Actor(s): Operation C-Major
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rule win_andromeda_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2026-05-04" 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 = "20260422" malpedia_hash = "a182e35da64e6d71cb55f125c4d4225196523f14" malpedia_version = "20260504" 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 = { 3b5d0c 74cf ebcf 33c0 33db } // n = 5, score = 800 // 3b5d0c | cmp ebx, dword ptr [ebp + 0xc] // 74cf | je 0xffffffd1 // ebcf | jmp 0xffffffd1 // 33c0 | xor eax, eax // 33db | xor ebx, ebx $sequence_1 = { 3688b42800ffffff 3688942b00ffffff 02d6 81e2ff000000 368a942a00ffffff 301439 41 } // n = 7, score = 800 // 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] // 301439 | xor byte ptr [ecx + edi], dl // 41 | inc ecx $sequence_2 = { 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, [ebp - 4] // b8fcfdfeff | mov eax, 0xfffefdfc // fd | std $sequence_3 = { 8b7d10 fec0 368a942800ffffff 02da 368ab42b00ffffff 3688b42800ffffff } // n = 6, 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 // 368ab42b00ffffff | mov dh, byte ptr ss:[ebx + ebp - 0x100] // 3688b42800ffffff | mov byte ptr ss:[eax + ebp - 0x100], dh $sequence_4 = { 41 3b4d14 75c3 61 } // n = 4, score = 800 // 41 | inc ecx // 3b4d14 | cmp ecx, dword ptr [ebp + 0x14] // 75c3 | jne 0xffffffc5 // 61 | popal $sequence_5 = { 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_6 = { b8fcfdfeff fd ab 2d04040404 e2f8 fc 33c0 } // n = 7, score = 800 // b8fcfdfeff | mov eax, 0xfffefdfc // fd | std // ab | stosd dword ptr es:[edi], eax // 2d04040404 | sub eax, 0x4040404 // e2f8 | loop 0xfffffffa // fc | cld // 33c0 | xor eax, eax $sequence_7 = { 020433 368ab42800ffffff 3688b42900ffffff 3688942800ffffff fec1 7408 43 } // n = 7, score = 800 // 020433 | add al, byte ptr [ebx + esi] // 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 // 43 | inc ebx $sequence_8 = { 60 e8???????? 5d 81ed???????? } // n = 4, score = 700 // 60 | pushal // e8???????? | // 5d | pop ebp // 81ed???????? | $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 = { 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_11 = { 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_12 = { 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_13 = { 33d2 3c41 0f9dc2 85ca 7404 0420 8806 } // n = 7, score = 400 // 33d2 | xor edx, edx // 3c41 | cmp al, 0x41 // 0f9dc2 | setge dl // 85ca | test edx, ecx // 7404 | je 6 // 0420 | add al, 0x20 // 8806 | mov byte ptr [esi], al $sequence_14 = { 56 ff7508 c745f805000000 c745fc40000000 e8???????? } // n = 5, score = 300 // 56 | push esi // ff7508 | push dword ptr [ebp + 8] // c745f805000000 | mov dword ptr [ebp - 8], 5 // c745fc40000000 | mov dword ptr [ebp - 4], 0x40 // e8???????? | $sequence_15 = { 6a02 ffd3 6a32 ffd6 57 57 } // n = 6, score = 300 // 6a02 | push 2 // ffd3 | call ebx // 6a32 | push 0x32 // ffd6 | call esi // 57 | push edi // 57 | push edi $sequence_16 = { 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_17 = { 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_18 = { 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_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 = { 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_21 = { 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_22 = { 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_23 = { e8???????? 6804010000 ff75fc 6a00 } // n = 4, score = 200 // e8???????? | // 6804010000 | push 0x104 // ff75fc | push dword ptr [ebp - 4] // 6a00 | push 0 $sequence_24 = { 83656000 ff560c 0fafd8 ff5638 33f8 81ffb19e42da } // n = 6, score = 100 // 83656000 | and dword ptr [ebp + 0x60], 0 // ff560c | call dword ptr [esi + 0xc] // 0fafd8 | imul ebx, eax // ff5638 | call dword ptr [esi + 0x38] // 33f8 | xor edi, eax // 81ffb19e42da | cmp edi, 0xda429eb1 $sequence_25 = { 81ef21181d2d 81c6daf05740 894568 8b4568 81efe681e610 81ce9e5aef4c } // n = 6, score = 100 // 81ef21181d2d | sub edi, 0x2d1d1821 // 81c6daf05740 | add esi, 0x4057f0da // 894568 | mov dword ptr [ebp + 0x68], eax // 8b4568 | mov eax, dword ptr [ebp + 0x68] // 81efe681e610 | sub edi, 0x10e681e6 // 81ce9e5aef4c | or esi, 0x4cef5a9e $sequence_26 = { 0f859c000000 81f639913fa9 81e7ca3b0a91 81fe12cdd543 0f84d6fdffff 8d45e0 50 } // n = 7, score = 100 // 0f859c000000 | jne 0xa2 // 81f639913fa9 | xor esi, 0xa93f9139 // 81e7ca3b0a91 | and edi, 0x910a3bca // 81fe12cdd543 | cmp esi, 0x43d5cd12 // 0f84d6fdffff | je 0xfffffddc // 8d45e0 | lea eax, [ebp - 0x20] // 50 | push eax $sequence_27 = { 0bf8 81f66cfd417a 81ff6ef42c67 0f84ec070000 } // n = 4, score = 100 // 0bf8 | or edi, eax // 81f66cfd417a | xor esi, 0x7a41fd6c // 81ff6ef42c67 | cmp edi, 0x672cf46e // 0f84ec070000 | je 0x7f2 $sequence_28 = { ff75d4 35ebb0598f 50 ff75cc e8???????? } // n = 5, score = 100 // ff75d4 | push dword ptr [ebp - 0x2c] // 35ebb0598f | xor eax, 0x8f59b0eb // 50 | push eax // ff75cc | push dword ptr [ebp - 0x34] // e8???????? | $sequence_29 = { 64a130000000 89456c ff5634 2bd8 81ef54666d24 81fb0965812b 0f8406010000 } // n = 7, score = 100 // 64a130000000 | mov eax, dword ptr fs:[0x30] // 89456c | mov dword ptr [ebp + 0x6c], eax // ff5634 | call dword ptr [esi + 0x34] // 2bd8 | sub ebx, eax // 81ef54666d24 | sub edi, 0x246d6654 // 81fb0965812b | cmp ebx, 0x2b816509 // 0f8406010000 | je 0x10c $sequence_30 = { ff5630 2bd8 8b4558 81cf23aceabc 39456c 7519 8bc7 } // n = 7, score = 100 // ff5630 | call dword ptr [esi + 0x30] // 2bd8 | sub ebx, eax // 8b4558 | mov eax, dword ptr [ebp + 0x58] // 81cf23aceabc | or edi, 0xbceaac23 // 39456c | cmp dword ptr [ebp + 0x6c], eax // 7519 | jne 0x1b // 8bc7 | mov eax, edi $sequence_31 = { 69ff903caf90 ff55f4 0faff0 81febed4f06f 0f844bf7ffff 8d45e0 } // n = 6, score = 100 // 69ff903caf90 | imul edi, edi, 0x90af3c90 // ff55f4 | call dword ptr [ebp - 0xc] // 0faff0 | imul esi, eax // 81febed4f06f | cmp esi, 0x6ff0d4be // 0f844bf7ffff | je 0xfffff751 // 8d45e0 | lea eax, [ebp - 0x20] condition: 7 of them and filesize < 204800 }
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