Actor(s): Turla Group
There is no description at this point.
rule win_agent_btz_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2021-06-10" version = "1" description = "Detects win.agent_btz." 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.agent_btz" malpedia_rule_date = "20210604" malpedia_hash = "be09d5d71e77373c0f538068be31a2ad4c69cfbd" malpedia_version = "20210616" 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 = { c74608ffffffff f644240801 7409 56 } // n = 4, score = 2500 // c74608ffffffff | mov dword ptr [esi + 8], 0xffffffff // f644240801 | test byte ptr [esp + 8], 1 // 7409 | je 0xb // 56 | push esi $sequence_1 = { 51 ffd6 8d54240c 52 ffd7 } // n = 5, score = 2500 // 51 | push ecx // ffd6 | call esi // 8d54240c | lea edx, dword ptr [esp + 0xc] // 52 | push edx // ffd7 | call edi $sequence_2 = { 50 ffd3 85c0 75d8 5f 5e 5b } // n = 7, score = 2500 // 50 | push eax // ffd3 | call ebx // 85c0 | test eax, eax // 75d8 | jne 0xffffffda // 5f | pop edi // 5e | pop esi // 5b | pop ebx $sequence_3 = { 895e08 895e04 c7461000000000 895e14 } // n = 4, score = 2400 // 895e08 | mov dword ptr [esi + 8], ebx // 895e04 | mov dword ptr [esi + 4], ebx // c7461000000000 | mov dword ptr [esi + 0x10], 0 // 895e14 | mov dword ptr [esi + 0x14], ebx $sequence_4 = { ff15???????? b804000f00 8b4df4 64890d00000000 5f 5e } // n = 6, score = 2400 // ff15???????? | // b804000f00 | mov eax, 0xf0004 // 8b4df4 | mov ecx, dword ptr [ebp - 0xc] // 64890d00000000 | mov dword ptr fs:[0], ecx // 5f | pop edi // 5e | pop esi $sequence_5 = { c706???????? c7460c00000000 895e08 895e04 } // n = 4, score = 2400 // c706???????? | // c7460c00000000 | mov dword ptr [esi + 0xc], 0 // 895e08 | mov dword ptr [esi + 8], ebx // 895e04 | mov dword ptr [esi + 4], ebx $sequence_6 = { 56 6a00 68???????? 8935???????? e8???????? } // n = 5, score = 2300 // 56 | push esi // 6a00 | push 0 // 68???????? | // 8935???????? | // e8???????? | $sequence_7 = { 50 ff15???????? 894614 33c0 33db } // n = 5, score = 2300 // 50 | push eax // ff15???????? | // 894614 | mov dword ptr [esi + 0x14], eax // 33c0 | xor eax, eax // 33db | xor ebx, ebx $sequence_8 = { 8d542408 52 c744240c30000000 c744241003000000 } // n = 4, score = 2200 // 8d542408 | mov dword ptr [esi + 8], 0xffffffff // 52 | test byte ptr [esp + 8], 1 // c744240c30000000 | je 0x10 // c744241003000000 | push esi $sequence_9 = { 56 8bf1 8b4608 c706???????? 85c0 7413 } // n = 6, score = 2200 // 56 | push esi // 8bf1 | mov esi, ecx // 8b4608 | mov eax, dword ptr [esi + 8] // c706???????? | // 85c0 | test eax, eax // 7413 | je 0x15 $sequence_10 = { c706???????? 85c0 7413 83f8ff 740e 50 ff15???????? } // n = 7, score = 2200 // c706???????? | // 85c0 | push esi // 7413 | add esp, 4 // 83f8ff | lea ecx, dword ptr [esp + 0xc] // 740e | push ecx // 50 | call esi // ff15???????? | $sequence_11 = { 50 ff15???????? c74608ffffffff f644240801 } // n = 4, score = 2200 // 50 | call esi // ff15???????? | // c74608ffffffff | lea edx, dword ptr [esp + 0xc] // f644240801 | push edx $sequence_12 = { 6a0a 68???????? 