Actor(s): Operation C-Major
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rule win_andromeda_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2021-10-07" version = "1" description = "Detects win.andromeda." info = "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.andromeda" malpedia_rule_date = "20211007" malpedia_hash = "e5b790e0f888f252d49063a1251ca60ec2832535" malpedia_version = "20211008" 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 = { 8bec 81c400ffffff 60 b940000000 8d7dfc b8fcfdfeff fd } // n = 7, score = 800 // 8bec | mov ebp, esp // 81c400ffffff | add esp, 0xffffff00 // 60 | pushal // b940000000 | mov ecx, 0x40 // 8d7dfc | lea edi, dword ptr [ebp - 4] // b8fcfdfeff | mov eax, 0xfffefdfc // fd | std $sequence_1 = { 368ab42b00ffffff 3688b42800ffffff 3688942b00ffffff 02d6 81e2ff000000 368a942a00ffffff } // n = 6, score = 800 // 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 // 368a942a00ffffff | mov dl, byte ptr ss:[edx + ebp - 0x100] $sequence_2 = { 368a942800ffffff 02da 368ab42b00ffffff 3688b42800ffffff } // n = 4, 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 $sequence_3 = { 368ab42800ffffff 3688b42900ffffff 3688942800ffffff fec1 7408 } // n = 5, score = 800 // 368ab42800ffffff | mov dh, byte ptr ss:[eax + ebp - 0x100] // 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_4 = { e2f8 fc 33c0 8b7508 33db } // n = 5, score = 800 // e2f8 | loop 0xfffffffa // fc | cld // 33c0 | xor eax, eax // 8b7508 | mov esi, dword ptr [ebp + 8] // 33db | xor ebx, ebx $sequence_5 = { 8b7508 33db 368a942900ffffff 02c2 020433 } // n = 5, score = 800 // 8b7508 | mov esi, dword ptr [ebp + 8] // 33db | xor ebx, ebx // 368a942900ffffff | mov dl, byte ptr ss:[ecx + ebp - 0x100] // 02c2 | add al, dl // 020433 | add al, byte ptr [ebx + esi] $sequence_6 = { 43 3b5d0c 74cf ebcf 33c0 33db 33c9 } // n = 7, score = 800 // 43 | inc ebx // 3b5d0c | cmp ebx, dword ptr [ebp + 0xc] // 74cf | je 0xffffffd1 // ebcf | jmp 0xffffffd1 // 33c0 | xor eax, eax // 33db | xor ebx, ebx // 33c9 | xor ecx, ecx $sequence_7 = { 8b7d10 fec0 368a942800ffffff 02da } // n = 4, score = 800 // 8b7d10 | mov edi, dword ptr [ebp + 0x10] // fec0 | inc al // 368a942800ffffff | mov dl, byte ptr ss:[eax + ebp - 0x100] // 02da | add bl, dl $sequence_8 = { 60 e8???????? 5d 81ed???????? } // n = 4, score = 700 // 60 | pushal // e8???????? | // 5d | pop ebp // 81ed???????? | $sequence_9 = { 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_10 = { 0f9ec1 33d2 3c41 0f9dc2 85ca 7404 0420 } // n = 7, score = 400 // 0f9ec1 | setle cl // 33d2 | xor edx, edx // 3c41 | cmp al, 0x41 // 0f9dc2 | setge dl // 85ca | test edx, ecx // 7404 | je 6 // 0420 | add al, 0x20 $sequence_11 = { 8a06 33c9 3c5a 0f9ec1 33d2 3c41 } // n = 6, 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 $sequence_12 = { 6a30 8d45d0 50 6a01 ff7508 e8???????? } // n = 6, score = 400 // 6a30 | push 0x30 // 8d45d0 | lea eax, dword ptr [ebp - 0x30] // 50 | push eax // 6a01 | push 1 // ff7508 | push dword ptr [ebp + 8] // e8???????? | $sequence_13 = { 50 e8???????? 83c40c 6800000100 } // n = 4, score = 400 // 50 | push eax // e8???????? | // 83c40c | add esp, 0xc // 6800000100 | push 0x10000 $sequence_14 = { 8945d0 3bc7 0f84be000000 ff35???????? 68???????? 50 } // n = 6, score = 300 // 8945d0 | mov dword ptr [ebp - 0x30], eax // 3bc7 | cmp eax, edi // 0f84be000000 | je 0xc4 // ff35???????? | // 68???????? | // 50 | push eax $sequence_15 = { ff75e4 50 ff75f0 ff15???????? 8d45dc } // n = 5, score = 300 // ff75e4 | push dword ptr [ebp - 0x1c] // 50 | push eax // ff75f0 | push dword ptr [ebp - 0x10] // ff15???????? | // 8d45dc | lea eax, dword ptr [ebp - 0x24] $sequence_16 = { 6801000080 e8???????? 83f800 7526 ff75f8 e8???????? } // n = 6, score = 200 // 6801000080 | push 0x80000001 // e8???????? | // 83f800 | cmp eax, 0 // 7526 | jne 0x28 // ff75f8 | push dword ptr [ebp - 8] // e8???????? | $sequence_17 = { 68???????? e8???????? 