Actor(s): Operation C-Major
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rule win_andromeda_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2020-12-22" version = "1" description = "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 = "20201222" malpedia_hash = "30354d830a29f0fbd3714d93d94dea941d77a130" malpedia_version = "20201023" 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 = { 02c2 020433 368ab42800ffffff 3688b42900ffffff } // n = 4, 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 $sequence_1 = { 3688942b00ffffff 02d6 81e2ff000000 368a942a00ffffff 301439 41 3b4d14 } // n = 7, score = 800 // 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 // 41 | inc ecx // 3b4d14 | cmp ecx, dword ptr [ebp + 0x14] $sequence_2 = { 60 b940000000 8d7dfc b8fcfdfeff } // n = 4, score = 800 // 60 | pushal // b940000000 | mov ecx, 0x40 // 8d7dfc | lea edi, [ebp - 4] // b8fcfdfeff | mov eax, 0xfffefdfc $sequence_3 = { 368a942800ffffff 02da 368ab42b00ffffff 3688b42800ffffff 3688942b00ffffff 02d6 81e2ff000000 } // n = 7, 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 // 81e2ff000000 | and edx, 0xff $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 = { 2d04040404 e2f8 fc 33c0 8b7508 } // n = 5, score = 800 // 2d04040404 | sub eax, 0x4040404 // e2f8 | loop 0xfffffffa // fc | cld // 33c0 | xor eax, eax // 8b7508 | mov esi, dword ptr [ebp + 8] $sequence_6 = { 55 8bec 81c400ffffff 60 } // n = 4, score = 800 // 55 | push ebp // 8bec | mov ebp, esp // 81c400ffffff | add esp, 0xffffff00 // 60 | pushal $sequence_7 = { 43 3b5d0c 74cf ebcf 33c0 } // n = 5, score = 800 // 43 | inc ebx // 3b5d0c | cmp ebx, dword ptr [ebp + 0xc] // 74cf | je 0xffffffd1 // ebcf | jmp 0xffffffd1 // 33c0 | xor eax, eax $sequence_8 = { 60 e8???????? 5d 81ed???????? } // n = 4, score = 700 // 60 | pushal // e8???????? | // 5d | pop ebp // 81ed???????? | $sequence_9 = { 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_10 = { 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_11 = { 50 e8???????? 83c40c 6800000100 e8???????? } // n = 5, score = 400 // 50 | push eax // e8???????? | // 83c40c | add esp, 0xc // 6800000100 | push 0x10000 // e8???????? | $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 = { 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 = { 6a00 6a30 8d45d0 50 6a01 } // n = 5, score = 400 // 6a00 | push 0 // 6a30 | push 0x30 // 8d45d0 | lea eax, [ebp - 0x30] // 50 | push eax // 6a01 | push 1 $sequence_15 = { e8???????? 03f8 8d0437 83ff05 72f0 53 } // n = 6, score = 300 // e8???????? | // 03f8 | add edi, eax // 8d0437 | lea eax, [edi + esi] // 83ff05 | cmp edi, 5 // 72f0 | jb 0xfffffff2 // 53 | push ebx $sequence_16 = { 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_17 = { 83f800 741f 8d45f4 50 } // n = 4, score = 200 // 83f800 | cmp eax, 0 // 741f | je 0x21 // 8d45f4 | lea eax, [ebp - 0xc] // 50 | push eax $sequence_18 = { c745e400000000 6a00 6a00 6a00 6a06 6a01 6a02 } // n = 7, score = 200 // c745e400000000 | mov dword ptr [ebp - 0x1c], 0 // 6a00 | push 0 // 6a00 | push 0 // 6a00 | push 0 // 6a06 | push 6 // 6a01 | push 1 // 6a02 | push 2 $sequence_19 = { ff75f4 e8???????? 68???????? 