6a01 6a00 } // n = 4, score = 1400 // 6a0a | push 0xa // 68???????? | // 6a01 | push 1 // 6a00 | push 0 $sequence_13 = { 51 6a00 6819000200 6a00 68???????? } // n = 5, score = 1400 // 51 | push ecx // 6a00 | push 0 // 6819000200 | push 0x20019 // 6a00 | push 0 // 68???????? | $sequence_14 = { 50 68???????? 6a01 68???????? e8???????? 83c410 } // n = 6, score = 1200 // 50 | test eax, eax // 68???????? | // 6a01 | je 0x15 // 68???????? | // e8???????? | // 83c410 | cmp eax, -1 $sequence_15 = { 6a01 6a04 6a01 68???????? } // n = 4, score = 1100 // 6a01 | push 1 // 6a04 | push 4 // 6a01 | push 1 // 68???????? | $sequence_16 = { 83c020 50 e8???????? 83c404 33c0 } // n = 5, score = 1000 // 83c020 | add eax, 0x20 // 50 | push eax // e8???????? | // 83c404 | add esp, 4 // 33c0 | xor eax, eax $sequence_17 = { 89461c 3dea000000 740b 3de5030000 } // n = 4, score = 1000 // 89461c | dec eax // 3dea000000 | mov ecx, dword ptr [edi] // 740b | dec eax // 3de5030000 | mov dword ptr [ecx + 8], eax $sequence_18 = { 50 e8???????? 83c408 6800010000 e8???????? } // n = 5, score = 1000 // 50 | mov dword ptr [esi + 0x28], eax // e8???????? | // 83c408 | dec eax // 6800010000 | mov eax, dword ptr [esi + 0x38] // e8???????? | $sequence_19 = { 6a01 68???????? e8???????? 83c414 5f 5e } // n = 6, score = 1000 // 6a01 | dec eax // 68???????? | // e8???????? | // 83c414 | mov dword ptr [esi + 0x28], eax // 5f | dec eax // 5e | mov eax, dword ptr [esi + 0x38] $sequence_20 = { 7511 e8???????? 83c020 50 } // n = 4, score = 1000 // 7511 | jne 0x13 // e8???????? | // 83c020 | add eax, 0x20 // 50 | push eax $sequence_21 = { 0fb605???????? 66890d???????? 0fb60d???????? 660fafca 6603c8 } // n = 5, score = 1000 // 0fb605???????? | // 66890d???????? | // 0fb60d???????? | // 660fafca | imul cx, dx // 6603c8 | add cx, ax $sequence_22 = { 6a01 e8???????? 50 e8???????? 83c414 } // n = 5, score = 1000 // 6a01 | push 1 // e8???????? | // 50 | push eax // e8???????? | // 83c414 | add esp, 0x14 $sequence_23 = { 56 8bd8 8d4304 8bf1 } // n = 4, score = 900 // 56 | push esi // 8bd8 | mov ebx, eax // 8d4304 | lea eax, dword ptr [ebx + 4] // 8bf1 | mov esi, ecx $sequence_24 = { 56 8bf0 8b4624 57 } // n = 4, score = 900 // 56 | push esi // 8bf0 | mov esi, eax // 8b4624 | mov eax, dword ptr [esi + 0x24] // 57 | push edi $sequence_25 = { 668945f2 58 6a38 668945f4 58 6a78 } // n = 6, score = 900 // 668945f2 | mov word ptr [ebp - 0xe], ax // 58 | pop eax // 6a38 | push 0x38 // 668945f4 | mov word ptr [ebp - 0xc], ax // 58 | pop eax // 6a78 | push 0x78 $sequence_26 = { 6800004004 53 53 8d4dd8 51 } // n = 5, score = 900 // 6800004004 | push 0x4400000 // 53 | push ebx // 53 | push ebx // 8d4dd8 | lea ecx, dword ptr [ebp - 0x28] // 51 | push ecx $sequence_27 = { 66894dec 59 6a25 58 6a30 668945f2 58 } // n = 7, score = 900 // 66894dec | mov word ptr [ebp - 0x14], cx // 59 | pop ecx // 6a25 | push 0x25 // 58 | pop eax // 6a30 | push 0x30 // 668945f2 | mov word ptr [ebp - 0xe], ax // 58 | pop eax $sequence_28 = { 51 ff750c 8d4de4 51 ff7604 } // n = 5, score = 900 // 51 | push ecx // ff750c | push dword ptr [ebp + 