Actor(s): Turla Group
There is no description at this point.
rule win_skipper_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2020-05-30" version = "1" description = "autogenerated rule brought to you by yara-signator" tool = "yara-signator v0.4.0" tool_config = "callsandjumps;datarefs;binvalue" malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.skipper" malpedia_rule_date = "20200529" malpedia_hash = "92c362319514e5a6da26204961446caa3a8b32a8" malpedia_version = "20200529" malpedia_license = "CC BY-NC-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 / approach 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 = { 6a00 6a03 68???????? 68???????? 6a50 } // n = 5, score = 600 // // 6a03 | push 3 // 68???????? | // 68???????? | // 6a50 | push 0x50 $sequence_1 = { 59 5d c3 55 8bec 33c0 50 } // n = 7, score = 500 // 59 | pop ecx // 5d | pop ebp // c3 | ret // 55 | push ebp // 8bec | mov ebp, esp // 33c0 | xor eax, eax // 50 | push eax $sequence_2 = { ff15???????? 6a00 6a00 6a00 6a00 50 ff15???????? } // n = 7, score = 500 // ff15???????? | // 6a00 | push 0 // 6a00 | push 0 // 6a00 | push 0 // 6a00 | push 0 // 50 | push eax // ff15???????? | $sequence_3 = { 6804010000 e8???????? 6804010000 8bf8 6a00 57 } // n = 6, score = 500 // 6804010000 | push 0x104 // e8???????? | // 6804010000 | push 0x104 // 8bf8 | mov edi, eax // 6a00 | push 0 // 57 | push edi $sequence_4 = { 33c0 40 5f 5e 5d c3 8325????????00 } // n = 7, score = 400 // 33c0 | push edi // 40 | push 0 // 5f | push 0 // 5e | push 0 // 5d | push 0 // c3 | push 0x104 // 8325????????00 | $sequence_5 = { 895104 c9 c3 55 8bec 83ec10 eb0d } // n = 7, score = 400 // 895104 | push 0x104 // c9 | push 0x104 // c3 | mov edi, eax // 55 | push 0 // 8bec | push edi // 83ec10 | push 0 // eb0d | push 0 $sequence_6 = { 56 57 ff15???????? 6804010000 6a00 57 } // n = 6, score = 400 // 56 | push 0x104 // 57 | mov edi, eax // ff15???????? | // 6804010000 | push 0 // 6a00 | push 0x104 // 57 | push 0x104 $sequence_7 = { e8???????? 68???????? 6804010000 53 e8???????? } // n = 5, score = 300 // e8???????? | // 68???????? | // 6804010000 | push 0x104 // 53 | push ebx // e8???????? | $sequence_8 = { 53 e8???????? 6804010000 e8???????? } // n = 4, score = 300 // 53 | push ebx // e8???????? | // 6804010000 | push 0x104 // e8???????? | $sequence_9 = { 6800308000 6a00 6a00 68???????? } // n = 4, score = 300 // 6800308000 | push 0x803000 // 6a00 | push 0 // 6a00 | push 0 // 68???????? | $sequence_10 = { e8???????? 83c404 6a00 6a64 52 } // n = 5, score = 300 // e8???????? | // 83c404 | push 0 // 6a00 | push edi // 6a64 | push 0x104 // 52 | push 0x104 $sequence_11 = { 4181c800ffffff 41ffc0 410fb6c0 488d1424 41ffc1 4803d0 } // n = 6, score = 200 // 4181c800ffffff | inc edx // 41ffc0 | movzx eax, cl // 410fb6c0 | dec esp // 488d1424 | lea eax, [esp] // 41ffc1 | dec eax // 4803d0 | lea edx, [esp] $sequence_12 = { 6a0b 68???????? 