Actor(s): OilRig
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rule win_alma_communicator_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-03-28" version = "1" description = "Detects win.alma_communicator." 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.alma_communicator" malpedia_rule_date = "20230328" malpedia_hash = "9d2d75cef573c1c2d861f5197df8f563b05a305d" malpedia_version = "20230407" 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???????? 59 33c0 e9???????? e8???????? cc } // n = 6, score = 100 // e8???????? | // 59 | pop ecx // 33c0 | xor eax, eax // e9???????? | // e8???????? | // cc | int3 $sequence_1 = { eb71 68f4010000 e8???????? 59 8b0e } // n = 5, score = 100 // eb71 | jmp 0x73 // 68f4010000 | push 0x1f4 // e8???????? | // 59 | pop ecx // 8b0e | mov ecx, dword ptr [esi] $sequence_2 = { 7307 83c8ff 0bd0 eb3e } // n = 4, score = 100 // 7307 | jae 9 // 83c8ff | or eax, 0xffffffff // 0bd0 | or edx, eax // eb3e | jmp 0x40 $sequence_3 = { 8d8dd0ebffff e8???????? 59 8b8dd0ebffff 33d2 e8???????? 6a01 } // n = 7, score = 100 // 8d8dd0ebffff | lea ecx, [ebp - 0x1430] // e8???????? | // 59 | pop ecx // 8b8dd0ebffff | mov ecx, dword ptr [ebp - 0x1430] // 33d2 | xor edx, edx // e8???????? | // 6a01 | push 1 $sequence_4 = { 83b8a800000000 7512 8b04bdf08f4100 807c302900 7504 32c0 eb1a } // n = 7, score = 100 // 83b8a800000000 | cmp dword ptr [eax + 0xa8], 0 // 7512 | jne 0x14 // 8b04bdf08f4100 | mov eax, dword ptr [edi*4 + 0x418ff0] // 807c302900 | cmp byte ptr [eax + esi + 0x29], 0 // 7504 | jne 6 // 32c0 | xor al, al // eb1a | jmp 0x1c $sequence_5 = { 0fb7840d6cffffff 8d4902 6689840d6afbffff 6685c0 75e8 8d8d6cfbffff } // n = 6, score = 100 // 0fb7840d6cffffff | movzx eax, word ptr [ebp + ecx - 0x94] // 8d4902 | lea ecx, [ecx + 2] // 6689840d6afbffff | mov word ptr [ebp + ecx - 0x496], ax // 6685c0 | test ax, ax // 75e8 | jne 0xffffffea // 8d8d6cfbffff | lea ecx, [ebp - 0x494] $sequence_6 = { 50 e8???????? 8bbd54f7ffff 59 8bcf } // n = 5, score = 100 // 50 | push eax // e8???????? | // 8bbd54f7ffff | mov edi, dword ptr [ebp - 0x8ac] // 59 | pop ecx // 8bcf | mov ecx, edi $sequence_7 = { 6a01 8bf0 e8???????? 59 83feff 750b 56 } // n = 7, score = 100 // 6a01 | push 1 // 8bf0 | mov esi, eax // e8???????? | // 59 | pop ecx // 83feff | cmp esi, -1 // 750b | jne 0xd // 56 | push esi $sequence_8 = { 33f6 57 8bf9 85db 740e } // n = 5, score = 100 // 33f6 | xor esi, esi // 57 | push edi // 8bf9 | mov edi, ecx // 85db | test ebx, ebx // 740e | je 0x10 $sequence_9 = { 0fb64102 84c0 750a 6a03 5b } // n = 5, score = 100 // 0fb64102 | movzx eax, byte ptr [ecx + 2] // 84c0 | test al, al // 750a | jne 0xc // 6a03 | push 3 // 5b | pop ebx condition: 7 of them and filesize < 245760 }
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