Actor(s): Operation C-Major
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rule win_andromeda_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" 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 = "20231130" malpedia_hash = "fc8a0e9f343f6d6ded9e7df1a64dac0cc68d7351" malpedia_version = "20230808" 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 = { 74cf ebcf 33c0 33db 33c9 33d2 8b7d10 } // n = 7, score = 800 // 74cf | je 0xffffffd1 // ebcf | jmp 0xffffffd1 // 33c0 | xor eax, eax // 33db | xor ebx, ebx // 33c9 | xor ecx, ecx // 33d2 | xor edx, edx // 8b7d10 | mov edi, dword ptr [ebp + 0x10] $sequence_1 = { 8b7508 33db 368a942900ffffff 02c2 020433 368ab42800ffffff } // n = 6, score = 800 // 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] // 368ab42800ffffff | mov dh, byte ptr ss:[eax + ebp - 0x100] $sequence_2 = { 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_3 = { 368a942a00ffffff 301439 41 3b4d14 75c3 } // n = 5, score = 800 // 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_4 = { 368ab42800ffffff 3688b42900ffffff 3688942800ffffff fec1 7408 } // n = 5, 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 $sequence_5 = { 368a942800ffffff 02da 368ab42b00ffffff 3688b42800ffffff 3688942b00ffffff } // n = 5, 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 $sequence_6 = { 8d7dfc b8fcfdfeff fd ab 2d04040404 e2f8 fc } // n = 7, score = 800 // 8d7dfc | lea edi, [ebp - 4] // b8fcfdfeff | mov eax, 0xfffefdfc // fd | std // ab | stosd dword ptr es:[edi], eax // 2d04040404 | sub eax, 0x4040404 // e2f8 | loop 0xfffffffa // fc | cld $sequence_7 = { 8bec 81c400ffffff 60 b940000000 8d7dfc b8fcfdfeff } // n = 6, score = 800 // 8bec | mov ebp, esp // 81c400ffffff | add esp, 0xffffff00 // 60 | pushal // b940000000 | mov ecx, 0x40 // 8d7dfc | lea edi, [ebp - 4] // b8fcfdfeff | mov eax, 0xfffefdfc $sequence_8 = { 60 e8???????? 5d 81ed???????? 33c9 } // n = 5, score = 700 // 60 | pushal // e8???????? | // 5d | pop ebp // 81ed???????? | // 33c9 | xor ecx, ecx $sequence_9 = { 3c41 0f9dc2 85ca 7404 0420 8806 } // n = 6, score = 400 // 3c41 | cmp al, 0x41 // 0f9dc2 | setge dl // 85ca | test edx, ecx // 7404 | je 6 // 0420 | add al, 0x20 // 8806 | mov byte ptr [esi], al $sequence_10 = { 50 e8???????? 83c40c 6800000100 e8???????? } // n = 5, score = 400 // 50 | push eax // e8???????? | // 83c40c | add esp, 0xc // 6800000100 | push 0x10000 // e8???????? | $sequence_11 = { 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_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 = { 8d45d0 50 6a01 ff7508 } // n = 4, score = 400 // 8d45d0 | lea eax, [ebp - 0x30] // 50 | push eax // 6a01 | push 1 // ff7508 | push dword ptr [ebp + 8] $sequence_14 = { ff7564 50 6aff 53 56 56 ffd7 } // n = 7, score = 300 // ff7564 | push dword ptr [ebp + 0x64] // 50 | push eax // 6aff | push -1 // 53 | push ebx // 56 | push esi // 56 | push esi // ffd7 | call edi $sequence_15 = { 8b4dfc ff75e4 03c8 51 ff15???????? } // n = 5, score = 300 // 8b4dfc | mov ecx, dword ptr [ebp - 4] // ff75e4 | push dword ptr [ebp - 0x1c] // 03c8 | add ecx, eax // 51 | push ecx // ff15???????? | $sequence_16 = { 68???????? ff75f4 e8???????? ff75f4 e8???????? 68???????? } // n = 6, score = 200 // 68???????? | // ff75f4 | push dword ptr [ebp - 0xc] // e8???????? | // ff75f4 | push dword ptr [ebp - 0xc] // e8???????? | // 68???????? | $sequence_17 = { 6a00 6a06 6a01 6a02 e8???????? 8945f0 83f8ff } // n = 7, score = 200 // 6a00 | push 0 // 6a06 | push 6 // 6a01 | push 1 // 6a02 | push 2 // e8???????? | // 8945f0 | mov dword ptr [ebp - 0x10], eax // 83f8ff | cmp eax, -1 $sequence_18 = { e8???????? 