Actor(s): Equation Group
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rule win_darkpulsar_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" version = "1" description = "Detects win.darkpulsar." 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.darkpulsar" malpedia_rule_date = "20230705" malpedia_hash = "42d0574f4405bd7d2b154d321d345acb18834a41" malpedia_version = "20230715" 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 = { c21000 ff25???????? ff25???????? ff25???????? 33c0 } // n = 5, score = 600 // c21000 | ret 0x10 // ff25???????? | // ff25???????? | // ff25???????? | // 33c0 | xor eax, eax $sequence_1 = { ff25???????? 33c0 40 c20c00 68???????? 64ff3500000000 8b442410 } // n = 7, score = 600 // ff25???????? | // 33c0 | xor eax, eax // 40 | inc eax // c20c00 | ret 0xc // 68???????? | // 64ff3500000000 | push dword ptr fs:[0] // 8b442410 | mov eax, dword ptr [esp + 0x10] $sequence_2 = { 3a01 1bc0 83e0fe 40 } // n = 4, score = 400 // 3a01 | cmp al, byte ptr [ecx] // 1bc0 | sbb eax, eax // 83e0fe | and eax, 0xfffffffe // 40 | inc eax $sequence_3 = { 56 8b35???????? 57 8b7d08 eb09 803f00 742e } // n = 7, score = 300 // 56 | push esi // 8b35???????? | // 57 | push edi // 8b7d08 | mov edi, dword ptr [ebp + 8] // eb09 | jmp 0xb // 803f00 | cmp byte ptr [edi], 0 // 742e | je 0x30 $sequence_4 = { 0fbe07 50 ffd6 8bd8 8b450c 0fbe00 } // n = 6, score = 300 // 0fbe07 | movsx eax, byte ptr [edi] // 50 | push eax // ffd6 | call esi // 8bd8 | mov ebx, eax // 8b450c | mov eax, dword ptr [ebp + 0xc] // 0fbe00 | movsx eax, byte ptr [eax] $sequence_5 = { 74e0 0fb607 8b4d0c 3a01 } // n = 4, score = 300 // 74e0 | je 0xffffffe2 // 0fb607 | movzx eax, byte ptr [edi] // 8b4d0c | mov ecx, dword ptr [ebp + 0xc] // 3a01 | cmp al, byte ptr [ecx] $sequence_6 = { 742e 47 ff450c 0fbe07 } // n = 4, score = 300 // 742e | je 0x30 // 47 | inc edi // ff450c | inc dword ptr [ebp + 0xc] // 0fbe07 | movsx eax, byte ptr [edi] $sequence_7 = { 8b450c 0fbe00 50 ffd6 } // n = 4, score = 300 // 8b450c | mov eax, dword ptr [ebp + 0xc] // 0fbe00 | movsx eax, byte ptr [eax] // 50 | push eax // ffd6 | call esi $sequence_8 = { eb03 83c8ff 5f 5e c3 56 } // n = 6, score = 200 // eb03 | jmp 5 // 83c8ff | or eax, 0xffffffff // 5f | pop edi // 5e | pop esi // c3 | ret // 56 | push esi $sequence_9 = { f7d8 59 1bc0 59 40 c3 e9???????? } // n = 7, score = 200 // f7d8 | neg eax // 59 | pop ecx // 1bc0 | sbb eax, eax // 59 | pop ecx // 40 | inc eax // c3 | ret // e9???????? | $sequence_10 = { 6a01 ff15???????? 8bf0 59 59 3bf7 } // n = 6, score = 200 // 6a01 | push 1 // ff15???????? | // 8bf0 | mov esi, eax // 59 | pop ecx // 59 | pop ecx // 3bf7 | cmp esi, edi $sequence_11 = { 8bc1 c3 8b442404 85c0 7501 c3 } // n = 6, score = 200 // 8bc1 | mov eax, ecx // c3 | ret // 8b442404 | mov eax, dword ptr [esp + 4] // 85c0 | test eax, eax // 7501 | jne 3 // c3 | ret $sequence_12 = { c9 c3 56 8b742408 85f6 7412 } // n = 6, score = 200 // c9 | leave // c3 | ret // 56 | push esi // 8b742408 | mov esi, dword ptr [esp + 8] // 85f6 | test esi, esi // 7412 | je 0x14 $sequence_13 = { 8bf0 46 56 ff15???????? 