Actor(s): Operation C-Major
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rule win_andromeda_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2024-10-31" 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 = "20241030" malpedia_hash = "26e26953c49c8efafbf72a38076855d578e0a2e4" malpedia_version = "20241030" 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 = { ebcf 33c0 33db 33c9 33d2 } // n = 5, score = 800 // ebcf | jmp 0xffffffd1 // 33c0 | xor eax, eax // 33db | xor ebx, ebx // 33c9 | xor ecx, ecx // 33d2 | xor edx, edx $sequence_1 = { 368a942800ffffff 02da 368ab42b00ffffff 3688b42800ffffff } // n = 4, score = 800 // 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_2 = { fc 33c0 8b7508 33db 368a942900ffffff 02c2 } // n = 6, score = 800 // 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] // 02c2 | add al, dl $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 = { 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 = { 8d7dfc b8fcfdfeff fd ab 2d04040404 e2f8 fc } // n = 7, 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 // fc | cld $sequence_6 = { 368a942900ffffff 02c2 020433 368ab42800ffffff 3688b42900ffffff 3688942800ffffff fec1 } // n = 7, score = 800 // 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 // 3688942800ffffff | mov byte ptr ss:[eax + ebp - 0x100], dl // fec1 | inc cl $sequence_7 = { 81c400ffffff 60 b940000000 8d7dfc b8fcfdfeff fd } // n = 6, score = 800 // 81c400ffffff | add esp, 0xffffff00 // 60 | pushal // b940000000 | mov ecx, 0x40 // 8d7dfc | lea edi, [ebp - 4] // b8fcfdfeff | mov eax, 0xfffefdfc // fd | std $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 = { 0f9ec1 33d2 3c41 0f9dc2 85ca 7404 } // n = 6, score = 400 // 0f9ec1 | setle cl // 33d2 | xor edx, edx // 3c41 | cmp al, 0x41 // 0f9dc2 | setge dl // 85ca | test edx, ecx // 7404 | je 6 $sequence_12 = { 8a06 33c9 3c5a 0f9ec1 33d2 } // n = 5, score = 400 // 8a06 | mov al, byte ptr [esi] // 33c9 | xor ecx, ecx // 3c5a | cmp al, 0x5a // 0f9ec1 | setle cl // 33d2 | xor edx, edx $sequence_13 = { 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_14 = { 6a30 8d45d0 50 6a01 ff7508 } // n = 5, score = 400 // 6a30 | push 0x30 // 8d45d0 | lea eax, [ebp - 0x30] // 50 | push eax // 6a01 | push 1 // ff7508 | push dword ptr [ebp + 8] $sequence_15 = { 56 6800010400 56 56 56 ff750c } // n = 6, score = 300 // 56 | push esi // 6800010400 | push 0x40100 // 56 | push esi // 56 | push esi // 56 | push esi // ff750c | push dword ptr [ebp + 0xc] $sequence_16 = { e8???????? 8945fc 83f800 0f8476010000 6804010000 6a00 } // n = 6, score = 200 // e8???????? | // 8945fc | mov dword ptr [ebp - 4], eax // 83f800 | cmp eax, 0 // 0f8476010000 | je 0x17c // 6804010000 | push 0x104 // 6a00 | push 0 $sequence_17 = { ff35???????? e8???????? 8945f8 83f800 0f8458010000 6804010000 ff75f8 } // n = 7, score = 200 // ff35???????? | // e8???????? | // 8945f8 | mov dword ptr [ebp - 8], eax // 83f800 | cmp eax, 0 // 0f8458010000 | je 0x15e // 6804010000 | push 0x104 // ff75f8 | push dword ptr [ebp - 8] $sequence_18 = { f3aa 6a00 6a00 ff75f0 e8???????? c7459c44000000 } // n = 6, score = 200 // f3aa | rep stosb byte ptr es:[edi], al // 6a00 | push 0 // 6a00 | push 0 // ff75f0 | push dword ptr [ebp - 0x10] // e8???????? | // c7459c44000000 | mov dword ptr [ebp - 0x64], 0x44 $sequence_19 = { a3???????? 