Actor(s): Operation C-Major
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rule win_andromeda_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2021-06-10" 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 = "20210604" malpedia_hash = "be09d5d71e77373c0f538068be31a2ad4c69cfbd" malpedia_version = "20210616" 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 = { 8b7d10 fec0 368a942800ffffff 02da 368ab42b00ffffff } // n = 5, 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] $sequence_1 = { 368a942a00ffffff 301439 41 3b4d14 75c3 61 } // n = 6, score = 800 // 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_2 = { 74cf ebcf 33c0 33db 33c9 } // n = 5, score = 800 // 74cf | je 0xffffffd1 // ebcf | jmp 0xffffffd1 // 33c0 | xor eax, eax // 33db | xor ebx, ebx // 33c9 | xor ecx, ecx $sequence_3 = { 3688b42800ffffff 3688942b00ffffff 02d6 81e2ff000000 } // n = 4, 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 $sequence_4 = { 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_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 = { 60 b940000000 8d7dfc b8fcfdfeff fd } // n = 5, score = 800 // 60 | pushal // b940000000 | mov ecx, 0x40 // 8d7dfc | lea edi, dword ptr [ebp - 4] // b8fcfdfeff | mov eax, 0xfffefdfc // fd | std $sequence_7 = { 02d6 81e2ff000000 368a942a00ffffff 301439 } // n = 4, 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 $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 = { 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_11 = { 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_12 = { 3c5a 0f9ec1 33d2 3c41 0f9dc2 85ca 7404 } // n = 7, score = 400 // 3c5a | cmp al, 0x5a // 0f9ec1 | setle cl // 33d2 | xor edx, edx // 3c41 | cmp al, 0x41 // 0f9dc2 | setge dl // 85ca | test edx, ecx // 7404 | je 6 $sequence_13 = { 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_14 = { 50 e8???????? 83c40c 6800000100 } // n = 4, score = 400 // 50 | push eax // e8???????? | // 83c40c | add esp, 0xc // 6800000100 | push 0x10000 $sequence_15 = { ff75dc ff75e0 e8???????? ff75e0 ff15???????? ff75e8 } // n = 6, score = 300 // ff75dc | push dword ptr [ebp - 0x24] // ff75e0 | push dword ptr [ebp - 0x20] // e8???????? | // ff75e0 | push dword ptr [ebp - 0x20] // ff15???????? | // ff75e8 | push dword ptr [ebp - 0x18] $sequence_16 = { 7466 6a05 ff75f0 e8???????? 83f8ff 7457 } // n = 6, score = 200 // 7466 | je 0x68 // 6a05 | push 5 // ff75f0 | push dword ptr [ebp - 0x10] // e8???????? | // 83f8ff | cmp eax, -1 // 7457 | je 0x59 $sequence_17 = { 6801000080 e8???????? 83f800 7526 ff75f8 } // n = 5, score = 200 // 6801000080 | push 0x80000001 // e8???????? | // 83f800 | cmp eax, 0 // 7526 | jne 0x28 // ff75f8 | push dword ptr [ebp - 8] $sequence_18 = { 6804010000 ff75fc 6a00 e8???????? 