59 59 } // n = 6, score = 200 // 8bf0 | mov esi, eax // 46 | inc esi // 56 | push esi // ff15???????? | // 59 | pop ecx // 59 | pop ecx $sequence_14 = { ff7608 ff36 e8???????? 8bf8 } // n = 4, score = 200 // ff7608 | push dword ptr [esi + 8] // ff36 | push dword ptr [esi] // e8???????? | // 8bf8 | mov edi, eax $sequence_15 = { e8???????? ff7514 89460c e8???????? } // n = 4, score = 200 // e8???????? | // ff7514 | push dword ptr [ebp + 0x14] // 89460c | mov dword ptr [esi + 0xc], eax // e8???????? | $sequence_16 = { 8d4601 6a01 50 ff15???????? 8bf8 } // n = 5, score = 200 // 8d4601 | lea eax, [esi + 1] // 6a01 | push 1 // 50 | push eax // ff15???????? | // 8bf8 | mov edi, eax $sequence_17 = { 56 e8???????? ff742414 50 } // n = 4, score = 200 // 56 | push esi // e8???????? | // ff742414 | push dword ptr [esp + 0x14] // 50 | push eax $sequence_18 = { 53 33d2 56 57 33c0 } // n = 5, score = 200 // 53 | push ebx // 33d2 | xor edx, edx // 56 | push esi // 57 | push edi // 33c0 | xor eax, eax $sequence_19 = { 33c0 33d2 c3 8bff 55 8bec b863736de0 } // n = 7, score = 200 // 33c0 | xor eax, eax // 33d2 | xor edx, edx // c3 | ret // 8bff | mov edi, edi // 55 | push ebp // 8bec | mov ebp, esp // b863736de0 | mov eax, 0xe06d7363 $sequence_20 = { 8d45cc 50 57 e8???????? 83c410 85c0 } // n = 6, score = 200 // 8d45cc | lea eax, [ebp - 0x34] // 50 | push eax // 57 | push edi // e8???????? | // 83c410 | add esp, 0x10 // 85c0 | test eax, eax $sequence_21 = { 8b5d10 56 8b7508 33d2 } // n = 4, score = 200 // 8b5d10 | mov ebx, dword ptr [ebp + 0x10] // 56 | push esi // 8b7508 | mov esi, dword ptr [ebp + 8] // 33d2 | xor edx, edx $sequence_22 = { 8bd8 53 e8???????? 83c410 85c0 750c } // n = 6, score = 200 // 8bd8 | mov ebx, eax // 53 | push ebx // e8???????? | // 83c410 | add esp, 0x10 // 85c0 | test eax, eax // 750c | jne 0xe $sequence_23 = { 33c9 83c410 83f8ff 0f95c1 49 } // n = 5, score = 200 // 33c9 | xor ecx, ecx // 83c410 | add esp, 0x10 // 83f8ff | cmp eax, -1 // 0f95c1 | setne cl // 49 | dec ecx $sequence_24 = { ffd6 59 59 8945f8 85c0 } // n = 5, score = 200 // ffd6 | call esi // 59 | pop ecx // 59 | pop ecx // 8945f8 | mov dword ptr [ebp - 8], eax // 85c0 | test eax, eax $sequence_25 = { e8???????? 59 5e 83f8ff } // n = 4, score = 200 // e8???????? | // 59 | pop ecx // 5e | pop esi // 83f8ff | cmp eax, -1 $sequence_26 = { ff75fc ff75f4 e8???????? 