6a06 ff75f8 e8???????? 8d45f4 } // n = 5, score = 200 // e8???????? | // 6a06 | push 6 // ff75f8 | push dword ptr [ebp - 8] // e8???????? | // 8d45f4 | lea eax, [ebp - 0xc] $sequence_19 = { ff75f0 e8???????? c7459c44000000 8945d4 } // n = 4, score = 200 // ff75f0 | push dword ptr [ebp - 0x10] // e8???????? | // c7459c44000000 | mov dword ptr [ebp - 0x64], 0x44 // 8945d4 | mov dword ptr [ebp - 0x2c], eax $sequence_20 = { e8???????? 83f800 7526 ff75f8 e8???????? 40 50 } // n = 7, score = 200 // e8???????? | // 83f800 | cmp eax, 0 // 7526 | jne 0x28 // ff75f8 | push dword ptr [ebp - 8] // e8???????? | // 40 | inc eax // 50 | push eax $sequence_21 = { 83f8ff 7466 6a05 ff75f0 } // n = 4, score = 200 // 83f8ff | cmp eax, -1 // 7466 | je 0x68 // 6a05 | push 5 // ff75f0 | push dword ptr [ebp - 0x10] $sequence_22 = { 6a05 ff75f0 e8???????? 83f8ff 7457 33c0 8d7d9c } // n = 7, score = 200 // 6a05 | push 5 // 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 = { 8945fc 83f800 0f8476010000 6804010000 6a00 ff35???????? e8???????? } // n = 7, score = 200 // 8945fc | mov dword ptr [ebp - 4], eax // 83f800 | cmp eax, 0 // 0f8476010000 | je 0x17c // 6804010000 | push 0x104 // 6a00 | push 0 // ff35???????? | // e8???????? | $sequence_24 = { 314508 ff560c 8b7d04 0bd8 81fbb599839e 7503 } // n = 6, score = 100 // 314508 | xor dword ptr [ebp + 8], eax // ff560c | call dword ptr [esi + 0xc] // 8b7d04 | mov edi, dword ptr [ebp + 4] // 0bd8 | or ebx, eax // 81fbb599839e | cmp ebx, 0x9e8399b5 // 7503 | jne 5 $sequence_25 = { 31450c 315dfc ff5634 31450c 81c75853b2b3 } // n = 5, score = 100 // 31450c | xor dword ptr [ebp + 0xc], eax // 315dfc | xor dword ptr [ebp - 4], ebx // ff5634 | call dword ptr [esi + 0x34] // 31450c | xor dword ptr [ebp + 0xc], eax // 81c75853b2b3 | add edi, 0xb3b25358 $sequence_26 = { 81ef21cfd856 2bd8 81ff1ac8cfd4 0f84ac000000 } // n = 4, score = 100 // 81ef21cfd856 | sub edi, 0x56d8cf21 // 2bd8 | sub ebx, eax // 81ff1ac8cfd4 | cmp edi, 0xd4cfc81a // 0f84ac000000 | je 0xb2 $sequence_27 = { 0f8418010000 8365f000 6850020000 6a08 ff750c ff5604 } // n = 6, score = 100 // 0f8418010000 | je 0x11e // 8365f000 | and dword ptr [ebp - 0x10], 0 // 6850020000 | push 0x250 // 6a08 | push 8 // ff750c | push dword ptr [ebp + 0xc] // ff5604 | call dword ptr [esi + 4] $sequence_28 = { ff560c 0faff8 8b456c 8b00 89456c ff5638 0fafd8 } // n = 7, score = 100 // ff560c | call dword ptr [esi + 0xc] // 0faff8 | imul edi, eax // 8b456c | mov eax, dword ptr [ebp + 0x6c] // 8b00 | mov eax, dword ptr [eax] // 89456c | mov dword ptr [ebp + 0x6c], eax // ff5638 | call dword ptr [esi + 0x38] // 0fafd8 | imul ebx, eax $sequence_29 = { 3d00010000 7322 888405ecfeffff ff560c } // n = 4, score = 100 // 3d00010000 | cmp eax, 0x100 // 7322 | jae 0x24 // 888405ecfeffff | mov byte ptr [ebp + eax - 0x114], al // ff560c | call dword ptr [esi + 0xc] $sequence_30 = { 81fb15af295e 0f85ae000000 81ef52eceb06 ff5634 8bd8 81cb15af295e 8b45fc } // n = 7, score = 100 // 81fb15af295e | cmp ebx, 0x5e29af15 // 0f85ae000000 | jne 0xb4 // 81ef52eceb06 | sub edi, 0x6ebec52 // ff5634 | call dword ptr [esi + 0x34] // 8bd8 | mov ebx, eax // 81cb15af295e | or ebx, 0x5e29af15 // 8b45fc | mov eax, dword ptr [ebp - 4] $sequence_31 = { ff5634 8b4d0c 81c951dbc951 0fafc1 89450c } // n = 5, score = 100 // ff5634 | call dword ptr [esi + 0x34] // 8b4d0c | mov ecx, dword ptr [ebp + 0xc] // 81c951dbc951 | or ecx, 0x51c9db51 // 0fafc1 | imul eax, ecx // 89450c | mov dword ptr [ebp + 0xc], eax condition: 7 of them and filesize < 204800 }
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