6a00 } // n = 5, score = 200 // 6804010000 | push 0x104 // ff75fc | push dword ptr [ebp - 4] // 6a00 | push 0 // e8???????? | // 6a00 | push 0 $sequence_19 = { 6804010000 6a00 ff35???????? e8???????? } // n = 4, score = 200 // 6804010000 | push 0x104 // 6a00 | push 0 // ff35???????? | // e8???????? | $sequence_20 = { 83f800 0f8476010000 6804010000 6a00 } // n = 4, score = 200 // 83f800 | cmp eax, 0 // 0f8476010000 | je 0x17c // 6804010000 | push 0x104 // 6a00 | push 0 $sequence_21 = { 8d7d9c b944000000 f3aa 6a00 6a00 ff75f0 } // n = 6, score = 200 // 8d7d9c | lea edi, dword ptr [ebp - 0x64] // b944000000 | mov ecx, 0x44 // f3aa | rep stosb byte ptr es:[edi], al // 6a00 | push 0 // 6a00 | push 0 // ff75f0 | push dword ptr [ebp - 0x10] $sequence_22 = { ff75f0 e8???????? c7459c44000000 8945d4 8945d8 8945dc 66c745cc0000 } // n = 7, score = 200 // ff75f0 | push dword ptr [ebp - 0x10] // e8???????? | // 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 $sequence_23 = { 6a01 6a02 e8???????? 8945f0 83f8ff 7479 6a10 } // n = 7, score = 200 // 6a01 | push 1 // 6a02 | push 2 // e8???????? | // 8945f0 | mov dword ptr [ebp - 0x10], eax // 83f8ff | cmp eax, -1 // 7479 | je 0x7b // 6a10 | push 0x10 $sequence_24 = { 89450c ff560c 23f8 81ff12d6a55b 74d8 } // n = 5, score = 100 // 89450c | mov dword ptr [ebp + 0xc], eax // ff560c | call dword ptr [esi + 0xc] // 23f8 | and edi, eax // 81ff12d6a55b | cmp edi, 0x5ba5d612 // 74d8 | je 0xffffffda $sequence_25 = { 5b 83c570 c9 c20800 69db71158e70 ff5634 0bf8 } // n = 7, score = 100 // 5b | pop ebx // 83c570 | add ebp, 0x70 // c9 | leave // c20800 | ret 8 // 69db71158e70 | imul ebx, ebx, 0x708e1571 // ff5634 | call dword ptr [esi + 0x34] // 0bf8 | or edi, eax $sequence_26 = { 35ebb0598f 5b 5d c20800 55 } // n = 5, score = 100 // 35ebb0598f | xor eax, 0x8f59b0eb // 5b | pop ebx // 5d | pop ebp // c20800 | ret 8 // 55 | push ebp $sequence_27 = { ff5624 23d8 81e700f0ffff 817508f758d728 ff5638 0fafd8 b84d5a0000 } // n = 7, score = 100 // ff5624 | call dword ptr [esi + 0x24] // 23d8 | and ebx, eax // 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_28 = { eb02 33d2 81cf2c83af71 69f6403b5e1d 81ffad9a5b3f } // n = 5, score = 100 // eb02 | jmp 4 // 33d2 | xor edx, edx // 81cf2c83af71 | or edi, 0x71af832c // 69f6403b5e1d | imul esi, esi, 0x1d5e3b40 // 81ffad9a5b3f | cmp edi, 0x3f5b9aad $sequence_29 = { 35330f90cb 8bd8 ff560c 69ffbe85334b 33f8 81fb301dc592 0f84eafeffff } // n = 7, score = 100 // 35330f90cb | xor eax, 0xcb900f33 // 8bd8 | mov ebx, eax // ff560c | call dword ptr [esi + 0xc] // 69ffbe85334b | imul edi, edi, 0x4b3385be // 33f8 | xor edi, eax // 81fb301dc592 | cmp ebx, 0x92c51d30 // 0f84eafeffff | je 0xfffffef0 $sequence_30 = { ff5608 69fffbd6129a 81f35c0cc773 837df000 } // n = 4, score = 100 // ff5608 | call dword ptr [esi + 8] // 69fffbd6129a | imul edi, edi, 0x9a12d6fb // 81f35c0cc773 | xor ebx, 0x73c70c5c // 837df000 | cmp dword ptr [ebp - 0x10], 0 $sequence_31 = { 81feb8a02326 0f84f6feffff 69f64f646d02 81c754414105 8955fc } // n = 5, score = 100 // 81feb8a02326 | cmp esi, 0x2623a0b8 // 0f84f6feffff | je 0xfffffefc // 69f64f646d02 | imul esi, esi, 0x26d644f // 81c754414105 | add edi, 0x5414154 // 8955fc | mov dword ptr [ebp - 4], edx condition: 7 of them and filesize < 204800 }
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