0xc] // 8d4de4 | lea ecx, dword ptr [ebp - 0x1c] // 51 | push ecx // ff7604 | push dword ptr [esi + 4] $sequence_29 = { 668945f4 58 6a78 668945f6 58 668945f8 } // n = 6, score = 900 // 668945f4 | mov word ptr [ebp - 0xc], ax // 58 | pop eax // 6a78 | push 0x78 // 668945f6 | mov word ptr [ebp - 0xa], ax // 58 | pop eax // 668945f8 | mov word ptr [ebp - 8], ax $sequence_30 = { 6a27 6a02 6a00 6a01 } // n = 4, score = 800 // 6a27 | push 0x27 // 6a02 | push 2 // 6a00 | push 0 // 6a01 | push 1 $sequence_31 = { 8d8505feffff 50 e8???????? 83c40c } // n = 4, score = 700 // 8d8505feffff | dec eax // 50 | mov eax, dword ptr [esi + 0x38] // e8???????? | // 83c40c | dec esp $sequence_32 = { e8???????? e8???????? 8bc8 e8???????? c745fcffffffff } // n = 5, score = 700 // e8???????? | // e8???????? | // 8bc8 | mov ecx, eax // e8???????? | // c745fcffffffff | mov dword ptr [ebp - 4], 0xffffffff $sequence_33 = { 488b4338 33d2 488bce 448d4220 } // n = 4, score = 600 // 488b4338 | dec eax // 33d2 | mov eax, dword ptr [ebx + 0x38] // 488bce | xor edx, edx // 448d4220 | dec eax $sequence_34 = { 488b4608 488b0e 48894628 488b4638 4c8d4c2450 448bc3 } // n = 6, score = 500 // 488b4608 | cmp eax, -1 // 488b0e | je 0x15 // 48894628 | push eax // 488b4638 | lea edx, dword ptr [esp + 8] // 4c8d4c2450 | push edx // 448bc3 | mov dword ptr [esp + 0xc], 0x30 $sequence_35 = { 488b4638 ff5060 894630 3de5030000 } // n = 4, score = 500 // 488b4638 | test eax, eax // ff5060 | je 0x1a // 894630 | cmp eax, -1 // 3de5030000 | je 0x1a $sequence_36 = { 488b0f 488901 488b07 488338ff } // n = 4, score = 500 // 488b0f | push edi // 488901 | dec eax // 488b07 | sub esp, 0x40 // 488338ff | dec eax $sequence_37 = { 488bf0 c70005000000 85db 7415 } // n = 4, score = 500 // 488bf0 | test eax, eax // c70005000000 | je 0x17 // 85db | mov esi, ecx // 7415 | mov eax, dword ptr [esi + 8] $sequence_38 = { 488b0f 48894108 488b0f 488b4108 48894128 } // n = 5, score = 500 // 488b0f | dec eax // 48894108 | mov esi, dword ptr [esp + 0x68] // 488b0f | dec eax // 488b4108 | add esp, 0x40 // 48894128 | dec eax $sequence_39 = { 4156 4157 4883ec40 488b4138 } // n = 4, score = 500 // 4156 | mov eax, dword ptr [ecx + 8] // 4157 | dec eax // 4883ec40 | mov dword ptr [ecx + 0x28], eax // 488b4138 | dec eax $sequence_40 = { 83c904 c1e803 448bc9 440fafc8 } // n = 4, score = 500 // 83c904 | push eax // c1e803 | mov dword ptr [esi + 8], 0xffffffff // 448bc9 | test byte ptr [esp + 8], 1 // 440fafc8 | je 0x18 $sequence_41 = { 488b4638 488b0e 4c8d442450 4533c9 } // n = 4, score = 500 // 488b4638 | test eax, eax // 488b0e | je 0x17 // 4c8d442450 | cmp eax, -1 // 4533c9 | je 0x17 $sequence_42 = { 488b5738 488bce 8bd8 ff92e8010000 488b6c2458 } // n = 5, score = 500 // 488b5738 | test eax, eax // 488bce | je 0x15 // 8bd8 | cmp eax, -1 // ff92e8010000 | je 0x15 // 488b6c2458 | mov eax, dword ptr [esi + 8] $sequence_43 = { 488b4108 48894128 488b0f 48396928 } // n = 4, score = 500 // 488b4108 | mov ecx, esi // 48894128 | inc esp // 488b0f | lea eax, dword ptr [edx + 0x20] // 48396928 | dec eax $sequence_44 = { 488b0f 