Actor(s): Operation C-Major
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rule win_andromeda_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.andromeda" malpedia_rule_date = "20200529" malpedia_hash = "92c362319514e5a6da26204961446caa3a8b32a8" malpedia_version = "20200529" malpedia_license = "CC BY-NC-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 = { e2f8 fc 33c0 8b7508 33db 368a942900ffffff } // n = 6, score = 800 // e2f8 | loop 0xfffffffa // fc | cld // 33c0 | xor eax, eax // 8b7508 | mov esi, dword ptr [ebp + 8] // 33db | xor ebx, ebx // 368a942900ffffff | mov dl, byte ptr ss:[ecx + ebp - 0x100] $sequence_1 = { fd ab 2d04040404 e2f8 fc 33c0 } // n = 6, score = 800 // fd | std // ab | stosd dword ptr es:[edi], eax // 2d04040404 | sub eax, 0x4040404 // e2f8 | loop 0xfffffffa // fc | cld // 33c0 | xor eax, eax $sequence_2 = { b940000000 8d7dfc b8fcfdfeff fd } // n = 4, score = 800 // b940000000 | mov ecx, 0x40 // 8d7dfc | lea edi, [ebp - 4] // b8fcfdfeff | mov eax, 0xfffefdfc // fd | std $sequence_3 = { 41 3b4d14 75c3 61 } // n = 4, score = 800 // 41 | inc ecx // 3b4d14 | cmp ecx, dword ptr [ebp + 0x14] // 75c3 | jne 0xffffffc5 // 61 | popal $sequence_4 = { 368a942800ffffff 02da 368ab42b00ffffff 3688b42800ffffff 3688942b00ffffff 02d6 81e2ff000000 } // n = 7, score = 800 // 368a942800ffffff | mov dl, byte ptr ss:[eax + ebp - 0x100] // 02da | add bl, dl // 368ab42b00ffffff | mov dh, byte ptr ss:[ebx + ebp - 0x100] // 3688b42800ffffff | mov byte ptr ss:[eax + ebp - 0x100], dh // 3688942b00ffffff | mov byte ptr ss:[ebx + ebp - 0x100], dl // 02d6 | add dl, dh // 81e2ff000000 | and edx, 0xff $sequence_5 = { 3688b42900ffffff 3688942800ffffff fec1 7408 } // n = 4, score = 800 // 3688b42900ffffff | mov byte ptr ss:[ecx + ebp - 0x100], dh // 3688942800ffffff | mov byte ptr ss:[eax + ebp - 0x100], dl // fec1 | inc cl // 7408 | je 0xa $sequence_6 = { 55 8bec 81c400ffffff 60 } // n = 4, score = 800 // 55 | push ebp // 8bec | mov ebp, esp // 81c400ffffff | add esp, 0xffffff00 // 60 | pushal $sequence_7 = { fec1 7408 43 3b5d0c 74cf ebcf 33c0 } // n = 7, score = 800 // fec1 | inc cl // 7408 | je 0xa // 43 | inc ebx // 3b5d0c | cmp ebx, dword ptr [ebp + 0xc] // 74cf | je 0xffffffd1 // ebcf | jmp 0xffffffd1 // 33c0 | xor eax, eax $sequence_8 = { 60 e8???????? 5d 81ed???????? } // n = 4, score = 700 // 60 | pushal // e8???????? | // 5d | pop ebp // 81ed???????? | $sequence_9 = { 6a30 8d45d0 50 6a01 } // n = 4, score = 400 // 6a30 | push 0x30 // 8d45d0 | lea eax, [ebp - 0x30] // 50 | push eax // 6a01 | push 1 $sequence_10 = { 0fb64601 84c0 7905 0d00ffffff } // n = 4, score = 400 // 0fb64601 | movzx eax, byte ptr [esi + 1] // 84c0 | test al, al // 7905 | jns 7 // 0d00ffffff | or eax, 0xffffff00 $sequence_11 = { 8a06 33c9 3c5a 0f9ec1 33d2 3c41 0f9dc2 } // n = 7, score = 400 // 8a06 | mov al, byte ptr [esi] // 33c9 | xor ecx, ecx // 3c5a | cmp al, 0x5a // 0f9ec1 | setle cl // 33d2 | xor edx, edx // 3c41 | cmp al, 0x41 // 0f9dc2 | setge dl $sequence_12 = { 50 e8???????? 