Actor(s): TA505
Cisco Talos reports that this is a data exfiltration tool used by TA505.
rule win_teleport_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.teleport." 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.teleport" 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 = { 0f85a0feffff 8b9de0feffff 8b851cffffff 8bbd24ffffff 8b4f04 837910ff } // n = 6, score = 100 // 0f85a0feffff | jne 0xfffffea6 // 8b9de0feffff | mov ebx, dword ptr [ebp - 0x120] // 8b851cffffff | mov eax, dword ptr [ebp - 0xe4] // 8bbd24ffffff | mov edi, dword ptr [ebp - 0xdc] // 8b4f04 | mov ecx, dword ptr [edi + 4] // 837910ff | cmp dword ptr [ecx + 0x10], -1 $sequence_1 = { 7402 fec6 0fb6f6 8d85f8feffff 56 8831 41 } // n = 7, score = 100 // 7402 | je 4 // fec6 | inc dh // 0fb6f6 | movzx esi, dh // 8d85f8feffff | lea eax, [ebp - 0x108] // 56 | push esi // 8831 | mov byte ptr [ecx], dh // 41 | inc ecx $sequence_2 = { 899de4e5ffff e8???????? 83cb08 f6c304 740e 8d8ddce5ffff 83e3fb } // n = 7, score = 100 // 899de4e5ffff | mov dword ptr [ebp - 0x1a1c], ebx // e8???????? | // 83cb08 | or ebx, 8 // f6c304 | test bl, 4 // 740e | je 0x10 // 8d8ddce5ffff | lea ecx, [ebp - 0x1a24] // 83e3fb | and ebx, 0xfffffffb $sequence_3 = { e8???????? 0f1085e8fdffff 0f1106 f30f7e8508feffff 660fd64610 eb3a 8b55d4 } // n = 7, score = 100 // e8???????? | // 0f1085e8fdffff | movups xmm0, xmmword ptr [ebp - 0x218] // 0f1106 | movups xmmword ptr [esi], xmm0 // f30f7e8508feffff | movq xmm0, qword ptr [ebp - 0x1f8] // 660fd64610 | movq qword ptr [esi + 0x10], xmm0 // eb3a | jmp 0x3c // 8b55d4 | mov edx, dword ptr [ebp - 0x2c] $sequence_4 = { e9???????? 6800080000 8d85f0f7ffff 6a00 50 e8???????? 83c40c } // n = 7, score = 100 // e9???????? | // 6800080000 | push 0x800 // 8d85f0f7ffff | lea eax, [ebp - 0x810] // 6a00 | push 0 // 50 | push eax // e8???????? | // 83c40c | add esp, 0xc $sequence_5 = { 0f84e9030000 e9???????? 55 8bec ff7508 e8???????? 59 } // n = 7, score = 100 // 0f84e9030000 | je 0x3ef // e9???????? | // 55 | push ebp // 8bec | mov ebp, esp // ff7508 | push dword ptr [ebp + 8] // e8???????? | // 59 | pop ecx $sequence_6 = { 83c40c 8b5320 8b4b24 b301 8955e8 8d3c47 894dec } // n = 7, score = 100 // 83c40c | add esp, 0xc // 8b5320 | mov edx, dword ptr [ebx + 0x20] // 8b4b24 | mov ecx, dword ptr [ebx + 0x24] // b301 | mov bl, 1 // 8955e8 | mov dword ptr [ebp - 0x18], edx // 8d3c47 | lea edi, [edi + eax*2] // 894dec | mov dword ptr [ebp - 0x14], ecx $sequence_7 = { 51 e8???????? 83c408 8d8d30ffffff c745fcffffffff e8???????? 8b36 } // n = 7, score = 100 // 51 | push ecx // e8???????? | // 83c408 | add esp, 8 // 8d8d30ffffff | lea ecx, [ebp - 0xd0] // c745fcffffffff | mov dword ptr [ebp - 4], 0xffffffff // e8???????? | // 8b36 | mov esi, dword ptr [esi] $sequence_8 = { c1e808 0fb6c0 331c85a0da4200 0fb6c2 8b55e4 331c85a0d64200 8bc2 } // n = 7, score = 100 // c1e808 | shr eax, 8 // 0fb6c0 | movzx eax, al // 331c85a0da4200 | xor ebx, dword ptr [eax*4 + 0x42daa0] // 0fb6c2 | movzx eax, dl // 8b55e4 | mov edx, dword ptr [ebp - 0x1c] // 331c85a0d64200 | xor ebx, dword ptr [eax*4 + 0x42d6a0] // 8bc2 | mov eax, edx $sequence_9 = { 8d8010324300 8945e4 803800 8bc8 7435 8a4101 84c0 } // n = 7, score = 100 // 8d8010324300 | lea eax, [eax + 0x433210] // 8945e4 | mov dword ptr [ebp - 0x1c], eax // 803800 | cmp byte ptr [eax], 0 // 8bc8 | mov ecx, eax // 7435 | je 0x37 // 8a4101 | mov al, byte ptr [ecx + 1] // 84c0 | test al, al condition: 7 of them and filesize < 458752 }
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