Actor(s): Operation C-Major
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rule win_andromeda_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" 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 = "20230124" malpedia_hash = "2ee0eebba83dce3d019a90519f2f972c0fcf9686" malpedia_version = "20230125" 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 = { 301439 41 3b4d14 75c3 } // n = 4, score = 800 // 301439 | xor byte ptr [ecx + edi], dl // 41 | inc ecx // 3b4d14 | cmp ecx, dword ptr [ebp + 0x14] // 75c3 | jne 0xffffffc5 $sequence_1 = { 7408 43 3b5d0c 74cf } // n = 4, score = 800 // 7408 | je 0xa // 43 | inc ebx // 3b5d0c | cmp ebx, dword ptr [ebp + 0xc] // 74cf | je 0xffffffd1 $sequence_2 = { 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_3 = { 81c400ffffff 60 b940000000 8d7dfc b8fcfdfeff } // n = 5, score = 800 // 81c400ffffff | add esp, 0xffffff00 // 60 | pushal // b940000000 | mov ecx, 0x40 // 8d7dfc | lea edi, [ebp - 4] // b8fcfdfeff | mov eax, 0xfffefdfc $sequence_4 = { 368a942900ffffff 02c2 020433 368ab42800ffffff } // n = 4, 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] $sequence_5 = { 368a942800ffffff 02da 368ab42b00ffffff 3688b42800ffffff 3688942b00ffffff 02d6 } // n = 6, 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 // 3688942b00ffffff | mov byte ptr ss:[ebx + ebp - 0x100], dl // 02d6 | add dl, dh $sequence_6 = { 3688942800ffffff fec1 7408 43 } // n = 4, score = 800 // 3688942800ffffff | mov byte ptr ss:[eax + ebp - 0x100], dl // fec1 | inc cl // 7408 | je 0xa // 43 | inc ebx $sequence_7 = { b8fcfdfeff fd ab 2d04040404 e2f8 fc 33c0 } // n = 7, score = 800 // b8fcfdfeff | mov eax, 0xfffefdfc // fd | std // ab | stosd dword ptr es:[edi], eax // 2d04040404 | sub eax, 0x4040404 // e2f8 | loop 0xfffffffa // fc | cld // 33c0 | xor eax, eax $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 = { 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_11 = { 0f9dc2 85ca 7404 0420 } // n = 4, score = 400 // 0f9dc2 | setge dl // 85ca | test edx, ecx // 7404 | je 6 // 0420 | add al, 0x20 $sequence_12 = { 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_13 = { 6a30 8d45d0 50 6a01 ff7508 e8???????? } // n = 6, score = 400 // 6a30 | push 0x30 // 8d45d0 | lea eax, [ebp - 0x30] // 50 | push eax // 6a01 | push 1 // ff7508 | push dword ptr [ebp + 8] // e8???????? | $sequence_14 = { 8945e4 e8???????? 8945e8 3bc6 } // n = 4, score = 300 // 8945e4 | mov dword ptr [ebp - 0x1c], eax // e8???????? | // 8945e8 | mov dword ptr [ebp - 0x18], eax // 3bc6 | cmp eax, esi $sequence_15 = { 8975bc 8b35???????? 83c40c c745c040040000 } // n = 4, score = 300 // 8975bc | mov dword ptr [ebp - 0x44], esi // 8b35???????? | // 83c40c | add esp, 0xc // c745c040040000 | mov dword ptr [ebp - 0x40], 0x440 $sequence_16 = { 6a10 8d45e0 50 ff75f0 } // n = 4, score = 200 // 6a10 | push 0x10 // 8d45e0 | lea eax, [ebp - 0x20] // 50 | push eax // ff75f0 | push dword ptr [ebp - 0x10] $sequence_17 = { ff75fc 6a00 e8???????? 6a00 ff75f8 ff75fc } // n = 6, 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] $sequence_18 = { 0f8476010000 6804010000 6a00 ff35???????? } // n = 4, score = 200 // 0f8476010000 | je 0x17c // 6804010000 | push 0x104 // 6a00 | push 0 // ff35???????? | $sequence_19 = { ff75fc e8???????? 