894130 eb06 488b07 896830 33c0 } // n = 6, score = 500 // 488b0f | xor ebp, ebp // 894130 | dec eax // eb06 | mov edi, ecx // 488b07 | dec ecx // 896830 | mov esi, eax // 33c0 | dec eax $sequence_45 = { 488b07 896830 33c0 488b5c2458 488b6c2460 488b742468 4883c440 } // n = 7, score = 500 // 488b07 | mov eax, dword ptr [ecx + 0x38] // 896830 | dec eax // 33c0 | mov ecx, dword ptr [edi] // 488b5c2458 | dec eax // 488b6c2460 | mov eax, dword ptr [ecx + 8] // 488b742468 | dec eax // 4883c440 | mov dword ptr [ecx + 0x28], eax $sequence_46 = { 4889742420 57 4883ec40 33ed 488bf9 498bf0 } // n = 6, score = 500 // 4889742420 | inc ecx // 57 | push edi // 4883ec40 | dec eax // 33ed | sub esp, 0x40 // 488bf9 | dec eax // 498bf0 | mov eax, dword ptr [ecx + 0x38] $sequence_47 = { 488bcf c744242088130000 e8???????? 488b5738 } // n = 4, score = 500 // 488bcf | mov eax, dword ptr [esi + 8] // c744242088130000 | test eax, eax // e8???????? | // 488b5738 | je 0x17 $sequence_48 = { 8d8594faffff 50 68???????? ff15???????? } // n = 4, score = 200 // 8d8594faffff | pop edi // 50 | mov eax, 0xf0004 // 68???????? | // ff15???????? | $sequence_49 = { 0304b5100b4200 59 eb05 b8???????? } // n = 4, score = 100 // 0304b5100b4200 | je 0x18 // 59 | test eax, eax // eb05 | je 0x15 // b8???????? | $sequence_50 = { 001cbe 40 0023 d18a0688078a 46 } // n = 5, score = 100 // 001cbe | mov ecx, dword ptr [ebp - 0xc] // 40 | mov dword ptr fs:[0], ecx // 0023 | pop edi // d18a0688078a | pop esi // 46 | pop ebx $sequence_51 = { 0304b5100b4200 59 5e eb05 } // n = 4, score = 100 // 0304b5100b4200 | push esi // 59 | push 0 // 5e | push esi // eb05 | push 0 $sequence_52 = { 0304b5100b4200 59 eb02 8bc3 } // n = 4, score = 100 // 0304b5100b4200 | mov dword ptr [esi + 8], 0xffffffff // 59 | test byte ptr [esp + 8], 1 // eb02 | test eax, eax // 8bc3 | je 0x15 $sequence_53 = { 030c85100b4200 eb02 8bcb f6412480 } // n = 4, score = 100 // 030c85100b4200 | je 0x1a // eb02 | cmp eax, -1 // 8bcb | je 0x1a // f6412480 | mov esi, ecx $sequence_54 = { 0304b5100b4200 beffff0000 59 59 } // n = 4, score = 100 // 0304b5100b4200 | je 0x1c // beffff0000 | test eax, eax // 59 | je 0x15 // 59 | cmp eax, -1 $sequence_55 = { 013d???????? 8b04b5100b4200 0500080000 3bc8 } // n = 4, score = 100 // 013d???????? | // 8b04b5100b4200 | push eax // 0500080000 | mov dword ptr [esi + 0x14], eax // 3bc8 | xor eax, eax condition: 7 of them and filesize < 5577728 }
rule win_agent_btz_w0 { meta: author = "Symantec" source = "https://www.symantec.com/content/en/us/enterprise/media/security_response/whitepapers/waterbug-attack-group.pdf" contribution = "pnx - removed FPs" malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.agent_btz" malpedia_version = "20171113" malpedia_sharing = "TLP:WHITE" malpedia_license = "" strings: $b = {C645????} $c = {C685??FEFFFF??} $d = {FFA0??0?0000} $e = {89A8??00000068??00000056FFD78B} $f = {00004889????030000488B} $tmp_fn = "FA.tmp" condition: ((#c > 200 and #b > 200 ) or (#d > 40) and (#e > 15 or #f > 30)) and $tmp_fn }
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