Actor(s): OilRig
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rule win_alma_communicator_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" 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 = "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 = { 803933 755a 80790133 7554 0fb64102 84c0 } // n = 6, score = 100 // 803933 | cmp byte ptr [ecx], 0x33 // 755a | jne 0x5c // 80790133 | cmp byte ptr [ecx + 1], 0x33 // 7554 | jne 0x56 // 0fb64102 | movzx eax, byte ptr [ecx + 2] // 84c0 | test al, al $sequence_1 = { 8bcf 8b06 8b1483 8a01 41 8802 } // n = 6, score = 100 // 8bcf | mov ecx, edi // 8b06 | mov eax, dword ptr [esi] // 8b1483 | mov edx, dword ptr [ebx + eax*4] // 8a01 | mov al, byte ptr [ecx] // 41 | inc ecx // 8802 | mov byte ptr [edx], al $sequence_2 = { ff742414 e8???????? 59 59 e9???????? 68e8030000 } // n = 6, score = 100 // ff742414 | push dword ptr [esp + 0x14] // e8???????? | // 59 | pop ecx // 59 | pop ecx // e9???????? | // 68e8030000 | push 0x3e8 $sequence_3 = { 8d85fcfdffff 50 ff15???????? 83f8ff 7404 a810 } // n = 6, score = 100 // 8d85fcfdffff | lea eax, [ebp - 0x204] // 50 | push eax // ff15???????? | // 83f8ff | cmp eax, -1 // 7404 | je 6 // a810 | test al, 0x10 $sequence_4 = { 2bf9 8d4b01 8a03 43 84c0 75f9 8b55ec } // n = 7, score = 100 // 2bf9 | sub edi, ecx // 8d4b01 | lea ecx, [ebx + 1] // 8a03 | mov al, byte ptr [ebx] // 43 | inc ebx // 84c0 | test al, al // 75f9 | jne 0xfffffffb // 8b55ec | mov edx, dword ptr [ebp - 0x14] $sequence_5 = { 47 84c0 75f8 be???????? 8d85fcfbffff 68ff010000 50 } // n = 7, score = 100 // 47 | inc edi // 84c0 | test al, al // 75f8 | jne 0xfffffffa // be???????? | // 8d85fcfbffff | lea eax, [ebp - 0x404] // 68ff010000 | push 0x1ff // 50 | push eax $sequence_6 = { 68???????? 6a00 ff15???????? e8???????? 8b4dfc } // n = 5, score = 100 // 68???????? | // 6a00 | push 0 // ff15???????? | // e8???????? | // 8b4dfc | mov ecx, dword ptr [ebp - 4] $sequence_7 = { 83c40c 03df 8b7df0 8b45ec c6041f00 8918 } // n = 6, score = 100 // 83c40c | add esp, 0xc // 03df | add ebx, edi // 8b7df0 | mov edi, dword ptr [ebp - 0x10] // 8b45ec | mov eax, dword ptr [ebp - 0x14] // c6041f00 | mov byte ptr [edi + ebx], 0 // 8918 | mov dword ptr [eax], ebx $sequence_8 = { ba???????? 8d8d08faffff e8???????? 3df4010000 0f83d0010000 c6840508faffff00 33c9 } // n = 7, score = 100 // ba???????? | // 8d8d08faffff | lea ecx, [ebp - 0x5f8] // e8???????? | // 3df4010000 | cmp eax, 0x1f4 // 0f83d0010000 | jae 0x1d6 // c6840508faffff00 | mov byte ptr [ebp + eax - 0x5f8], 0 // 33c9 | xor ecx, ecx $sequence_9 = { a1???????? 8b15???????? 8bf2 8907 } // n = 4, score = 100 // a1???????? | // 8b15???????? | // 8bf2 | mov esi, edx // 8907 | mov dword ptr [edi], eax condition: 7 of them and filesize < 245760 }
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