8b15???????? 52 68???????? e8???????? } // n = 6, score = 200 // 6a0b | push 0 // 68???????? | // 8b15???????? | // 52 | push 0 // 68???????? | // e8???????? | $sequence_13 = { 4833c4 4889842400010000 4c8b9c2440010000 33c9 4963e9 498bf8 } // n = 6, score = 200 // 4833c4 | or edx, 0xffffff00 // 4889842400010000 | dec ecx // 4c8b9c2440010000 | sub edi, ebx // 33c9 | inc ecx // 4963e9 | and ecx, 0x800000ff // 498bf8 | jge 0x17 $sequence_14 = { 81bde0feffff00010000 0f8d84000000 8b8de0feffff 0fb68c0df0feffff } // n = 4, score = 200 // 81bde0feffff00010000 | push 0x104 // 0f8d84000000 | mov edi, eax // 8b8de0feffff | push 0x104 // 0fb68c0df0feffff | push 0x104 $sequence_15 = { 488d1424 41ffc1 4803d0 48ffc3 0fb602 8843ff 408832 } // n = 7, score = 200 // 488d1424 | push 0 // 41ffc1 | push 0x64 // 4803d0 | push edx // 48ffc3 | push eax // 0fb602 | add esp, 4 // 8843ff | push 0 // 408832 | push 0x64 $sequence_16 = { 0f95c0 85c0 74dc e8???????? } // n = 4, score = 200 // 0f95c0 | setne al // 85c0 | test eax, eax // 74dc | je 0xffffffde // e8???????? | $sequence_17 = { 888deffeffff 0fb655fc 0fb645f8 8a8c15f0feffff 888c05f0feffff 0fb655fc 8a85effeffff } // n = 7, score = 200 // 888deffeffff | push 3 // 0fb655fc | push 0x50 // 0fb645f8 | push 0 // 8a8c15f0feffff | push 0 // 888c05f0feffff | push 3 // 0fb655fc | push 0x50 // 8a85effeffff | push 3 $sequence_18 = { 8985e4feffff 81bde4feffff00010000 7d15 8b8de4feffff 8a95e4feffff } // n = 5, score = 200 // 8985e4feffff | add eax, 1 // 81bde4feffff00010000 | mov dword ptr [ebp - 0x120], eax // 7d15 | cmp dword ptr [ebp - 0x120], 0x100 // 8b8de4feffff | jge 0x9a // 8a95e4feffff | mov ecx, dword ptr [ebp - 0x120] $sequence_19 = { 74dc e8???????? 85c0 78e3 } // n = 4, score = 200 // 74dc | je 0xffffffde // e8???????? | // 85c0 | test eax, eax // 78e3 | js 0xffffffe5 $sequence_20 = { 492bfb ffc1 81e1ff000080 7d0a ffc9 } // n = 5, score = 200 // 492bfb | inc ecx // ffc1 | add edx, ecx // 81e1ff000080 | and edx, 0x800000ff // 7d0a | jge 0x15 // ffc9 | dec edx $sequence_21 = { c785dcfeffff00000000 eb0f 8b8ddcfeffff 83c101 898ddcfeffff 8b95dcfeffff 3b5514 } // n = 7, score = 200 // c785dcfeffff00000000 | push 0x64 // eb0f | push edx // 8b8ddcfeffff | push eax // 83c101 | add esp, 4 // 898ddcfeffff | push 0 // 8b95dcfeffff | push 0x64 // 3b5514 | add esp, 4 $sequence_22 = { 41ffca 4181ca00ffffff 41ffc2 0fb6c1 4c8d0424 488d1424 4c03c0 } // n = 7, score = 200 // 41ffca | dec ecx // 4181ca00ffffff | dec eax // 41ffc2 | xor eax, esp // 0fb6c1 | dec eax // 4c8d0424 | mov dword ptr [esp + 0x100], eax // 488d1424 | dec esp // 4c03c0 | mov ebx, dword ptr [esp + 0x140] $sequence_23 = { 0f8dcf000000 8b45f8 