6804010000 ff75fc 6a00 e8???????? } // n = 6, score = 200 // 68???????? | // e8???????? | // 6804010000 | push 0x104 // ff75fc | push dword ptr [ebp - 4] // 6a00 | push 0 // e8???????? | $sequence_18 = { 7479 6a10 8d45e0 50 ff75f0 } // n = 5, score = 200 // 7479 | je 0x7b // 6a10 | push 0x10 // 8d45e0 | lea eax, dword ptr [ebp - 0x20] // 50 | push eax // ff75f0 | push dword ptr [ebp - 0x10] $sequence_19 = { 6a06 6a01 6a02 e8???????? 8945f0 83f8ff } // n = 6, score = 200 // 6a06 | push 6 // 6a01 | push 1 // 6a02 | push 2 // e8???????? | // 8945f0 | mov dword ptr [ebp - 0x10], eax // 83f8ff | cmp eax, -1 $sequence_20 = { 6a00 ff35???????? e8???????? 8945f8 83f800 0f8458010000 6804010000 } // n = 7, score = 200 // 6a00 | push 0 // ff35???????? | // e8???????? | // 8945f8 | mov dword ptr [ebp - 8], eax // 83f800 | cmp eax, 0 // 0f8458010000 | je 0x15e // 6804010000 | push 0x104 $sequence_21 = { c745e400000000 6a00 6a00 6a00 6a06 6a01 6a02 } // n = 7, score = 200 // c745e400000000 | mov dword ptr [ebp - 0x1c], 0 // 6a00 | push 0 // 6a00 | push 0 // 6a00 | push 0 // 6a06 | push 6 // 6a01 | push 1 // 6a02 | push 2 $sequence_22 = { f3aa 6a00 6a00 ff75f0 e8???????? c7459c44000000 8945d4 } // n = 7, score = 200 // f3aa | rep stosb byte ptr es:[edi], al // 6a00 | push 0 // 6a00 | push 0 // ff75f0 | push dword ptr [ebp - 0x10] // e8???????? | // c7459c44000000 | mov dword ptr [ebp - 0x64], 0x44 // 8945d4 | mov dword ptr [ebp - 0x2c], eax $sequence_23 = { a3???????? 6804010000 6a00 ff35???????? e8???????? 8945fc 83f800 } // n = 7, score = 200 // a3???????? | // 6804010000 | push 0x104 // 6a00 | push 0 // ff35???????? | // e8???????? | // 8945fc | mov dword ptr [ebp - 4], eax // 83f800 | cmp eax, 0 $sequence_24 = { 8b4518 8d9c1decfeffff 8a0b 8d8405ecfeffff 8945f0 8808 } // n = 6, score = 100 // 8b4518 | mov eax, dword ptr [ebp + 0x18] // 8d9c1decfeffff | lea ebx, dword ptr [ebp + ebx - 0x114] // 8a0b | mov cl, byte ptr [ebx] // 8d8405ecfeffff | lea eax, dword ptr [ebp + eax - 0x114] // 8945f0 | mov dword ptr [ebp - 0x10], eax // 8808 | mov byte ptr [eax], cl $sequence_25 = { 6af5 89450c ff5630 23f8 e9???????? 8b45fc } // n = 6, score = 100 // 6af5 | push -0xb // 89450c | mov dword ptr [ebp + 0xc], eax // ff5630 | call dword ptr [esi + 0x30] // 23f8 | and edi, eax // e9???????? | // 8b45fc | mov eax, dword ptr [ebp - 4] $sequence_26 = { 69ff77f02186 81c6002a7b28 8945ec 3bc2 0f848d010000 8b4d08 014dec } // n = 7, score = 100 // 69ff77f02186 | imul edi, edi, 0x8621f077 // 81c6002a7b28 | add esi, 0x287b2a00 // 8945ec | mov dword ptr [ebp - 0x14], eax // 3bc2 | cmp eax, edx // 0f848d010000 | je 0x193 // 8b4d08 | mov ecx, dword ptr [ebp + 8] // 014dec | add dword ptr [ebp - 0x14], ecx $sequence_27 = { 8365f400 8bf8 ff5634 8b4d0c 81c951dbc951 } // n = 5, score = 100 // 8365f400 | and dword ptr [ebp - 0xc], 0 // 8bf8 | mov edi, eax // ff5634 | call dword ptr [esi + 0x34] // 8b4d0c | mov ecx, dword ptr [ebp + 0xc] // 81c951dbc951 | or ecx, 0x51c9db51 $sequence_28 = { 3b450c 740d ff45f4 ff560c } // n = 4, score = 100 // 3b450c | cmp eax, dword ptr [ebp + 0xc] // 740d | je 0xf // ff45f4 | inc dword ptr [ebp - 0xc] // ff560c | call dword ptr [esi + 0xc] $sequence_29 = { 83651800 81c39f3a1a00 81f7aadd7d3f 81fb2d60a634 74b1 e9???????? 8b5518 } // n = 7, score = 100 // 83651800 | and dword ptr [ebp + 0x18], 0 // 81c39f3a1a00 | add ebx, 0x1a3a9f // 81f7aadd7d3f | xor edi, 0x3f7dddaa // 81fb2d60a634 | cmp ebx, 0x34a6602d // 74b1 | je 0xffffffb3 // e9???????? | // 8b5518 | mov edx, dword ptr [ebp + 0x18] $sequence_30 = { 81c7fbbebe70 e8???????? 05???????? 50 ff7510 ff5644 e9???????? } // n = 7, score = 100 // 81c7fbbebe70 | add edi, 0x70bebefb // e8???????? | // 05???????? | // 50 | push eax // ff7510 | push dword ptr [ebp + 0x10] // ff5644 | call dword ptr [esi + 0x44] // e9???????? | $sequence_31 = { eb8d 837d1000 7417 ff75f8 ff7508 ff5510 81e723fc4c01 } // n = 7, score = 100 // eb8d | jmp 0xffffff8f // 837d1000 | cmp dword ptr [ebp + 0x10], 0 // 7417 | je 0x19 // ff75f8 | push dword ptr [ebp - 8] // ff7508 | push dword ptr [ebp + 8] // ff5510 | call dword ptr [ebp + 0x10] // 81e723fc4c01 | and edi, 0x14cfc23 condition: 7 of them and filesize < 204800 }
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