Actor(s): Operation C-Major
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rule win_andromeda_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2026-09-17" 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 = "20260916" malpedia_hash = "53a643781c18e08f4a50949af60172d837a0b6f6" malpedia_version = "20260917" 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 = { b8fcfdfeff fd ab 2d04040404 } // n = 4, score = 800 // b8fcfdfeff | mov eax, 0xfffefdfc // fd | std // ab | stosd dword ptr es:[edi], eax // 2d04040404 | sub eax, 0x4040404 $sequence_1 = { 33c9 33d2 8b7d10 fec0 368a942800ffffff } // n = 5, score = 800 // 33c9 | xor ecx, ecx // 33d2 | xor edx, edx // 8b7d10 | mov edi, dword ptr [ebp + 0x10] // fec0 | inc al // 368a942800ffffff | mov dl, byte ptr ss:[eax + ebp - 0x100] $sequence_2 = { 81e2ff000000 368a942a00ffffff 301439 41 3b4d14 } // n = 5, score = 800 // 81e2ff000000 | and edx, 0xff // 368a942a00ffffff | mov dl, byte ptr ss:[edx + ebp - 0x100] // 301439 | xor byte ptr [ecx + edi], dl // 41 | inc ecx // 3b4d14 | cmp ecx, dword ptr [ebp + 0x14] $sequence_3 = { 8b7508 33db 368a942900ffffff 02c2 020433 368ab42800ffffff } // n = 6, 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] // 368ab42800ffffff | mov dh, byte ptr ss:[eax + ebp - 0x100] $sequence_4 = { ebcf 33c0 33db 33c9 } // n = 4, score = 800 // ebcf | jmp 0xffffffd1 // 33c0 | xor eax, eax // 33db | xor ebx, ebx // 33c9 | xor ecx, ecx $sequence_5 = { 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_6 = { 60 b940000000 8d7dfc b8fcfdfeff fd } // n = 5, score = 800 // 60 | pushal // b940000000 | mov ecx, 0x40 // 8d7dfc | lea edi, [ebp - 4] // b8fcfdfeff | mov eax, 0xfffefdfc // fd | std $sequence_7 = { 3688942b00ffffff 02d6 81e2ff000000 368a942a00ffffff } // n = 4, score = 800 // 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_8 = { 60 e8???????? 5d 81ed???????? 33c9 } // n = 5, score = 700 // 60 | pushal // e8???????? | // 5d | pop ebp // 81ed???????? | // 33c9 | xor ecx, ecx $sequence_9 = { 50 e8???????? 83c40c 6800000100 e8???????? } // n = 5, score = 400 // 50 | push eax // e8???????? | // 83c40c | add esp, 0xc // 6800000100 | push 0x10000 // e8???????? | $sequence_10 = { 85ca 7404 0420 8806 } // n = 4, score = 400 // 85ca | test edx, ecx // 7404 | je 6 // 0420 | add al, 0x20 // 8806 | mov byte ptr [esi], al $sequence_11 = { 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_12 = { 6a00 6a30 8d45d0 50 6a01 ff7508 } // n = 6, score = 400 // 6a00 | push 0 // 6a30 | push 0x30 // 8d45d0 | lea eax, [ebp - 0x30] // 50 | push eax // 6a01 | push 1 // ff7508 | push dword ptr [ebp + 8] $sequence_13 = { 33d2 3c41 0f9dc2 85ca 7404 } // n = 5, score = 400 // 33d2 | xor edx, edx // 3c41 | cmp al, 0x41 // 0f9dc2 | setge dl // 85ca | test edx, ecx // 7404 | je 6 $sequence_14 = { 8a06 33c9 3c5a 0f9ec1 } // n = 4, score = 400 // 8a06 | mov al, byte ptr [esi] // 33c9 | xor ecx, ecx // 3c5a | cmp al, 0x5a // 0f9ec1 | setle cl $sequence_15 = { 85c0 741c ff7508 6a04 ff750c ff15???????? 85c0 } // n = 7, score = 300 // 85c0 | test eax, eax // 741c | je 0x1e // ff7508 | push dword ptr [ebp + 8] // 6a04 | push 4 // ff750c | push dword ptr [ebp + 0xc] // ff15???????? | // 85c0 | test eax, eax $sequence_16 = { 6a00 6a06 6a01 6a02 e8???????? 8945f0 83f8ff } // n = 7, score = 200 // 6a00 | push 0 // 6a06 | push 6 // 6a01 | push 1 // 6a02 | push 2 // e8???????? | // 8945f0 | mov dword ptr [ebp - 0x10], eax // 83f8ff | cmp eax, -1 $sequence_17 = { 0f8476010000 6804010000 6a00 ff35???????? e8???????? 