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 = "2020-10-14" version = "1" description = "autogenerated rule brought to you by yara-signator" tool = "yara-signator v0.5.0" tool_config = "callsandjumps;datarefs;binvalue" malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.plead" malpedia_rule_date = "20201014" malpedia_hash = "a7e3bd57eaf12bf3ea29a863c041091ba3af9ac9" malpedia_version = "20201014" 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 = { c745e401000000 c745fcffffffff e8???????? 33c0 8b4df0 64890d00000000 } // n = 6, score = 600 // c745e401000000 | mov dword ptr [ebp - 0x1c], 1 // c745fcffffffff | mov dword ptr [ebp - 4], 0xffffffff // e8???????? | // 33c0 | xor eax, eax // 8b4df0 | mov ecx, dword ptr [ebp - 0x10] // 64890d00000000 | mov dword ptr fs:[0], ecx $sequence_1 = { 53 56 897d14 e8???????? 83c40c 8d4514 53 } // n = 7, score = 600 // 53 | push ebx // 56 | push esi // 897d14 | mov dword ptr [ebp + 0x14], edi // e8???????? | // 83c40c | add esp, 0xc // 8d4514 | lea eax, [ebp + 0x14] // 53 | push ebx $sequence_2 = { 8844341c 46 3bf1 7cf1 ffd3 } // n = 5, score = 600 // 8844341c | mov byte ptr [esp + esi + 0x1c], al // 46 | inc esi // 3bf1 | cmp esi, ecx // 7cf1 | jl 0xfffffff3 // ffd3 | call ebx $sequence_3 = { 3bf7 740f ebda 33f6 c745fcf8ffffff 3bf7 } // n = 6, score = 600 // 3bf7 | cmp esi, edi // 740f | je 0x11 // ebda | jmp 0xffffffdc // 33f6 | xor esi, esi // c745fcf8ffffff | mov dword ptr [ebp - 4], 0xfffffff8 // 3bf7 | cmp esi, edi $sequence_4 = { 750f 56 ff15???????? 6afe } // n = 4, score = 600 // 750f | jne 0x11 // 56 | push esi // ff15???????? | // 6afe | push -2 $sequence_5 = { 85c0 750c c745fcfcffffff e9???????? 395d18 } // n = 5, score = 600 // 85c0 | test eax, eax // 750c | jne 0xe // c745fcfcffffff | mov dword ptr [ebp - 4], 0xfffffffc // e9???????? | // 395d18 | cmp dword ptr [ebp + 0x18], ebx $sequence_6 = { 53 50 8b1d???????? ffd3 85c0 743b } // n = 6, score = 600 // 53 | push ebx // 50 | push eax // 8b1d???????? | // ffd3 | call ebx // 85c0 | test eax, eax // 743b | je 0x3d $sequence_7 = { c9 c21000 56 8b742408 85f6 7417 56 } // n = 7, score = 600 // c9 | leave // c21000 | ret 0x10 // 56 | push esi // 8b742408 | mov esi, dword ptr [esp + 8] // 85f6 | test esi, esi // 7417 | je 0x19 // 56 | push esi $sequence_8 = { 6a01 ff15???????? 83c40c 85c0 7504 33c0 } // n = 6, score = 600 // 6a01 | push 1 // ff15???????? | // 83c40c | add esp, 0xc // 85c0 | test eax, eax // 7504 | jne 6 // 33c0 | xor eax, eax $sequence_9 = { 85c0 7504 33c0 eb09 56 50 e8???????? } // n = 7, score = 600 // 85c0 | test eax, eax // 7504 | jne 6 // 33c0 | xor eax, eax // eb09 | jmp 0xb // 56 | push esi // 50 | push eax // e8???????? | $sequence_10 = { 760f 8d44241c 50 ffd6 6a0b ff15???????? 