Actor(s): Operation C-Major
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rule win_andromeda_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-05-16" 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 = "20220513" malpedia_hash = "7f4b2229e6ae614d86d74917f6d5b41890e62a26" malpedia_version = "20220516" 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 = { 81c400ffffff 60 b940000000 8d7dfc } // n = 4, score = 800 // 81c400ffffff | add esp, 0xffffff00 // 60 | pushal // b940000000 | mov ecx, 0x40 // 8d7dfc | lea edi, [ebp - 4] $sequence_1 = { 41 3b4d14 75c3 61 } // n = 4, score = 800 // 41 | inc ecx // 3b4d14 | cmp ecx, dword ptr [ebp + 0x14] // 75c3 | jne 0xffffffc5 // 61 | popal $sequence_2 = { fd ab 2d04040404 e2f8 fc 33c0 } // n = 6, score = 800 // fd | std // ab | stosd dword ptr es:[edi], eax // 2d04040404 | sub eax, 0x4040404 // e2f8 | loop 0xfffffffa // fc | cld // 33c0 | xor eax, eax $sequence_3 = { b940000000 8d7dfc b8fcfdfeff fd ab } // n = 5, score = 800 // b940000000 | mov ecx, 0x40 // 8d7dfc | lea edi, [ebp - 4] // b8fcfdfeff | mov eax, 0xfffefdfc // fd | std // ab | stosd dword ptr es:[edi], eax $sequence_4 = { 33d2 8b7d10 fec0 368a942800ffffff 02da 368ab42b00ffffff } // n = 6, score = 800 // 33d2 | xor edx, edx // 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_5 = { 3b5d0c 74cf ebcf 33c0 33db 33c9 } // n = 6, score = 800 // 3b5d0c | cmp ebx, dword ptr [ebp + 0xc] // 74cf | je 0xffffffd1 // ebcf | jmp 0xffffffd1 // 33c0 | xor eax, eax // 33db | xor ebx, ebx // 33c9 | xor ecx, ecx $sequence_6 = { 020433 368ab42800ffffff 3688b42900ffffff 3688942800ffffff fec1 7408 } // n = 6, 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 $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???????? 33c9 } // n = 5, score = 700 // 60 | pushal // e8???????? | // 5d | pop ebp // 81ed???????? | // 33c9 | xor ecx, ecx $sequence_9 = { 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_10 = { 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_11 = { 6a30 8d45d0 50 6a01 } // n = 4, score = 400 // 6a30 | push 0x30 // 8d45d0 | lea eax, [ebp - 0x30] // 50 | push eax // 6a01 | push 1 $sequence_12 = { 50 e8???????? 83c40c 6800000100 e8???????? } // n = 5, score = 400 // 50 | push eax // e8???????? | // 83c40c | add esp, 0xc // 6800000100 | push 0x10000 // e8???????? | $sequence_13 = { 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_14 = { 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_15 = { 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_16 = { c7459c44000000 8945d4 8945d8 8945dc 66c745cc0000 } // n = 5, score = 200 // 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_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 = { 6a00 ff35???????? e8???????? 8945fc 83f800 } // n = 5, score = 200 // 6a00 | push 0 // ff35???????? | // e8???????? | // 8945fc | mov dword ptr [ebp - 4], eax // 83f800 | cmp eax, 0 $sequence_19 = { 83f800 0f8458010000 6804010000 ff75f8 68???????? } // n = 5, score = 200 // 83f800 | cmp eax, 0 // 0f8458010000 | je 0x15e // 6804010000 | push 0x104 // ff75f8 | push dword ptr [ebp - 8] // 68???????? | $sequence_20 = { b944000000 f3aa 6a00 6a00 ff75f0 } // n = 5, score = 200 // 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_21 = { ff75f4 e8???????? 