Actor(s): Equation Group
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rule win_darkpulsar_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2026-01-05" 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 = "20260105" malpedia_hash = "19b79e7cab4eaf532122e5b45a77dd8f6bb5cc79" malpedia_version = "20251219" 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 40 } // n = 6, score = 600 // c21000 | ret 0x10 // ff25???????? | // ff25???????? | // ff25???????? | // 33c0 | xor eax, eax // 40 | inc eax $sequence_1 = { 33c0 40 c20c00 68???????? 64ff3500000000 } // n = 5, score = 600 // 33c0 | xor eax, eax // 40 | inc eax // c20c00 | ret 0xc // 68???????? | // 64ff3500000000 | push dword ptr fs:[0] $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 = { 8b35???????? 57 8b7d08 eb09 803f00 } // n = 5, score = 300 // 8b35???????? | // 57 | push edi // 8b7d08 | mov edi, dword ptr [ebp + 8] // eb09 | jmp 0xb // 803f00 | cmp byte ptr [edi], 0 $sequence_4 = { ffd6 8bd8 8b450c 0fbe00 50 ffd6 } // n = 6, score = 300 // ffd6 | call esi // 8bd8 | mov ebx, eax // 8b450c | mov eax, dword ptr [ebp + 0xc] // 0fbe00 | movsx eax, byte ptr [eax] // 50 | push eax // ffd6 | call esi $sequence_5 = { ffd6 59 59 3bd8 74e0 } // n = 5, score = 300 // ffd6 | call esi // 59 | pop ecx // 59 | pop ecx // 3bd8 | cmp ebx, eax // 74e0 | je 0xffffffe2 $sequence_6 = { 47 ff450c 0fbe07 50 ffd6 8bd8 8b450c } // n = 7, score = 300 // 47 | inc edi // ff450c | inc dword ptr [ebp + 0xc] // 0fbe07 | movsx eax, byte ptr [edi] // 50 | push eax // ffd6 | call esi // 8bd8 | mov ebx, eax // 8b450c | mov eax, dword ptr [ebp + 0xc] $sequence_7 = { 3bd8 74e0 0fb607 8b4d0c 3a01 } // n = 5, score = 300 // 3bd8 | cmp ebx, eax // 74e0 | je 0xffffffe2 // 0fb607 | movzx eax, byte ptr [edi] // 8b4d0c | mov ecx, dword ptr [ebp + 0xc] // 3a01 | cmp al, byte ptr [ecx] $sequence_8 = { 5e c9 c3 56 8b742408 85f6 7412 } // n = 7, score = 200 // 5e | pop esi // c9 | leave // c3 | ret // 56 | push esi // 8b742408 | mov esi, dword ptr [esp + 8] // 85f6 | test esi, esi // 7412 | je 0x14 $sequence_9 = { 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_10 = { 33d2 56 57 33c0 } // n = 4, score = 200 // 33d2 | xor edx, edx // 56 | push esi // 57 | push edi // 33c0 | xor eax, eax $sequence_11 = { 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_12 = { ffd7 59 5f 5e c3 8b4c2404 } // n = 6, score = 200 // ffd7 | call edi // 59 | pop ecx // 5f | pop edi // 5e | pop esi // c3 | ret // 8b4c2404 | mov ecx, dword ptr [esp + 4] $sequence_13 = { 50 ff7618 ff15???????? 59 59 85c0 } // n = 6, score = 200 // 50 | push eax // ff7618 | push dword ptr [esi + 0x18] // ff15???????? | // 59 | pop ecx // 59 | pop ecx // 85c0 | test eax, eax $sequence_14 = { 8945fc 8b450c 53 8b5d08 56 57 8945e8 } // n = 7, score = 200 // 8945fc | mov dword ptr [ebp - 4], eax // 8b450c | mov eax, dword ptr [ebp + 0xc] // 53 | push ebx // 8b5d08 | mov ebx, dword ptr [ebp + 8] // 56 | push esi // 57 | push edi // 8945e8 | mov dword ptr [ebp - 0x18], eax $sequence_15 = { 83c410 83f8ff 0f95c1 49 8bc1 } // n = 5, score = 200 // 83c410 | add esp, 0x10 // 83f8ff | cmp eax, -1 // 0f95c1 | setne cl // 49 | dec ecx // 8bc1 | mov eax, ecx $sequence_16 = { 59 1bc0 59 40 c3 e9???????? } // n = 6, score = 200 // 59 | pop ecx // 1bc0 | sbb eax, eax // 59 | pop ecx // 40 | inc eax // c3 | ret // e9???????? | $sequence_17 = { 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_18 = { 33d2 c3 8bff 55 8bec b863736de0 } // n = 6, score = 200 // 33d2 | xor edx, edx // c3 | ret // 8bff | mov edi, edi // 55 | push ebp // 8bec | mov ebp, esp // b863736de0 | mov eax, 0xe06d7363 $sequence_19 = { 53 8b5d10 56 8b7508 33d2 } // n = 5, score = 200 // 53 | push ebx // 8b5d10 | mov ebx, dword ptr [ebp + 0x10] // 56 | push esi // 8b7508 | mov esi, dword ptr [ebp + 8] // 33d2 | xor edx, edx $sequence_20 = { 56 e8???????? 59 85c0 7625 } // n = 5, score = 200 // 56 | push esi // e8???????? | // 59 | pop ecx // 85c0 | test eax, eax // 7625 | jbe 0x27 $sequence_21 = { 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_22 = { 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_23 = { 59 5e 8b45fc c9 c3 } // n = 5, score = 200 // 59 | pop ecx // 5e | pop esi // 8b45fc | mov eax, dword ptr [ebp - 4] // c9 | leave // c3 | ret $sequence_24 = { e8???????? 8bf0 46 56 ff15???????? 59 59 } // n = 7, score = 200 // e8???????? | // 8bf0 | mov esi, eax // 46 | inc esi // 56 | push esi // ff15???????? | // 59 | pop ecx // 59 | pop ecx $sequence_25 = { e8???????? 59 5e 83f8ff } // n = 4, score = 200 // e8???????? | // 59 | pop ecx // 5e | pop esi // 83f8ff | cmp eax, -1 $sequence_26 = { 5f 5e c3 8b442404 85c0 7503 } // n = 6, score = 200 // 5f | pop edi // 5e | pop esi // c3 | ret // 8b442404 | mov eax, dword ptr [esp + 4] // 85c0 | test eax, eax // 7503 | jne 5 $sequence_27 = { 56 57 8b7d10 7e05 83c220 eb03 } // n = 6, score = 100 // 56 | push esi // 57 | push edi // 8b7d10 | mov edi, dword ptr [ebp + 0x10] // 7e05 | jle 7 // 83c220 | add edx, 0x20 // eb03 | jmp 5 $sequence_28 = { 6a7f 58 33f6 83e107 46 d3e6 85f0 } // n = 7, score = 100 // 6a7f | push 0x7f // 58 | pop eax // 33f6 | xor esi, esi // 83e107 | and ecx, 7 // 46 | inc esi // d3e6 | shl esi, cl // 85f0 | test eax, esi $sequence_29 = { 8bf8 85ff 750f 50 50 8d45f4 } // n = 6, score = 100 // 8bf8 | mov edi, eax // 85ff | test edi, edi // 750f | jne 0x11 // 50 | push eax // 50 | push eax // 8d45f4 | lea eax, [ebp - 0xc] $sequence_30 = { 50 ffd7 f6450801 5f 7409 56 e8???????? } // n = 7, score = 100 // 50 | push eax // ffd7 | call edi // f6450801 | test byte ptr [ebp + 8], 1 // 5f | pop edi // 7409 | je 0xb // 56 | push esi // e8???????? | $sequence_31 = { 33ff 895dfc 3bc7 7509 8b0b } // n = 5, score = 100 // 33ff | xor edi, edi // 895dfc | mov dword ptr [ebp - 4], ebx // 3bc7 | cmp eax, edi // 7509 | jne 0xb // 8b0b | mov ecx, dword ptr [ebx] $sequence_32 = { e8???????? 83c40c 83f8ff 740e ff75e4 ff15???????? } // n = 6, score = 100 // e8???????? | // 83c40c | add esp, 0xc // 83f8ff | cmp eax, -1 // 740e | je 0x10 // ff75e4 | push dword ptr [ebp - 0x1c] // ff15???????? | $sequence_33 = { eb28 57 8d45f4 56 50 e8???????? } // n = 6, score = 100 // eb28 | jmp 0x2a // 57 | push edi // 8d45f4 | lea eax, [ebp - 0xc] // 56 | push esi // 50 | push eax // e8???????? | $sequence_34 = { ff742410 ff742410 ff15???????? 