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 = "2020-12-22" version = "1" description = "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 = "20201222" malpedia_hash = "30354d830a29f0fbd3714d93d94dea941d77a130" malpedia_version = "20201023" 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 59 5e c20400 8b4c2404 56 } // n = 6, score = 900 // 59 | pop ecx // 59 | pop ecx // 5e | pop esi // c20400 | ret 4 // 8b4c2404 | mov ecx, dword ptr [esp + 4] // 56 | push esi $sequence_1 = { 8b4514 56 881c30 ff15???????? 3dc8000000 } // n = 5, score = 900 // 8b4514 | mov eax, dword ptr [ebp + 0x14] // 56 | push esi // 881c30 | mov byte ptr [eax + esi], bl // ff15???????? | // 3dc8000000 | cmp eax, 0xc8 $sequence_2 = { 53 56 897d14 e8???????? 83c40c 8d4514 53 } // n = 7, score = 900 // 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_3 = { ebda 33f6 c745fcf8ffffff 3bf7 750c 895dfc eb07 } // n = 7, 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 // eb07 | jmp 9 $sequence_4 = { 83c40c 8d4514 53 50 56 53 } // n = 6, score = 900 // 83c40c | add esp, 0xc // 8d4514 | lea eax, [ebp + 0x14] // 53 | push ebx // 50 | push eax // 56 | push esi // 53 | push ebx $sequence_5 = { e8???????? 40 50 6a01 ff15???????? 83c40c } // n = 6, score = 900 // e8???????? | // 40 | inc eax // 50 | push eax // 6a01 | push 1 // ff15???????? | // 83c40c | add esp, 0xc $sequence_6 = { 750c c745fcfcffffff e9???????? 395d18 } // n = 4, score = 900 // 750c | jne 0xe // c745fcfcffffff | mov dword ptr [ebp - 4], 0xfffffffc // e9???????? | // 395d18 | cmp dword ptr [ebp + 0x18], ebx $sequence_7 = { 897518 bf00800000 57 53 56 } // n = 5, score = 900 // 897518 | mov dword ptr [ebp + 0x18], esi // bf00800000 | mov edi, 0x8000 // 57 | push edi // 53 | push ebx // 56 | push esi $sequence_8 = { 85c0 0f8464010000 85db 0f845c010000 8bcf 33c0 8bfb } // n = 7, score = 600 // 85c0 | test eax, eax // 0f8464010000 | je 0x16a // 85db | test ebx, ebx // 0f845c010000 | je 0x162 // 8bcf | mov ecx, edi // 33c0 | xor eax, eax // 8bfb | mov edi, ebx $sequence_9 = { ffd6 6a0b ff15???????? 6a00 6a00 6a00 68???????? } // n = 7, score = 600 // ffd6 | call esi // 6a0b | push 0xb // ff15???????? | // 6a00 | push 0 // 6a00 | push 0 // 6a00 | push 0 // 68???????? | $sequence_10 = { 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_11 = { c705????????00000000 ff15???????? 33c0 81c418020000 c21000 8b8c241c020000 68???????? } // n = 7, score = 600 // c705????????00000000 | // ff15???????? | // 33c0 | xor eax, eax // 81c418020000 | add esp, 0x218 // c21000 | ret 0x10 // 8b8c241c020000 | mov ecx, dword ptr [esp + 0x21c] // 68???????? | $sequence_12 = { 25ffff0000 52 50 8d8c242c010000 68???????? } // n = 5, score = 600 // 25ffff0000 | and eax, 0xffff // 52 | push edx // 50 | push eax // 8d8c242c010000 | lea ecx, [esp + 0x12c] // 68???????? | $sequence_13 = { 50 f3ab c705????????01000000 ff15???????? } // n = 4, score = 600 // 50 | push eax // f3ab | rep stosd dword ptr es:[edi], eax // c705????????01000000 | // ff15???????? | $sequence_14 = { 81c900ffffff 41 85c9 7e1c } // n = 4, score = 600 // 81c900ffffff | or ecx, 0xffffff00 // 41 | inc ecx // 85c9 | test ecx, ecx // 7e1c | jle 0x1e $sequence_15 = { 8be5 5d c21000 6880000000 8d85d8feffff } // n = 5, score = 600 // 8be5 | mov esp, ebp // 5d | pop ebp // c21000 | ret 0x10 // 6880000000 | push 0x80 // 8d85d8feffff | lea eax, [ebp - 0x128] $sequence_16 = { 8b733c 8b741e78 03f3 56 } // n = 4, score = 200 // 8b733c | mov esi, dword ptr [ebx + 0x3c] // 8b741e78 | mov esi, dword ptr [esi + ebx + 0x78] // 03f3 | add esi, ebx // 56 | push esi $sequence_17 = { 03f3 56 8b7620 03f3 } // n = 4, score = 200 // 03f3 | add esi, ebx // 56 | push esi // 8b7620 | mov esi, dword ptr [esi + 0x20] // 03f3 | add esi, ebx $sequence_18 = { 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_19 = { 741c 7f16 ff9688000000 3d4c270000 7412 3d14270000 74ca } // n = 7, score = 100 // 741c | je 0x1e // 7f16 | jg 0x18 // ff9688000000 | call dword ptr [esi + 0x88] // 3d4c270000 | cmp eax, 0x274c // 7412 | je 0x14 // 3d14270000 | cmp eax, 0x2714 // 74ca | je 0xffffffcc $sequence_20 = { f77d0c 8ac2 41 81f900010000 72e0 8b7d10 } // n = 6, score = 100 // f77d0c | idiv dword ptr [ebp + 0xc] // 8ac2 | mov al, dl // 41 | inc ecx // 81f900010000 | cmp ecx, 0x100 // 72e0 | jb 0xffffffe2 // 8b7d10 | mov edi, dword ptr [ebp + 0x10] $sequence_21 = { 88140f 41 3b4d14 72e0 b001 } // n = 5, score = 100 // 88140f | mov byte ptr [edi + ecx], dl // 41 | inc ecx // 3b4d14 | cmp ecx, dword ptr [ebp + 0x14] // 72e0 | jb 0xffffffe2 // b001 | mov al, 1 $sequence_22 = { e2fc e8???????? e8???????? b800040000 e8???????? } // n = 5, score = 100 // e2fc | loop 0xfffffffe // e8???????? | // e8???????? | // b800040000 | mov eax, 0x400 // e8???????? | $sequence_23 = { 50 51 8b5308 52 } // n = 4, score = 100 // 50 | push eax // 51 | push ecx // 8b5308 | mov edx, dword ptr [ebx + 8] // 52 | push edx condition: 7 of them and filesize < 8224768 }
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