Actor(s): Operation C-Major
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rule win_andromeda_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2026-01-05" 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 = "20260105" malpedia_hash = "19b79e7cab4eaf532122e5b45a77dd8f6bb5cc79" malpedia_version = "20251219" 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 = { 02d6 81e2ff000000 368a942a00ffffff 301439 41 } // n = 5, score = 800 // 02d6 | add dl, dh // 81e2ff000000 | and edx, 0xff // 368a942a00ffffff | mov dl, byte ptr ss:[edx + ebp - 0x100] // 301439 | xor byte ptr [ecx + edi], dl // 41 | inc ecx $sequence_1 = { 8b7508 33db 368a942900ffffff 02c2 } // n = 4, 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 $sequence_2 = { 7408 43 3b5d0c 74cf ebcf 33c0 } // n = 6, score = 800 // 7408 | je 0xa // 43 | inc ebx // 3b5d0c | cmp ebx, dword ptr [ebp + 0xc] // 74cf | je 0xffffffd1 // ebcf | jmp 0xffffffd1 // 33c0 | xor eax, eax $sequence_3 = { 55 8bec 81c400ffffff 60 b940000000 8d7dfc b8fcfdfeff } // n = 7, score = 800 // 55 | push ebp // 8bec | mov ebp, esp // 81c400ffffff | add esp, 0xffffff00 // 60 | pushal // b940000000 | mov ecx, 0x40 // 8d7dfc | lea edi, [ebp - 4] // b8fcfdfeff | mov eax, 0xfffefdfc $sequence_4 = { fec0 368a942800ffffff 02da 368ab42b00ffffff 3688b42800ffffff 3688942b00ffffff 02d6 } // n = 7, score = 800 // fec0 | inc al // 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 $sequence_5 = { e2f8 fc 33c0 8b7508 } // n = 4, score = 800 // e2f8 | loop 0xfffffffa // fc | cld // 33c0 | xor eax, eax // 8b7508 | mov esi, dword ptr [ebp + 8] $sequence_6 = { 368ab42800ffffff 3688b42900ffffff 3688942800ffffff fec1 } // n = 4, 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 $sequence_7 = { 8d7dfc b8fcfdfeff fd ab 2d04040404 e2f8 } // n = 6, score = 800 // 8d7dfc | lea edi, [ebp - 4] // b8fcfdfeff | mov eax, 0xfffefdfc // fd | std // ab | stosd dword ptr es:[edi], eax // 2d04040404 | sub eax, 0x4040404 // e2f8 | loop 0xfffffffa $sequence_8 = { 60 e8???????? 5d 81ed???????? 33c9 } // n = 5, score = 700 // 60 | pushal // e8???????? | // 5d | pop ebp // 81ed???????? | // 33c9 | xor ecx, ecx $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 = { 8d45d0 50 6a01 ff7508 } // n = 4, score = 400 // 8d45d0 | lea eax, [ebp - 0x30] // 50 | push eax // 6a01 | push 1 // ff7508 | push dword ptr [ebp + 8] $sequence_13 = { 50 e8???????? 83c40c 6800000100 e8???????? } // n = 5, score = 400 // 50 | push eax // e8???????? | // 83c40c | add esp, 0xc // 6800000100 | push 0x10000 // e8???????? | $sequence_14 = { 68???????? 50 ff15???????? 83c40c 56 6880000000 } // n = 6, score = 300 // 68???????? | // 50 | push eax // ff15???????? | // 83c40c | add esp, 0xc // 56 | push esi // 6880000000 | push 0x80 $sequence_15 = { 689f010000 6811010000 57 68???????? ff15???????? 50 } // n = 6, score = 300 // 689f010000 | push 0x19f // 6811010000 | push 0x111 // 57 | push edi // 68???????? | // ff15???????? | // 50 | push eax $sequence_16 = { 68401f0000 e8???????? 668945e2 c745e400000000 } // n = 4, score = 200 // 68401f0000 | push 0x1f40 // e8???????? | // 668945e2 | mov word ptr [ebp - 0x1e], ax // c745e400000000 | mov dword ptr [ebp - 0x1c], 0 $sequence_17 = { 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_18 = { c7459c44000000 8945d4 8945d8 8945dc 66c745cc0000 c745c801010000 8d458c } // n = 7, score = 200 // c7459c44000000 | mov dword ptr [ebp - 0x64], 0x44 // 8945d4 | mov dword ptr [ebp - 0x2c], eax // 8945d8 | mov dword ptr [ebp - 0x28], eax // 8945dc | mov dword ptr [ebp - 0x24], eax // 66c745cc0000 | mov word ptr [ebp - 0x34], 0 // c745c801010000 | mov dword ptr [ebp - 0x38], 0x101 // 8d458c | lea eax, [ebp - 0x74] $sequence_19 = { 7457 33c0 8d7d9c b944000000 f3aa 6a00 6a00 } // n = 7, score = 200 // 7457 | je 0x59 // 33c0 | xor eax, eax // 8d7d9c | lea edi, [ebp - 0x64] // b944000000 | mov ecx, 0x44 // f3aa | rep stosb byte ptr es:[edi], al // 6a00 | push 0 // 6a00 | push 0 $sequence_20 = { e8???????? ff75f4 e8???????? 