Actor(s): Sofacy
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rule win_zebrocy_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2020-05-30" version = "1" description = "autogenerated rule brought to you by yara-signator" tool = "yara-signator v0.4.0" tool_config = "callsandjumps;datarefs;binvalue" malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.zebrocy" malpedia_rule_date = "20200529" malpedia_hash = "92c362319514e5a6da26204961446caa3a8b32a8" malpedia_version = "20200529" 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 / approach 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 = { 89435c 33c0 894350 894354 8b4308 8b10 } // n = 6, score = 1100 // 89435c | mov dword ptr [ebx + 0x5c], eax // 33c0 | xor eax, eax // 894350 | mov dword ptr [ebx + 0x50], eax // 894354 | mov dword ptr [ebx + 0x54], eax // 8b4308 | mov eax, dword ptr [ebx + 8] // 8b10 | mov edx, dword ptr [eax] $sequence_1 = { 64ff32 648922 8b5508 81faffff0000 7605 e8???????? } // n = 6, score = 1100 // 64ff32 | push dword ptr fs:[edx] // 648922 | mov dword ptr fs:[edx], esp // 8b5508 | mov edx, dword ptr [ebp + 8] // 81faffff0000 | cmp edx, 0xffff // 7605 | jbe 7 // e8???????? | $sequence_2 = { e8???????? 8b4dd4 b201 a1???????? e8???????? e8???????? eb21 } // n = 7, score = 1100 // e8???????? | // 8b4dd4 | mov ecx, dword ptr [ebp - 0x2c] // b201 | mov dl, 1 // a1???????? | // e8???????? | // e8???????? | // eb21 | jmp 0x23 $sequence_3 = { 8945e4 b8???????? 8945e8 8d55e4 8b45f8 8b80b0000000 b901000000 } // n = 7, score = 1100 // 8945e4 | mov dword ptr [ebp - 0x1c], eax // b8???????? | // 8945e8 | mov dword ptr [ebp - 0x18], eax // 8d55e4 | lea edx, [ebp - 0x1c] // 8b45f8 | mov eax, dword ptr [ebp - 8] // 8b80b0000000 | mov eax, dword ptr [eax + 0xb0] // b901000000 | mov ecx, 1 $sequence_4 = { 8902 eb60 c745fc1c000000 8d45fc 50 8d45d0 } // n = 6, score = 1100 // 8902 | mov dword ptr [edx], eax // eb60 | jmp 0x62 // c745fc1c000000 | mov dword ptr [ebp - 4], 0x1c // 8d45fc | lea eax, [ebp - 4] // 50 | push eax // 8d45d0 | lea eax, [ebp - 0x30] $sequence_5 = { bf01000000 e9???????? 8d45e8 8b55fc } // n = 4, score = 1100 // bf01000000 | mov edi, 1 // e9???????? | // 8d45e8 | lea eax, [ebp - 0x18] // 8b55fc | mov edx, dword ptr [ebp - 4] $sequence_6 = { 8b4dfc 0fbf0c51 3bd9 7507 e8???????? eb67 } // n = 6, score = 1100 // 8b4dfc | mov ecx, dword ptr [ebp - 4] // 0fbf0c51 | movsx ecx, word ptr [ecx + edx*2] // 3bd9 | cmp ebx, ecx // 7507 | jne 9 // e8???????? | // eb67 | jmp 0x69 $sequence_7 = { 6683e802 7408 6683e815 743a } // n = 4, score = 1100 // 6683e802 | sub ax, 2 // 7408 | je 0xa // 6683e815 | sub ax, 0x15 // 743a | je 0x3c $sequence_8 = { 896c2404 e8???????? 8b442408 89442418 } // n = 4, score = 700 // 896c2404 | mov dword ptr [esp + 4], ebp // e8???????? | // 8b442408 | mov eax, dword ptr [esp + 8] // 89442418 | mov dword ptr [esp + 0x18], eax $sequence_9 = { 8b74242c e9???????? e8???????? 0f0b e8???????? 0f0b } // n = 6, score = 700 // 8b74242c | mov esi, dword ptr [esp + 0x2c] // e9???????? | // e8???????? | // 0f0b | ud2 // e8???????? | // 0f0b | ud2 $sequence_10 = { 895c244c 83c42c c3 e8???????? 0f0b e8???????? } // n = 6, score = 700 // 895c244c | mov dword ptr [esp + 0x4c], ebx // 83c42c | add esp, 0x2c // c3 | ret // e8???????? | // 0f0b | ud2 // e8???????? | $sequence_11 = { e9???????? 