83c001 25ff000080 7907 48 0d00ffffff } // n = 7, score = 200 // 0f8dcf000000 | push 0x50 // 8b45f8 | add esp, 4 // 83c001 | push 0 // 25ff000080 | push 0x64 // 7907 | push edx // 48 | add esp, 4 // 0d00ffffff | push 0 $sequence_24 = { 44880a 410fb610 4103d1 81e2ff000080 } // n = 4, score = 200 // 44880a | inc esp // 410fb610 | mov byte ptr [edx], cl // 4103d1 | inc ecx // 81e2ff000080 | movzx edx, byte ptr [eax] $sequence_25 = { 8b4508 0fb61410 03ca 81e1ff000080 } // n = 4, score = 200 // 8b4508 | push 0 // 0fb61410 | push 0 // 03ca | push eax // 81e1ff000080 | push 0x104 $sequence_26 = { 488bdd 85ed 0f8e8e000000 492bfb } // n = 4, score = 200 // 488bdd | push edx // 85ed | push eax // 0f8e8e000000 | add esp, 4 // 492bfb | push 0 $sequence_27 = { 8b4d10 038ddcfeffff 0fbe11 0fb685eefeffff } // n = 4, score = 200 // 8b4d10 | mov eax, dword ptr [ebp + 8] // 038ddcfeffff | movzx edx, byte ptr [eax + edx] // 0fbe11 | add ecx, edx // 0fb685eefeffff | mov byte ptr [ebp - 0x111], cl $sequence_28 = { 7d0a ffca 81ca00ffffff ffc2 0fb6c2 49ffc3 0fb61404 } // n = 7, score = 200 // 7d0a | inc ecx // ffca | add edx, ecx // 81ca00ffffff | and edx, 0x800000ff // ffc2 | jge 0xc // 0fb6c2 | dec edx // 49ffc3 | or edx, 0xffffff00 // 0fb61404 | inc edx $sequence_29 = { 895c2420 e8???????? 48c747180f000000 4885c0 48895f10 488d1517da0000 } // n = 6, score = 100 // 895c2420 | push 0 // e8???????? | // 48c747180f000000 | push edi // 4885c0 | push 0x104 // 48895f10 | push 0x104 // 488d1517da0000 | mov edi, eax $sequence_30 = { 57 33ff 8db7d0a92300 ff36 } // n = 4, score = 100 // 57 | push edi // 33ff | xor edi, edi // 8db7d0a92300 | lea esi, [edi + 0x23a9d0] // ff36 | push dword ptr [esi] $sequence_31 = { c7466888a22300 6a0d e8???????? 59 8365fc00 ff7668 } // n = 6, score = 100 // c7466888a22300 | mov dword ptr [esi + 0x68], 0x23a288 // 6a0d | push 0xd // e8???????? | // 59 | pop ecx // 8365fc00 | and dword ptr [ebp - 4], 0 // ff7668 | push dword ptr [esi + 0x68] $sequence_32 = { 8b15???????? 895704 66a1???????? 66894708 8a0d???????? 884f0a e8???????? } // n = 7, score = 100 // 8b15???????? | // 895704 | mov dword ptr [edi + 4], edx // 66a1???????? | // 66894708 | mov word ptr [edi + 8], ax // 8a0d???????? | // 884f0a | mov byte ptr [edi + 0xa], cl // e8???????? | $sequence_33 = { 52 ff95dcfeffff 8985ecfeffff 6800800000 6804010000 8b85d8feffff 50 } // n = 7, score = 100 // 52 | push edx // ff95dcfeffff | call dword ptr [ebp - 0x124] // 8985ecfeffff | mov dword ptr [ebp - 0x114], eax // 6800800000 | push 0x8000 // 6804010000 | push 0x104 // 8b85d8feffff | mov eax, dword ptr [ebp - 0x128] // 50 | push eax $sequence_34 = { e8???????? 