8945f8 } // n = 6, score = 200 // 0f8476010000 | je 0x17c // 6804010000 | push 0x104 // 6a00 | push 0 // ff35???????? | // e8???????? | // 8945f8 | mov dword ptr [ebp - 8], eax $sequence_18 = { 8945d8 8945dc 66c745cc0000 c745c801010000 8d458c } // n = 5, score = 200 // 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 = { 6a00 6a00 68???????? 6a00 e8???????? eba9 6a00 } // n = 7, score = 200 // 6a00 | push 0 // 6a00 | push 0 // 68???????? | // 6a00 | push 0 // e8???????? | // eba9 | jmp 0xffffffab // 6a00 | push 0 $sequence_20 = { 83f800 0f8458010000 6804010000 ff75f8 68???????? e8???????? } // n = 6, score = 200 // 83f800 | cmp eax, 0 // 0f8458010000 | je 0x15e // 6804010000 | push 0x104 // ff75f8 | push dword ptr [ebp - 8] // 68???????? | // e8???????? | $sequence_21 = { 6a10 8d45e0 50 ff75f0 e8???????? } // n = 5, score = 200 // 6a10 | push 0x10 // 8d45e0 | lea eax, [ebp - 0x20] // 50 | push eax // ff75f0 | push dword ptr [ebp - 0x10] // e8???????? | $sequence_22 = { c745e400000000 6a00 6a00 6a00 6a06 } // n = 5, score = 200 // c745e400000000 | mov dword ptr [ebp - 0x1c], 0 // 6a00 | push 0 // 6a00 | push 0 // 6a00 | push 0 // 6a06 | push 6 $sequence_23 = { e8???????? 6804010000 ff75fc 6a00 } // n = 4, score = 200 // e8???????? | // 6804010000 | push 0x104 // ff75fc | push dword ptr [ebp - 4] // 6a00 | push 0 $sequence_24 = { 81f71b1ccc93 81f3db50ed3e 8945ec 81ff7185baee } // n = 4, score = 100 // 81f71b1ccc93 | xor edi, 0x93cc1c1b // 81f3db50ed3e | xor ebx, 0x3eed50db // 8945ec | mov dword ptr [ebp - 0x14], eax // 81ff7185baee | cmp edi, 0xeeba8571 $sequence_25 = { 894574 81e736087c03 8d45e0 69ffcd16011d } // n = 4, score = 100 // 894574 | mov dword ptr [ebp + 0x74], eax // 81e736087c03 | and edi, 0x37c0836 // 8d45e0 | lea eax, [ebp - 0x20] // 69ffcd16011d | imul edi, edi, 0x1d0116cd $sequence_26 = { 8b4d08 8bd8 8b413c 81f3466f8be1 81c7462448a5 } // n = 5, score = 100 // 8b4d08 | mov ecx, dword ptr [ebp + 8] // 8bd8 | mov ebx, eax // 8b413c | mov eax, dword ptr [ecx + 0x3c] // 81f3466f8be1 | xor ebx, 0xe18b6f46 // 81c7462448a5 | add edi, 0xa5482446 $sequence_27 = { ff560c 0fafc7 89450c 8b45f0 } // n = 4, score = 100 // ff560c | call dword ptr [esi + 0xc] // 0fafc7 | imul eax, edi // 89450c | mov dword ptr [ebp + 0xc], eax // 8b45f0 | mov eax, dword ptr [ebp - 0x10] $sequence_28 = { 8d4de0 51 ff75d4 35ebb0598f 50 ff75cc e8???????? } // n = 7, score = 100 // 8d4de0 | lea ecx, [ebp - 0x20] // 51 | push ecx // ff75d4 | push dword ptr [ebp - 0x2c] // 35ebb0598f | xor eax, 0x8f59b0eb // 50 | push eax // ff75cc | push dword ptr [ebp - 0x34] // e8???????? | $sequence_29 = { 81fffc199d56 0f848efbffff 8b4564 2b4550 83e805 } // n = 5, score = 100 // 81fffc199d56 | cmp edi, 0x569d19fc // 0f848efbffff | je 0xfffffb94 // 8b4564 | mov eax, dword ptr [ebp + 0x64] // 2b4550 | sub eax, dword ptr [ebp + 0x50] // 83e805 | sub eax, 5 $sequence_30 = { 81f1ceda243f 81eace7c3816 8b5d08 8a1c1f 84db } // n = 5, score = 100 // 81f1ceda243f | xor ecx, 0x3f24dace // 81eace7c3816 | sub edx, 0x16387cce // 8b5d08 | mov ebx, dword ptr [ebp + 8] // 8a1c1f | mov bl, byte ptr [edi + ebx] // 84db | test bl, bl $sequence_31 = { 8d45dc 50 ff75f4 c745dc5c002a00 ff5644 } // n = 5, score = 100 // 8d45dc | lea eax, [ebp - 0x24] // 50 | push eax // ff75f4 | push dword ptr [ebp - 0xc] // c745dc5c002a00 | mov dword ptr [ebp - 0x24], 0x2a005c // ff5644 | call dword ptr [esi + 0x44] condition: 7 of them and filesize < 204800 }
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