83c40c 6800000100 e8???????? } // n = 5, score = 400 // 50 | push eax // e8???????? | // 83c40c | add esp, 0xc // 6800000100 | push 0x10000 // e8???????? | $sequence_13 = { 0f9dc2 85ca 7404 0420 8806 } // n = 5, score = 400 // 0f9dc2 | setge dl // 85ca | test edx, ecx // 7404 | je 6 // 0420 | add al, 0x20 // 8806 | mov byte ptr [esi], al $sequence_14 = { ff75e4 8b35???????? ffd6 ff75e0 ffd6 53 } // n = 6, score = 300 // ff75e4 | push dword ptr [ebp - 0x1c] // 8b35???????? | // ffd6 | call esi // ff75e0 | push dword ptr [ebp - 0x20] // ffd6 | call esi // 53 | push ebx $sequence_15 = { 7423 6810270000 ff75f4 ff15???????? ff75f4 8945f8 } // n = 6, score = 300 // 7423 | je 0x25 // 6810270000 | push 0x2710 // ff75f4 | push dword ptr [ebp - 0xc] // ff15???????? | // ff75f4 | push dword ptr [ebp - 0xc] // 8945f8 | mov dword ptr [ebp - 8], eax $sequence_16 = { e8???????? a3???????? 6804010000 6a00 ff35???????? e8???????? 8945fc } // n = 7, score = 200 // e8???????? | // a3???????? | // 6804010000 | push 0x104 // 6a00 | push 0 // ff35???????? | // e8???????? | // 8945fc | mov dword ptr [ebp - 4], eax $sequence_17 = { 668945e2 c745e400000000 6a00 6a00 } // n = 4, score = 200 // 668945e2 | mov word ptr [ebp - 0x1e], ax // c745e400000000 | mov dword ptr [ebp - 0x1c], 0 // 6a00 | push 0 // 6a00 | push 0 $sequence_18 = { 6a00 6a00 68???????? 6a00 e8???????? eba9 } // n = 6, score = 200 // 6a00 | push 0 // 6a00 | push 0 // 68???????? | // 6a00 | push 0 // e8???????? | // eba9 | jmp 0xffffffab $sequence_19 = { 6a00 6a00 ff75f0 e8???????? c7459c44000000 } // n = 5, score = 200 // 6a00 | push 0 // 6a00 | push 0 // ff75f0 | push dword ptr [ebp - 0x10] // e8???????? | // c7459c44000000 | mov dword ptr [ebp - 0x64], 0x44 $sequence_20 = { ff75fc e8???????? 6a06 ff75f8 e8???????? } // n = 5, score = 200 // ff75fc | push dword ptr [ebp - 4] // e8???????? | // 6a06 | push 6 // ff75f8 | push dword ptr [ebp - 8] // e8???????? | $sequence_21 = { c745c801010000 8d458c 50 8d459c 50 6a00 6a00 } // n = 7, score = 200 // c745c801010000 | mov dword ptr [ebp - 0x38], 0x101 // 8d458c | lea eax, [ebp - 0x74] // 50 | push eax // 8d459c | lea eax, [ebp - 0x64] // 50 | push eax // 6a00 | push 0 // 6a00 | push 0 $sequence_22 = { 68???????? 6801010000 e8???????? 66c745e00200 68401f0000 e8???????? 