Actor(s): Sofacy
There is no description at this point.
rule win_xagent_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2020-05-30" version = "1" description = "autogenerated rule brought to you by yara-signator" tool = "yara-signator v0.4.0" tool_config = "callsandjumps;datarefs;binvalue" malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.xagent" malpedia_rule_date = "20200529" malpedia_hash = "92c362319514e5a6da26204961446caa3a8b32a8" malpedia_version = "20200529" 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 / approach 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 = { b001 eb02 32c0 3c01 } // n = 4, score = 3200 // b001 | mov al, 1 // eb02 | jmp 4 // 32c0 | xor al, al // 3c01 | cmp al, 1 $sequence_1 = { c1ea02 6bd20d b801000000 2bc2 } // n = 4, score = 3000 // c1ea02 | shr edx, 2 // 6bd20d | imul edx, edx, 0xd // b801000000 | mov eax, 1 // 2bc2 | sub eax, edx $sequence_2 = { ff15???????? 8bd8 e8???????? 03d8 } // n = 4, score = 3000 // ff15???????? | // 8bd8 | mov ebx, eax // e8???????? | // 03d8 | add ebx, eax $sequence_3 = { 03ff 03ff 3b7e0c 7707 } // n = 4, score = 2500 // 03ff | mov eax, dword ptr [ebx] // 03ff | je 0x60 // 3b7e0c | call dword ptr [eax + 0x38] // 7707 | test ecx, ecx $sequence_4 = { 7702 2bc7 8b5204 8b0482 8b0488 } // n = 5, score = 2500 // 7702 | xor edx, edx // 2bc7 | dec eax // 8b5204 | mov ecx, eax // 8b0482 | dec eax // 8b0488 | mov ebx, dword ptr [esp + 0x40] $sequence_5 = { 7707 c7460c00000000 49 894e10 7507 } // n = 5, score = 2500 // 7707 | shr eax, 2 // c7460c00000000 | mov ecx, dword ptr [eax + 8] // 49 | mov eax, ecx // 894e10 | push edi // 7507 | mov edi, dword ptr [edx + 8] $sequence_6 = { 85c9 7423 8b7e08 ff460c 03ff 03ff } // n = 6, score = 2500 // 85c9 | jmp 0x1d // 7423 | sbb eax, eax // 8b7e08 | sbb eax, -1 // ff460c | test eax, eax // 03ff | mov eax, ecx // 03ff | jmp 0x28 $sequence_7 = { 8b4808 8bc1 57 8b7a08 c1e802 } // n = 5, score = 2500 // 8b4808 | sbb eax, eax // 8bc1 | mov edx, 0x1f4 // 57 | dec eax // 8b7a08 | mov ecx, ebx // c1e802 | mov eax, 0xa57eb503 $sequence_8 = { ff15???????? 6a08 e8???????? 83c404 85c0 } // n = 5, score = 2500 // ff15???????? | // 6a08 | mov ecx, dword ptr [esi + 0x10] // e8???????? | // 83c404 | test ecx, ecx // 85c0 | je 0x56 $sequence_9 = { 85c0 7407 8b4d08 8b11 8910 } // n = 5, score = 2500 // 85c0 | sbb eax, eax // 7407 | sbb eax, -1 // 8b4d08 | jne 0x2e // 8b11 | mov eax, ecx // 8910 | jmp 7 $sequence_10 = { c7460c00000000 5f 5e 8be5 } // n = 4, score = 2500 // c7460c00000000 | je 0x25 // 5f | mov edi, dword ptr [esi + 8] // 5e | inc dword ptr [esi + 0xc] // 8be5 | add edi, edi $sequence_11 = { 83ff08 740e 83ff0b 7409 83ff0d } // n = 5, score = 2100 // 83ff08 | cmp edi, 8 // 740e | je 0x10 // 83ff0b | cmp edi, 0xb // 7409 | je 0xb // 83ff0d | cmp edi, 0xd $sequence_12 = { 48895c2408 48896c2410 4889742418 57 4883ec30 4883792800 } // n = 6, score = 1500 // 48895c2408 | dec eax // 48896c2410 | mov eax, dword ptr [edi] // 4889742418 | dec esp // 57 | mov edx, dword ptr [ebx] // 4883ec30 | dec eax // 4883792800 | mov dword ptr [ebx], eax $sequence_13 = { 740c 488b07 488b0b 488903 48890f 488b5c2430 488b6c2438 } // n = 7, score = 1500 // 740c | ja 9 // 488b07 | sub eax, edi // 488b0b | jne 6 // 488903 | mov al, 1 // 48890f | jmp 6 // 488b5c2430 | xor al, al // 488b6c2438 | cmp al, 1 $sequence_14 = { 482bc2 48d1f8 488be8 4885c0 } // n = 4, score = 1500 // 482bc2 | mov ebp, edx // 48d1f8 | dec eax // 488be8 | mov ebx, ecx // 4885c0 | je 0xe $sequence_15 = { 4c8b13 488903 4c8917 488b13 } // n = 4, score = 1500 // 4c8b13 | dec esp // 488903 | mov edx, dword ptr [ebx] // 