Actor(s): Operation C-Major
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rule win_andromeda_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" 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 = "20230705" malpedia_hash = "42d0574f4405bd7d2b154d321d345acb18834a41" malpedia_version = "20230715" 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 = { 02da 368ab42b00ffffff 3688b42800ffffff 3688942b00ffffff 02d6 81e2ff000000 368a942a00ffffff } // n = 7, score = 800 // 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 // 368a942a00ffffff | mov dl, byte ptr ss:[edx + ebp - 0x100] $sequence_1 = { 55 8bec 81c400ffffff 60 b940000000 } // n = 5, score = 800 // 55 | push ebp // 8bec | mov ebp, esp // 81c400ffffff | add esp, 0xffffff00 // 60 | pushal // b940000000 | mov ecx, 0x40 $sequence_2 = { 81e2ff000000 368a942a00ffffff 301439 41 3b4d14 75c3 61 } // n = 7, 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] // 75c3 | jne 0xffffffc5 // 61 | popal $sequence_3 = { 33db 33c9 33d2 8b7d10 } // n = 4, score = 800 // 33db | xor ebx, ebx // 33c9 | xor ecx, ecx // 33d2 | xor edx, edx // 8b7d10 | mov edi, dword ptr [ebp + 0x10] $sequence_4 = { 3688942800ffffff fec1 7408 43 3b5d0c 74cf ebcf } // n = 7, score = 800 // 3688942800ffffff | mov byte ptr ss:[eax + ebp - 0x100], dl // fec1 | inc cl // 7408 | je 0xa // 43 | inc ebx // 3b5d0c | cmp ebx, dword ptr [ebp + 0xc] // 74cf | je 0xffffffd1 // ebcf | jmp 0xffffffd1 $sequence_5 = { b940000000 8d7dfc b8fcfdfeff fd } // n = 4, score = 800 // b940000000 | mov ecx, 0x40 // 8d7dfc | lea edi, [ebp - 4] // b8fcfdfeff | mov eax, 0xfffefdfc // fd | std $sequence_6 = { 2d04040404 e2f8 fc 33c0 8b7508 33db 368a942900ffffff } // n = 7, score = 800 // 2d04040404 | sub eax, 0x4040404 // 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_7 = { 8b7508 33db 368a942900ffffff 02c2 020433 368ab42800ffffff 3688b42900ffffff } // n = 7, 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] // 3688b42900ffffff | mov byte ptr ss:[ecx + ebp - 0x100], dh $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 = { 3c41 0f9dc2 85ca 7404 0420 8806 } // n = 6, score = 400 // 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_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 = { 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_13 = { 6a30 8d45d0 50 6a01 ff7508 e8???????? 85c0 } // n = 7, score = 400 // 6a30 | push 0x30 // 8d45d0 | lea eax, [ebp - 0x30] // 50 | push eax // 6a01 | push 1 // ff7508 | push dword ptr [ebp + 8] // e8???????? | // 85c0 | test eax, eax $sequence_14 = { 66c10608 66c1460408 66c1460608 66c1460808 66c1460a08 } // n = 5, score = 300 // 66c10608 | rol word ptr [esi], 8 // 66c1460408 | rol word ptr [esi + 4], 8 // 66c1460608 | rol word ptr [esi + 6], 8 // 66c1460808 | rol word ptr [esi + 8], 8 // 66c1460a08 | rol word ptr [esi + 0xa], 8 $sequence_15 = { 6811010000 57 68???????? ff15???????? 50 } // n = 5, score = 300 // 6811010000 | push 0x111 // 57 | push edi // 68???????? | // ff15???????? | // 50 | push eax $sequence_16 = { 7526 ff75f8 e8???????? 40 } // n = 4, score = 200 // 7526 | jne 0x28 // ff75f8 | push dword ptr [ebp - 8] // e8???????? | // 40 | inc eax $sequence_17 = { ff75f8 ff75fc e8???????? 6a06 ff75f8 e8???????? 8d45f4 } // n = 7, score = 200 // ff75f8 | push dword ptr [ebp - 8] // ff75fc | push dword ptr [ebp - 4] // e8???????? | // 6a06 | push 6 // ff75f8 | push dword ptr [ebp - 8] // e8???????? | // 8d45f4 | lea eax, [ebp - 0xc] $sequence_18 = { 6a00 ff35???????? e8???????? 