Actor(s): Samurai Panda
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rule win_sykipot_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.sykipot." 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.sykipot" malpedia_rule_date = "20230124" malpedia_hash = "2ee0eebba83dce3d019a90519f2f972c0fcf9686" malpedia_version = "20230125" 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 = { b9000a0000 33c0 53 55 56 } // n = 5, score = 200 // b9000a0000 | mov ecx, 0xa00 // 33c0 | xor eax, eax // 53 | push ebx // 55 | push ebp // 56 | push esi $sequence_1 = { 8b1d???????? f3ab 66ab 68???????? 68???????? aa } // n = 6, score = 200 // 8b1d???????? | // f3ab | rep stosd dword ptr es:[edi], eax // 66ab | stosw word ptr es:[edi], ax // 68???????? | // 68???????? | // aa | stosb byte ptr es:[edi], al $sequence_2 = { 5b 81c40c020000 c3 56 8b35???????? ffd6 } // n = 6, score = 200 // 5b | pop ebx // 81c40c020000 | add esp, 0x20c // c3 | ret // 56 | push esi // 8b35???????? | // ffd6 | call esi $sequence_3 = { 8d44244c 52 50 6a1f 56 c744246004000000 ffd7 } // n = 7, score = 200 // 8d44244c | lea eax, [esp + 0x4c] // 52 | push edx // 50 | push eax // 6a1f | push 0x1f // 56 | push esi // c744246004000000 | mov dword ptr [esp + 0x60], 4 // ffd7 | call edi $sequence_4 = { 50 6a00 ff15???????? bf???????? 83c9ff 33c0 } // n = 6, score = 200 // 50 | push eax // 6a00 | push 0 // ff15???????? | // bf???????? | // 83c9ff | or ecx, 0xffffffff // 33c0 | xor eax, eax $sequence_5 = { 8bcc 8911 8b94244c060000 894104 895108 8bcd } // n = 6, score = 200 // 8bcc | mov ecx, esp // 8911 | mov dword ptr [ecx], edx // 8b94244c060000 | mov edx, dword ptr [esp + 0x64c] // 894104 | mov dword ptr [ecx + 4], eax // 895108 | mov dword ptr [ecx + 8], edx // 8bcd | mov ecx, ebp $sequence_6 = { 8d442440 8d8c2458020000 50 55 68???????? 51 ffd3 } // n = 7, score = 200 // 8d442440 | lea eax, [esp + 0x40] // 8d8c2458020000 | lea ecx, [esp + 0x258] // 50 | push eax // 55 | push ebp // 68???????? | // 51 | push ecx // ffd3 | call ebx $sequence_7 = { a4 b939000000 33c0 8dbc24a9010000 8d942488000000 f3ab 66ab } // n = 7, score = 200 // a4 | movsb byte ptr es:[edi], byte ptr [esi] // b939000000 | mov ecx, 0x39 // 33c0 | xor eax, eax // 8dbc24a9010000 | lea edi, [esp + 0x1a9] // 8d942488000000 | lea edx, [esp + 0x88] // f3ab | rep stosd dword ptr es:[edi], eax // 66ab | stosw word ptr es:[edi], ax $sequence_8 = { c20c00 8b450c 48 7515 6a00 6a00 6a00 } // n = 7, score = 200 // c20c00 | ret 0xc // 8b450c | mov eax, dword ptr [ebp + 0xc] // 48 | dec eax // 7515 | jne 0x17 // 6a00 | push 0 // 6a00 | push 0 // 6a00 | push 0 $sequence_9 = { 49 79e3 47 03f5 3bfd } // n = 5, score = 200 // 49 | dec ecx // 79e3 | jns 0xffffffe5 // 47 | inc edi // 03f5 | add esi, ebp // 3bfd | cmp edi, ebp condition: 7 of them and filesize < 286720 }
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