Created from the codebase of Gozi/ISFB.
rule win_rm3_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2024-10-31" version = "1" description = "Detects win.rm3." 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.rm3" malpedia_rule_date = "20241030" malpedia_hash = "26e26953c49c8efafbf72a38076855d578e0a2e4" malpedia_version = "20241030" 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 = { 8b4508 3b460c 7247 8b7938 } // n = 4, score = 2300 // 8b4508 | and edx, eax // 3b460c | mov eax, dword ptr [esi + 0xc] // 7247 | add eax, edx // 8b7938 | cmp dword ptr [ebp + 8], eax $sequence_1 = { 8b413c 8d5418ff eb0a 8b4138 8b5608 8d5410ff 48 } // n = 7, score = 2300 // 8b413c | movzx eax, word ptr [ecx + 0x14] // 8d5418ff | push esi // eb0a | push esi // 8b4138 | push edi // 8b5608 | lea esi, [eax + ecx + 0x18] // 8d5410ff | mov eax, dword ptr [ebp + 8] // 48 | mov edi, dword ptr [ecx + 0x38] $sequence_2 = { 0fb74106 8365f800 53 8945fc 0fb74114 56 } // n = 6, score = 2300 // 0fb74106 | inc ecx // 8365f800 | mov eax, 0x30c // 53 | dec eax // 8945fc | test eax, eax // 0fb74114 | dec esp // 56 | mov esp, eax $sequence_3 = { 85c0 7505 3945fc 759f } // n = 4, score = 2300 // 85c0 | jae 0xf // 7505 | mov eax, dword ptr [ecx + 0x3c] // 3945fc | lea edx, [eax + ebx - 1] // 759f | jmp 0xc $sequence_4 = { 8b7938 8b4608 8b513c 8b5e10 8d4438ff } // n = 5, score = 2300 // 8b7938 | dec esp // 8b4608 | lea eax, [eax - 0x18] // 8b513c | xor ebx, ebx // 8b5e10 | cmp eax, ebx // 8d4438ff | jae 0x15 $sequence_5 = { 56 57 8d740818 8b4508 } // n = 4, score = 2300 // 56 | dec ecx // 57 | mov esi, eax // 8d740818 | dec ebp // 8b4508 | mov ecx, dword ptr [ecx + 0x98] $sequence_6 = { 03c2 394508 7303 8975f8 } // n = 4, score = 2300 // 03c2 | je 0xcb // 394508 | dec eax // 7303 | mov ecx, ebx // 8975f8 | xor edx, edx $sequence_7 = { 897104 8b4808 ff7004 034c240c } // n = 4, score = 2300 // 897104 | mov eax, dword ptr [esi + 8] // 8b4808 | mov edx, dword ptr [ecx + 0x3c] // ff7004 | mov ebx, dword ptr [esi + 0x10] // 034c240c | lea eax, [eax + edi - 1] $sequence_8 = { 894510 56 8bc3 8d8d68ffffff 8bd6 e8???????? 2907 } // n = 7, score = 1800 // 894510 | lea eax, [ebp - 0x88] // 56 | push eax // 8bc3 | mov eax, esi // 8d8d68ffffff | mov ebp, esp // 8bd6 | push ecx // e8???????? | // 2907 | and dword ptr [ebp - 4], 0 $sequence_9 = { 8b4514 e8???????? 8b5508 57 8bc3 8d8d58feffff } // n = 6, score = 1800 // 8b4514 | cmp edi, eax // e8???????? | // 8b5508 | jbe 0x12 // 57 | jne 7 // 8bc3 | cmp dword ptr [ebp - 4], eax // 8d8d58feffff | jne 0xffffffa4 $sequence_10 = { 8b3d???????? 8365fc00 8d45fc 50 6a00 } // n = 5, score = 1800 // 8b3d???????? | // 8365fc00 | pop edi // 8d45fc | pop esi // 50 | mov dword ptr [ebp - 8], esi // 6a00 | mov eax, dword ptr [ebp - 8] $sequence_11 = { 897df8 e8???????? 8b4d0c 57 8bc6 8d9558feffff } // n = 6, score = 1800 // 897df8 | mov eax, ebx // e8???????? | // 8b4d0c | lea ecx, [ebp - 0x1a8] // 57 | and dword ptr [ebp - 4], 0 // 8bc6 | lea eax, [ebp - 4] // 8d9558feffff | push eax $sequence_12 = { 8bec 51 8365fc00 56 8d4508 50 } // n = 6, score = 1800 // 8bec | jae 0xa // 51 | mov dword ptr [ebp - 8], esi // 8365fc00 | mov eax, dword ptr [ebp - 8] // 56 | mov ebx, dword ptr [esi + 0x10] // 8d4508 | lea eax, [eax + edi - 1] // 50 | dec edi $sequence_13 = { e8???????? 