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 = "2021-10-07" version = "1" description = "Detects win.xagent." 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.xagent" malpedia_rule_date = "20211007" malpedia_hash = "e5b790e0f888f252d49063a1251ca60ec2832535" malpedia_version = "20211008" 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 = { 7504 b001 eb02 32c0 3c01 } // n = 5, score = 3300 // 7504 | jne 6 // b001 | mov al, 1 // eb02 | jmp 4 // 32c0 | xor al, al // 3c01 | cmp al, 1 $sequence_1 = { c1ea02 6bd20d b801000000 2bc2 } // n = 4, score = 3100 // 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 = 3100 // ff15???????? | // 8bd8 | mov ebx, eax // e8???????? | // 03d8 | add ebx, eax $sequence_3 = { c7460c00000000 5f 5e 8be5 } // n = 4, score = 2600 // c7460c00000000 | mov dword ptr [esi + 0xc], 0 // 5f | pop edi // 5e | pop esi // 8be5 | mov esp, ebp $sequence_4 = { eb02 8b11 8b4808 8bc1 57 } // n = 5, score = 2600 // eb02 | jmp 4 // 8b11 | mov edx, dword ptr [ecx] // 8b4808 | mov ecx, dword ptr [eax + 8] // 8bc1 | mov eax, ecx // 57 | push edi $sequence_5 = { c20400 8d4de4 e8???????? b8???????? } // n = 4, score = 2600 // c20400 | ret 4 // 8d4de4 | lea ecx, dword ptr [ebp - 0x1c] // e8???????? | // b8???????? | $sequence_6 = { 7707 c7460c00000000 49 894e10 7507 c7460c00000000 5f } // n = 7, score = 2600 // 7707 | mov ecx, dword ptr [ebx] // c7460c00000000 | dec eax // 49 | mov dword ptr [ebx], eax // 894e10 | dec eax // 7507 | mov dword ptr [edi], ecx // c7460c00000000 | dec eax // 5f | mov ebx, dword ptr [esp + 0x30] $sequence_7 = { 8bce e8???????? 8b08 85c9 7504 33d2 } // n = 6, score = 2600 // 8bce | mov ecx, esi // e8???????? | // 8b08 | mov ecx, dword ptr [eax] // 85c9 | test ecx, ecx // 7504 | jne 6 // 33d2 | xor edx, edx $sequence_8 = { e8???????? 2bca 40 c1f902 3bc1 7623 } // n = 6, score = 2600 // e8???????? | // 2bca | sub ecx, edx // 40 | inc eax // c1f902 | sar ecx, 2 // 3bc1 | cmp eax, ecx // 7623 | jbe 0x25 $sequence_9 = { ff460c 03ff 03ff 3b7e0c 7707 c7460c00000000 49 } // n = 7, score = 2600 // ff460c | inc dword ptr [esi + 0xc] // 03ff | add edi, edi // 03ff | add edi, edi // 3b7e0c | cmp edi, dword ptr [esi + 0xc] // 7707 | ja 9 // c7460c00000000 | mov dword ptr [esi + 0xc], 0 // 49 | dec ecx $sequence_10 = { 8d4dc8 e8???????? b8???????? c3 } // n = 4, score = 2600 // 8d4dc8 | lea ecx, dword ptr [ebp - 0x38] // e8???????? | // b8???????? | // c3 | ret $sequence_11 = { 83ff08 740e 83ff0b 7409 } // n = 4, score = 2200 // 83ff08 | cmp edi, 8 // 740e | je 0x10 // 83ff0b | cmp edi, 0xb // 7409 | je 0xb $sequence_12 = { e8???????? 488d542458 488bcb e8???????? 90 } // n = 5, score = 1500 // e8???????? | // 488d542458 | dec eax // 488bcb | lea edx, dword ptr [esp + 0x58] // e8???????? | // 90 | dec eax $sequence_13 = { 0f92c3 488d4c2430 e8???????? 