4c8917 | dec eax // 488b13 | mov dword ptr [ebx], eax $sequence_16 = { 84c0 740c 488b07 4c8b13 } // n = 4, score = 1500 // 84c0 | mov edx, dword ptr [edx + 4] // 740c | mov eax, dword ptr [edx + eax*4] // 488b07 | mov eax, dword ptr [eax + ecx*4] // 4c8b13 | mov ecx, dword ptr [esi + 0x10] $sequence_17 = { 57 4883ec30 4883792800 498bf9 498bf0 488bea 488bd9 } // n = 7, score = 1500 // 57 | dec esp // 4883ec30 | mov dword ptr [edi], edx // 4883792800 | dec eax // 498bf9 | mov edx, dword ptr [ebx] // 498bf0 | push edi // 488bea | dec eax // 488bd9 | sub esp, 0x30 $sequence_18 = { 740d 488bc8 e8???????? 4c8be0 eb03 4c8be3 } // n = 6, score = 1000 // 740d | dec eax // 488bc8 | mov ebp, eax // e8???????? | // 4c8be0 | dec eax // eb03 | test eax, eax // 4c8be3 | dec eax $sequence_19 = { 7504 8bc1 eb05 1bc0 83d8ff 85c0 } // n = 6, score = 900 // 7504 | dec eax // 8bc1 | mov dword ptr [esp + 0x10], ebp // eb05 | dec eax // 1bc0 | mov dword ptr [esp + 0x18], esi // 83d8ff | push edi // 85c0 | dec eax $sequence_20 = { ff15???????? baf4010000 488bcb ff15???????? } // n = 4, score = 600 // ff15???????? | // baf4010000 | dec esp // 488bcb | mov esp, ebx // ff15???????? | $sequence_21 = { b803b57ea5 f7e6 c1ea06 6bd263 } // n = 4, score = 500 // b803b57ea5 | dec eax // f7e6 | mov ecx, eax // c1ea06 | dec esp // 6bd263 | mov esp, eax $sequence_22 = { 33d2 488bc8 ff15???????? 488b5c2440 } // n = 4, score = 400 // 33d2 | jmp 0x20 // 488bc8 | dec esp // ff15???????? | // 488b5c2440 | mov esp, ebx $sequence_23 = { c1ea07 69d295000000 2bca 8bd1 } // n = 4, score = 400 // c1ea07 | jmp 0x10 // 69d295000000 | dec esp // 2bca | mov esp, ebx // 8bd1 | dec eax $sequence_24 = { 0f8469030000 488b8c24b8000000 488bd6 e8???????? 488bc8 488bf8 } // n = 6, score = 200 // 0f8469030000 | jmp 7 // 488b8c24b8000000 | sbb eax, eax // 488bd6 | sbb eax, -1 // e8???????? | // 488bc8 | test eax, eax // 488bf8 | jne 0xf $sequence_25 = { 488b05???????? 4889855e160000 0fb705???????? 66898566160000 } // n = 4, score = 200 // 488b05???????? | // 4889855e160000 | jne 0x26 // 0fb705???????? | // 66898566160000 | mov eax, ecx condition: 7 of them and filesize < 729088 }
rule win_xagent_w0 { meta: description = "Sofacy Group Malware Sample 3" author = "Florian Roth" reference = "http://dokumente.linksfraktion.de/inhalt/report-orig.pdf" date = "2015-06-19" hash = "5f6b2a0d1d966fc4f1ed292b46240767f4acb06c13512b0061b434ae2a692fa1" source = "https://github.com/mattulm/sfiles_yara/blob/master/malware/sofacy_xtunnel_bundestag.yar" malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.xagent" malpedia_version = "20170517" malpedia_license = "CC BY-NC-SA 4.0" malpedia_sharing = "TLP:WHITE" strings: $s1 = "shell\\open\\command=\"System Volume Information\\USBGuard.exe\" install" fullword ascii $s2 = ".?AVAgentModuleRemoteKeyLogger@@" fullword ascii $s3 = "<font size=4 color=red>process isn't exist</font>" fullword ascii $s4 = "<font size=4 color=red>process is exist</font>" fullword ascii $s5 = ".winnt.check-fix.com" fullword ascii $s6 = ".update.adobeincorp.com" fullword ascii $s7 = ".microsoft.checkwinframe.com" fullword ascii $s8 = "adobeincorp.com" fullword wide $s9 = "# EXC: HttpSender - Cannot create Get Channel!" fullword ascii $x1 = "User-Agent: Mozilla/5.0 (Windows NT 6.2; WOW64; rv:20.0) Gecko/20100101 Firefox/" wide $x2 = "User-Agent: Mozilla/5.0 (Windows NT 6.; WOW64; rv:20.0) Gecko/20100101 Firefox/2" wide $x3 = "C:\\Windows\\System32\\cmd.exe" fullword wide condition: uint16(0) == 0x5a4d and filesize < 300KB and ( 2 of ($s*) or ( 1 of ($s*) and all of ($x*) ) ) }
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