33db 488d54245c 488b88c0000000 488d0571ac0000 48399938010000 4a8b0ce8 } // n = 7, score = 100 // e8???????? | // 33db | push 0 // 488d54245c | push 0 // 488b88c0000000 | push 0 // 488d0571ac0000 | push 0 // 48399938010000 | push 0 // 4a8b0ce8 | push eax $sequence_35 = { 8b4508 33c9 3b04cda8a72300 7413 41 83f92d } // n = 6, score = 100 // 8b4508 | mov eax, dword ptr [ebp + 8] // 33c9 | xor ecx, ecx // 3b04cda8a72300 | cmp eax, dword ptr [ecx*8 + 0x23a7a8] // 7413 | je 0x15 // 41 | inc ecx // 83f92d | cmp ecx, 0x2d $sequence_36 = { 48ffcd 75d4 488d1df7a40000 488b4bf8 4885c9 } // n = 5, score = 100 // 48ffcd | pop ebp // 75d4 | ret // 488d1df7a40000 | push ebp // 488b4bf8 | mov ebp, esp // 4885c9 | xor eax, eax $sequence_37 = { 7326 488bcb 488bc3 488d1582b20000 48c1f805 83e11f } // n = 6, score = 100 // 7326 | push eax // 488bcb | push 0 // 488bc3 | push eax // 488d1582b20000 | push ebx // 48c1f805 | mov esi, eax // 83e11f | push edi $sequence_38 = { 488bd9 488d3d6c86ffff 488bcf e8???????? 85c0 7422 482bdf } // n = 7, score = 100 // 488bd9 | push 0x104 // 488d3d6c86ffff | push 0x104 // 488bcf | mov edi, eax // e8???????? | // 85c0 | push 0 // 7422 | push edi // 482bdf | pop ecx $sequence_39 = { 7456 8b4de0 8d0c8d20b72300 8901 } // n = 4, score = 100 // 7456 | je 0x58 // 8b4de0 | mov ecx, dword ptr [ebp - 0x20] // 8d0c8d20b72300 | lea ecx, [ecx*4 + 0x23b720] // 8901 | mov dword ptr [ecx], eax $sequence_40 = { e8???????? 85c0 0f84bc020000 488d059bac0000 4a8b04e8 41f644040880 0f84a5020000 } // n = 7, score = 100 // e8???????? | // 85c0 | mov dword ptr [esp + 0x20], ebx // 0f84bc020000 | dec eax // 488d059bac0000 | mov dword ptr [edi + 0x18], 0xf // 4a8b04e8 | dec eax // 41f644040880 | test eax, eax // 0f84a5020000 | dec eax $sequence_41 = { 7420 488d15bd580000 488bcb ff15???????? 488bc8 ff15???????? } // n = 6, score = 100 // 7420 | push 0 // 488d15bd580000 | push 0 // 488bcb | push 0 // ff15???????? | // 488bc8 | push 0 // ff15???????? | $sequence_42 = { 000453 2300 285323 0023 d18a0688078a 46 } // n = 6, score = 100 // 000453 | add byte ptr [ebx + edx*2], al // 2300 | and eax, dword ptr [eax] // 285323 | sub byte ptr [ebx + 0x23], dl // 0023 | add byte ptr [ebx], ah // d18a0688078a | ror dword ptr [edx - 0x75f877fa], 1 // 46 | inc esi $sequence_43 = { 48833d????????00 741e 488d0de59b0000 e8???????? 85c0 740e } // n = 6, score = 100 // 48833d????????00 | // 741e | push eax // 488d0de59b0000 | push 0x104 // e8???????? | // 85c0 | push 0x104 // 740e | mov edi, eax $sequence_44 = { 0fb6c0 eb12 8b45e0 8a80b4a62300 08443b1d 0fb64601 } // n = 6, score = 100 // 0fb6c0 | movzx eax, al // eb12 | jmp 0x14 // 8b45e0 | mov eax, dword ptr [ebp - 0x20] // 8a80b4a62300 | mov al, byte ptr [eax + 0x23a6b4] // 08443b1d | or byte ptr [ebx + edi + 0x1d], al // 0fb64601 | movzx eax, byte ptr [esi + 1] condition: 7 of them and filesize < 262144 }
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