6801010000 e8???????? } // n = 5, score = 200 // ff75f4 | push dword ptr [ebp - 0xc] // e8???????? | // 68???????? | // 6801010000 | push 0x101 // e8???????? | $sequence_20 = { ff35???????? e8???????? 8945fc 83f800 0f8476010000 } // n = 5, score = 200 // ff35???????? | // e8???????? | // 8945fc | mov dword ptr [ebp - 4], eax // 83f800 | cmp eax, 0 // 0f8476010000 | je 0x17c $sequence_21 = { e8???????? 8945f8 83f800 0f8458010000 6804010000 ff75f8 } // n = 6, score = 200 // 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_22 = { ff75f0 e8???????? 83f8ff 7457 33c0 8d7d9c } // n = 6, score = 200 // ff75f0 | push dword ptr [ebp - 0x10] // e8???????? | // 83f8ff | cmp eax, -1 // 7457 | je 0x59 // 33c0 | xor eax, eax // 8d7d9c | lea edi, [ebp - 0x64] $sequence_23 = { 6801010000 e8???????? 66c745e00200 68401f0000 e8???????? 668945e2 c745e400000000 } // n = 7, score = 200 // 6801010000 | push 0x101 // e8???????? | // 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_24 = { 50 ff5650 ff5624 8d9c031c04b7d8 ff5638 } // n = 5, score = 100 // 50 | push eax // ff5650 | call dword ptr [esi + 0x50] // ff5624 | call dword ptr [esi + 0x24] // 8d9c031c04b7d8 | lea ebx, [ebx + eax - 0x2748fbe4] // ff5638 | call dword ptr [esi + 0x38] $sequence_25 = { ff5624 03f8 81fb2a5fb9e2 0f85d1fdffff e9???????? } // n = 5, score = 100 // ff5624 | call dword ptr [esi + 0x24] // 03f8 | add edi, eax // 81fb2a5fb9e2 | cmp ebx, 0xe2b95f2a // 0f85d1fdffff | jne 0xfffffdd7 // e9???????? | $sequence_26 = { 3d567d5ba4 7526 ff5638 0faff8 81cbbe5b7127 ebe6 8b4df4 } // n = 7, score = 100 // 3d567d5ba4 | cmp eax, 0xa45b7d56 // 7526 | jne 0x28 // ff5638 | call dword ptr [esi + 0x38] // 0faff8 | imul edi, eax // 81cbbe5b7127 | or ebx, 0x27715bbe // ebe6 | jmp 0xffffffe8 // 8b4df4 | mov ecx, dword ptr [ebp - 0xc] $sequence_27 = { 8b45e4 8b5878 81e70a84e4aa 81f6b13a8931 035d08 } // n = 5, score = 100 // 8b45e4 | mov eax, dword ptr [ebp - 0x1c] // 8b5878 | mov ebx, dword ptr [eax + 0x78] // 81e70a84e4aa | and edi, 0xaae4840a // 81f6b13a8931 | xor esi, 0x31893ab1 // 035d08 | add ebx, dword ptr [ebp + 8] $sequence_28 = { 8801 ff560c 6af5 33d8 ff5630 25eeb8dfb9 23f8 } // n = 7, score = 100 // 8801 | mov byte ptr [ecx], al // ff560c | call dword ptr [esi + 0xc] // 6af5 | push -0xb // 33d8 | xor ebx, eax // ff5630 | call dword ptr [esi + 0x30] // 25eeb8dfb9 | and eax, 0xb9dfb8ee // 23f8 | and edi, eax $sequence_29 = { ff5638 03d8 837df000 0f85b7fcffff e9???????? } // n = 5, score = 100 // ff5638 | call dword ptr [esi + 0x38] // 03d8 | add ebx, eax // 837df000 | cmp dword ptr [ebp - 0x10], 0 // 0f85b7fcffff | jne 0xfffffcbd // e9???????? | $sequence_30 = { ff560c 0fafc7 89450c 8b45f0 3145fc ff5614 0faf450c } // n = 7, score = 100 // 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] // 0faf450c | imul eax, dword ptr [ebp + 0xc] $sequence_31 = { 23d8 ff560c 0faff8 8b456c 8b00 } // n = 5, score = 100 // 23d8 | and ebx, eax // ff560c | call dword ptr [esi + 0xc] // 0faff8 | imul edi, eax // 8b456c | mov eax, dword ptr [ebp + 0x6c] // 8b00 | mov eax, dword ptr [eax] condition: 7 of them and filesize < 204800 }
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