668945e2 } // n = 7, score = 200 // 68???????? | // 6801010000 | push 0x101 // e8???????? | // 66c745e00200 | mov word ptr [ebp - 0x20], 2 // 68401f0000 | push 0x1f40 // e8???????? | // 668945e2 | mov word ptr [ebp - 0x1e], ax $sequence_23 = { 7526 ff75f8 e8???????? 40 50 ff75f8 6a01 } // n = 7, score = 200 // 7526 | jne 0x28 // ff75f8 | push dword ptr [ebp - 8] // e8???????? | // 40 | inc eax // 50 | push eax // ff75f8 | push dword ptr [ebp - 8] // 6a01 | push 1 $sequence_24 = { 8b45ec 8b55fc 8b0490 81f683073af8 81e7d889e666 8945f8 } // n = 6, score = 100 // 8b45ec | mov eax, dword ptr [ebp - 0x14] // 8b55fc | mov edx, dword ptr [ebp - 4] // 8b0490 | mov eax, dword ptr [eax + edx*4] // 81f683073af8 | xor esi, 0xf83a0783 // 81e7d889e666 | and edi, 0x66e689d8 // 8945f8 | mov dword ptr [ebp - 8], eax $sequence_25 = { 81f3101a664b 23f8 81fbb13a759a 743b 8b4508 0145f8 } // n = 6, score = 100 // 81f3101a664b | xor ebx, 0x4b661a10 // 23f8 | and edi, eax // 81fbb13a759a | cmp ebx, 0x9a753ab1 // 743b | je 0x3d // 8b4508 | mov eax, dword ptr [ebp + 8] // 0145f8 | add dword ptr [ebp - 8], eax $sequence_26 = { 81e968609267 81faff69544f 74ec e9???????? 8bda } // n = 5, score = 100 // 81e968609267 | sub ecx, 0x67926068 // 81faff69544f | cmp edx, 0x4f5469ff // 74ec | je 0xffffffee // e9???????? | // 8bda | mov ebx, edx $sequence_27 = { 74a8 e8???????? 05???????? 50 ff7510 ff5644 } // n = 6, score = 100 // 74a8 | je 0xffffffaa // e8???????? | // 05???????? | // 50 | push eax // ff7510 | push dword ptr [ebp + 0x10] // ff5644 | call dword ptr [esi + 0x44] $sequence_28 = { 7456 85c0 7509 394510 0f840c010000 } // n = 5, score = 100 // 7456 | je 0x58 // 85c0 | test eax, eax // 7509 | jne 0xb // 394510 | cmp dword ptr [ebp + 0x10], eax // 0f840c010000 | je 0x112 $sequence_29 = { 8945f8 81c727a0f047 ff560c 03d8 837df800 0f842dffffff 83651800 } // n = 7, score = 100 // 8945f8 | mov dword ptr [ebp - 8], eax // 81c727a0f047 | add edi, 0x47f0a027 // ff560c | call dword ptr [esi + 0xc] // 03d8 | add ebx, eax // 837df800 | cmp dword ptr [ebp - 8], 0 // 0f842dffffff | je 0xffffff33 // 83651800 | and dword ptr [ebp + 0x18], 0 $sequence_30 = { 81fb37355e10 0f856afeffff e9???????? 55 8bec 83ec24 } // n = 6, score = 100 // 81fb37355e10 | cmp ebx, 0x105e3537 // 0f856afeffff | jne 0xfffffe70 // e9???????? | // 55 | push ebp // 8bec | mov ebp, esp // 83ec24 | sub esp, 0x24 $sequence_31 = { 81ff8a1e4c63 74d5 33d2 3bc2 0f84e8010000 8b45e4 } // n = 6, score = 100 // 81ff8a1e4c63 | cmp edi, 0x634c1e8a // 74d5 | je 0xffffffd7 // 33d2 | xor edx, edx // 3bc2 | cmp eax, edx // 0f84e8010000 | je 0x1ee // 8b45e4 | mov eax, dword ptr [ebp - 0x1c] condition: 7 of them and filesize < 204800 }
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