6804010000 6a00 ff35???????? e8???????? } // n = 5, score = 200 // a3???????? | // 6804010000 | push 0x104 // 6a00 | push 0 // ff35???????? | // e8???????? | $sequence_20 = { 68???????? 6801000080 e8???????? 83f800 } // n = 4, score = 200 // 68???????? | // 6801000080 | push 0x80000001 // e8???????? | // 83f800 | cmp eax, 0 $sequence_21 = { ff75fc 6a00 e8???????? 6a00 ff75f8 ff75fc e8???????? } // n = 7, score = 200 // ff75fc | push dword ptr [ebp - 4] // 6a00 | push 0 // e8???????? | // 6a00 | push 0 // ff75f8 | push dword ptr [ebp - 8] // ff75fc | push dword ptr [ebp - 4] // e8???????? | $sequence_22 = { e8???????? 6a06 ff75f8 e8???????? 8d45f4 50 } // n = 6, score = 200 // e8???????? | // 6a06 | push 6 // ff75f8 | push dword ptr [ebp - 8] // e8???????? | // 8d45f4 | lea eax, [ebp - 0xc] // 50 | push eax $sequence_23 = { 83f8ff 7457 33c0 8d7d9c } // n = 4, score = 200 // 83f8ff | cmp eax, -1 // 7457 | je 0x59 // 33c0 | xor eax, eax // 8d7d9c | lea edi, [ebp - 0x64] $sequence_24 = { 8b45ec 8b55fc 8b0490 81f683073af8 81e7d889e666 8945f8 } // n = 6, score = 100 // 8b45ec | mov eax, dword ptr [ebp - 0x14] // 8b55fc | mov edx, dword ptr [ebp - 4] // 8b0490 | mov eax, dword ptr [eax + edx*4] // 81f683073af8 | xor esi, 0xf83a0783 // 81e7d889e666 | and edi, 0x66e689d8 // 8945f8 | mov dword ptr [ebp - 8], eax $sequence_25 = { 81fe50f639e3 0f84a2f7ffff 81455886080000 69ffc520db89 ff5518 } // n = 5, score = 100 // 81fe50f639e3 | cmp esi, 0xe339f650 // 0f84a2f7ffff | je 0xfffff7a8 // 81455886080000 | add dword ptr [ebp + 0x58], 0x886 // 69ffc520db89 | imul edi, edi, 0x89db20c5 // ff5518 | call dword ptr [ebp + 0x18] $sequence_26 = { 69f676ce078f 81ef4b9d0e76 81ff901d63a9 0f84f1010000 8b4544 } // n = 5, score = 100 // 69f676ce078f | imul esi, esi, 0x8f07ce76 // 81ef4b9d0e76 | sub edi, 0x760e9d4b // 81ff901d63a9 | cmp edi, 0xa9631d90 // 0f84f1010000 | je 0x1f7 // 8b4544 | mov eax, dword ptr [ebp + 0x44] $sequence_27 = { 0f856afeffff e9???????? 55 8bec 83ec24 53 56 } // n = 7, score = 100 // 0f856afeffff | jne 0xfffffe70 // e9???????? | // 55 | push ebp // 8bec | mov ebp, esp // 83ec24 | sub esp, 0x24 // 53 | push ebx // 56 | push esi $sequence_28 = { 8bd8 ff5630 8bf8 ff560c 23d8 ff5638 } // n = 6, score = 100 // 8bd8 | mov ebx, eax // ff5630 | call dword ptr [esi + 0x30] // 8bf8 | mov edi, eax // ff560c | call dword ptr [esi + 0xc] // 23d8 | and ebx, eax // ff5638 | call dword ptr [esi + 0x38] $sequence_29 = { 69ffbb3de4b4 d1e8 81f679b291d1 894544 3d80000000 7363 } // n = 6, score = 100 // 69ffbb3de4b4 | imul edi, edi, 0xb4e43dbb // d1e8 | shr eax, 1 // 81f679b291d1 | xor esi, 0xd191b279 // 894544 | mov dword ptr [ebp + 0x44], eax // 3d80000000 | cmp eax, 0x80 // 7363 | jae 0x65 $sequence_30 = { 03c1 8b4df0 0fb609 03ca 81e1ff000000 } // n = 5, score = 100 // 03c1 | add eax, ecx // 8b4df0 | mov ecx, dword ptr [ebp - 0x10] // 0fb609 | movzx ecx, byte ptr [ecx] // 03ca | add ecx, edx // 81e1ff000000 | and ecx, 0xff $sequence_31 = { 8b456c 8b4018 894560 81c3b6dd7f19 ff5634 0faff8 } // n = 6, score = 100 // 8b456c | mov eax, dword ptr [ebp + 0x6c] // 8b4018 | mov eax, dword ptr [eax + 0x18] // 894560 | mov dword ptr [ebp + 0x60], eax // 81c3b6dd7f19 | add ebx, 0x197fddb6 // ff5634 | call dword ptr [esi + 0x34] // 0faff8 | imul edi, eax condition: 7 of them and filesize < 204800 }
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