6a00 } // n = 7, score = 600 // 760f | jbe 0x11 // 8d44241c | lea eax, [esp + 0x1c] // 50 | push eax // ffd6 | call esi // 6a0b | push 0xb // ff15???????? | // 6a00 | push 0 $sequence_11 = { 8b8c242c020000 51 ff15???????? 8d54240c 52 } // n = 5, score = 600 // 8b8c242c020000 | mov ecx, dword ptr [esp + 0x22c] // 51 | push ecx // ff15???????? | // 8d54240c | lea edx, [esp + 0xc] // 52 | push edx $sequence_12 = { ff15???????? 8b4c2412 8b54240e 8b44240c 81e1ffff0000 } // n = 5, score = 600 // ff15???????? | // 8b4c2412 | mov ecx, dword ptr [esp + 0x12] // 8b54240e | mov edx, dword ptr [esp + 0xe] // 8b44240c | mov eax, dword ptr [esp + 0xc] // 81e1ffff0000 | and ecx, 0xffff $sequence_13 = { 33c0 8dbdd8feffff f3ab 6804010000 8d95d8feffff } // n = 5, score = 600 // 33c0 | xor eax, eax // 8dbdd8feffff | lea edi, [ebp - 0x128] // f3ab | rep stosd dword ptr es:[edi], eax // 6804010000 | push 0x104 // 8d95d8feffff | lea edx, [ebp - 0x128] $sequence_14 = { 25ffff0000 50 8b8db2fcffff 81e1ffff0000 } // n = 4, score = 600 // 25ffff0000 | and eax, 0xffff // 50 | push eax // 8b8db2fcffff | mov ecx, dword ptr [ebp - 0x34e] // 81e1ffff0000 | and ecx, 0xffff $sequence_15 = { 66c745f25400 66895df4 66895df6 53 } // n = 4, score = 600 // 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_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 = { 8b733c 8b741e78 03f3 56 8b7620 } // n = 5, score = 200 // 8b733c | mov esi, dword ptr [ebx + 0x3c] // 8b741e78 | mov esi, dword ptr [esi + ebx + 0x78] // 03f3 | add esi, ebx // 56 | push esi // 8b7620 | mov esi, dword ptr [esi + 0x20] $sequence_18 = { 75f2 ab c3 56 } // n = 4, score = 100 // 75f2 | jne 0xfffffff4 // ab | stosd dword ptr es:[edi], eax // c3 | ret // 56 | push esi $sequence_19 = { 85c0 7477 50 8bf8 8b4d0c } // n = 5, score = 100 // 85c0 | test eax, eax // 7477 | je 0x79 // 50 | push eax // 8bf8 | mov edi, eax // 8b4d0c | mov ecx, dword ptr [ebp + 0xc] $sequence_20 = { 85c0 7412 03c3 85c0 740c 8d4b08 51 } // n = 7, score = 100 // 85c0 | test eax, eax // 7412 | je 0x14 // 03c3 | add eax, ebx // 85c0 | test eax, eax // 740c | je 0xe // 8d4b08 | lea ecx, [ebx + 8] // 51 | push ecx $sequence_21 = { ff5644 8b4508 8b483c 034f54 8b7df8 } // n = 5, score = 100 // ff5644 | call dword ptr [esi + 0x44] // 8b4508 | mov eax, dword ptr [ebp + 8] // 8b483c | mov ecx, dword ptr [eax + 0x3c] // 034f54 | add ecx, dword ptr [edi + 0x54] // 8b7df8 | mov edi, dword ptr [ebp - 8] $sequence_22 = { eb0d ff75f8 e8???????? 8b45f8 eb02 33c0 } // n = 6, score = 100 // eb0d | jmp 0xf // ff75f8 | push dword ptr [ebp - 8] // e8???????? | // 8b45f8 | mov eax, dword ptr [ebp - 8] // eb02 | jmp 4 // 33c0 | xor eax, eax $sequence_23 = { 68f0000000 57 50 ff5650 } // n = 4, score = 100 // 68f0000000 | push 0xf0 // 57 | push edi // 50 | push eax // ff5650 | call dword ptr [esi + 0x50] condition: 7 of them and filesize < 860160 }
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