59 59 83f8ff } // n = 6, score = 200 // ff75fc | push dword ptr [ebp - 4] // ff75f4 | push dword ptr [ebp - 0xc] // e8???????? | // 59 | pop ecx // 59 | pop ecx // 83f8ff | cmp eax, -1 $sequence_27 = { ffd7 59 5f 5e c3 8b4c2404 85c9 } // n = 7, score = 200 // ffd7 | call edi // 59 | pop ecx // 5f | pop edi // 5e | pop esi // c3 | ret // 8b4c2404 | mov ecx, dword ptr [esp + 4] // 85c9 | test ecx, ecx $sequence_28 = { 00db 7313 752f 3b742404 0f830b010000 } // n = 5, score = 100 // 00db | add bl, bl // 7313 | jae 0x15 // 752f | jne 0x31 // 3b742404 | cmp esi, dword ptr [esp + 4] // 0f830b010000 | jae 0x111 $sequence_29 = { 8d45e0 50 8d45ec 50 ff7508 c745e010000000 ff15???????? } // n = 7, score = 100 // 8d45e0 | lea eax, [ebp - 0x20] // 50 | push eax // 8d45ec | lea eax, [ebp - 0x14] // 50 | push eax // ff7508 | push dword ptr [ebp + 8] // c745e010000000 | mov dword ptr [ebp - 0x20], 0x10 // ff15???????? | $sequence_30 = { 00db 73e1 7511 3b742404 } // n = 4, score = 100 // 00db | add bl, bl // 73e1 | jae 0xffffffe3 // 7511 | jne 0x13 // 3b742404 | cmp esi, dword ptr [esp + 4] $sequence_31 = { 741c 837d0c07 7416 ff7518 57 56 } // n = 6, score = 100 // 741c | je 0x1e // 837d0c07 | cmp dword ptr [ebp + 0xc], 7 // 7416 | je 0x18 // ff7518 | push dword ptr [ebp + 0x18] // 57 | push edi // 56 | push esi $sequence_32 = { 8945fc 6a00 6874010000 8d8588feffff 50 ff7508 ff15???????? } // n = 7, score = 100 // 8945fc | mov dword ptr [ebp - 4], eax // 6a00 | push 0 // 6874010000 | push 0x174 // 8d8588feffff | lea eax, [ebp - 0x178] // 50 | push eax // ff7508 | push dword ptr [ebp + 8] // ff15???????? | $sequence_33 = { 68???????? 68???????? ebd7 55 } // n = 4, score = 100 // 68???????? | // 68???????? | // ebd7 | jmp 0xffffffd9 // 55 | push ebp $sequence_34 = { 00db 7313 75e1 3b742404 0f8318010000 } // n = 5, score = 100 // 00db | add bl, bl // 7313 | jae 0x15 // 75e1 | jne 0xffffffe3 // 3b742404 | cmp esi, dword ptr [esp + 4] // 0f8318010000 | jae 0x11e $sequence_35 = { 33ed 33f6 33ff 8b442414 } // n = 4, score = 100 // 33ed | xor ebp, ebp // 33f6 | xor esi, esi // 33ff | xor edi, edi // 8b442414 | mov eax, dword ptr [esp + 0x14] $sequence_36 = { 8b550c 8bc1 8b4d08 c780a010000001000000 c700???????? 8988a8100000 } // n = 6, score = 100 // 8b550c | mov edx, dword ptr [ebp + 0xc] // 8bc1 | mov eax, ecx // 8b4d08 | mov ecx, dword ptr [ebp + 8] // c780a010000001000000 | mov dword ptr [eax + 0x10a0], 1 // c700???????? | // 8988a8100000 | mov dword ptr [eax + 0x10a8], ecx $sequence_37 = { 8bec d94508 d95d08 8b4508 5d } // n = 5, score = 100 // 8bec | mov ebp, esp // d94508 | fld dword ptr [ebp + 8] // d95d08 | fstp dword ptr [ebp + 8] // 8b4508 | mov eax, dword ptr [ebp + 8] // 5d | pop ebp $sequence_38 = { 83f83c 0f8252010000 8b868c000000 8b503c } // n = 4, score = 100 // 83f83c | cmp eax, 0x3c // 0f8252010000 | jb 0x158 // 8b868c000000 | mov eax, dword ptr [esi + 0x8c] // 8b503c | mov edx, dword ptr [eax + 0x3c] $sequence_39 = { 83c8ff eb76 56 6a02 58 } // n = 5, score = 100 // 83c8ff | or eax, 0xffffffff // eb76 | jmp 0x78 // 56 | push esi // 6a02 | push 2 // 58 | pop eax $sequence_40 = { e8???????? 