Actor(s): Operation C-Major
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rule win_andromeda_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2020-10-14" version = "1" description = "autogenerated rule brought to you by yara-signator" tool = "yara-signator v0.5.0" tool_config = "callsandjumps;datarefs;binvalue" malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.andromeda" malpedia_rule_date = "20201014" malpedia_hash = "a7e3bd57eaf12bf3ea29a863c041091ba3af9ac9" malpedia_version = "20201014" 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 = { 33d2 8b7d10 fec0 368a942800ffffff } // n = 4, 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] $sequence_2 = { b8fcfdfeff fd ab 2d04040404 e2f8 fc } // n = 6, score = 800 // b8fcfdfeff | mov eax, 0xfffefdfc // fd | std // ab | stosd dword ptr es:[edi], eax // 2d04040404 | sub eax, 0x4040404 // e2f8 | loop 0xfffffffa // fc | cld $sequence_3 = { fec1 7408 43 3b5d0c 74cf ebcf } // n = 6, score = 800 // fec1 | inc cl // 7408 | je 0xa // 43 | inc ebx // 3b5d0c | cmp ebx, dword ptr [ebp + 0xc] // 74cf | je 0xffffffd1 // ebcf | jmp 0xffffffd1 $sequence_4 = { 02d6 81e2ff000000 368a942a00ffffff 301439 41 3b4d14 75c3 } // n = 7, 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 // 41 | inc ecx // 3b4d14 | cmp ecx, dword ptr [ebp + 0x14] // 75c3 | jne 0xffffffc5 $sequence_5 = { 368ab42800ffffff 3688b42900ffffff 3688942800ffffff fec1 7408 43 } // n = 6, score = 800 // 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_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 = { 33db 368a942900ffffff 02c2 020433 } // n = 4, score = 800 // 33db | xor ebx, ebx // 368a942900ffffff | mov dl, byte ptr ss:[ecx + ebp - 0x100] // 02c2 | add al, dl // 020433 | add al, byte ptr [ebx + esi] $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 = { 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 = { 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_12 = { 6a30 8d45d0 50 6a01 } // n = 4, score = 400 // 6a30 | push 0x30 // 8d45d0 | lea eax, [ebp - 0x30] // 50 | push eax // 6a01 | push 1 $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 = { 33d2 3c41 0f9dc2 85ca 7404 } // n = 5, score = 400 // 33d2 | xor edx, edx // 3c41 | cmp al, 0x41 // 0f9dc2 | setge dl // 85ca | test edx, ecx // 7404 | je 6 $sequence_15 = { 39757c 750c c7455801000000 e9???????? } // n = 4, score = 300 // 39757c | cmp dword ptr [ebp + 0x7c], esi // 750c | jne 0xe // c7455801000000 | mov dword ptr [ebp + 0x58], 1 // e9???????? | $sequence_16 = { 68401f0000 e8???????? 668945e2 c745e400000000 6a00 } // n = 5, score = 200 // 68401f0000 | push 0x1f40 // e8???????? | // 668945e2 | mov word ptr [ebp - 0x1e], ax // c745e400000000 | mov dword ptr [ebp - 0x1c], 0 // 6a00 | push 0 $sequence_17 = { 6a01 6a02 e8???????? 8945f0 83f8ff } // n = 5, score = 200 // 6a01 | push 1 // 6a02 | push 2 // e8???????? | // 8945f0 | mov dword ptr [ebp - 0x10], eax // 83f8ff | cmp eax, -1 $sequence_18 = { c7459c44000000 8945d4 8945d8 8945dc 66c745cc0000 c745c801010000 } // n = 6, 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 // c745c801010000 | mov dword ptr [ebp - 0x38], 0x101 $sequence_19 = { e8???????? 