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 = "2023-12-06" 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 = "20231130" malpedia_hash = "fc8a0e9f343f6d6ded9e7df1a64dac0cc68d7351" malpedia_version = "20230808" 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 = { c744242400000000 e8???????? 68???????? ff15???????? a3???????? 8d4c2430 6a12 } // n = 7, score = 200 // c744242400000000 | mov dword ptr [esp + 0x24], 0 // e8???????? | // 68???????? | // ff15???????? | // a3???????? | // 8d4c2430 | lea ecx, [esp + 0x30] // 6a12 | push 0x12 $sequence_1 = { 68???????? 8d8c24a4000000 e8???????? 8d8c24a0000000 e8???????? 8d8c24a0000000 } // n = 6, score = 200 // 68???????? | // 8d8c24a4000000 | lea ecx, [esp + 0xa4] // e8???????? | // 8d8c24a0000000 | lea ecx, [esp + 0xa0] // e8???????? | // 8d8c24a0000000 | lea ecx, [esp + 0xa0] $sequence_2 = { 668908 8d8d68eeffff c645fc26 e8???????? 8d8d68eeffff e8???????? 8d8dd0efffff } // n = 7, score = 200 // 668908 | mov word ptr [eax], cx // 8d8d68eeffff | lea ecx, [ebp - 0x1198] // c645fc26 | mov byte ptr [ebp - 4], 0x26 // e8???????? | // 8d8d68eeffff | lea ecx, [ebp - 0x1198] // e8???????? | // 8d8dd0efffff | lea ecx, [ebp - 0x1030] $sequence_3 = { 8945fc 85f6 7407 83feff 746f eb69 8b1c9d485c4100 } // n = 7, score = 200 // 8945fc | mov dword ptr [ebp - 4], eax // 85f6 | test esi, esi // 7407 | je 9 // 83feff | cmp esi, -1 // 746f | je 0x71 // eb69 | jmp 0x6b // 8b1c9d485c4100 | mov ebx, dword ptr [ebx*4 + 0x415c48] $sequence_4 = { 50 e8???????? 8b853ceeffff 83c40c 8985b0efffff 89b5b4efffff c645fc35 } // n = 7, score = 200 // 50 | push eax // e8???????? | // 8b853ceeffff | mov eax, dword ptr [ebp - 0x11c4] // 83c40c | add esp, 0xc // 8985b0efffff | mov dword ptr [ebp - 0x1050], eax // 89b5b4efffff | mov dword ptr [ebp - 0x104c], esi // c645fc35 | mov byte ptr [ebp - 4], 0x35 $sequence_5 = { 8d85f0bfffff 50 ff15???????? 85c0 0f847b020000 6800200000 } // n = 6, score = 200 // 8d85f0bfffff | lea eax, [ebp - 0x4010] // 50 | push eax // ff15???????? | // 85c0 | test eax, eax // 0f847b020000 | je 0x281 // 6800200000 | push 0x2000 $sequence_6 = { 0f8796150000 52 51 e8???????? 83c408 807c241200 } // n = 6, score = 200 // 0f8796150000 | ja 0x159c // 52 | push edx // 51 | push ecx // e8???????? | // 83c408 | add esp, 8 // 807c241200 | cmp byte ptr [esp + 0x12], 0 $sequence_7 = { 8d442468 50 e8???????? 837c244408 8d4c2430 } // n = 5, score = 200 // 8d442468 | lea eax, [esp + 0x68] // 50 | push eax // e8???????? | // 837c244408 | cmp dword ptr [esp + 0x44], 8 // 8d4c2430 | lea ecx, [esp + 0x30] $sequence_8 = { 0f438570efffff 8d8d88efffff 50 e8???????? 6a01 68???????? 8d8d88efffff } // n = 7, score = 200 // 0f438570efffff | cmovae eax, dword ptr [ebp - 0x1090] // 8d8d88efffff | lea ecx, [ebp - 0x1078] // 50 | push eax // e8???????? | // 6a01 | push 1 // 68???????? | // 8d8d88efffff | lea ecx, [ebp - 0x1078] $sequence_9 = { 85f6 0f8551010000 a1???????? b9???????? 83c0f5 50 56 } // n = 7, score = 200 // 85f6 | test esi, esi // 0f8551010000 | jne 0x157 // a1???????? | // b9???????? | // 83c0f5 | add eax, -0xb // 50 | push eax // 56 | push esi condition: 7 of them and filesize < 286720 }
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