83c404 8b852cf4ffff 5f 5e 5b } // n = 6, score = 100 // e8???????? | // 83c404 | add esp, 4 // 8b852cf4ffff | mov eax, dword ptr [ebp - 0xbd4] // 5f | pop edi // 5e | pop esi // 5b | pop ebx $sequence_41 = { e8???????? e9???????? 8b4664 8b4e34 50 51 83c658 } // n = 7, score = 100 // e8???????? | // e9???????? | // 8b4664 | mov eax, dword ptr [esi + 0x64] // 8b4e34 | mov ecx, dword ptr [esi + 0x34] // 50 | push eax // 51 | push ecx // 83c658 | add esi, 0x58 $sequence_42 = { 83ffff 744a 8d45dc 50 57 } // n = 5, score = 100 // 83ffff | cmp edi, -1 // 744a | je 0x4c // 8d45dc | lea eax, [ebp - 0x24] // 50 | push eax // 57 | push edi $sequence_43 = { 8b7d08 33db 6803010000 898d64eeffff 898548eeffff 33c0 8d8df9feffff } // n = 7, score = 100 // 8b7d08 | mov edi, dword ptr [ebp + 8] // 33db | xor ebx, ebx // 6803010000 | push 0x103 // 898d64eeffff | mov dword ptr [ebp - 0x119c], ecx // 898548eeffff | mov dword ptr [ebp - 0x11b8], eax // 33c0 | xor eax, eax // 8d8df9feffff | lea ecx, [ebp - 0x107] $sequence_44 = { 8a45fb 884dfa 8a4dfc 8845fc 8b55fc 884dfb 8b45f8 } // n = 7, score = 100 // 8a45fb | mov al, byte ptr [ebp - 5] // 884dfa | mov byte ptr [ebp - 6], cl // 8a4dfc | mov cl, byte ptr [ebp - 4] // 8845fc | mov byte ptr [ebp - 4], al // 8b55fc | mov edx, dword ptr [ebp - 4] // 884dfb | mov byte ptr [ebp - 5], cl // 8b45f8 | mov eax, dword ptr [ebp - 8] $sequence_45 = { 56 ff15???????? 56 ff15???????? 83c410 5e c3 } // n = 7, score = 100 // 56 | push esi // ff15???????? | // 56 | push esi // ff15???????? | // 83c410 | add esp, 0x10 // 5e | pop esi // c3 | ret $sequence_46 = { ff7510 53 ffd6 53 ffd7 83c410 837d0800 } // n = 7, score = 100 // ff7510 | push dword ptr [ebp + 0x10] // 53 | push ebx // ffd6 | call esi // 53 | push ebx // ffd7 | call edi // 83c410 | add esp, 0x10 // 837d0800 | cmp dword ptr [ebp + 8], 0 $sequence_47 = { 33c0 c3 668b442404 66c1c008 c3 e9???????? 8b4c2404 } // n = 7, score = 100 // 33c0 | xor eax, eax // c3 | ret // 668b442404 | mov ax, word ptr [esp + 4] // 66c1c008 | rol ax, 8 // c3 | ret // e9???????? | // 8b4c2404 | mov ecx, dword ptr [esp + 4] $sequence_48 = { 8945e8 e8???????? 8bf0 83c404 85f6 } // n = 5, score = 100 // 8945e8 | mov dword ptr [ebp - 0x18], eax // e8???????? | // 8bf0 | mov esi, eax // 83c404 | add esp, 4 // 85f6 | test esi, esi $sequence_49 = { e9???????? 8b4c2408 8b442404 8bd1 c1ea08 885001 } // n = 6, score = 100 // e9???????? | // 8b4c2408 | mov ecx, dword ptr [esp + 8] // 8b442404 | mov eax, dword ptr [esp + 4] // 8bd1 | mov edx, ecx // c1ea08 | shr edx, 8 // 885001 | mov byte ptr [eax + 1], dl $sequence_50 = { 00db 7309 75f4 8a1e 46 10db } // n = 6, score = 100 // 00db | add bl, bl // 7309 | jae 0xb // 75f4 | jne 0xfffffff6 // 8a1e | mov bl, byte ptr [esi] // 46 | inc esi // 10db | adc bl, bl condition: 7 of them and filesize < 491520 }
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