2 40 49 8975fc 75ec 8bc6 } // n = 7, score = 600 // 8a10 | mov dl, byte ptr [eax] // 03f2 | add esi, edx // 40 | inc eax // 49 | dec ecx // 8975fc | mov dword ptr [ebp - 4], esi // 75ec | jne 0xffffffee // 8bc6 | mov eax, esi $sequence_10 = { 50 f3ab c705????????01000000 ff15???????? 8b1d???????? ffd3 8bf8 } // n = 7, score = 600 // 50 | push eax // f3ab | rep stosd dword ptr es:[edi], eax // c705????????01000000 | // ff15???????? | // 8b1d???????? | // ffd3 | call ebx // 8bf8 | mov edi, eax $sequence_11 = { 8b942428020000 8b842424020000 52 50 51 8b8c2428020000 } // n = 6, score = 600 // 8b942428020000 | mov edx, dword ptr [esp + 0x228] // 8b842424020000 | mov eax, dword ptr [esp + 0x224] // 52 | push edx // 50 | push eax // 51 | push ecx // 8b8c2428020000 | mov ecx, dword ptr [esp + 0x228] $sequence_12 = { 5d 8a44341c 32c2 8844341c 46 3bf1 } // n = 6, score = 600 // 5d | pop ebp // 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_13 = { 52 ff15???????? 6aff a1???????? } // n = 4, score = 600 // 52 | push edx // ff15???????? | // 6aff | push -1 // a1???????? | $sequence_14 = { 8b8c241c020000 68???????? 51 ff15???????? 33c0 81c418020000 c21000 } // n = 7, score = 600 // 8b8c241c020000 | mov ecx, dword ptr [esp + 0x21c] // 68???????? | // 51 | push ecx // ff15???????? | // 33c0 | xor eax, eax // 81c418020000 | add esp, 0x218 // c21000 | ret 0x10 $sequence_15 = { 8d7c241c 6804010000 52 50 } // n = 4, score = 600 // 8d7c241c | lea edi, [esp + 0x1c] // 6804010000 | push 0x104 // 52 | push edx // 50 | push 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 = { 833f00 7420 85db 7505 bb50000000 } // n = 5, score = 100 // 833f00 | cmp dword ptr [edi], 0 // 7420 | je 0x22 // 85db | test ebx, ebx // 7505 | jne 7 // bb50000000 | mov ebx, 0x50 $sequence_18 = { 6a04 6800200000 ff7750 50 ff5644 } // n = 5, score = 100 // 6a04 | push 4 // 6800200000 | push 0x2000 // ff7750 | push dword ptr [edi + 0x50] // 50 | push eax // ff5644 | call dword ptr [esi + 0x44] $sequence_19 = { 51 035b3c 894334 e8???????? 8b45f8 } // n = 5, score = 100 // 51 | push ecx // 035b3c | add ebx, dword ptr [ebx + 0x3c] // 894334 | mov dword ptr [ebx + 0x34], eax // e8???????? | // 8b45f8 | mov eax, dword ptr [ebp - 8] $sequence_20 = { 89048a 8945ec 8b567c 895004 c7467c00000000 } // n = 5, score = 100 // 89048a | mov dword ptr [edx + ecx*4], eax // 8945ec | mov dword ptr [ebp - 0x14], eax // 8b567c | mov edx, dword ptr [esi + 0x7c] // 895004 | mov dword ptr [eax + 4], edx // c7467c00000000 | mov dword ptr [esi + 0x7c], 0 $sequence_21 = { e8???????? b02c aa 8b4510 85c0 } // n = 5, score = 100 // e8???????? | // b02c | mov al, 0x2c // aa | stosb byte ptr es:[edi], al // 8b4510 | mov eax, dword ptr [ebp + 0x10] // 85c0 | test eax, eax $sequence_22 = { 85c0 0f849f020000 8945f0 6a0c 8d4de0 } // n = 5, score = 100 // 85c0 | test eax, eax // 0f849f020000 | je 0x2a5 // 8945f0 | mov dword ptr [ebp - 0x10], eax // 6a0c | push 0xc // 8d4de0 | lea ecx, [ebp - 0x20] $sequence_23 = { 6a00 ff75f8 ff5648 eb0d } // n = 4, score = 100 // 6a00 | push 0 // ff75f8 | push dword ptr [ebp - 8] // ff5648 | call dword ptr [esi + 0x48] // eb0d | jmp 0xf condition: 7 of them and filesize < 8224768 }
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