Actor(s): Magic Hound, Rocket Kitten
There is no description at this point.
rule win_mpkbot_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-03-28" version = "1" description = "Detects win.mpkbot." 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.mpkbot" malpedia_rule_date = "20230328" malpedia_hash = "9d2d75cef573c1c2d861f5197df8f563b05a305d" malpedia_version = "20230407" 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 = { 38450c 740a eb05 38450c 7503 } // n = 5, score = 400 // 38450c | cmp byte ptr [ebp + 0xc], al // 740a | je 0xc // eb05 | jmp 7 // 38450c | cmp byte ptr [ebp + 0xc], al // 7503 | jne 5 $sequence_1 = { 8b45f8 8d55ec 52 8d55fc 52 6a01 6aff } // n = 7, score = 400 // 8b45f8 | mov eax, dword ptr [ebp - 8] // 8d55ec | lea edx, [ebp - 0x14] // 52 | push edx // 8d55fc | lea edx, [ebp - 4] // 52 | push edx // 6a01 | push 1 // 6aff | push -1 $sequence_2 = { a3???????? 8d45fc 50 683f000f00 6a00 } // n = 5, score = 400 // a3???????? | // 8d45fc | lea eax, [ebp - 4] // 50 | push eax // 683f000f00 | push 0xf003f // 6a00 | push 0 $sequence_3 = { 85c0 7fdf 5e 5b c9 c3 } // n = 6, score = 400 // 85c0 | test eax, eax // 7fdf | jg 0xffffffe1 // 5e | pop esi // 5b | pop ebx // c9 | leave // c3 | ret $sequence_4 = { 50 ff15???????? a3???????? ffe0 55 8bec 68???????? } // n = 7, score = 400 // 50 | push eax // ff15???????? | // a3???????? | // ffe0 | jmp eax // 55 | push ebp // 8bec | mov ebp, esp // 68???????? | $sequence_5 = { 6a01 ff15???????? ebcc 55 8bec } // n = 5, score = 400 // 6a01 | push 1 // ff15???????? | // ebcc | jmp 0xffffffce // 55 | push ebp // 8bec | mov ebp, esp $sequence_6 = { 56 57 6a00 ff15???????? 8bf0 0fb7450c } // n = 6, score = 400 // 56 | push esi // 57 | push edi // 6a00 | push 0 // ff15???????? | // 8bf0 | mov esi, eax // 0fb7450c | movzx eax, word ptr [ebp + 0xc] $sequence_7 = { 6800010000 56 e8???????? 46 } // n = 4, score = 400 // 6800010000 | push 0x100 // 56 | push esi // e8???????? | // 46 | inc esi $sequence_8 = { 6a20 68???????? 68???????? 8975f8 8b08 50 ff5150 } // n = 7, score = 400 // 6a20 | push 0x20 // 68???????? | // 68???????? | // 8975f8 | mov dword ptr [ebp - 8], esi // 8b08 | mov ecx, dword ptr [eax] // 50 | push eax // ff5150 | call dword ptr [ecx + 0x50] $sequence_9 = { 8b3d???????? 43 68???????? 895e08 ffd7 6a00 } // n = 6, score = 400 // 8b3d???????? | // 43 | inc ebx // 68???????? | // 895e08 | mov dword ptr [esi + 8], ebx // ffd7 | call edi // 6a00 | push 0 condition: 7 of them and filesize < 139264 }
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