95 80f808 95 } // n = 4, score = 500 // e9???????? | // 95 | xchg eax, ebp // 80f808 | cmp al, 8 // 95 | xchg eax, ebp $sequence_12 = { 0f848b000000 8b442418 83f801 7d0a b801000000 e9???????? } // n = 6, score = 500 // 0f848b000000 | je 0x91 // 8b442418 | mov eax, dword ptr [esp + 0x18] // 83f801 | cmp eax, 1 // 7d0a | jge 0xc // b801000000 | mov eax, 1 // e9???????? | $sequence_13 = { 90 e8???????? 81c4bc000000 c3 90 } // n = 5, score = 500 // 90 | nop // e8???????? | // 81c4bc000000 | add esp, 0xbc // c3 | ret // 90 | nop $sequence_14 = { 895c2408 8944240c c7442410ffff1000 e8???????? } // n = 4, score = 500 // 895c2408 | mov dword ptr [esp + 8], ebx // 8944240c | mov dword ptr [esp + 0xc], eax // c7442410ffff1000 | mov dword ptr [esp + 0x10], 0x10ffff // e8???????? | $sequence_15 = { e8???????? 8b4c2414 8b442428 8b542420 e9???????? 8b05???????? 8b0d???????? } // n = 7, score = 500 // e8???????? | // 8b4c2414 | mov ecx, dword ptr [esp + 0x14] // 8b442428 | mov eax, dword ptr [esp + 0x28] // 8b542420 | mov edx, dword ptr [esp + 0x20] // e9???????? | // 8b05???????? | // 8b0d???????? | $sequence_16 = { 89442404 e8???????? 8b4c2408 8b6c240c } // n = 4, score = 500 // 89442404 | mov dword ptr [esp + 4], eax // e8???????? | // 8b4c2408 | mov ecx, dword ptr [esp + 8] // 8b6c240c | mov ebp, dword ptr [esp + 0xc] $sequence_17 = { bdffffffff e9???????? 31db e9???????? 31db e9???????? } // n = 6, score = 500 // bdffffffff | mov ebp, 0xffffffff // e9???????? | // 31db | xor ebx, ebx // e9???????? | // 31db | xor ebx, ebx // e9???????? | $sequence_18 = { 89442430 8b442470 89442434 8b442474 89442438 c744244800000000 c744244c00000000 } // n = 7, score = 500 // 89442430 | mov dword ptr [esp + 0x30], eax // 8b442470 | mov eax, dword ptr [esp + 0x70] // 89442434 | mov dword ptr [esp + 0x34], eax // 8b442474 | mov eax, dword ptr [esp + 0x74] // 89442438 | mov dword ptr [esp + 0x38], eax // c744244800000000 | mov dword ptr [esp + 0x48], 0 // c744244c00000000 | mov dword ptr [esp + 0x4c], 0 $sequence_19 = { 648b0d14000000 8b8900000000 3b6108 0f8616020000 83ec30 } // n = 5, score = 500 // 648b0d14000000 | mov ecx, dword ptr fs:[0x14] // 8b8900000000 | mov ecx, dword ptr [ecx] // 3b6108 | cmp esp, dword ptr [ecx + 8] // 0f8616020000 | jbe 0x21c // 83ec30 | sub esp, 0x30 $sequence_20 = { 39c8 0f87c4000000 29c1 8b54244c } // n = 4, score = 500 // 39c8 | cmp eax, ecx // 0f87c4000000 | ja 0xca // 29c1 | sub ecx, eax // 8b54244c | mov edx, dword ptr [esp + 0x4c] $sequence_21 = { 5e 5d c20400 8b01 55 89e5 } // n = 6, score = 100 // 5e | pop esi // 5d | pop ebp // c20400 | ret 4 // 8b01 | mov eax, dword ptr [ecx] // 55 | push ebp // 89e5 | mov ebp, esp $sequence_22 = { e9???????? 8bb5f4f4ffff e9???????? 8b542408 8d420c 8b8aecf4ffff } // n = 6, score = 100 // e9???????? | // 8bb5f4f4ffff | mov esi, dword ptr [ebp - 0xb0c] // e9???????? | // 8b542408 | mov edx, dword ptr [esp + 8] // 8d420c | lea eax, [edx + 0xc] // 8b8aecf4ffff | mov ecx, dword ptr [edx - 0xb14] $sequence_23 = { 0f8422020000 8b4004 03c3 8d7de8 e8???????? 8bf8 } // n = 6, score = 100 // 0f8422020000 | je 0x228 // 8b4004 | mov eax, dword ptr [eax + 4] // 03c3 | add eax, ebx // 8d7de8 | lea edi, [ebp - 0x18] // e8???????? | // 8bf8 | mov edi, eax $sequence_24 = { e8???????? 