Actor(s): Stone Panda
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rule win_chches_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.chches." 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.chches" 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 = { 6a08 ffd1 8b574c 50 ffd2 8b4d08 8b5618 } // n = 7, score = 200 // 6a08 | push 8 // ffd1 | call ecx // 8b574c | mov edx, dword ptr [edi + 0x4c] // 50 | push eax // ffd2 | call edx // 8b4d08 | mov ecx, dword ptr [ebp + 8] // 8b5618 | mov edx, dword ptr [esi + 0x18] $sequence_1 = { c745e82c000000 c7853cffffff22006e00 c78540ffffff65007400 c78544ffffff77006f00 c78548ffffff72006b00 c7854cffffff2e007000 c78550ffffff72006f00 } // n = 7, score = 200 // c745e82c000000 | mov dword ptr [ebp - 0x18], 0x2c // c7853cffffff22006e00 | mov dword ptr [ebp - 0xc4], 0x6e0022 // c78540ffffff65007400 | mov dword ptr [ebp - 0xc0], 0x740065 // c78544ffffff77006f00 | mov dword ptr [ebp - 0xbc], 0x6f0077 // c78548ffffff72006b00 | mov dword ptr [ebp - 0xb8], 0x6b0072 // c7854cffffff2e007000 | mov dword ptr [ebp - 0xb4], 0x70002e // c78550ffffff72006f00 | mov dword ptr [ebp - 0xb0], 0x6f0072 $sequence_2 = { 8b5644 83c135 51 50 6a08 ffd2 50 } // n = 7, score = 200 // 8b5644 | mov edx, dword ptr [esi + 0x44] // 83c135 | add ecx, 0x35 // 51 | push ecx // 50 | push eax // 6a08 | push 8 // ffd2 | call edx // 50 | push eax $sequence_3 = { 8bcf 894304 e8???????? 83c404 6a00 6a00 53 } // n = 7, score = 200 // 8bcf | mov ecx, edi // 894304 | mov dword ptr [ebx + 4], eax // e8???????? | // 83c404 | add esp, 4 // 6a00 | push 0 // 6a00 | push 0 // 53 | push ebx $sequence_4 = { 52 8945fc 50 8b4768 ffd0 85f6 0f846e020000 } // n = 7, score = 200 // 52 | push edx // 8945fc | mov dword ptr [ebp - 4], eax // 50 | push eax // 8b4768 | mov eax, dword ptr [edi + 0x68] // ffd0 | call eax // 85f6 | test esi, esi // 0f846e020000 | je 0x274 $sequence_5 = { e8???????? 8b4b08 89410c 8b5308 83c404 837a0c00 740d } // n = 7, score = 200 // e8???????? | // 8b4b08 | mov ecx, dword ptr [ebx + 8] // 89410c | mov dword ptr [ecx + 0xc], eax // 8b5308 | mov edx, dword ptr [ebx + 8] // 83c404 | add esp, 4 // 837a0c00 | cmp dword ptr [edx + 0xc], 0 // 740d | je 0xf $sequence_6 = { 52 50 6801000040 57 8901 8b86a4000000 53 } // n = 7, score = 200 // 52 | push edx // 50 | push eax // 6801000040 | push 0x40000001 // 57 | push edi // 8901 | mov dword ptr [ecx], eax // 8b86a4000000 | mov eax, dword ptr [esi + 0xa4] // 53 | push ebx $sequence_7 = { 83c31c 3bdf 7415 8b03 3bc7 740f 8b4e44 } // n = 7, score = 200 // 83c31c | add ebx, 0x1c // 3bdf | cmp ebx, edi // 7415 | je 0x17 // 8b03 | mov eax, dword ptr [ebx] // 3bc7 | cmp eax, edi // 740f | je 0x11 // 8b4e44 | mov ecx, dword ptr [esi + 0x44] $sequence_8 = { 85c0 751e 68c8000000 c787c800000032000000 8b4644 6a08 ffd0 } // n = 7, score = 200 // 85c0 | test eax, eax // 751e | jne 0x20 // 68c8000000 | push 0xc8 // c787c800000032000000 | mov dword ptr [edi + 0xc8], 0x32 // 8b4644 | mov eax, dword ptr [esi + 0x44] // 6a08 | push 8 // ffd0 | call eax $sequence_9 = { 8b464c ffd0 8b0f 8b54240c 894114 8b4204 } // n = 6, score = 200 // 8b464c | mov eax, dword ptr [esi + 0x4c] // ffd0 | call eax // 8b0f | mov ecx, dword ptr [edi] // 8b54240c | mov edx, dword ptr [esp + 0xc] // 894114 | mov dword ptr [ecx + 0x14], eax // 8b4204 | mov eax, dword ptr [edx + 4] condition: 7 of them and filesize < 122880 }
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