Actor(s): Pirate Panda
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rule win_winsloader_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2020-12-22" version = "1" description = "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.winsloader" malpedia_rule_date = "20201222" malpedia_hash = "30354d830a29f0fbd3714d93d94dea941d77a130" malpedia_version = "20201023" 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 = { 895dfc 3bc3 741a 33c9 8d9b00000000 } // n = 5, score = 200 // 895dfc | mov dword ptr [ebp - 4], ebx // 3bc3 | cmp eax, ebx // 741a | je 0x1c // 33c9 | xor ecx, ecx // 8d9b00000000 | lea ebx, [ebx] $sequence_1 = { 8d8375050000 6a00 a3???????? ff15???????? } // n = 4, score = 200 // 8d8375050000 | lea eax, [ebx + 0x575] // 6a00 | push 0 // a3???????? | // ff15???????? | $sequence_2 = { 83c40c 6800040000 8d8dfcf7ffff 51 } // n = 4, score = 200 // 83c40c | add esp, 0xc // 6800040000 | push 0x400 // 8d8dfcf7ffff | lea ecx, [ebp - 0x804] // 51 | push ecx $sequence_3 = { f3a5 83c40c a4 ffd0 5b } // n = 5, score = 200 // f3a5 | rep movsd dword ptr es:[edi], dword ptr [esi] // 83c40c | add esp, 0xc // a4 | movsb byte ptr es:[edi], byte ptr [esi] // ffd0 | call eax // 5b | pop ebx $sequence_4 = { 8d45d8 50 53 56 57 c745d800000000 } // n = 6, score = 200 // 8d45d8 | lea eax, [ebp - 0x28] // 50 | push eax // 53 | push ebx // 56 | push esi // 57 | push edi // c745d800000000 | mov dword ptr [ebp - 0x28], 0 $sequence_5 = { 8a10 40 84d2 75f9 2bc1 0fb6f8 888435fefbffff } // n = 7, score = 200 // 8a10 | mov dl, byte ptr [eax] // 40 | inc eax // 84d2 | test dl, dl // 75f9 | jne 0xfffffffb // 2bc1 | sub eax, ecx // 0fb6f8 | movzx edi, al // 888435fefbffff | mov byte ptr [ebp + esi - 0x402], al $sequence_6 = { e8???????? 6820800000 e8???????? 83c410 8945dc } // n = 5, score = 200 // e8???????? | // 6820800000 | push 0x8020 // e8???????? | // 83c410 | add esp, 0x10 // 8945dc | mov dword ptr [ebp - 0x24], eax $sequence_7 = { 53 8d95fcfbffff 52 0590120000 b920010000 be???????? } // n = 6, score = 200 // 53 | push ebx // 8d95fcfbffff | lea edx, [ebp - 0x404] // 52 | push edx // 0590120000 | add eax, 0x1290 // b920010000 | mov ecx, 0x120 // be???????? | $sequence_8 = { 8945fc 68ff030000 8d85fdf7ffff 6a00 } // n = 4, score = 200 // 8945fc | mov dword ptr [ebp - 4], eax // 68ff030000 | push 0x3ff // 8d85fdf7ffff | lea eax, [ebp - 0x803] // 6a00 | push 0 $sequence_9 = { c745cc231a0110 a1???????? 8d4dc8 33c1 8945d0 8b4518 } // n = 6, score = 100 // c745cc231a0110 | mov dword ptr [ebp - 0x34], 0x10011a23 // a1???????? | // 8d4dc8 | lea ecx, [ebp - 0x38] // 33c1 | xor eax, ecx // 8945d0 | mov dword ptr [ebp - 0x30], eax // 8b4518 | mov eax, dword ptr [ebp + 0x18] $sequence_10 = { 51 8d45e0 0f57c0 50 0f1145e0 e8???????? } // n = 6, score = 100 // 51 | push ecx // 8d45e0 | lea eax, [ebp - 0x20] // 0f57c0 | xorps xmm0, xmm0 // 50 | push eax // 0f1145e0 | movups xmmword ptr [ebp - 0x20], xmm0 // e8???????? | $sequence_11 = { 8945f0 8b450c 8945f4 8b4514 40 c745ec60190110 894df8 } // n = 7, score = 100 // 8945f0 | mov dword ptr [ebp - 0x10], eax // 8b450c | mov eax, dword ptr [ebp + 0xc] // 8945f4 | mov dword ptr [ebp - 0xc], eax // 8b4514 | mov eax, dword ptr [ebp + 0x14] // 40 | inc eax // c745ec60190110 | mov dword ptr [ebp - 0x14], 0x10011960 // 894df8 | mov dword ptr [ebp - 8], ecx $sequence_12 = { 8b85f8f3ffff 50 8d8dfcfbffff 51 8b95e4f3ffff 0395ecf3ffff } // n = 6, score = 100 // 8b85f8f3ffff | mov eax, dword ptr [ebp - 0xc08] // 50 | push eax // 8d8dfcfbffff | lea ecx, [ebp - 0x404] // 51 | push ecx // 8b95e4f3ffff | mov edx, dword ptr [ebp - 0xc1c] // 0395ecf3ffff | add edx, dword ptr [ebp - 0xc14] $sequence_13 = { 668b9560f3ffff 668995f0f3ffff 8b85f8f3ffff 668b8df0f3ffff 66898c05fcfbffff 8b95f8f3ffff } // n = 6, score = 100 // 668b9560f3ffff | mov dx, word ptr [ebp - 0xca0] // 668995f0f3ffff | mov word ptr [ebp - 0xc10], dx // 8b85f8f3ffff | mov eax, dword ptr [ebp - 0xc08] // 668b8df0f3ffff | mov cx, word ptr [ebp - 0xc10] // 66898c05fcfbffff | mov word ptr [ebp + eax - 0x404], cx // 8b95f8f3ffff | mov edx, dword ptr [ebp - 0xc08] $sequence_14 = { 53 57 894c2424 e8???????? 83c408 } // n = 5, score = 100 // 53 | push ebx // 57 | push edi // 894c2424 | mov dword ptr [esp + 0x24], ecx // e8???????? | // 83c408 | add esp, 8 $sequence_15 = { 6a00 50 e8???????? 8945cc 8d45cc } // n = 5, score = 100 // 6a00 | push 0 // 50 | push eax // e8???????? | // 8945cc | mov dword ptr [ebp - 0x34], eax // 8d45cc | lea eax, [ebp - 0x34] condition: 7 of them and filesize < 270336 }
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