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 = "2022-04-08" 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 = "20220405" malpedia_hash = "ecd38294bd47d5589be5cd5490dc8bb4804afc2a" malpedia_version = "20220411" 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 = { 68???????? 895e08 ffd7 6a00 53 } // n = 5, score = 400 // 68???????? | // 895e08 | mov dword ptr [esi + 8], ebx // ffd7 | call edi // 6a00 | push 0 // 53 | push ebx $sequence_1 = { ffd0 5d c3 68???????? } // n = 4, score = 400 // ffd0 | call eax // 5d | pop ebp // c3 | ret // 68???????? | $sequence_2 = { e8???????? 46 81feff000000 7cd9 6a01 ff15???????? ebcc } // n = 7, score = 400 // e8???????? | // 46 | inc esi // 81feff000000 | cmp esi, 0xff // 7cd9 | jl 0xffffffdb // 6a01 | push 1 // ff15???????? | // ebcc | jmp 0xffffffce $sequence_3 = { 50 ffd6 85c0 7fdf 5e } // n = 5, score = 400 // 50 | push eax // ffd6 | call esi // 85c0 | test eax, eax // 7fdf | jg 0xffffffe1 // 5e | pop esi $sequence_4 = { 895020 895024 5d c3 55 8bec } // n = 6, score = 400 // 895020 | mov dword ptr [eax + 0x20], edx // 895024 | mov dword ptr [eax + 0x24], edx // 5d | pop ebp // c3 | ret // 55 | push ebp // 8bec | mov ebp, esp $sequence_5 = { 8975f0 ff15???????? 8b45f0 8d55f4 52 56 56 } // n = 7, score = 400 // 8975f0 | mov dword ptr [ebp - 0x10], esi // ff15???????? | // 8b45f0 | mov eax, dword ptr [ebp - 0x10] // 8d55f4 | lea edx, dword ptr [ebp - 0xc] // 52 | push edx // 56 | push esi // 56 | push esi $sequence_6 = { 6a01 ff15???????? ebcc 55 8bec } // n = 5, score = 400 // 6a01 | push 1 // ff15???????? | // ebcc | jmp 0xffffffce // 55 | push ebp // 8bec | mov ebp, esp $sequence_7 = { 68???????? ff15???????? 68???????? 50 ff15???????? ff750c a3???????? } // n = 7, score = 400 // 68???????? | // ff15???????? | // 68???????? | // 50 | push eax // ff15???????? | // ff750c | push dword ptr [ebp + 0xc] // a3???????? | $sequence_8 = { 50 ff15???????? 8b45fc 8b08 56 } // n = 5, score = 400 // 50 | push eax // ff15???????? | // 8b45fc | mov eax, dword ptr [ebp - 4] // 8b08 | mov ecx, dword ptr [eax] // 56 | push esi $sequence_9 = { ff15???????? b90180ffff 663bc1 750d 6a00 } // n = 5, score = 400 // ff15???????? | // b90180ffff | mov ecx, 0xffff8001 // 663bc1 | cmp ax, cx // 750d | jne 0xf // 6a00 | push 0 condition: 7 of them and filesize < 139264 }
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