Actor(s): TA505
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rule win_andromut_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.andromut." 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.andromut" 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 = { 53 56 56 53 56 6800000040 8d8da8f9ffff } // n = 7, score = 200 // 53 | push ebx // 56 | push esi // 56 | push esi // 53 | push ebx // 56 | push esi // 6800000040 | push 0x40000000 // 8d8da8f9ffff | lea ecx, [ebp - 0x658] $sequence_1 = { 8365ec00 8365fc00 33c0 8b7508 33db } // n = 5, score = 200 // 8365ec00 | and dword ptr [ebp - 0x14], 0 // 8365fc00 | and dword ptr [ebp - 4], 0 // 33c0 | xor eax, eax // 8b7508 | mov esi, dword ptr [ebp + 8] // 33db | xor ebx, ebx $sequence_2 = { 6a01 e8???????? c3 6a50 b8???????? e8???????? 8bf2 } // n = 7, score = 200 // 6a01 | push 1 // e8???????? | // c3 | ret // 6a50 | push 0x50 // b8???????? | // e8???????? | // 8bf2 | mov esi, edx $sequence_3 = { 3bf7 7ce4 5f 5e 8be5 5d c3 } // n = 7, score = 200 // 3bf7 | cmp esi, edi // 7ce4 | jl 0xffffffe6 // 5f | pop edi // 5e | pop esi // 8be5 | mov esp, ebp // 5d | pop ebp // c3 | ret $sequence_4 = { 83c102 663bc3 75f5 2bca 8b958cf9ffff d1f9 8d0409 } // n = 7, score = 200 // 83c102 | add ecx, 2 // 663bc3 | cmp ax, bx // 75f5 | jne 0xfffffff7 // 2bca | sub ecx, edx // 8b958cf9ffff | mov edx, dword ptr [ebp - 0x674] // d1f9 | sar ecx, 1 // 8d0409 | lea eax, [ecx + ecx] $sequence_5 = { 50 8d85b8ebffff 50 8d8d40e3ffff e8???????? 83bd54e3ffff10 8db540e3ffff } // n = 7, score = 200 // 50 | push eax // 8d85b8ebffff | lea eax, [ebp - 0x1448] // 50 | push eax // 8d8d40e3ffff | lea ecx, [ebp - 0x1cc0] // e8???????? | // 83bd54e3ffff10 | cmp dword ptr [ebp - 0x1cac], 0x10 // 8db540e3ffff | lea esi, [ebp - 0x1cc0] $sequence_6 = { e8???????? 8b15???????? 8d8574ffffff 8b0d???????? 83c40c } // n = 5, score = 200 // e8???????? | // 8b15???????? | // 8d8574ffffff | lea eax, [ebp - 0x8c] // 8b0d???????? | // 83c40c | add esp, 0xc $sequence_7 = { 8d4c243c e8???????? c70424d0070000 ffd6 e8???????? 53 57 } // n = 7, score = 200 // 8d4c243c | lea ecx, [esp + 0x3c] // e8???????? | // c70424d0070000 | mov dword ptr [esp], 0x7d0 // ffd6 | call esi // e8???????? | // 53 | push ebx // 57 | push edi $sequence_8 = { 85c0 0f8459040000 8d8dc8feffff 8d5102 } // n = 4, score = 200 // 85c0 | test eax, eax // 0f8459040000 | je 0x45f // 8d8dc8feffff | lea ecx, [ebp - 0x138] // 8d5102 | lea edx, [ecx + 2] $sequence_9 = { 8d8d00f8ffff 51 ffd0 b974723dc5 e8???????? } // n = 5, score = 200 // 8d8d00f8ffff | lea ecx, [ebp - 0x800] // 51 | push ecx // ffd0 | call eax // b974723dc5 | mov ecx, 0xc53d7274 // e8???????? | condition: 7 of them and filesize < 368640 }
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