6a06 ff75f8 e8???????? 8d45f4 50 } // n = 7, score = 200 // ff75fc | push dword ptr [ebp - 4] // e8???????? | // 6a06 | push 6 // ff75f8 | push dword ptr [ebp - 8] // e8???????? | // 8d45f4 | lea eax, [ebp - 0xc] // 50 | push eax $sequence_20 = { 6a01 6a00 6a00 68???????? 6a00 e8???????? eba9 } // n = 7, score = 200 // 6a01 | push 1 // 6a00 | push 0 // 6a00 | push 0 // 68???????? | // 6a00 | push 0 // e8???????? | // eba9 | jmp 0xffffffab $sequence_21 = { 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_22 = { 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_23 = { 6a00 68???????? 6801000080 e8???????? 83f800 7526 ff75f8 } // n = 7, score = 200 // 6a00 | push 0 // 68???????? | // 6801000080 | push 0x80000001 // e8???????? | // 83f800 | cmp eax, 0 // 7526 | jne 0x28 // ff75f8 | push dword ptr [ebp - 8] $sequence_24 = { ff5634 8365f400 8bf8 ff5634 8b4d0c } // n = 5, score = 100 // ff5634 | call dword ptr [esi + 0x34] // 8365f400 | and dword ptr [ebp - 0xc], 0 // 8bf8 | mov edi, eax // ff5634 | call dword ptr [esi + 0x34] // 8b4d0c | mov ecx, dword ptr [ebp + 0xc] $sequence_25 = { 81e32a861356 81f71b1ccc93 81f3db50ed3e 8945ec 81ff7185baee 7456 85c0 } // n = 7, score = 100 // 81e32a861356 | and ebx, 0x5613862a // 81f71b1ccc93 | xor edi, 0x93cc1c1b // 81f3db50ed3e | xor ebx, 0x3eed50db // 8945ec | mov dword ptr [ebp - 0x14], eax // 81ff7185baee | cmp edi, 0xeeba8571 // 7456 | je 0x58 // 85c0 | test eax, eax $sequence_26 = { eb10 8bc7 23450c 3dd39987df 0f85da000000 ff560c 0faf450c } // n = 7, score = 100 // eb10 | jmp 0x12 // 8bc7 | mov eax, edi // 23450c | and eax, dword ptr [ebp + 0xc] // 3dd39987df | cmp eax, 0xdf8799d3 // 0f85da000000 | jne 0xe0 // ff560c | call dword ptr [esi + 0xc] // 0faf450c | imul eax, dword ptr [ebp + 0xc] $sequence_27 = { 6af5 8bf8 ff5630 0bd8 } // n = 4, score = 100 // 6af5 | push -0xb // 8bf8 | mov edi, eax // ff5630 | call dword ptr [esi + 0x30] // 0bd8 | or ebx, eax $sequence_28 = { 50 ff7510 ff5644 8b45fc } // n = 4, score = 100 // 50 | push eax // ff7510 | push dword ptr [ebp + 0x10] // ff5644 | call dword ptr [esi + 0x44] // 8b45fc | mov eax, dword ptr [ebp - 4] $sequence_29 = { 837de8ff 0f8490000000 837d1400 74bf 8b45fc f60010 } // n = 6, score = 100 // 837de8ff | cmp dword ptr [ebp - 0x18], -1 // 0f8490000000 | je 0x96 // 837d1400 | cmp dword ptr [ebp + 0x14], 0 // 74bf | je 0xffffffc1 // 8b45fc | mov eax, dword ptr [ebp - 4] // f60010 | test byte ptr [eax], 0x10 $sequence_30 = { 0bf8 81fb37355e10 0f856afeffff e9???????? 55 8bec } // n = 6, score = 100 // 0bf8 | or edi, eax // 81fb37355e10 | cmp ebx, 0x105e3537 // 0f856afeffff | jne 0xfffffe70 // e9???????? | // 55 | push ebp // 8bec | mov ebp, esp $sequence_31 = { 894508 ff5630 8bd8 ff5638 } // n = 4, score = 100 // 894508 | mov dword ptr [ebp + 8], eax // ff5630 | call dword ptr [esi + 0x30] // 8bd8 | mov ebx, eax // ff5638 | call dword ptr [esi + 0x38] condition: 7 of them and filesize < 204800 }
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