Actor(s): Operation C-Major
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rule win_andromeda_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-11-21" 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 = "20221118" malpedia_hash = "e0702e2e6d1d00da65c8a29a4ebacd0a4c59e1af" malpedia_version = "20221125" 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 = { 368a942900ffffff 02c2 020433 368ab42800ffffff 3688b42900ffffff } // n = 5, 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] // 3688b42900ffffff | mov byte ptr ss:[ecx + ebp - 0x100], dh $sequence_1 = { 55 8bec 81c400ffffff 60 b940000000 8d7dfc b8fcfdfeff } // n = 7, score = 800 // 55 | push ebp // 8bec | mov ebp, esp // 81c400ffffff | add esp, 0xffffff00 // 60 | pushal // b940000000 | mov ecx, 0x40 // 8d7dfc | lea edi, [ebp - 4] // b8fcfdfeff | mov eax, 0xfffefdfc $sequence_2 = { 33c0 33db 33c9 33d2 8b7d10 fec0 } // n = 6, score = 800 // 33c0 | xor eax, eax // 33db | xor ebx, ebx // 33c9 | xor ecx, ecx // 33d2 | xor edx, edx // 8b7d10 | mov edi, dword ptr [ebp + 0x10] // fec0 | inc al $sequence_3 = { ab 2d04040404 e2f8 fc 33c0 } // n = 5, score = 800 // ab | stosd dword ptr es:[edi], eax // 2d04040404 | sub eax, 0x4040404 // e2f8 | loop 0xfffffffa // fc | cld // 33c0 | xor eax, eax $sequence_4 = { 3688b42900ffffff 3688942800ffffff fec1 7408 } // n = 4, score = 800 // 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_5 = { 41 3b4d14 75c3 61 } // n = 4, score = 800 // 41 | inc ecx // 3b4d14 | cmp ecx, dword ptr [ebp + 0x14] // 75c3 | jne 0xffffffc5 // 61 | popal $sequence_6 = { 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_7 = { 368ab42b00ffffff 3688b42800ffffff 3688942b00ffffff 02d6 81e2ff000000 368a942a00ffffff } // n = 6, score = 800 // 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_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 = { 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 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_12 = { 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_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 = { 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 = { 57 6aff ff15???????? a3???????? } // n = 4, score = 300 // 57 | push edi // 6aff | push -1 // ff15???????? | // a3???????? | $sequence_16 = { e8???????? 6a00 ff75f8 ff75fc } // n = 4, score = 200 // e8???????? | // 6a00 | push 0 // ff75f8 | push dword ptr [ebp - 8] // ff75fc | push dword ptr [ebp - 4] $sequence_17 = { 6a00 6a00 ff75f0 e8???????? c7459c44000000 8945d4 } // n = 6, score = 200 // 6a00 | push 0 // 6a00 | push 0 // ff75f0 | push dword ptr [ebp - 0x10] // e8???????? | // c7459c44000000 | mov dword ptr [ebp - 0x64], 0x44 // 8945d4 | mov dword ptr [ebp - 0x2c], eax $sequence_18 = { e8???????? 6a06 ff75f8 e8???????? 8d45f4 50 } // n = 6, score = 200 // e8???????? | // 6a06 | push 6 // ff75f8 | push dword ptr [ebp - 8] // e8???????? | // 8d45f4 | lea eax, [ebp - 0xc] // 50 | push eax $sequence_19 = { 6a06 6a01 6a02 e8???????? 8945f0 83f8ff 7479 } // n = 7, score = 200 // 6a06 | push 6 // 6a01 | push 1 // 6a02 | push 2 // e8???????? | // 8945f0 | mov dword ptr [ebp - 0x10], eax // 83f8ff | cmp eax, -1 // 7479 | je 0x7b $sequence_20 = { e8???????? 