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rule win_rover_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.rover" 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 = { 85ed 744f 8b7c243c 8b471c 85c0 7415 8b4e0c } // n = 7, score = 100 // 85ed | test ebp, ebp // 744f | je 0x51 // 8b7c243c | mov edi, dword ptr [esp + 0x3c] // 8b471c | mov eax, dword ptr [edi + 0x1c] // 85c0 | test eax, eax // 7415 | je 0x17 // 8b4e0c | mov ecx, dword ptr [esi + 0xc] $sequence_1 = { 8d8dc8feffff ff25???????? 8d8dacfeffff ff25???????? a1???????? 50 6a02 } // n = 7, score = 100 // 8d8dc8feffff | lea ecx, [ebp - 0x138] // ff25???????? | // 8d8dacfeffff | lea ecx, [ebp - 0x154] // ff25???????? | // a1???????? | // 50 | push eax // 6a02 | push 2 $sequence_2 = { eb61 3bfd 7531 c7865005000001000000 3bdd 744f 8b4c241c } // n = 7, score = 100 // eb61 | jmp 0x63 // 3bfd | cmp edi, ebp // 7531 | jne 0x33 // c7865005000001000000 | mov dword ptr [esi + 0x550], 1 // 3bdd | cmp ebx, ebp // 744f | je 0x51 // 8b4c241c | mov ecx, dword ptr [esp + 0x1c] $sequence_3 = { 668906 c744241801000000 803e3f 7527 8bc6 8d5001 90 } // n = 7, score = 100 // 668906 | mov word ptr [esi], ax // c744241801000000 | mov dword ptr [esp + 0x18], 1 // 803e3f | cmp byte ptr [esi], 0x3f // 7527 | jne 0x29 // 8bc6 | mov eax, esi // 8d5001 | lea edx, [eax + 1] // 90 | nop $sequence_4 = { 51 ffd5 8bd8 83c408 85db 742e 8d5301 } // n = 7, score = 100 // 51 | push ecx // ffd5 | call ebp // 8bd8 | mov ebx, eax // 83c408 | add esp, 8 // 85db | test ebx, ebx // 742e | je 0x30 // 8d5301 | lea edx, [ebx + 1] $sequence_5 = { 33ed 8a06 ff442424 8b54241c 84c0 0f858ffcffff 3bd3 } // n = 7, score = 100 // 33ed | xor ebp, ebp // 8a06 | mov al, byte ptr [esi] // ff442424 | inc dword ptr [esp + 0x24] // 8b54241c | mov edx, dword ptr [esp + 0x1c] // 84c0 | test al, al // 0f858ffcffff | jne 0xfffffc95 // 3bd3 | cmp edx, ebx $sequence_6 = { 83c404 c7460400000000 c70600000000 83f8ff 740a 50 ff15???????? } // n = 7, score = 100 // 83c404 | add esp, 4 // c7460400000000 | mov dword ptr [esi + 4], 0 // c70600000000 | mov dword ptr [esi], 0 // 83f8ff | cmp eax, -1 // 740a | je 0xc // 50 | push eax // ff15???????? | $sequence_7 = { 8bd8 83c40c 85db 742c 8d442434 50 e8???????? } // n = 7, score = 100 // 8bd8 | mov ebx, eax // 83c40c | add esp, 0xc // 85db | test ebx, ebx // 742c | je 0x2e // 8d442434 | lea eax, [esp + 0x34] // 50 | push eax // e8???????? | $sequence_8 = { e8???????? 8b5c2418 56 33ed 53 89aed8050000 c7460c11000000 } // n = 7, score = 100 // e8???????? | // 8b5c2418 | mov ebx, dword ptr [esp + 0x18] // 56 | push esi // 33ed | xor ebp, ebp // 53 | push ebx // 89aed8050000 | mov dword ptr [esi + 0x5d8], ebp // c7460c11000000 | mov dword ptr [esi + 0xc], 0x11 $sequence_9 = { 8b8eb4010000 6a00 53 51 ffd0 8bf8 83c40c } // n = 7, score = 100 // 8b8eb4010000 | mov ecx, dword ptr [esi + 0x1b4] // 6a00 | push 0 // 53 | push ebx // 51 | push ecx // ffd0 | call eax // 8bf8 | mov edi, eax // 83c40c | add esp, 0xc condition: 7 of them and filesize < 704512 }
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