Actor(s): Equation Group
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rule win_darkpulsar_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2024-10-31" 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 = "20241030" malpedia_hash = "26e26953c49c8efafbf72a38076855d578e0a2e4" malpedia_version = "20241030" 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 = { 33c0 40 c20c00 68???????? 64ff3500000000 8b442410 896c2410 } // n = 7, score = 600 // 33c0 | xor eax, eax // 40 | inc eax // c20c00 | ret 0xc // 68???????? | // 64ff3500000000 | push dword ptr fs:[0] // 8b442410 | mov eax, dword ptr [esp + 0x10] // 896c2410 | mov dword ptr [esp + 0x10], ebp $sequence_1 = { c21000 ff25???????? ff25???????? ff25???????? 33c0 } // n = 5, score = 600 // c21000 | ret 0x10 // ff25???????? | // ff25???????? | // ff25???????? | // 33c0 | xor eax, eax $sequence_2 = { 3a01 1bc0 83e0fe 40 5f 5e } // n = 6, score = 400 // 3a01 | cmp al, byte ptr [ecx] // 1bc0 | sbb eax, eax // 83e0fe | and eax, 0xfffffffe // 40 | inc eax // 5f | pop edi // 5e | pop esi $sequence_3 = { 59 3bd8 74e0 0fb607 8b4d0c 3a01 } // n = 6, score = 300 // 59 | pop ecx // 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_4 = { 50 ffd6 8bd8 8b450c 0fbe00 50 ffd6 } // n = 7, score = 300 // 50 | push eax // 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 = { 803f00 742e 47 ff450c 0fbe07 } // n = 5, score = 300 // 803f00 | cmp byte ptr [edi], 0 // 742e | je 0x30 // 47 | inc edi // ff450c | inc dword ptr [ebp + 0xc] // 0fbe07 | movsx eax, byte ptr [edi] $sequence_6 = { 50 ffd6 59 59 3bd8 74e0 } // n = 6, score = 300 // 50 | push eax // ffd6 | call esi // 59 | pop ecx // 59 | pop ecx // 3bd8 | cmp ebx, eax // 74e0 | je 0xffffffe2 $sequence_7 = { 56 8b35???????? 57 8b7d08 eb09 } // n = 5, score = 300 // 56 | push esi // 8b35???????? | // 57 | push edi // 8b7d08 | mov edi, dword ptr [ebp + 8] // eb09 | jmp 0xb $sequence_8 = { 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_9 = { e8???????? 59 85c0 7625 } // n = 4, score = 200 // e8???????? | // 59 | pop ecx // 85c0 | test eax, eax // 7625 | jbe 0x27 $sequence_10 = { 33c0 eb03 83c8ff 5f 5e c3 56 } // n = 7, score = 200 // 33c0 | xor eax, eax // eb03 | jmp 5 // 83c8ff | or eax, 0xffffffff // 5f | pop edi // 5e | pop esi // c3 | ret // 56 | push esi $sequence_11 = { 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_12 = { 59 5e 8b45fc c9 } // n = 4, score = 200 // 59 | pop ecx // 5e | pop esi // 8b45fc | mov eax, dword ptr [ebp - 4] // c9 | leave $sequence_13 = { 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_14 = { 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_15 = { 1bc0 59 40 c3 e9???????? } // n = 5, score = 200 // 1bc0 | sbb eax, eax // 59 | pop ecx // 40 | inc eax // c3 | ret // e9???????? | $sequence_16 = { 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_17 = { e8???????? 8bf0 46 56 ff15???????? 59 } // n = 6, score = 200 // e8???????? | // 8bf0 | mov esi, eax // 46 | inc esi // 56 | push esi // ff15???????? | // 59 | pop ecx $sequence_18 = { 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_19 = { 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_20 = { 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_21 = { 56 e8???????? ff742414 50 e8???????? } // n = 5, score = 200 // 56 | push esi // e8???????? | // ff742414 | push dword ptr [esp + 0x14] // 50 | push eax // e8???????? | $sequence_22 = { 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_23 = { 83c410 83f8ff 0f95c1 49 } // n = 4, score = 200 // 83c410 | add esp, 0x10 // 83f8ff | cmp eax, -1 // 0f95c1 | setne cl // 49 | dec ecx $sequence_24 = { 33d2 c3 8bff 55 8bec b863736de0 394508 } // n = 7, score = 200 // 33d2 | xor edx, edx // c3 | ret // 8bff | mov edi, edi // 55 | push ebp // 8bec | mov ebp, esp // b863736de0 | mov eax, 0xe06d7363 // 394508 | cmp dword ptr [ebp + 8], eax $sequence_25 = { 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_26 = { e8???????? 59 5e 83f8ff } // n = 4, score = 200 // e8???????? | // 59 | pop ecx // 5e | pop esi // 83f8ff | cmp eax, -1 $sequence_27 = { 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_28 = { 8b4514 893e 897e04 894608 c7460c7f000000 } // n = 5, score = 100 // 8b4514 | mov eax, dword ptr [ebp + 0x14] // 893e | mov dword ptr [esi], edi // 897e04 | mov dword ptr [esi + 4], edi // 894608 | mov dword ptr [esi + 8], eax // c7460c7f000000 | mov dword ptr [esi + 0xc], 0x7f $sequence_29 = { 8d45f0 50 ff758c e8???????? 