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 = "2021-10-07" 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 = "20211007" malpedia_hash = "e5b790e0f888f252d49063a1251ca60ec2832535" malpedia_version = "20211008" 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 = { 881c30 ff15???????? 3bc3 59 } // n = 4, score = 900 // 881c30 | mov byte ptr [eax + esi], bl // ff15???????? | // 3bc3 | cmp eax, ebx // 59 | pop ecx $sequence_1 = { c21000 56 8b742408 85f6 7417 } // n = 5, score = 900 // c21000 | ret 0x10 // 56 | push esi // 8b742408 | mov esi, dword ptr [esp + 8] // 85f6 | test esi, esi // 7417 | je 0x19 $sequence_2 = { 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_3 = { 750f 56 ff15???????? 6afe 58 e9???????? } // n = 6, score = 900 // 750f | jne 0x11 // 56 | push esi // ff15???????? | // 6afe | push -2 // 58 | pop eax // e9???????? | $sequence_4 = { 53 50 56 53 6a13 } // n = 5, score = 900 // 53 | push ebx // 50 | push eax // 56 | push esi // 53 | push ebx // 6a13 | push 0x13 $sequence_5 = { 7504 33c0 eb09 56 50 e8???????? 59 } // n = 7, score = 900 // 7504 | jne 6 // 33c0 | xor eax, eax // eb09 | jmp 0xb // 56 | push esi // 50 | push eax // e8???????? | // 59 | pop ecx $sequence_6 = { 50 ff15???????? 6a7f 33c0 59 } // n = 5, score = 900 // 50 | push eax // ff15???????? | // 6a7f | push 0x7f // 33c0 | xor eax, eax // 59 | pop ecx $sequence_7 = { e8???????? 83c40c 8d4514 53 } // n = 4, score = 900 // e8???????? | // 83c40c | add esp, 0xc // 8d4514 | lea eax, dword ptr [ebp + 0x14] // 53 | push ebx $sequence_8 = { c705????????01000000 ff15???????? 8b1d???????? ffd3 8bf8 33f6 8bcf } // n = 7, score = 600 // c705????????01000000 | // ff15???????? | // 8b1d???????? | // ffd3 | call ebx // 8bf8 | mov edi, eax // 33f6 | xor esi, esi // 8bcf | mov ecx, edi $sequence_9 = { 33c0 81c418020000 c21000 8b8c241c020000 68???????? } // n = 5, score = 600 // 33c0 | xor eax, eax // 81c418020000 | add esp, 0x218 // c21000 | ret 0x10 // 8b8c241c020000 | mov ecx, dword ptr [esp + 0x21c] // 68???????? | $sequence_10 = { 81ff00002000 0f87f1000000 8d5701 52 } // n = 4, score = 600 // 81ff00002000 | cmp edi, 0x200000 // 0f87f1000000 | ja 0xf7 // 8d5701 | lea edx, dword ptr [edi + 1] // 52 | push edx $sequence_11 = { b941000000 33c0 8d7c241c 6804010000 52 50 } // n = 6, score = 600 // b941000000 | mov ecx, 0x41 // 33c0 | xor eax, eax // 8d7c241c | lea edi, dword ptr [esp + 0x1c] // 6804010000 | push 0x104 // 52 | push edx // 50 | push eax $sequence_12 = { 2bc7 3de8030000 760f 8d44241c 50 ffd6 } // n = 6, score = 600 // 2bc7 | sub eax, edi // 3de8030000 | cmp eax, 0x3e8 // 760f | jbe 0x11 // 8d44241c | lea eax, dword ptr [esp + 0x1c] // 50 | push eax // ffd6 | call esi $sequence_13 = { 85c0 0f8464010000 85db 0f845c010000 8bcf } // n = 5, score = 600 // 85c0 | test eax, eax // 0f8464010000 | je 0x16a // 85db | test ebx, ebx // 0f845c010000 | je 0x162 // 8bcf | mov ecx, edi $sequence_14 = { 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_15 = { 7516 83c8ff 8b4df0 64890d00000000 5f 5e 5b } // n = 7, score = 600 // 7516 | jne 0x18 // 83c8ff | or eax, 0xffffffff // 8b4df0 | mov ecx, dword ptr [ebp - 0x10] // 64890d00000000 | mov dword ptr fs:[0], ecx // 5f | pop edi // 5e | pop esi // 5b | pop 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 = { 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 = { 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_19 = { 03403c 85c0 7419 8b4028 85c0 7412 03c3 } // n = 7, score = 100 // 03403c | add eax, dword ptr [eax + 0x3c] // 85c0 | test eax, eax // 7419 | je 0x1b // 8b4028 | mov eax, dword ptr [eax + 0x28] // 85c0 | test eax, eax // 7412 | je 0x14 // 03c3 | add eax, ebx $sequence_20 = { 57 50 ff5650 8d45f0 50 8d45ac } // n = 6, score = 100 // 57 | push edi // 50 | push eax // ff5650 | call dword ptr [esi + 0x50] // 8d45f0 | lea eax, dword ptr [ebp - 0x10] // 50 | push eax // 8d45ac | lea eax, dword ptr [ebp - 0x54] $sequence_21 = { 85c9 7272 ba00010000 3bca 7e02 8bca 894d0c } // n = 7, score = 100 // 85c9 | test ecx, ecx // 7272 | jb 0x74 // ba00010000 | mov edx, 0x100 // 3bca | cmp ecx, edx // 7e02 | jle 4 // 8bca | mov ecx, edx // 894d0c | mov dword ptr [ebp + 0xc], ecx $sequence_22 = { 7409 50 ff75f8 e8???????? ff75f8 e8???????? 85c0 } // n = 7, score = 100 // 7409 | je 0xb // 50 | push eax // ff75f8 | push dword ptr [ebp - 8] // e8???????? | // ff75f8 | push dword ptr [ebp - 8] // e8???????? | // 85c0 | test eax, eax $sequence_23 = { f6c280 7417 8b4dfc 8b4924 } // n = 4, score = 100 // f6c280 | test dl, 0x80 // 7417 | je 0x19 // 8b4dfc | mov ecx, dword ptr [ebp - 4] // 8b4924 | mov ecx, dword ptr [ecx + 0x24] condition: 7 of them and filesize < 8224768 }
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