33c9 } // n = 4, score = 100 // ff742410 | push dword ptr [esp + 0x10] // ff742410 | push dword ptr [esp + 0x10] // ff15???????? | // 33c9 | xor ecx, ecx $sequence_35 = { c20400 8b4508 8b10 8b4008 8d4e08 51 } // n = 6, score = 100 // c20400 | ret 4 // 8b4508 | mov eax, dword ptr [ebp + 8] // 8b10 | mov edx, dword ptr [eax] // 8b4008 | mov eax, dword ptr [eax + 8] // 8d4e08 | lea ecx, [esi + 8] // 51 | push ecx $sequence_36 = { 8b7d08 837f3c04 7405 33c0 5f 5d } // n = 6, score = 100 // 8b7d08 | mov edi, dword ptr [ebp + 8] // 837f3c04 | cmp dword ptr [edi + 0x3c], 4 // 7405 | je 7 // 33c0 | xor eax, eax // 5f | pop edi // 5d | pop ebp $sequence_37 = { 8b7d14 8975f4 3b37 7734 8b750c } // n = 5, score = 100 // 8b7d14 | mov edi, dword ptr [ebp + 0x14] // 8975f4 | mov dword ptr [ebp - 0xc], esi // 3b37 | cmp esi, dword ptr [edi] // 7734 | ja 0x36 // 8b750c | mov esi, dword ptr [ebp + 0xc] $sequence_38 = { ff25???????? c3 8b442404 c705????????00102500 c705????????10102500 } // n = 5, score = 100 // ff25???????? | // c3 | ret // 8b442404 | mov eax, dword ptr [esp + 4] // c705????????00102500 | // c705????????10102500 | $sequence_39 = { 56 ff15???????? 83f8ff 7433 33c0 } // n = 5, score = 100 // 56 | push esi // ff15???????? | // 83f8ff | cmp eax, -1 // 7433 | je 0x35 // 33c0 | xor eax, eax $sequence_40 = { 0f841b010000 3bf0 0f8413010000 394708 0f840a010000 894608 } // n = 6, score = 100 // 0f841b010000 | je 0x121 // 3bf0 | cmp esi, eax // 0f8413010000 | je 0x119 // 394708 | cmp dword ptr [edi + 8], eax // 0f840a010000 | je 0x110 // 894608 | mov dword ptr [esi + 8], eax $sequence_41 = { 8b442408 884101 c1e808 8801 8d4102 } // n = 5, score = 100 // 8b442408 | mov eax, dword ptr [esp + 8] // 884101 | mov byte ptr [ecx + 1], al // c1e808 | shr eax, 8 // 8801 | mov byte ptr [ecx], al // 8d4102 | lea eax, [ecx + 2] $sequence_42 = { ddd9 f6c444 7b09 ddd8 b8???????? eb5b 51 } // n = 7, score = 100 // ddd9 | fstp st(1) // f6c444 | test ah, 0x44 // 7b09 | jnp 0xb // ddd8 | fstp st(0) // b8???????? | // eb5b | jmp 0x5d // 51 | push ecx $sequence_43 = { 33ff 8945f4 8945f8 e8???????? 83c404 8945fc } // n = 6, score = 100 // 33ff | xor edi, edi // 8945f4 | mov dword ptr [ebp - 0xc], eax // 8945f8 | mov dword ptr [ebp - 8], eax // e8???????? | // 83c404 | add esp, 4 // 8945fc | mov dword ptr [ebp - 4], eax $sequence_44 = { 8945fc bacdab0000 8d45f4 52 50 } // n = 5, score = 100 // 8945fc | mov dword ptr [ebp - 4], eax // bacdab0000 | mov edx, 0xabcd // 8d45f4 | lea eax, [ebp - 0xc] // 52 | push edx // 50 | push eax $sequence_45 = { 894588 7404 40 894588 83659800 85c0 0f8610010000 } // n = 7, score = 100 // 894588 | mov dword ptr [ebp - 0x78], eax // 7404 | je 6 // 40 | inc eax // 894588 | mov dword ptr [ebp - 0x78], eax // 83659800 | and dword ptr [ebp - 0x68], 0 // 85c0 | test eax, eax // 0f8610010000 | jbe 0x116 $sequence_46 = { 00db 7309 7515 8a1e } // n = 4, score = 100 // 00db | add bl, bl // 7309 | jae 0xb // 7515 | jne 0x17 // 8a1e | mov bl, byte ptr [esi] $sequence_47 = { 85f6 7425 3b4d10 0f8394010000 8b7514 } // n = 5, score = 100 // 85f6 | test esi, esi // 7425 | je 0x27 // 3b4d10 | cmp ecx, dword ptr [ebp + 0x10] // 0f8394010000 | jae 0x19a // 8b7514 | mov esi, dword ptr [ebp + 0x14] $sequence_48 = { e8???????? dc1d???????? 83c410 dfe0 f6c444 } // n = 5, score = 100 // e8???????? | // dc1d???????? | // 83c410 | add esp, 0x10 // dfe0 | fnstsw ax // f6c444 | test ah, 0x44 condition: 7 of them and filesize < 491520 }
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