Actor(s): Turla Group
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rule win_comlook_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.comlook." 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.comlook" 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 = { e8???????? b012 8b4c2450 64890d00000000 59 5f 5e } // n = 7, score = 100 // e8???????? | // b012 | mov al, 0x12 // 8b4c2450 | mov ecx, dword ptr [esp + 0x50] // 64890d00000000 | mov dword ptr fs:[0], ecx // 59 | pop ecx // 5f | pop edi // 5e | pop esi $sequence_1 = { 8b5144 895594 837d9400 0f84eb000000 8b4594 83780400 742f } // n = 7, score = 100 // 8b5144 | mov edx, dword ptr [ecx + 0x44] // 895594 | mov dword ptr [ebp - 0x6c], edx // 837d9400 | cmp dword ptr [ebp - 0x6c], 0 // 0f84eb000000 | je 0xf1 // 8b4594 | mov eax, dword ptr [ebp - 0x6c] // 83780400 | cmp dword ptr [eax + 4], 0 // 742f | je 0x31 $sequence_2 = { e9???????? 8d45ac 50 e8???????? c3 8d45a4 50 } // n = 7, score = 100 // e9???????? | // 8d45ac | lea eax, [ebp - 0x54] // 50 | push eax // e8???????? | // c3 | ret // 8d45a4 | lea eax, [ebp - 0x5c] // 50 | push eax $sequence_3 = { 8d8d60ffffff 51 8d956cffffff 52 8b45f4 50 ff15???????? } // n = 7, score = 100 // 8d8d60ffffff | lea ecx, [ebp - 0xa0] // 51 | push ecx // 8d956cffffff | lea edx, [ebp - 0x94] // 52 | push edx // 8b45f4 | mov eax, dword ptr [ebp - 0xc] // 50 | push eax // ff15???????? | $sequence_4 = { 8b4d0c 81c1ac000000 8b10 8911 8b5004 895104 8b5008 } // n = 7, score = 100 // 8b4d0c | mov ecx, dword ptr [ebp + 0xc] // 81c1ac000000 | add ecx, 0xac // 8b10 | mov edx, dword ptr [eax] // 8911 | mov dword ptr [ecx], edx // 8b5004 | mov edx, dword ptr [eax + 4] // 895104 | mov dword ptr [ecx + 4], edx // 8b5008 | mov edx, dword ptr [eax + 8] $sequence_5 = { e8???????? 83ec0c c745fc00000000 8bcc 8965f0 50 e8???????? } // n = 7, score = 100 // e8???????? | // 83ec0c | sub esp, 0xc // c745fc00000000 | mov dword ptr [ebp - 4], 0 // 8bcc | mov ecx, esp // 8965f0 | mov dword ptr [ebp - 0x10], esp // 50 | push eax // e8???????? | $sequence_6 = { e8???????? 8bc8 83c40c 894c2414 85c9 0f84b5020000 8b754c } // n = 7, score = 100 // e8???????? | // 8bc8 | mov ecx, eax // 83c40c | add esp, 0xc // 894c2414 | mov dword ptr [esp + 0x14], ecx // 85c9 | test ecx, ecx // 0f84b5020000 | je 0x2bb // 8b754c | mov esi, dword ptr [ebp + 0x4c] $sequence_7 = { eb45 8b55f8 8b827c4c0000 50 8b8a784c0000 51 8b55f8 } // n = 7, score = 100 // eb45 | jmp 0x47 // 8b55f8 | mov edx, dword ptr [ebp - 8] // 8b827c4c0000 | mov eax, dword ptr [edx + 0x4c7c] // 50 | push eax // 8b8a784c0000 | mov ecx, dword ptr [edx + 0x4c78] // 51 | push ecx // 8b55f8 | mov edx, dword ptr [ebp - 8] $sequence_8 = { e9???????? c685f4feffff00 837d0800 7459 8b5508 52 e8???????? } // n = 7, score = 100 // e9???????? | // c685f4feffff00 | mov byte ptr [ebp - 0x10c], 0 // 837d0800 | cmp dword ptr [ebp + 8], 0 // 7459 | je 0x5b // 8b5508 | mov edx, dword ptr [ebp + 8] // 52 | push edx // e8???????? | $sequence_9 = { e9???????? eb0b 33d2 75fc c745f400000000 8b4510 894594 } // n = 7, score = 100 // e9???????? | // eb0b | jmp 0xd // 33d2 | xor edx, edx // 75fc | jne 0xfffffffe // c745f400000000 | mov dword ptr [ebp - 0xc], 0 // 8b4510 | mov eax, dword ptr [ebp + 0x10] // 894594 | mov dword ptr [ebp - 0x6c], eax condition: 7 of them and filesize < 4553728 }
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