Actor(s): Operation C-Major
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rule win_andromeda_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2019-07-05" version = "1" description = "autogenerated rule brought to you by yara-signator" tool = "yara-signator 0.2a" malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.andromeda" malpedia_version = "20190620" 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 / approach 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 = { 43 3b5d0c 74?? eb?? 33c0 } // n = 5, score = 800 // 43 | inc ebx // 3b5d0c | cmp ebx, dword ptr [ebp + 0xc] // 74?? | // eb?? | // 33c0 | xor eax, eax $sequence_1 = { 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_2 = { 02c2 020433 368ab42800ffffff 3688b42900ffffff 3688942800ffffff } // n = 5, score = 800 // 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 $sequence_3 = { 3688b42800ffffff 3688942b00ffffff 02d6 81e2ff000000 368a942a00ffffff 301439 } // n = 6, 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 // 368a942a00ffffff | mov dl, byte ptr ss:[edx + ebp - 0x100] // 301439 | xor byte ptr [ecx + edi], dl $sequence_4 = { 81c400ffffff 60 b940000000 8d7dfc b8fcfdfeff fd ab } // n = 7, score = 800 // 81c400ffffff | add esp, 0xffffff00 // 60 | pushal // b940000000 | mov ecx, 0x40 // 8d7dfc | lea edi, [ebp - 4] // b8fcfdfeff | mov eax, 0xfffefdfc // fd | std // ab | stosd dword ptr es:[edi], eax $sequence_5 = { 33c0 8b7508 33db 368a942900ffffff 02c2 020433 } // n = 6, score = 800 // 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 // 020433 | add al, byte ptr [ebx + esi] $sequence_6 = { 81e2ff000000 368a942a00ffffff 301439 41 } // n = 4, score = 800 // 81e2ff000000 | and edx, 0xff // 368a942a00ffffff | mov dl, byte ptr ss:[edx + ebp - 0x100] // 301439 | xor byte ptr [ecx + edi], dl // 41 | inc ecx $sequence_7 = { 3688b42800ffffff 3688942b00ffffff 02d6 81e2ff000000 368a942a00ffffff } // n = 5, 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 // 368a942a00ffffff | mov dl, byte ptr ss:[edx + ebp - 0x100] $sequence_8 = { 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_9 = { 75?? 0fb64601 84c0 79?? 0d00ffffff } // n = 5, score = 400 // 75?? | // 0fb64601 | movzx eax, byte ptr [esi + 1] // 84c0 | test al, al // 79?? | // 0d00ffffff | or eax, 0xffffff00 $sequence_10 = { 0f9ec1 33d2 3c41 0f9dc2 } // n = 4, score = 400 // 0f9ec1 | setle cl // 33d2 | xor edx, edx // 3c41 | cmp al, 0x41 // 0f9dc2 | setge dl $sequence_11 = { 8a06 33c9 3c5a 0f9ec1 33d2 3c41 0f9dc2 } // n = 7, 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 // 0f9dc2 | setge dl $sequence_12 = { 33d2 3c41 0f9dc2 85ca } // n = 4, score = 400 // 33d2 | xor edx, edx // 3c41 | cmp al, 0x41 // 0f9dc2 | setge dl // 85ca | test edx, ecx $sequence_13 = { 3c41 0f9dc2 85ca 74?? 0420 8806 } // n = 6, score = 400 // 3c41 | cmp al, 0x41 // 0f9dc2 | setge dl // 85ca | test edx, ecx // 74?? | // 0420 | add al, 0x20 // 8806 | mov byte ptr [esi], al $sequence_14 = { 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_15 = { 33d2 3c41 0f9dc2 85ca 74?? } // n = 5, score = 400 // 33d2 | xor edx, edx // 3c41 | cmp al, 0x41 // 0f9dc2 | setge dl // 85ca | test edx, ecx // 74?? | $sequence_16 = { 6a02 e8???????? 8945f0 83f8ff 74?? } // n = 5, score = 300 // 6a02 | push 2 // e8???????? | // 8945f0 | mov dword ptr [ebp - 0x10], eax // 83f8ff | cmp eax, -1 // 74?? | $sequence_17 = { e8???????? c7459c44000000 8945d4 8945d8 8945dc } // n = 5, score = 200 // 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 $sequence_18 = { 66c745e00200 68401f0000 e8???????? 