Actor(s): OilRig
There is no description at this point.
rule win_alma_communicator_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" 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 = "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 = { 8a4a1c 884807 a1???????? c6400800 e8???????? 59 } // n = 6, score = 100 // 8a4a1c | mov cl, byte ptr [edx + 0x1c] // 884807 | mov byte ptr [eax + 7], cl // a1???????? | // c6400800 | mov byte ptr [eax + 8], 0 // e8???????? | // 59 | pop ecx $sequence_1 = { 8945f0 8b450c 8945f4 8b4514 40 c745ec93f84000 894df8 } // n = 7, score = 100 // 8945f0 | mov dword ptr [ebp - 0x10], eax // 8b450c | mov eax, dword ptr [ebp + 0xc] // 8945f4 | mov dword ptr [ebp - 0xc], eax // 8b4514 | mov eax, dword ptr [ebp + 0x14] // 40 | inc eax // c745ec93f84000 | mov dword ptr [ebp - 0x14], 0x40f893 // 894df8 | mov dword ptr [ebp - 8], ecx $sequence_2 = { 8bcb 898554f7ffff e8???????? 8bcb 898550f7ffff 6a02 5f } // n = 7, score = 100 // 8bcb | mov ecx, ebx // 898554f7ffff | mov dword ptr [ebp - 0x8ac], eax // e8???????? | // 8bcb | mov ecx, ebx // 898550f7ffff | mov dword ptr [ebp - 0x8b0], eax // 6a02 | push 2 // 5f | pop edi $sequence_3 = { e8???????? 83c40c 8d8d58ffffff 8d5102 } // n = 4, score = 100 // e8???????? | // 83c40c | add esp, 0xc // 8d8d58ffffff | lea ecx, [ebp - 0xa8] // 8d5102 | lea edx, [ecx + 2] $sequence_4 = { 8974241c 68d0070000 832600 897c2424 } // n = 4, score = 100 // 8974241c | mov dword ptr [esp + 0x1c], esi // 68d0070000 | push 0x7d0 // 832600 | and dword ptr [esi], 0 // 897c2424 | mov dword ptr [esp + 0x24], edi $sequence_5 = { 668b4f02 03fe 663bca 75f5 ffb53cf7ffff 8907 6bc328 } // n = 7, score = 100 // 668b4f02 | mov cx, word ptr [edi + 2] // 03fe | add edi, esi // 663bca | cmp cx, dx // 75f5 | jne 0xfffffff7 // ffb53cf7ffff | push dword ptr [ebp - 0x8c4] // 8907 | mov dword ptr [edi], eax // 6bc328 | imul eax, ebx, 0x28 $sequence_6 = { 0f85aa010000 33c0 40 8985ccebffff } // n = 4, score = 100 // 0f85aa010000 | jne 0x1b0 // 33c0 | xor eax, eax // 40 | inc eax // 8985ccebffff | mov dword ptr [ebp - 0x1434], eax $sequence_7 = { 7204 3c7a 7608 3c2b 7404 3c2f } // n = 6, score = 100 // 7204 | jb 6 // 3c7a | cmp al, 0x7a // 7608 | jbe 0xa // 3c2b | cmp al, 0x2b // 7404 | je 6 // 3c2f | cmp al, 0x2f $sequence_8 = { 88840d20f6ffff 41 84c0 75ed 8d8d20f6ffff 49 8a4101 } // n = 7, score = 100 // 88840d20f6ffff | mov byte ptr [ebp + ecx - 0x9e0], al // 41 | inc ecx // 84c0 | test al, al // 75ed | jne 0xffffffef // 8d8d20f6ffff | lea ecx, [ebp - 0x9e0] // 49 | dec ecx // 8a4101 | mov al, byte ptr [ecx + 1] $sequence_9 = { 8a01 41 84c0 75f9 8a442454 2bca 83f901 } // n = 7, score = 100 // 8a01 | mov al, byte ptr [ecx] // 41 | inc ecx // 84c0 | test al, al // 75f9 | jne 0xfffffffb // 8a442454 | mov al, byte ptr [esp + 0x54] // 2bca | sub ecx, edx // 83f901 | cmp ecx, 1 condition: 7 of them and filesize < 245760 }
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