6804010000 ff75fc 6a00 e8???????? } // n = 5, score = 200 // e8???????? | // 6804010000 | push 0x104 // ff75fc | push dword ptr [ebp - 4] // 6a00 | push 0 // e8???????? | $sequence_20 = { 6804010000 6a00 ff35???????? e8???????? 8945fc 83f800 0f8476010000 } // n = 7, score = 200 // 6804010000 | push 0x104 // 6a00 | push 0 // ff35???????? | // e8???????? | // 8945fc | mov dword ptr [ebp - 4], eax // 83f800 | cmp eax, 0 // 0f8476010000 | je 0x17c $sequence_21 = { 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_22 = { 6802000080 e8???????? 83f800 741f } // n = 4, score = 200 // 6802000080 | push 0x80000002 // e8???????? | // 83f800 | cmp eax, 0 // 741f | je 0x21 $sequence_23 = { 7457 33c0 8d7d9c b944000000 f3aa 6a00 6a00 } // n = 7, 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 // 6a00 | push 0 $sequence_24 = { 69ff77f02186 81c6002a7b28 8945ec 3bc2 0f848d010000 8b4d08 } // n = 6, score = 100 // 69ff77f02186 | imul edi, edi, 0x8621f077 // 81c6002a7b28 | add esi, 0x287b2a00 // 8945ec | mov dword ptr [ebp - 0x14], eax // 3bc2 | cmp eax, edx // 0f848d010000 | je 0x193 // 8b4d08 | mov ecx, dword ptr [ebp + 8] $sequence_25 = { 0bd8 ff4518 8345ec02 81c7140d011a } // n = 4, score = 100 // 0bd8 | or ebx, eax // ff4518 | inc dword ptr [ebp + 0x18] // 8345ec02 | add dword ptr [ebp - 0x14], 2 // 81c7140d011a | add edi, 0x1a010d14 $sequence_26 = { 81fb15af295e 0f85ae000000 81ef52eceb06 ff5634 8bd8 } // n = 5, score = 100 // 81fb15af295e | cmp ebx, 0x5e29af15 // 0f85ae000000 | jne 0xb4 // 81ef52eceb06 | sub edi, 0x6ebec52 // ff5634 | call dword ptr [esi + 0x34] // 8bd8 | mov ebx, eax $sequence_27 = { 69ff8f2fd132 8945f0 8b45fc 8b401c 81e32a861356 } // n = 5, score = 100 // 69ff8f2fd132 | imul edi, edi, 0x32d12f8f // 8945f0 | mov dword ptr [ebp - 0x10], eax // 8b45fc | mov eax, dword ptr [ebp - 4] // 8b401c | mov eax, dword ptr [eax + 0x1c] // 81e32a861356 | and ebx, 0x5613862a $sequence_28 = { ff7510 ff564c 8945e8 e9???????? 8bc3 33c7 } // n = 6, score = 100 // ff7510 | push dword ptr [ebp + 0x10] // ff564c | call dword ptr [esi + 0x4c] // 8945e8 | mov dword ptr [ebp - 0x18], eax // e9???????? | // 8bc3 | mov eax, ebx // 33c7 | xor eax, edi $sequence_29 = { ff7510 ff75f8 ff5648 ff5634 0fafc7 8945e4 8b45fc } // n = 7, score = 100 // ff7510 | push dword ptr [ebp + 0x10] // ff75f8 | push dword ptr [ebp - 8] // ff5648 | call dword ptr [esi + 0x48] // ff5634 | call dword ptr [esi + 0x34] // 0fafc7 | imul eax, edi // 8945e4 | mov dword ptr [ebp - 0x1c], eax // 8b45fc | mov eax, dword ptr [ebp - 4] $sequence_30 = { 0faf5d0c ff560c 0fafc7 89450c 8b45f0 3145fc ff5614 } // n = 7, score = 100 // 0faf5d0c | imul ebx, dword ptr [ebp + 0xc] // ff560c | call dword ptr [esi + 0xc] // 0fafc7 | imul eax, edi // 89450c | mov dword ptr [ebp + 0xc], eax // 8b45f0 | mov eax, dword ptr [ebp - 0x10] // 3145fc | xor dword ptr [ebp - 4], eax // ff5614 | call dword ptr [esi + 0x14] $sequence_31 = { 895df0 81ffed2be59b 0f846bffffff f7db ff560c 23f8 } // n = 6, score = 100 // 895df0 | mov dword ptr [ebp - 0x10], ebx // 81ffed2be59b | cmp edi, 0x9be52bed // 0f846bffffff | je 0xffffff71 // f7db | neg ebx // ff560c | call dword ptr [esi + 0xc] // 23f8 | and edi, eax condition: 7 of them and filesize < 204800 }
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