According to Check Point, this is a Telegram-focused infostealer (SOAP / Delphi) used to target Iranian expats and dissidents.
rule win_telb_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" version = "1" description = "Detects win.telb." 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.telb" malpedia_rule_date = "20230705" malpedia_hash = "42d0574f4405bd7d2b154d321d345acb18834a41" malpedia_version = "20230715" 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 = { b9???????? e8???????? 8b7c241c 8b742414 47 897c241c } // n = 6, score = 200 // b9???????? | // e8???????? | // 8b7c241c | mov edi, dword ptr [esp + 0x1c] // 8b742414 | mov esi, dword ptr [esp + 0x14] // 47 | inc edi // 897c241c | mov dword ptr [esp + 0x1c], edi $sequence_1 = { e8???????? 8b442414 c744244000000000 c744244407000000 } // n = 4, score = 200 // e8???????? | // 8b442414 | mov eax, dword ptr [esp + 0x14] // c744244000000000 | mov dword ptr [esp + 0x40], 0 // c744244407000000 | mov dword ptr [esp + 0x44], 7 $sequence_2 = { 8984247c140000 803d????????00 0f84fe000000 833d????????00 0f85f1000000 6a09 33c0 } // n = 7, score = 200 // 8984247c140000 | mov dword ptr [esp + 0x147c], eax // 803d????????00 | // 0f84fe000000 | je 0x104 // 833d????????00 | // 0f85f1000000 | jne 0xf7 // 6a09 | push 9 // 33c0 | xor eax, eax $sequence_3 = { 6a14 68???????? 8d8dc8eeffff e8???????? } // n = 4, score = 200 // 6a14 | push 0x14 // 68???????? | // 8d8dc8eeffff | lea ecx, [ebp - 0x1138] // e8???????? | $sequence_4 = { eb3f 6a1f 33c0 c744244400000000 68???????? 8d4c2438 } // n = 6, score = 200 // eb3f | jmp 0x41 // 6a1f | push 0x1f // 33c0 | xor eax, eax // c744244400000000 | mov dword ptr [esp + 0x44], 0 // 68???????? | // 8d4c2438 | lea ecx, [esp + 0x38] $sequence_5 = { 0f859a000000 eb3f 6a1f 33c0 c744244400000000 68???????? 8d4c2438 } // n = 7, score = 200 // 0f859a000000 | jne 0xa0 // eb3f | jmp 0x41 // 6a1f | push 0x1f // 33c0 | xor eax, eax // c744244400000000 | mov dword ptr [esp + 0x44], 0 // 68???????? | // 8d4c2438 | lea ecx, [esp + 0x38] $sequence_6 = { 668985a8dfffff 8d8598dfffff 50 c7859cdfffff03000000 c785a4dfffff64a14100 } // n = 5, score = 200 // 668985a8dfffff | mov word ptr [ebp - 0x2058], ax // 8d8598dfffff | lea eax, [ebp - 0x2068] // 50 | push eax // c7859cdfffff03000000 | mov dword ptr [ebp - 0x2064], 3 // c785a4dfffff64a14100 | mov dword ptr [ebp - 0x205c], 0x41a164 $sequence_7 = { e8???????? 8b95e0efffff 8d85c8eeffff 81cf01080000 8d8dd0efffff } // n = 5, score = 200 // e8???????? | // 8b95e0efffff | mov edx, dword ptr [ebp - 0x1020] // 8d85c8eeffff | lea eax, [ebp - 0x1138] // 81cf01080000 | or edi, 0x801 // 8d8dd0efffff | lea ecx, [ebp - 0x1030] $sequence_8 = { 898534eeffff eb06 8bb548eeffff c645fc10 8d8d58efffff 81cf00010000 c78568efffff00000000 } // n = 7, score = 200 // 898534eeffff | mov dword ptr [ebp - 0x11cc], eax // eb06 | jmp 8 // 8bb548eeffff | mov esi, dword ptr [ebp - 0x11b8] // c645fc10 | mov byte ptr [ebp - 4], 0x10 // 8d8d58efffff | lea ecx, [ebp - 0x10a8] // 81cf00010000 | or edi, 0x100 // c78568efffff00000000 | mov dword ptr [ebp - 0x1098], 0 $sequence_9 = { ffd7 83c408 8d4c2420 e8???????? 8bd8 85db 7405 } // n = 7, score = 200 // ffd7 | call edi // 83c408 | add esp, 8 // 8d4c2420 | lea ecx, [esp + 0x20] // e8???????? | // 8bd8 | mov ebx, eax // 85db | test ebx, ebx // 7405 | je 7 condition: 7 of them and filesize < 286720 }
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