Actor(s): PowerPool
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rule win_slothfulmedia_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-03-28" 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 = "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 = { 99 8bc8 0fb745d2 894618 0fafc7 33ca } // n = 6, score = 200 // 99 | cdq // 8bc8 | mov ecx, eax // 0fb745d2 | movzx eax, word ptr [ebp - 0x2e] // 894618 | mov dword ptr [esi + 0x18], eax // 0fafc7 | imul eax, edi // 33ca | xor ecx, edx $sequence_1 = { 6a01 ff30 897dfc ff75f0 ff15???????? } // n = 5, score = 200 // 6a01 | push 1 // ff30 | push dword ptr [eax] // 897dfc | mov dword ptr [ebp - 4], edi // ff75f0 | push dword ptr [ebp - 0x10] // ff15???????? | $sequence_2 = { ff15???????? 8d85e8fdffff 50 33db 53 53 } // n = 6, score = 200 // ff15???????? | // 8d85e8fdffff | lea eax, [ebp - 0x218] // 50 | push eax // 33db | xor ebx, ebx // 53 | push ebx // 53 | push ebx $sequence_3 = { 8b3d???????? 53 53 b919040000 } // n = 4, score = 200 // 8b3d???????? | // 53 | push ebx // 53 | push ebx // b919040000 | mov ecx, 0x419 $sequence_4 = { eb1f 6816020780 e8???????? e8???????? 8d0c5f } // n = 5, score = 200 // eb1f | jmp 0x21 // 6816020780 | push 0x80070216 // e8???????? | // e8???????? | // 8d0c5f | lea ecx, [edi + ebx*2] $sequence_5 = { 8d45b0 56 50 8bfa c745ac44000000 } // n = 5, score = 200 // 8d45b0 | lea eax, [ebp - 0x50] // 56 | push esi // 50 | push eax // 8bfa | mov edi, edx // c745ac44000000 | mov dword ptr [ebp - 0x54], 0x44 $sequence_6 = { ff15???????? ff7608 668945ee ff15???????? 8945f0 } // n = 5, score = 200 // ff15???????? | // ff7608 | push dword ptr [esi + 8] // 668945ee | mov word ptr [ebp - 0x12], ax // ff15???????? | // 8945f0 | mov dword ptr [ebp - 0x10], eax $sequence_7 = { 50 e8???????? 6a01 57 ff742428 8d9e4c040000 } // n = 6, score = 200 // 50 | push eax // e8???????? | // 6a01 | push 1 // 57 | push edi // ff742428 | push dword ptr [esp + 0x28] // 8d9e4c040000 | lea ebx, [esi + 0x44c] $sequence_8 = { 57 68d0070000 ff15???????? 33c0 6806020000 } // n = 5, score = 100 // 57 | push edi // 68d0070000 | push 0x7d0 // ff15???????? | // 33c0 | xor eax, eax // 6806020000 | push 0x206 $sequence_9 = { 6a00 8d4c2410 51 ff15???????? 8b8c2410020000 } // n = 5, score = 100 // 6a00 | push 0 // 8d4c2410 | lea ecx, [esp + 0x10] // 51 | push ecx // ff15???????? | // 8b8c2410020000 | mov ecx, dword ptr [esp + 0x210] $sequence_10 = { 51 6689442414 e8???????? 83c40c 6a00 } // n = 5, score = 100 // 51 | push ecx // 6689442414 | mov word ptr [esp + 0x14], ax // e8???????? | // 83c40c | add esp, 0xc // 6a00 | push 0 $sequence_11 = { 5e 33cc 33c0 e8???????? 81c40c020000 c21000 3b0d???????? } // n = 7, score = 100 // 5e | pop esi // 33cc | xor ecx, esp // 33c0 | xor eax, eax // e8???????? | // 81c40c020000 | add esp, 0x20c // c21000 | ret 0x10 // 3b0d???????? | $sequence_12 = { 74ee 6804010000 8d54240c 6a00 52 e8???????? } // n = 6, score = 100 // 74ee | je 0xfffffff0 // 6804010000 | push 0x104 // 8d54240c | lea edx, [esp + 0xc] // 6a00 | push 0 // 52 | push edx // e8???????? | $sequence_13 = { 83c40c 6804010000 8d44240c 50 6a00 ff15???????? 6a04 } // n = 7, score = 100 // 83c40c | add esp, 0xc // 6804010000 | push 0x104 // 8d44240c | lea eax, [esp + 0xc] // 50 | push eax // 6a00 | push 0 // ff15???????? | // 6a04 | push 4 $sequence_14 = { ffd6 85c0 7507 ffd7 83f805 } // n = 5, score = 100 // ffd6 | call esi // 85c0 | test eax, eax // 7507 | jne 9 // ffd7 | call edi // 83f805 | cmp eax, 5 $sequence_15 = { 33c4 89842408020000 56 57 68d0070000 } // n = 5, score = 100 // 33c4 | xor eax, esp // 89842408020000 | mov dword ptr [esp + 0x208], eax // 56 | push esi // 57 | push edi // 68d0070000 | push 0x7d0 condition: 7 of them and filesize < 122880 }
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