68???????? 6801010000 e8???????? 66c745e00200 } // n = 6, score = 200 // ff75f4 | push dword ptr [ebp - 0xc] // e8???????? | // 68???????? | // 6801010000 | push 0x101 // e8???????? | // 66c745e00200 | mov word ptr [ebp - 0x20], 2 $sequence_22 = { 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_23 = { 50 8d459c 50 6a00 6a00 6a00 } // n = 6, score = 200 // 50 | push eax // 8d459c | lea eax, [ebp - 0x64] // 50 | push eax // 6a00 | push 0 // 6a00 | push 0 // 6a00 | push 0 $sequence_24 = { 0f85ae000000 81ef52eceb06 ff5634 8bd8 81cb15af295e 8b45fc } // n = 6, score = 100 // 0f85ae000000 | jne 0xb4 // 81ef52eceb06 | sub edi, 0x6ebec52 // ff5634 | call dword ptr [esi + 0x34] // 8bd8 | mov ebx, eax // 81cb15af295e | or ebx, 0x5e29af15 // 8b45fc | mov eax, dword ptr [ebp - 4] $sequence_25 = { b84d5a0000 eb13 816d08d4a22127 81ef00100000 } // n = 4, score = 100 // b84d5a0000 | mov eax, 0x5a4d // eb13 | jmp 0x15 // 816d08d4a22127 | sub dword ptr [ebp + 8], 0x2721a2d4 // 81ef00100000 | sub edi, 0x1000 $sequence_26 = { ff7508 ff5510 81e723fc4c01 81e66c479060 } // n = 4, score = 100 // ff7508 | push dword ptr [ebp + 8] // ff5510 | call dword ptr [ebp + 0x10] // 81e723fc4c01 | and edi, 0x14cfc23 // 81e66c479060 | and esi, 0x6090476c $sequence_27 = { 0f8465feffff 85c0 742b ff7514 014df8 ff75f8 81c71611b536 } // n = 7, score = 100 // 0f8465feffff | je 0xfffffe6b // 85c0 | test eax, eax // 742b | je 0x2d // ff7514 | push dword ptr [ebp + 0x14] // 014df8 | add dword ptr [ebp - 8], ecx // ff75f8 | push dword ptr [ebp - 8] // 81c71611b536 | add edi, 0x36b51116 $sequence_28 = { 7509 395510 0f84f0000000 014df4 69f63044f41b 69ffd753a63c 81eed7b5870c } // n = 7, score = 100 // 7509 | jne 0xb // 395510 | cmp dword ptr [ebp + 0x10], edx // 0f84f0000000 | je 0xf6 // 014df4 | add dword ptr [ebp - 0xc], ecx // 69f63044f41b | imul esi, esi, 0x1bf44430 // 69ffd753a63c | imul edi, edi, 0x3ca653d7 // 81eed7b5870c | sub esi, 0xc87b5d7 $sequence_29 = { ff5618 894518 e9???????? 8b45fc 83c02c 50 ff5618 } // n = 7, score = 100 // ff5618 | call dword ptr [esi + 0x18] // 894518 | mov dword ptr [ebp + 0x18], eax // e9???????? | // 8b45fc | mov eax, dword ptr [ebp - 4] // 83c02c | add eax, 0x2c // 50 | push eax // ff5618 | call dword ptr [esi + 0x18] $sequence_30 = { ff5624 03d8 837de8ff 0f8490000000 837d1400 74bf } // n = 6, score = 100 // ff5624 | call dword ptr [esi + 0x24] // 03d8 | add ebx, eax // 837de8ff | cmp dword ptr [ebp - 0x18], -1 // 0f8490000000 | je 0x96 // 837d1400 | cmp dword ptr [ebp + 0x14], 0 // 74bf | je 0xffffffc1 $sequence_31 = { 83c02c 894564 81cb78108f42 81e7b64ca74d 81fb5ace4646 0f84d1000000 8b4564 } // n = 7, score = 100 // 83c02c | add eax, 0x2c // 894564 | mov dword ptr [ebp + 0x64], eax // 81cb78108f42 | or ebx, 0x428f1078 // 81e7b64ca74d | and edi, 0x4da74cb6 // 81fb5ace4646 | cmp ebx, 0x4646ce5a // 0f84d1000000 | je 0xd7 // 8b4564 | mov eax, dword ptr [ebp + 0x64] condition: 7 of them and filesize < 204800 }
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