2bf3 89750c 0f88b3000000 8d3c1e 8dbcbd58feffff 837dfcff } // n = 7, score = 1800 // e8???????? | // 2bf3 | not edi // 89750c | and eax, edi // 0f88b3000000 | lea edi, [ebx + edx - 1] // 8d3c1e | mov eax, dword ptr [ebp + 0x14] // 8dbcbd58feffff | mov edx, dword ptr [ebp + 8] // 837dfcff | push edi $sequence_14 = { ff750c 8d8d6cfeffff 50 e8???????? 8d8578ffffff 50 8bc6 } // n = 7, score = 1800 // ff750c | add esi, 0x28 // 8d8d6cfeffff | dec dword ptr [ebp - 4] // 50 | test eax, eax // e8???????? | // 8d8578ffffff | mov eax, dword ptr [esi + 0xc] // 50 | add eax, edx // 8bc6 | cmp dword ptr [ebp + 8], eax $sequence_15 = { 8d9568ffffff e8???????? 85c0 7c15 ff4510 } // n = 5, score = 1800 // 8d9568ffffff | push 0 // e8???????? | // 85c0 | push dword ptr [ebp + 0xc] // 7c15 | lea ecx, [ebp - 0x194] // ff4510 | push eax $sequence_16 = { 41bc01000000 eb07 3d002f0000 750c } // n = 4, score = 300 // 41bc01000000 | mov ebx, eax // eb07 | mov edi, edx // 3d002f0000 | inc ecx // 750c | mov esp, 1 $sequence_17 = { 8d480f e8???????? 448b4f20 4c8b4728 } // n = 4, score = 300 // 8d480f | mov edx, edi // e8???????? | // 448b4f20 | mov ecx, 0x51ff3ea6 // 4c8b4728 | dec eax $sequence_18 = { 488bd7 b9a63eff51 e8???????? 4885c0 7423 4c8d442448 33d2 } // n = 7, score = 300 // 488bd7 | add edi, eax // b9a63eff51 | movzx eax, byte ptr [esp + 0x31] // e8???????? | // 4885c0 | inc esp // 7423 | cmp esp, eax // 4c8d442448 | jb 0xffffffdb // 33d2 | dec eax $sequence_19 = { 33d2 41b80c030000 ff15???????? 4885c0 4c8be0 } // n = 5, score = 300 // 33d2 | mov eax, dword ptr [ecx] // 41b80c030000 | inc ecx // ff15???????? | // 4885c0 | add eax, 1 // 4c8be0 | dec eax $sequence_20 = { 4883c604 03f8 0fb6442431 443be0 72cf } // n = 5, score = 300 // 4883c604 | jmp 9 // 03f8 | cmp eax, 0x2f00 // 0fb6442431 | jne 0x15 // 443be0 | dec eax // 72cf | add esi, 4 $sequence_21 = { 448d443616 33d2 ff15???????? 4885c0 488bf0 0f84bd000000 488bcb } // n = 7, score = 300 // 448d443616 | xor edx, edx // 33d2 | lea ecx, [eax + 0xf] // ff15???????? | // 4885c0 | inc esp // 488bf0 | mov ecx, dword ptr [edi + 0x20] // 0f84bd000000 | dec esp // 488bcb | mov eax, dword ptr [edi + 0x28] $sequence_22 = { 8b01 4183c001 4883c104 48014268 } // n = 4, score = 300 // 8b01 | test eax, eax // 4183c001 | je 0x2d // 4883c104 | dec esp // 48014268 | lea eax, [esp + 0x48] $sequence_23 = { 4881ecc0000000 488b0d???????? 418bd8 8bfa } // n = 4, score = 300 // 4881ecc0000000 | dec eax // 488b0d???????? | // 418bd8 | sub esp, 0xc0 // 8bfa | inc ecx $sequence_24 = { 83c404 8b0d???????? 50 8b85d4fbffff 50 6a17 } // n = 6, score = 100 // 83c404 | push dword ptr [eax + 4] // 8b0d???????? | // 50 | add ecx, dword ptr [esp + 0xc] // 8b85d4fbffff | cmp dword ptr [ebp + 8], eax // 50 | jae 5 // 6a17 | mov dword ptr [ebp - 8], esi $sequence_25 = { 8b8500ffffff 8a8c0574ffffff 8a940556ffffff 28ca 88940556ffffff 83c001 } // n = 6, score = 100 // 8b8500ffffff | mov dword ptr [ebp - 0x9c], ecx // 8a8c0574ffffff | lea eax, [ebp - 0x24] // 8a940556ffffff | mov esi, dword ptr [eax] // 28ca | mov edi, dword ptr [eax + 4] // 88940556ffffff | mov ebx, dword ptr [eax + 8] // 83c001 | pop ebp $sequence_26 = { 898d64ffffff e8???????? 8d45dc 8b30 8b7804 8b5808 } // n = 6, score = 100 // 898d64ffffff | jmp 0xc // e8???????? | // 8d45dc | mov eax, dword ptr [ecx + 0x38] // 8b30 | mov edx, dword ptr [esi + 8] // 8b7804 | mov ecx, dword ptr [eax + 0x3c] // 8b5808 | add ecx, eax $sequence_27 = { e8???????? 