668945e2 c745e400000000 } // n = 5, score = 200 // 66c745e00200 | mov word ptr [ebp - 0x20], 2 // 68401f0000 | push 0x1f40 // e8???????? | // 668945e2 | mov word ptr [ebp - 0x1e], ax // c745e400000000 | mov dword ptr [ebp - 0x1c], 0 $sequence_19 = { 6a05 ff75f0 e8???????? 83f8ff 74?? } // n = 5, score = 200 // 6a05 | push 5 // ff75f0 | push dword ptr [ebp - 0x10] // e8???????? | // 83f8ff | cmp eax, -1 // 74?? | $sequence_20 = { 66c745cc0000 c745c801010000 8d458c 50 8d459c } // n = 5, score = 200 // 66c745cc0000 | mov word ptr [ebp - 0x34], 0 // c745c801010000 | mov dword ptr [ebp - 0x38], 0x101 // 8d458c | lea eax, [ebp - 0x74] // 50 | push eax // 8d459c | lea eax, [ebp - 0x64] $sequence_21 = { e8???????? 6a06 ff75f8 e8???????? 8d45f4 50 6806000200 } // n = 7, score = 200 // e8???????? | // 6a06 | push 6 // ff75f8 | push dword ptr [ebp - 8] // e8???????? | // 8d45f4 | lea eax, [ebp - 0xc] // 50 | push eax // 6806000200 | push 0x20006 $sequence_22 = { 68401f0000 e8???????? 668945e2 c745e400000000 6a00 6a00 6a00 } // n = 7, score = 200 // 68401f0000 | push 0x1f40 // e8???????? | // 668945e2 | mov word ptr [ebp - 0x1e], ax // c745e400000000 | mov dword ptr [ebp - 0x1c], 0 // 6a00 | push 0 // 6a00 | push 0 // 6a00 | push 0 $sequence_23 = { ff75f8 e8???????? 8d45f4 50 6806000200 6a00 } // n = 6, score = 200 // ff75f8 | push dword ptr [ebp - 8] // e8???????? | // 8d45f4 | lea eax, [ebp - 0xc] // 50 | push eax // 6806000200 | push 0x20006 // 6a00 | push 0 $sequence_24 = { 69db055a877b 03c1 81f736424904 894514 81cfc88ca632 ff5638 } // n = 6, score = 100 // 69db055a877b | imul ebx, ebx, 0x7b875a05 // 03c1 | add eax, ecx // 81f736424904 | xor edi, 0x4494236 // 894514 | mov dword ptr [ebp + 0x14], eax // 81cfc88ca632 | or edi, 0x32a68cc8 // ff5638 | call dword ptr [esi + 0x38] $sequence_25 = { 8b401c 81e32a861356 81f71b1ccc93 81f3db50ed3e 8945ec 81ff7185baee } // n = 6, score = 100 // 8b401c | mov eax, dword ptr [eax + 0x1c] // 81e32a861356 | and ebx, 0x5613862a // 81f71b1ccc93 | xor edi, 0x93cc1c1b // 81f3db50ed3e | xor ebx, 0x3eed50db // 8945ec | mov dword ptr [ebp - 0x14], eax // 81ff7185baee | cmp edi, 0xeeba8571 $sequence_26 = { ff5614 0fafd8 56 6a00 ff7510 } // n = 5, score = 100 // ff5614 | call dword ptr [esi + 0x14] // 0fafd8 | imul ebx, eax // 56 | push esi // 6a00 | push 0 // ff7510 | push dword ptr [ebp + 0x10] $sequence_27 = { 81c727a0f047 ff560c 03d8 837df800 } // n = 4, score = 100 // 81c727a0f047 | add edi, 0x47f0a027 // ff560c | call dword ptr [esi + 0xc] // 03d8 | add ebx, eax // 837df800 | cmp dword ptr [ebp - 8], 0 $sequence_28 = { 6a00 ff750c ff5608 81f7a942fbde } // n = 4, score = 100 // 6a00 | push 0 // ff750c | push dword ptr [ebp + 0xc] // ff5608 | call dword ptr [esi + 8] // 81f7a942fbde | xor edi, 0xdefb42a9 $sequence_29 = { 8b7d08 ff5614 094508 ff5624 23d8 81e700f0ffff } // n = 6, score = 100 // 8b7d08 | mov edi, dword ptr [ebp + 8] // ff5614 | call dword ptr [esi + 0x14] // 094508 | or dword ptr [ebp + 8], eax // ff5624 | call dword ptr [esi + 0x24] // 23d8 | and ebx, eax // 81e700f0ffff | and edi, 0xfffff000 $sequence_30 = { 74?? e8???????? 0594104000 50 ff7510 ff5644 8b45fc } // n = 7, score = 100 // 74?? | // e8???????? | // 0594104000 | add eax, 0x401094 // 50 | push eax // ff7510 | push dword ptr [ebp + 0x10] // ff5644 | call dword ptr [esi + 0x44] // 8b45fc | mov eax, dword ptr [ebp - 4] $sequence_31 = { 8b45f0 0fb600 8945f8 ff5614 8b4df0 23d8 } // n = 6, score = 100 // 8b45f0 | mov eax, dword ptr [ebp - 0x10] // 0fb600 | movzx eax, byte ptr [eax] // 8945f8 | mov dword ptr [ebp - 8], eax // ff5614 | call dword ptr [esi + 0x14] // 8b4df0 | mov ecx, dword ptr [ebp - 0x10] // 23d8 | and ebx, eax condition: 7 of them }
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