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rule win_vskimmer_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.vskimmer" 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 = { 5e c3 6a5c 58 6689463c ebf2 } // n = 6, score = 100 // 5e | pop esi // c3 | ret // 6a5c | push 0x5c // 58 | pop eax // 6689463c | mov word ptr [esi + 0x3c], ax // ebf2 | jmp 0xfffffff4 $sequence_1 = { 8d85e8fdffff 50 8d8dc4fbffff e8???????? 83ec1c } // n = 5, score = 100 // 8d85e8fdffff | lea eax, [ebp - 0x218] // 50 | push eax // 8d8dc4fbffff | lea ecx, [ebp - 0x43c] // e8???????? | // 83ec1c | sub esp, 0x1c $sequence_2 = { 6800040000 33db 8d8588f6ffff 53 } // n = 4, score = 100 // 6800040000 | push 0x400 // 33db | xor ebx, ebx // 8d8588f6ffff | lea eax, [ebp - 0x978] // 53 | push ebx $sequence_3 = { 68???????? 8d45f4 50 c745f484034200 e8???????? cc 8bff } // n = 7, score = 100 // 68???????? | // 8d45f4 | lea eax, [ebp - 0xc] // 50 | push eax // c745f484034200 | mov dword ptr [ebp - 0xc], 0x420384 // e8???????? | // cc | int3 // 8bff | mov edi, edi $sequence_4 = { 75da 8b4508 8b4d10 8908 e9???????? 55 8bec } // n = 7, score = 100 // 75da | jne 0xffffffdc // 8b4508 | mov eax, dword ptr [ebp + 8] // 8b4d10 | mov ecx, dword ptr [ebp + 0x10] // 8908 | mov dword ptr [eax], ecx // e9???????? | // 55 | push ebp // 8bec | mov ebp, esp $sequence_5 = { 8b4604 57 8b3e 8945ec 8bc7 8945f0 } // n = 6, score = 100 // 8b4604 | mov eax, dword ptr [esi + 4] // 57 | push edi // 8b3e | mov edi, dword ptr [esi] // 8945ec | mov dword ptr [ebp - 0x14], eax // 8bc7 | mov eax, edi // 8945f0 | mov dword ptr [ebp - 0x10], eax $sequence_6 = { 50 ffb314020000 8d45f4 ff33 50 e8???????? 8b00 } // n = 7, score = 100 // 50 | push eax // ffb314020000 | push dword ptr [ebx + 0x214] // 8d45f4 | lea eax, [ebp - 0xc] // ff33 | push dword ptr [ebx] // 50 | push eax // e8???????? | // 8b00 | mov eax, dword ptr [eax] $sequence_7 = { 837e1c00 7423 8b461c 8b4808 } // n = 4, score = 100 // 837e1c00 | cmp dword ptr [esi + 0x1c], 0 // 7423 | je 0x25 // 8b461c | mov eax, dword ptr [esi + 0x1c] // 8b4808 | mov ecx, dword ptr [eax + 8] $sequence_8 = { 03d7 2bd9 3bda 0f8391000000 52 8bce e8???????? } // n = 7, score = 100 // 03d7 | add edx, edi // 2bd9 | sub ebx, ecx // 3bda | cmp ebx, edx // 0f8391000000 | jae 0x97 // 52 | push edx // 8bce | mov ecx, esi // e8???????? | $sequence_9 = { 80fa29 7410 f6414410 750e 8a00 3c7b } // n = 6, score = 100 // 80fa29 | cmp dl, 0x29 // 7410 | je 0x12 // f6414410 | test byte ptr [ecx + 0x44], 0x10 // 750e | jne 0x10 // 8a00 | mov al, byte ptr [eax] // 3c7b | cmp al, 0x7b condition: 7 of them and filesize < 376832 }
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