52 89c1 e8???????? 85c0 89c3 7405 } // n = 7, score = 100 // e8???????? | // 52 | push edx // 89c1 | mov ecx, eax // e8???????? | // 85c0 | test eax, eax // 89c3 | mov ebx, eax // 7405 | je 7 $sequence_25 = { 8d8d5cf7ffff e8???????? 6a04 8d9d40f7ffff c645fc08 e8???????? 83c404 } // n = 7, score = 100 // 8d8d5cf7ffff | lea ecx, [ebp - 0x8a4] // e8???????? | // 6a04 | push 4 // 8d9d40f7ffff | lea ebx, [ebp - 0x8c0] // c645fc08 | mov byte ptr [ebp - 4], 8 // e8???????? | // 83c404 | add esp, 4 $sequence_26 = { 89d8 e8???????? 890c24 8b4de4 89c2 e8???????? 85c0 } // n = 7, score = 100 // 89d8 | mov eax, ebx // e8???????? | // 890c24 | mov dword ptr [esp], ecx // 8b4de4 | mov ecx, dword ptr [ebp - 0x1c] // 89c2 | mov edx, eax // e8???????? | // 85c0 | test eax, eax $sequence_27 = { c78568ffffff24434200 e8???????? 83c404 3975e8 } // n = 4, score = 100 // c78568ffffff24434200 | mov dword ptr [ebp - 0x98], 0x424324 // e8???????? | // 83c404 | add esp, 4 // 3975e8 | cmp dword ptr [ebp - 0x18], esi $sequence_28 = { 0fb6d1 89d9 e8???????? 89c1 } // n = 4, score = 100 // 0fb6d1 | movzx edx, cl // 89d9 | mov ecx, ebx // e8???????? | // 89c1 | mov ecx, eax $sequence_29 = { 33ff ffb710904200 ff15???????? 898710904200 83c704 } // n = 5, score = 100 // 33ff | xor edi, edi // ffb710904200 | push dword ptr [edi + 0x429010] // ff15???????? | // 898710904200 | mov dword ptr [edi + 0x429010], eax // 83c704 | add edi, 4 $sequence_30 = { e8???????? 8bf8 8d7508 885dfc } // n = 4, score = 100 // e8???????? | // 8bf8 | mov edi, eax // 8d7508 | lea esi, [ebp + 8] // 885dfc | mov byte ptr [ebp - 4], bl $sequence_31 = { ff15???????? 52 8945dc c70424f5ffffff ff15???????? 51 } // n = 6, score = 100 // ff15???????? | // 52 | push edx // 8945dc | mov dword ptr [ebp - 0x24], eax // c70424f5ffffff | mov dword ptr [esp], 0xfffffff5 // ff15???????? | // 51 | push ecx $sequence_32 = { c705????????27ec4000 c705????????10904100 c605????????01 c705????????68000000 c705????????d8c44100 c705????????83eb4000 } // n = 6, score = 100 // c705????????27ec4000 | // c705????????10904100 | // c605????????01 | // c705????????68000000 | // c705????????d8c44100 | // c705????????83eb4000 | $sequence_33 = { 8b1495c0a84200 c1e006 8d440224 802080 } // n = 4, score = 100 // 8b1495c0a84200 | mov edx, dword ptr [edx*4 + 0x42a8c0] // c1e006 | shl eax, 6 // 8d440224 | lea eax, [edx + eax + 0x24] // 802080 | and byte ptr [eax], 0x80 $sequence_34 = { 7402 8b17 39c2 7e1e 807c07083f 7517 } // n = 6, score = 100 // 7402 | je 4 // 8b17 | mov edx, dword ptr [edi] // 39c2 | cmp edx, eax // 7e1e | jle 0x20 // 807c07083f | cmp byte ptr [edi + eax + 8], 0x3f // 7517 | jne 0x19 $sequence_35 = { 5e 5f 5d c3 55 8d049502000000 } // n = 6, score = 100 // 5e | pop esi // 5f | pop edi // 5d | pop ebp // c3 | ret // 55 | push ebp // 8d049502000000 | lea eax, [edx*4 + 2] $sequence_36 = { 8b8d78f7ffff 51 e9???????? ff15???????? 83bd8cf7ffff10 e9???????? 83bd8cf7ffff10 } // n = 7, score = 100 // 8b8d78f7ffff | mov ecx, dword ptr [ebp - 0x888] // 51 | push ecx // e9???????? | // ff15???????? | // 83bd8cf7ffff10 | cmp dword ptr [ebp - 0x874], 0x10 // e9???????? | // 83bd8cf7ffff10 | cmp dword ptr [ebp - 0x874], 0x10 condition: 7 of them and filesize < 9453568 }
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