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 = "2022-08-05" 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 = "20220805" malpedia_hash = "6ec06c64bcfdbeda64eff021c766b4ce34542b71" malpedia_version = "20220808" 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 = { e8???????? 83c40c 8d4514 53 } // n = 4, score = 900 // e8???????? | // 83c40c | add esp, 0xc // 8d4514 | lea eax, [ebp + 0x14] // 53 | push ebx $sequence_1 = { 85c0 750f 56 ff15???????? 6afe 58 } // n = 6, score = 900 // 85c0 | test eax, eax // 750f | jne 0x11 // 56 | push esi // ff15???????? | // 6afe | push -2 // 58 | pop eax $sequence_2 = { 750c c745fcfdffffff e9???????? 53 } // n = 4, score = 900 // 750c | jne 0xe // c745fcfdffffff | mov dword ptr [ebp - 4], 0xfffffffd // e9???????? | // 53 | push ebx $sequence_3 = { 740f ebda 33f6 c745fcf8ffffff 3bf7 750c } // n = 6, score = 900 // 740f | je 0x11 // ebda | jmp 0xffffffdc // 33f6 | xor esi, esi // c745fcf8ffffff | mov dword ptr [ebp - 4], 0xfffffff8 // 3bf7 | cmp esi, edi // 750c | jne 0xe $sequence_4 = { bf00020100 57 6a08 ff15???????? 50 } // n = 5, score = 900 // bf00020100 | mov edi, 0x10200 // 57 | push edi // 6a08 | push 8 // ff15???????? | // 50 | push eax $sequence_5 = { 50 56 ff15???????? 85c0 750f 56 } // n = 6, score = 900 // 50 | push eax // 56 | push esi // ff15???????? | // 85c0 | test eax, eax // 750f | jne 0x11 // 56 | push esi $sequence_6 = { 53 6a13 ff7508 ff15???????? 85c0 } // n = 5, score = 900 // 53 | push ebx // 6a13 | push 0x13 // ff7508 | push dword ptr [ebp + 8] // ff15???????? | // 85c0 | test eax, eax $sequence_7 = { ff15???????? 3dc8000000 59 754c } // n = 4, score = 900 // ff15???????? | // 3dc8000000 | cmp eax, 0xc8 // 59 | pop ecx // 754c | jne 0x4e $sequence_8 = { 25ffff0000 50 8b8daefcffff 81e1ffff0000 51 } // n = 5, score = 600 // 25ffff0000 | and eax, 0xffff // 50 | push eax // 8b8daefcffff | mov ecx, dword ptr [ebp - 0x352] // 81e1ffff0000 | and ecx, 0xffff // 51 | push ecx $sequence_9 = { ffd6 6a0b ff15???????? 6a00 6a00 } // n = 5, score = 600 // ffd6 | call esi // 6a0b | push 0xb // ff15???????? | // 6a00 | push 0 // 6a00 | push 0 $sequence_10 = { 6801020000 6a01 50 ff15???????? 50 ff15???????? } // n = 6, score = 600 // 6801020000 | push 0x201 // 6a01 | push 1 // 50 | push eax // ff15???????? | // 50 | push eax // ff15???????? | $sequence_11 = { 6a00 ff15???????? 6a02 a3???????? 8b8c242c020000 51 ff15???????? } // n = 7, score = 600 // 6a00 | push 0 // ff15???????? | // 6a02 | push 2 // a3???????? | // 8b8c242c020000 | mov ecx, dword ptr [esp + 0x22c] // 51 | push ecx // ff15???????? | $sequence_12 = { 8b1d???????? ffd3 8bf8 33f6 8bcf 81e1ff000080 7908 } // n = 7, score = 600 // 8b1d???????? | // ffd3 | call ebx // 8bf8 | mov edi, eax // 33f6 | xor esi, esi // 8bcf | mov ecx, edi // 81e1ff000080 | and ecx, 0x800000ff // 7908 | jns 0xa $sequence_13 = { 81ff00002000 0f87f1000000 8d5701 52 } // n = 4, score = 600 // 81ff00002000 | cmp edi, 0x200000 // 0f87f1000000 | ja 0xf7 // 8d5701 | lea edx, [edi + 1] // 52 | push edx $sequence_14 = { 52 50 51 8b8c2428020000 51 ff15???????? } // n = 6, score = 600 // 52 | push edx // 50 | push eax // 51 | push ecx // 8b8c2428020000 | mov ecx, dword ptr [esp + 0x228] // 51 | push ecx // ff15???????? | $sequence_15 = { 8b84241c020000 6880000000 6a00 6a00 6a00 } // n = 5, score = 600 // 8b84241c020000 | mov eax, dword ptr [esp + 0x21c] // 6880000000 | push 0x80 // 6a00 | push 0 // 6a00 | push 0 // 6a00 | push 0 $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 = { 85db 7505 bb50000000 8d4580 50 53 } // n = 6, score = 100 // 85db | test ebx, ebx // 7505 | jne 7 // bb50000000 | mov ebx, 0x50 // 8d4580 | lea eax, [ebp - 0x80] // 50 | push eax // 53 | push ebx $sequence_18 = { b900001800 3bc1 7c02 8bc1 50 ff5668 e9???????? } // n = 7, score = 100 // b900001800 | mov ecx, 0x180000 // 3bc1 | cmp eax, ecx // 7c02 | jl 4 // 8bc1 | mov eax, ecx // 50 | push eax // ff5668 | call dword ptr [esi + 0x68] // e9???????? | $sequence_19 = { 57 ff96a8000000 33c0 eb47 6a04 8d45fc } // n = 6, score = 100 // 57 | push edi // ff96a8000000 | call dword ptr [esi + 0xa8] // 33c0 | xor eax, eax // eb47 | jmp 0x49 // 6a04 | push 4 // 8d45fc | lea eax, [ebp - 4] $sequence_20 = { 33c9 021c07 021c0e 8a140e } // n = 4, score = 100 // 33c9 | xor ecx, ecx // 021c07 | add bl, byte ptr [edi + eax] // 021c0e | add bl, byte ptr [esi + ecx] // 8a140e | mov dl, byte ptr [esi + ecx] $sequence_21 = { 8b7c242c 8b742428 ff7608 8f87b8000000 ff760c 8f87a0000000 } // n = 6, score = 100 // 8b7c242c | mov edi, dword ptr [esp + 0x2c] // 8b742428 | mov esi, dword ptr [esp + 0x28] // ff7608 | push dword ptr [esi + 8] // 8f87b8000000 | pop dword ptr [edi + 0xb8] // ff760c | push dword ptr [esi + 0xc] // 8f87a0000000 | pop dword ptr [edi + 0xa0] $sequence_22 = { 6a10 50 57 ff9694000000 } // n = 4, score = 100 // 6a10 | push 0x10 // 50 | push eax // 57 | push edi // ff9694000000 | call dword ptr [esi + 0x94] $sequence_23 = { 8d7d88 e8???????? b02c aa 8b4510 } // n = 5, score = 100 // 8d7d88 | lea edi, [ebp - 0x78] // e8???????? | // b02c | mov al, 0x2c // aa | stosb byte ptr es:[edi], al // 8b4510 | mov eax, dword ptr [ebp + 0x10] condition: 7 of them and filesize < 8224768 }
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