8b45b4 8b483c 890c24 c744240400000000 8b4db0 } // n = 6, score = 100 // e8???????? | // 8b45b4 | and edi, edx // 8b483c | mov eax, dword ptr [ebp - 0x60] // 890c24 | add eax, ebx // c744240400000000 | mov ebx, dword ptr [ecx + 0x24] // 8b4db0 | mov dword ptr [ebp - 0xa4], eax $sequence_28 = { 8945b8 894db4 8955b0 897dac 8975a8 0f84b5000000 } // n = 6, score = 100 // 8945b8 | sub esp, 0x34 // 894db4 | mov eax, dword ptr [ebp - 0x4c] // 8955b0 | mov ecx, dword ptr [eax + 0x3c] // 897dac | mov dword ptr [esp], ecx // 8975a8 | mov dword ptr [esp + 4], 0 // 0f84b5000000 | mov ecx, dword ptr [ebp - 0x50] $sequence_29 = { 898d6cffffff 899d68ffffff 89bd64ffffff 898560ffffff e9???????? } // n = 5, score = 100 // 898d6cffffff | jne 7 // 899d68ffffff | cmp dword ptr [ebp - 4], eax // 89bd64ffffff | jne 0xffffffa1 // 898560ffffff | mov ebx, dword ptr [esi + 0x10] // e9???????? | $sequence_30 = { 8b45a0 01d8 8b5924 89855cffffff 89d8 } // n = 5, score = 100 // 8b45a0 | mov eax, dword ptr [esi + 0xc] // 01d8 | add eax, edx // 8b5924 | cmp dword ptr [ebp + 8], eax // 89855cffffff | jae 0x11 // 89d8 | dec eax $sequence_31 = { 8b8d6cffffff 894c2404 898558ffffff e8???????? } // n = 4, score = 100 // 8b8d6cffffff | jb 0x4c // 894c2404 | mov edi, dword ptr [ecx + 0x38] // 898558ffffff | test eax, eax // e8???????? | $sequence_32 = { 89462c 890c24 c744240400000000 8955d0 e8???????? } // n = 5, score = 100 // 89462c | push eax // 890c24 | push 0x17 // c744240400000000 | mov dword ptr [ebp - 0x418], eax // 8955d0 | call ecx // e8???????? | $sequence_33 = { 898558ffffff 89d8 c1e81f c1eb1d 83e301 } // n = 5, score = 100 // 898558ffffff | ret // 89d8 | push ebp // c1e81f | mov ebp, esp // c1eb1d | push edi // 83e301 | push esi $sequence_34 = { 8b15???????? 8985e8fdffff 898de4fdffff ffd2 } // n = 4, score = 100 // 8b15???????? | // 8985e8fdffff | add esp, 4 // 898de4fdffff | push eax // ffd2 | mov eax, dword ptr [ebp - 0x42c] $sequence_35 = { eb16 8a8563ffffff a801 755c eb00 31c0 } // n = 6, score = 100 // eb16 | not eax // 8a8563ffffff | and edx, eax // a801 | mov eax, dword ptr [esi + 0xc] // 755c | add eax, edx // eb00 | cmp dword ptr [ebp + 8], eax // 31c0 | lea edx, [eax + ebx - 1] $sequence_36 = { c744240400000000 8955d4 e8???????? 8d0d96318702 } // n = 4, score = 100 // c744240400000000 | push 0 // 8955d4 | push 0x80000000 // e8???????? | // 8d0d96318702 | push 0 $sequence_37 = { 8985e8fbffff ffd1 8b0d???????? 6a00 6800000080 6a00 6a00 } // n = 7, score = 100 // 8985e8fbffff | mov eax, dword ptr [ebp - 8] // ffd1 | add esi, 0x28 // 8b0d???????? | // 6a00 | dec dword ptr [ebp - 4] // 6800000080 | test eax, eax // 6a00 | mov eax, dword ptr [ebp + 8] // 6a00 | cmp eax, dword ptr [esi + 0xc] $sequence_38 = { 8b3e 83c618 81ff50450000 0f44d6 8b7580 81ff50450000 89c7 } // n = 7, score = 100 // 8b3e | mov eax, ebx // 83c618 | jmp 0x18 // 81ff50450000 | mov al, byte ptr [ebp - 0x9d] // 0f44d6 | test al, 1 // 8b7580 | jne 0x60 // 81ff50450000 | jmp 6 // 89c7 | xor eax, eax $sequence_39 = { 8b4870 894de0 8b4874 894de4 8b4868 } // n = 5, score = 100 // 8b4870 | lea eax, [eax + edi - 1] // 894de0 | dec edi // 8b4874 | not edi // 894de4 | and eax, edi // 8b4868 | lea edi, [ebx + edx - 1] condition: 7 of them and filesize < 221184 }
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