668945e2 c745e400000000 6a00 6a00 6a00 6a06 } // n = 7, score = 200 // e8???????? | // 668945e2 | mov word ptr [ebp - 0x1e], ax // c745e400000000 | mov dword ptr [ebp - 0x1c], 0 // 6a00 | push 0 // 6a00 | push 0 // 6a00 | push 0 // 6a06 | push 6 $sequence_21 = { e8???????? a3???????? 6804010000 6a00 } // n = 4, score = 200 // e8???????? | // a3???????? | // 6804010000 | push 0x104 // 6a00 | push 0 $sequence_22 = { 6a00 68???????? 6a00 e8???????? eba9 6a00 e8???????? } // n = 7, score = 200 // 6a00 | push 0 // 68???????? | // 6a00 | push 0 // e8???????? | // eba9 | jmp 0xffffffab // 6a00 | push 0 // e8???????? | $sequence_23 = { ff75f8 68???????? e8???????? 6804010000 ff75fc 6a00 e8???????? } // n = 7, score = 200 // ff75f8 | push dword ptr [ebp - 8] // 68???????? | // e8???????? | // 6804010000 | push 0x104 // ff75fc | push dword ptr [ebp - 4] // 6a00 | push 0 // e8???????? | $sequence_24 = { 2bd1 0fb61402 2bc2 2bc1 c3 55 8bec } // n = 7, score = 100 // 2bd1 | sub edx, ecx // 0fb61402 | movzx edx, byte ptr [edx + eax] // 2bc2 | sub eax, edx // 2bc1 | sub eax, ecx // c3 | ret // 55 | push ebp // 8bec | mov ebp, esp $sequence_25 = { 33d2 3bc2 0f84e8010000 8b45e4 } // n = 4, score = 100 // 33d2 | xor edx, edx // 3bc2 | cmp eax, edx // 0f84e8010000 | je 0x1ee // 8b45e4 | mov eax, dword ptr [ebp - 0x1c] $sequence_26 = { 3b4578 7523 8b456c 8b4018 894560 81c3b6dd7f19 ff5634 } // n = 7, score = 100 // 3b4578 | cmp eax, dword ptr [ebp + 0x78] // 7523 | jne 0x25 // 8b456c | mov eax, dword ptr [ebp + 0x6c] // 8b4018 | mov eax, dword ptr [eax + 0x18] // 894560 | mov dword ptr [ebp + 0x60], eax // 81c3b6dd7f19 | add ebx, 0x197fddb6 // ff5634 | call dword ptr [esi + 0x34] $sequence_27 = { 6af5 ff5630 23d8 ff560c 0faff8 8b456c 8b400c } // n = 7, score = 100 // 6af5 | push -0xb // ff5630 | call dword ptr [esi + 0x30] // 23d8 | and ebx, eax // ff560c | call dword ptr [esi + 0xc] // 0faff8 | imul edi, eax // 8b456c | mov eax, dword ptr [ebp + 0x6c] // 8b400c | mov eax, dword ptr [eax + 0xc] $sequence_28 = { ff560c 81c33462d24b 0bf8 81fb4c3bcb1c 0f8439010000 } // n = 5, score = 100 // ff560c | call dword ptr [esi + 0xc] // 81c33462d24b | add ebx, 0x4bd26234 // 0bf8 | or edi, eax // 81fb4c3bcb1c | cmp ebx, 0x1ccb3b4c // 0f8439010000 | je 0x13f $sequence_29 = { 0faff8 81fb273b1f6e 0f84d4feffff eb2f 8b456c 8b00 89456c } // n = 7, score = 100 // 0faff8 | imul edi, eax // 81fb273b1f6e | cmp ebx, 0x6e1f3b27 // 0f84d4feffff | je 0xfffffeda // eb2f | jmp 0x31 // 8b456c | mov eax, dword ptr [ebp + 0x6c] // 8b00 | mov eax, dword ptr [eax] // 89456c | mov dword ptr [ebp + 0x6c], eax $sequence_30 = { 0145ec ff5624 0bf8 ff5614 33d8 } // n = 5, score = 100 // 0145ec | add dword ptr [ebp - 0x14], eax // ff5624 | call dword ptr [esi + 0x24] // 0bf8 | or edi, eax // ff5614 | call dword ptr [esi + 0x14] // 33d8 | xor ebx, eax $sequence_31 = { 3d798c7899 74cd 8b4560 5f 5e 5b 83c570 } // n = 7, score = 100 // 3d798c7899 | cmp eax, 0x99788c79 // 74cd | je 0xffffffcf // 8b4560 | mov eax, dword ptr [ebp + 0x60] // 5f | pop edi // 5e | pop esi // 5b | pop ebx // 83c570 | add ebp, 0x70 condition: 7 of them and filesize < 204800 }
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