68???????? 6801010000 e8???????? } // n = 6, score = 200 // e8???????? | // ff75f4 | push dword ptr [ebp - 0xc] // e8???????? | // 68???????? | // 6801010000 | push 0x101 // e8???????? | $sequence_21 = { 6a02 e8???????? 8945f0 83f8ff 7479 } // n = 5, score = 200 // 6a02 | push 2 // e8???????? | // 8945f0 | mov dword ptr [ebp - 0x10], eax // 83f8ff | cmp eax, -1 // 7479 | je 0x7b $sequence_22 = { e8???????? 8945f8 83f800 0f8458010000 } // n = 4, score = 200 // e8???????? | // 8945f8 | mov dword ptr [ebp - 8], eax // 83f800 | cmp eax, 0 // 0f8458010000 | je 0x15e $sequence_23 = { 6804010000 ff75fc 6a00 e8???????? 6a00 ff75f8 } // n = 6, score = 200 // 6804010000 | push 0x104 // ff75fc | push dword ptr [ebp - 4] // 6a00 | push 0 // e8???????? | // 6a00 | push 0 // ff75f8 | push dword ptr [ebp - 8] $sequence_24 = { 81fb5267a723 0f843fffffff 56 ff7514 } // n = 4, score = 100 // 81fb5267a723 | cmp ebx, 0x23a76752 // 0f843fffffff | je 0xffffff45 // 56 | push esi // ff7514 | push dword ptr [ebp + 0x14] $sequence_25 = { 0faff8 69f677adcc8a 81ffd02eaced 0f84a1feffff e9???????? 803beb } // n = 6, score = 100 // 0faff8 | imul edi, eax // 69f677adcc8a | imul esi, esi, 0x8accad77 // 81ffd02eaced | cmp edi, 0xedac2ed0 // 0f84a1feffff | je 0xfffffea7 // e9???????? | // 803beb | cmp byte ptr [ebx], 0xeb $sequence_26 = { 81e604002402 81e747af3c96 81ce00008000 81c760345938 } // n = 4, score = 100 // 81e604002402 | and esi, 0x2240004 // 81e747af3c96 | and edi, 0x963caf47 // 81ce00008000 | or esi, 0x800000 // 81c760345938 | add edi, 0x38593460 $sequence_27 = { 8b4574 833800 0f846c010000 6af5 ff5510 } // n = 5, score = 100 // 8b4574 | mov eax, dword ptr [ebp + 0x74] // 833800 | cmp dword ptr [eax], 0 // 0f846c010000 | je 0x172 // 6af5 | push -0xb // ff5510 | call dword ptr [ebp + 0x10] $sequence_28 = { ff5614 8bd8 81f392be3437 81ff64e62722 0f8418010000 8365f000 6850020000 } // n = 7, score = 100 // ff5614 | call dword ptr [esi + 0x14] // 8bd8 | mov ebx, eax // 81f392be3437 | xor ebx, 0x3734be92 // 81ff64e62722 | cmp edi, 0x2227e664 // 0f8418010000 | je 0x11e // 8365f000 | and dword ptr [ebp - 0x10], 0 // 6850020000 | push 0x250 $sequence_29 = { ff5638 314508 ff560c 8b7d04 0bd8 81fbb599839e 7503 } // n = 7, score = 100 // ff5638 | call dword ptr [esi + 0x38] // 314508 | xor dword ptr [ebp + 8], eax // ff560c | call dword ptr [esi + 0xc] // 8b7d04 | mov edi, dword ptr [ebp + 4] // 0bd8 | or ebx, eax // 81fbb599839e | cmp ebx, 0x9e8399b5 // 7503 | jne 5 $sequence_30 = { 81f99cd8b976 7417 85db 7c73 } // n = 4, score = 100 // 81f99cd8b976 | cmp ecx, 0x76b9d89c // 7417 | je 0x19 // 85db | test ebx, ebx // 7c73 | jl 0x75 $sequence_31 = { ff5518 33f8 81f6acec75ce 81ff45ee1de6 0f84ce000000 837d4800 } // n = 6, score = 100 // ff5518 | call dword ptr [ebp + 0x18] // 33f8 | xor edi, eax // 81f6acec75ce | xor esi, 0xce75ecac // 81ff45ee1de6 | cmp edi, 0xe61dee45 // 0f84ce000000 | je 0xd4 // 837d4800 | cmp dword ptr [ebp + 0x48], 0 condition: 7 of them and filesize < 204800 }
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