0fb606 } // n = 5, score = 100 // 8d45f0 | lea eax, [ebp - 0x10] // 50 | push eax // ff758c | push dword ptr [ebp - 0x74] // e8???????? | // 0fb606 | movzx eax, byte ptr [esi] $sequence_30 = { 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_31 = { 58 8b542408 85d2 7407 } // n = 4, score = 100 // 58 | pop eax // 8b542408 | mov edx, dword ptr [esp + 8] // 85d2 | test edx, edx // 7407 | je 9 $sequence_32 = { 8b4d14 57 894628 894e08 e8???????? } // n = 5, score = 100 // 8b4d14 | mov ecx, dword ptr [ebp + 0x14] // 57 | push edi // 894628 | mov dword ptr [esi + 0x28], eax // 894e08 | mov dword ptr [esi + 8], ecx // e8???????? | $sequence_33 = { 740a b8???????? e9???????? 56 be3412cdab } // n = 5, score = 100 // 740a | je 0xc // b8???????? | // e9???????? | // 56 | push esi // be3412cdab | mov esi, 0xabcd1234 $sequence_34 = { 52 ff5640 85c0 0f8464010000 8b8690000000 } // n = 5, score = 100 // 52 | push edx // ff5640 | call dword ptr [esi + 0x40] // 85c0 | test eax, eax // 0f8464010000 | je 0x16a // 8b8690000000 | mov eax, dword ptr [esi + 0x90] $sequence_35 = { 83f8ff 7446 8d85d8feffff 50 57 e8???????? } // n = 6, score = 100 // 83f8ff | cmp eax, -1 // 7446 | je 0x48 // 8d85d8feffff | lea eax, [ebp - 0x128] // 50 | push eax // 57 | push edi // e8???????? | $sequence_36 = { 6a03 50 e8???????? 83c414 eb19 8b570c } // n = 6, score = 100 // 6a03 | push 3 // 50 | push eax // e8???????? | // 83c414 | add esp, 0x14 // eb19 | jmp 0x1b // 8b570c | mov edx, dword ptr [edi + 0xc] $sequence_37 = { 83c40c 85c0 7409 83f8fc 0f85af000000 8b45e8 } // n = 6, score = 100 // 83c40c | add esp, 0xc // 85c0 | test eax, eax // 7409 | je 0xb // 83f8fc | cmp eax, -4 // 0f85af000000 | jne 0xb5 // 8b45e8 | mov eax, dword ptr [ebp - 0x18] $sequence_38 = { e8???????? 83c40c c3 8b542404 8b4c2408 56 } // n = 6, score = 100 // e8???????? | // 83c40c | add esp, 0xc // c3 | ret // 8b542404 | mov edx, dword ptr [esp + 4] // 8b4c2408 | mov ecx, dword ptr [esp + 8] // 56 | push esi $sequence_39 = { 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_40 = { c1ee08 8b75fc 885001 8bd1 0facf210 c1ee10 885002 } // n = 7, score = 100 // c1ee08 | shr esi, 8 // 8b75fc | mov esi, dword ptr [ebp - 4] // 885001 | mov byte ptr [eax + 1], dl // 8bd1 | mov edx, ecx // 0facf210 | shrd edx, esi, 0x10 // c1ee10 | shr esi, 0x10 // 885002 | mov byte ptr [eax + 2], dl $sequence_41 = { 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_42 = { 8975f8 8975e8 8975d0 8975dc } // n = 4, score = 100 // 8975f8 | mov dword ptr [ebp - 8], esi // 8975e8 | mov dword ptr [ebp - 0x18], esi // 8975d0 | mov dword ptr [ebp - 0x30], esi // 8975dc | mov dword ptr [ebp - 0x24], esi $sequence_43 = { 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 $sequence_44 = { 8b35???????? 33db 53 6a04 8d45dc 50 57 } // n = 7, score = 100 // 8b35???????? | // 33db | xor ebx, ebx // 53 | push ebx // 6a04 | push 4 // 8d45dc | lea eax, [ebp - 0x24] // 50 | push eax // 57 | push edi $sequence_45 = { 50 ff7508 ff15???????? 83f8ff 741f 56 } // n = 6, score = 100 // 50 | push eax // ff7508 | push dword ptr [ebp + 8] // ff15???????? | // 83f8ff | cmp eax, -1 // 741f | je 0x21 // 56 | push esi $sequence_46 = { 8bf0 59 59 85f6 7423 ff75f0 } // n = 6, score = 100 // 8bf0 | mov esi, eax // 59 | pop ecx // 59 | pop ecx // 85f6 | test esi, esi // 7423 | je 0x25 // ff75f0 | push dword ptr [ebp - 0x10] $sequence_47 = { 33c0 83c008 57 8b7d10 50 8907 894704 } // n = 7, score = 100 // 33c0 | xor eax, eax // 83c008 | add eax, 8 // 57 | push edi // 8b7d10 | mov edi, dword ptr [ebp + 0x10] // 50 | push eax // 8907 | mov dword ptr [edi], eax // 894704 | mov dword ptr [edi + 4], eax $sequence_48 = { 50 52 ff5624 85c0 0f84d2010000 31c0 50 } // n = 7, score = 100 // 50 | push eax // 52 | push edx // ff5624 | call dword ptr [esi + 0x24] // 85c0 | test eax, eax // 0f84d2010000 | je 0x1d8 // 31c0 | xor eax, eax // 50 | push eax $sequence_49 = { 660fb64901 66c1e008 660bc1 c3 } // n = 4, score = 100 // 660fb64901 | movzx cx, byte ptr [ecx + 1] // 66c1e008 | shl ax, 8 // 660bc1 | or ax, cx // c3 | ret $sequence_50 = { 51 d91c24 e8???????? 50 e8???????? d905???????? } // n = 6, score = 100 // 51 | push ecx // d91c24 | fstp dword ptr [esp] // e8???????? | // 50 | push eax // e8???????? | // d905???????? | condition: 7 of them and filesize < 491520 }
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