Actor(s): Turla
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rule win_outlook_backdoor_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.outlook_backdoor." 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.outlook_backdoor" 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 = { ff30 8d75e0 e8???????? 8b08 894d18 8b4004 83c410 } // n = 7, score = 600 // ff30 | push dword ptr [eax] // 8d75e0 | lea esi, [ebp - 0x20] // e8???????? | // 8b08 | mov ecx, dword ptr [eax] // 894d18 | mov dword ptr [ebp + 0x18], ecx // 8b4004 | mov eax, dword ptr [eax + 4] // 83c410 | add esp, 0x10 $sequence_1 = { e8???????? 83c40c a1???????? 8b4df4 5f 5e 64890d00000000 } // n = 7, score = 600 // e8???????? | // 83c40c | add esp, 0xc // a1???????? | // 8b4df4 | mov ecx, dword ptr [ebp - 0xc] // 5f | pop edi // 5e | pop esi // 64890d00000000 | mov dword ptr fs:[0], ecx $sequence_2 = { ff7004 8d75d8 ff30 e8???????? 8b08 ff75e8 } // n = 6, score = 600 // ff7004 | push dword ptr [eax + 4] // 8d75d8 | lea esi, [ebp - 0x28] // ff30 | push dword ptr [eax] // e8???????? | // 8b08 | mov ecx, dword ptr [eax] // ff75e8 | push dword ptr [ebp - 0x18] $sequence_3 = { 8d4dd4 e9???????? 8d75b8 e9???????? 8d758c } // n = 5, score = 600 // 8d4dd4 | lea ecx, [ebp - 0x2c] // e9???????? | // 8d75b8 | lea esi, [ebp - 0x48] // e9???????? | // 8d758c | lea esi, [ebp - 0x74] $sequence_4 = { 7522 ff750c 8bcf ff7508 e8???????? 56 6a01 } // n = 7, score = 600 // 7522 | jne 0x24 // ff750c | push dword ptr [ebp + 0xc] // 8bcf | mov ecx, edi // ff7508 | push dword ptr [ebp + 8] // e8???????? | // 56 | push esi // 6a01 | push 1 $sequence_5 = { 52 e8???????? 6a0c e8???????? 8bf0 59 59 } // n = 7, score = 600 // 52 | push edx // e8???????? | // 6a0c | push 0xc // e8???????? | // 8bf0 | mov esi, eax // 59 | pop ecx // 59 | pop ecx $sequence_6 = { 51 51 53 56 57 8965f0 6a5c } // n = 7, score = 600 // 51 | push ecx // 51 | push ecx // 53 | push ebx // 56 | push esi // 57 | push edi // 8965f0 | mov dword ptr [ebp - 0x10], esp // 6a5c | push 0x5c $sequence_7 = { 50 33c0 40 894d08 e8???????? 5b 5d } // n = 7, score = 600 // 50 | push eax // 33c0 | xor eax, eax // 40 | inc eax // 894d08 | mov dword ptr [ebp + 8], ecx // e8???????? | // 5b | pop ebx // 5d | pop ebp $sequence_8 = { 8b4d0c 832100 57 8d3c06 8975f8 3bf7 7373 } // n = 7, score = 600 // 8b4d0c | mov ecx, dword ptr [ebp + 0xc] // 832100 | and dword ptr [ecx], 0 // 57 | push edi // 8d3c06 | lea edi, [esi + eax] // 8975f8 | mov dword ptr [ebp - 8], esi // 3bf7 | cmp esi, edi // 7373 | jae 0x75 $sequence_9 = { 8b4518 895de0 897de4 8945ec } // n = 4, score = 600 // 8b4518 | mov eax, dword ptr [ebp + 0x18] // 895de0 | mov dword ptr [ebp - 0x20], ebx // 897de4 | mov dword ptr [ebp - 0x1c], edi // 8945ec | mov dword ptr [ebp - 0x14], eax condition: 7 of them and filesize < 2912256 }
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