Actor(s): PowerPool
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rule win_slothfulmedia_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-04-08" version = "1" description = "Detects win.slothfulmedia." 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.slothfulmedia" 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 = { c6833802000001 e9???????? 53 e8???????? e9???????? 5f } // n = 6, score = 200 // c6833802000001 | mov byte ptr [ebx + 0x238], 1 // e9???????? | // 53 | push ebx // e8???????? | // e9???????? | // 5f | pop edi $sequence_1 = { 6805400080 e8???????? 8b75f0 6bf64c 037510 8d7dd0 } // n = 6, score = 200 // 6805400080 | push 0x80004005 // e8???????? | // 8b75f0 | mov esi, dword ptr [ebp - 0x10] // 6bf64c | imul esi, esi, 0x4c // 037510 | add esi, dword ptr [ebp + 0x10] // 8d7dd0 | lea edi, dword ptr [ebp - 0x30] $sequence_2 = { ff15???????? 6a04 ff15???????? 8b8e5c040000 8b8970010000 6a01 6a04 } // n = 7, score = 200 // ff15???????? | // 6a04 | push 4 // ff15???????? | // 8b8e5c040000 | mov ecx, dword ptr [esi + 0x45c] // 8b8970010000 | mov ecx, dword ptr [ecx + 0x170] // 6a01 | push 1 // 6a04 | push 4 $sequence_3 = { 8b450c 83c0fc 50 8d85a0fdffff 53 } // n = 5, score = 200 // 8b450c | mov eax, dword ptr [ebp + 0xc] // 83c0fc | add eax, -4 // 50 | push eax // 8d85a0fdffff | lea eax, dword ptr [ebp - 0x260] // 53 | push ebx $sequence_4 = { 33ff 83c0ec 8bf1 8945fc 745a 53 8b45fc } // n = 7, score = 200 // 33ff | xor edi, edi // 83c0ec | add eax, -0x14 // 8bf1 | mov esi, ecx // 8945fc | mov dword ptr [ebp - 4], eax // 745a | je 0x5c // 53 | push ebx // 8b45fc | mov eax, dword ptr [ebp - 4] $sequence_5 = { 899ef4040000 ff15???????? 8bf8 83ffff 744f 53 8d45fc } // n = 7, score = 200 // 899ef4040000 | mov dword ptr [esi + 0x4f4], ebx // ff15???????? | // 8bf8 | mov edi, eax // 83ffff | cmp edi, -1 // 744f | je 0x51 // 53 | push ebx // 8d45fc | lea eax, dword ptr [ebp - 4] $sequence_6 = { 32db e8???????? 83c40c 8d45fc 50 } // n = 5, score = 200 // 32db | xor bl, bl // e8???????? | // 83c40c | add esp, 0xc // 8d45fc | lea eax, dword ptr [ebp - 4] // 50 | push eax $sequence_7 = { ffd6 6a40 8d45ac 57 50 c745a844000000 e8???????? } // n = 7, score = 200 // ffd6 | call esi // 6a40 | push 0x40 // 8d45ac | lea eax, dword ptr [ebp - 0x54] // 57 | push edi // 50 | push eax // c745a844000000 | mov dword ptr [ebp - 0x58], 0x44 // e8???????? | $sequence_8 = { ff15???????? 8b8c2410020000 5f 5e 33cc } // n = 5, score = 100 // ff15???????? | // 8b8c2410020000 | mov ecx, dword ptr [esp + 0x210] // 5f | pop edi // 5e | pop esi // 33cc | xor ecx, esp $sequence_9 = { 6689442414 e8???????? 83c40c 6a00 ff15???????? 8b35???????? 8b3d???????? } // n = 7, score = 100 // 6689442414 | mov word ptr [esp + 0x14], ax // e8???????? | // 83c40c | add esp, 0xc // 6a00 | push 0 // ff15???????? | // 8b35???????? | // 8b3d???????? | $sequence_10 = { 8b35???????? 8b3d???????? 90 68???????? ffd6 85c0 7507 } // n = 7, score = 100 // 8b35???????? | // 8b3d???????? | // 90 | nop // 68???????? | // ffd6 | call esi // 85c0 | test eax, eax // 7507 | jne 9 $sequence_11 = { 81c40c020000 c21000 3b0d???????? 7502 f3c3 e9???????? } // n = 6, score = 100 // 81c40c020000 | add esp, 0x20c // c21000 | ret 0x10 // 3b0d???????? | // 7502 | jne 4 // f3c3 | ret // e9???????? | $sequence_12 = { 33cc 33c0 e8???????? 81c40c020000 c21000 3b0d???????? } // n = 6, score = 100 // 33cc | xor ecx, esp // 33c0 | xor eax, eax // e8???????? | // 81c40c020000 | add esp, 0x20c // c21000 | ret 0x10 // 3b0d???????? | $sequence_13 = { 83f805 74ee 6804010000 8d54240c 6a00 52 } // n = 6, score = 100 // 83f805 | cmp eax, 5 // 74ee | je 0xfffffff0 // 6804010000 | push 0x104 // 8d54240c | lea edx, dword ptr [esp + 0xc] // 6a00 | push 0 // 52 | push edx $sequence_14 = { 6a00 52 e8???????? 83c40c 6804010000 8d44240c 50 } // n = 7, score = 100 // 6a00 | push 0 // 52 | push edx // e8???????? | // 83c40c | add esp, 0xc // 6804010000 | push 0x104 // 8d44240c | lea eax, dword ptr [esp + 0xc] // 50 | push eax $sequence_15 = { ffd6 85c0 7507 ffd7 83f805 74ee 6804010000 } // n = 7, score = 100 // ffd6 | call esi // 85c0 | test eax, eax // 7507 | jne 9 // ffd7 | call edi // 83f805 | cmp eax, 5 // 74ee | je 0xfffffff0 // 6804010000 | push 0x104 condition: 7 of them and filesize < 122880 }
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