8945f8 83f800 } // n = 5, score = 200 // 6a00 | push 0 // ff35???????? | // e8???????? | // 8945f8 | mov dword ptr [ebp - 8], eax // 83f800 | cmp eax, 0 $sequence_19 = { 6804010000 ff75f8 68???????? e8???????? 6804010000 ff75fc 6a00 } // n = 7, score = 200 // 6804010000 | push 0x104 // ff75f8 | push dword ptr [ebp - 8] // 68???????? | // e8???????? | // 6804010000 | push 0x104 // ff75fc | push dword ptr [ebp - 4] // 6a00 | push 0 $sequence_20 = { 6a10 8d45e0 50 ff75f0 e8???????? 83f8ff 7466 } // n = 7, score = 200 // 6a10 | push 0x10 // 8d45e0 | lea eax, [ebp - 0x20] // 50 | push eax // ff75f0 | push dword ptr [ebp - 0x10] // e8???????? | // 83f8ff | cmp eax, -1 // 7466 | je 0x68 $sequence_21 = { 7457 33c0 8d7d9c b944000000 f3aa 6a00 } // n = 6, 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 $sequence_22 = { 6a00 68???????? 6802000080 e8???????? 83f800 741f 8d45f4 } // n = 7, score = 200 // 6a00 | push 0 // 68???????? | // 6802000080 | push 0x80000002 // e8???????? | // 83f800 | cmp eax, 0 // 741f | je 0x21 // 8d45f4 | lea eax, [ebp - 0xc] $sequence_23 = { 6a00 6a06 6a01 6a02 e8???????? 8945f0 } // n = 6, score = 200 // 6a00 | push 0 // 6a06 | push 6 // 6a01 | push 1 // 6a02 | push 2 // e8???????? | // 8945f0 | mov dword ptr [ebp - 0x10], eax $sequence_24 = { ebdd 4b 81c1ec94ed46 81c27ec28f2d eb89 } // n = 5, score = 100 // ebdd | jmp 0xffffffdf // 4b | dec ebx // 81c1ec94ed46 | add ecx, 0x46ed94ec // 81c27ec28f2d | add edx, 0x2d8fc27e // eb89 | jmp 0xffffff8b $sequence_25 = { ff5638 0faf45e4 8bf8 ff5624 69db0132fa43 ff75f8 f7d8 } // n = 7, score = 100 // ff5638 | call dword ptr [esi + 0x38] // 0faf45e4 | imul eax, dword ptr [ebp - 0x1c] // 8bf8 | mov edi, eax // ff5624 | call dword ptr [esi + 0x24] // 69db0132fa43 | imul ebx, ebx, 0x43fa3201 // ff75f8 | push dword ptr [ebp - 8] // f7d8 | neg eax $sequence_26 = { 8b45fc 8d440026 50 6a08 ff750c ff5604 894510 } // n = 7, score = 100 // 8b45fc | mov eax, dword ptr [ebp - 4] // 8d440026 | lea eax, [eax + eax + 0x26] // 50 | push eax // 6a08 | push 8 // ff750c | push dword ptr [ebp + 0xc] // ff5604 | call dword ptr [esi + 4] // 894510 | mov dword ptr [ebp + 0x10], eax $sequence_27 = { ff5614 23d8 81ef5b9adf33 81fb207ec5f4 7583 e9???????? c64405d800 } // n = 7, score = 100 // ff5614 | call dword ptr [esi + 0x14] // 23d8 | and ebx, eax // 81ef5b9adf33 | sub edi, 0x33df9a5b // 81fb207ec5f4 | cmp ebx, 0xf4c57e20 // 7583 | jne 0xffffff85 // e9???????? | // c64405d800 | mov byte ptr [ebp + eax - 0x28], 0 $sequence_28 = { ff5644 ff5614 0fafd8 56 } // n = 4, score = 100 // ff5644 | call dword ptr [esi + 0x44] // ff5614 | call dword ptr [esi + 0x14] // 0fafd8 | imul ebx, eax // 56 | push esi $sequence_29 = { 8b400c 89456c 6af5 ff5630 23d8 ff560c } // n = 6, score = 100 // 8b400c | mov eax, dword ptr [eax + 0xc] // 89456c | mov dword ptr [ebp + 0x6c], eax // 6af5 | push -0xb // ff5630 | call dword ptr [esi + 0x30] // 23d8 | and ebx, eax // ff560c | call dword ptr [esi + 0xc] $sequence_30 = { 81e700f0ffff 817508f758d728 ff5638 0fafd8 b84d5a0000 } // n = 5, score = 100 // 81e700f0ffff | and edi, 0xfffff000 // 817508f758d728 | xor dword ptr [ebp + 8], 0x28d758f7 // ff5638 | call dword ptr [esi + 0x38] // 0fafd8 | imul ebx, eax // b84d5a0000 | mov eax, 0x5a4d $sequence_31 = { 69fff24c07dd 0bf8 8b45f0 81cbbfdf851b } // n = 4, score = 100 // 69fff24c07dd | imul edi, edi, 0xdd074cf2 // 0bf8 | or edi, eax // 8b45f0 | mov eax, dword ptr [ebp - 0x10] // 81cbbfdf851b | or ebx, 0x1b85dfbf condition: 7 of them and filesize < 204800 }
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