90 } // n = 4, score = 1500 // 0f92c3 | mov eax, dword ptr [edi] // 488d4c2430 | dec esp // e8???????? | // 90 | mov edx, dword ptr [ebx] $sequence_14 = { ff15???????? 488b0b ff15???????? 4883c308 } // n = 4, score = 1500 // ff15???????? | // 488b0b | je 0xe // ff15???????? | // 4883c308 | dec eax $sequence_15 = { e8???????? 498bce 4e8d0437 482bcf } // n = 4, score = 1500 // e8???????? | // 498bce | je 0x10 // 4e8d0437 | dec eax // 482bcf | mov eax, dword ptr [edi] $sequence_16 = { 4883ec20 488b5910 4885db 7415 488b0b } // n = 5, score = 1500 // 4883ec20 | test al, al // 488b5910 | je 0x10 // 4885db | dec eax // 7415 | mov eax, dword ptr [edi] // 488b0b | dec eax $sequence_17 = { 84c0 740c 488b07 4c8b13 } // n = 4, score = 1500 // 84c0 | dec eax // 740c | mov ecx, dword ptr [ebx] // 488b07 | dec eax // 4c8b13 | mov dword ptr [ebx], eax $sequence_18 = { 740c 488b07 488b0b 488903 48890f } // n = 5, score = 1500 // 740c | mov ecx, ebx // 488b07 | nop // 488b0b | je 0xe // 488903 | dec eax // 48890f | mov eax, dword ptr [edi] $sequence_19 = { e8???????? 488b4328 4c8bcf 4c8bc6 } // n = 4, score = 1500 // e8???????? | // 488b4328 | mov eax, dword ptr [edi] // 4c8bcf | dec eax // 4c8bc6 | mov ecx, dword ptr [ebx] $sequence_20 = { 4885c0 740d 488bc8 e8???????? 4c8be0 } // n = 5, score = 1200 // 4885c0 | sub eax, edx // 740d | mov ebx, eax // 488bc8 | add ebx, eax // e8???????? | // 4c8be0 | je 0x10 $sequence_21 = { e8???????? 4c8be0 eb03 4c8be3 } // n = 4, score = 1000 // e8???????? | // 4c8be0 | mov ecx, esi // eb03 | dec esi // 4c8be3 | lea eax, dword ptr [edi + esi] $sequence_22 = { ff15???????? baf4010000 488bcb ff15???????? } // n = 4, score = 600 // ff15???????? | // baf4010000 | dec eax // 488bcb | sub ecx, edi // ff15???????? | $sequence_23 = { b803b57ea5 f7e6 c1ea06 6bd263 } // n = 4, score = 500 // b803b57ea5 | je 0xe // f7e6 | dec eax // c1ea06 | mov eax, dword ptr [edi] // 6bd263 | dec esp $sequence_24 = { c1ea07 69d295000000 2bca 8bd1 } // n = 4, score = 400 // c1ea07 | je 0xe // 69d295000000 | dec eax // 2bca | mov eax, dword ptr [edi] // 8bd1 | dec esp $sequence_25 = { 7408 498bcc e8???????? 488bc3 } // n = 4, score = 400 // 7408 | mov edx, dword ptr [ebx] // 498bcc | dec eax // e8???????? | // 488bc3 | mov dword ptr [ebx], eax $sequence_26 = { 75f7 492bef 4c8be0 4885c0 7505 } // n = 5, score = 200 // 75f7 | mov edx, dword ptr [ebx] // 492bef | dec eax // 4c8be0 | mov dword ptr [ebx], eax // 4885c0 | dec esp // 7505 | mov dword ptr [edi], edx $sequence_27 = { 75f7 498bcc 4c2bc2 e8???????? } // n = 4, score = 200 // 75f7 | mov eax, dword ptr [edi] // 498bcc | dec eax // 4c2bc2 | mov ecx, dword ptr [ebx] // e8???????? | 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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