There is no description at this point.
rule win_robinhood_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2020-10-14" version = "1" description = "autogenerated rule brought to you by yara-signator" tool = "yara-signator v0.5.0" signator_config = "callsandjumps;datarefs;binvalue" malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.robinhood" malpedia_rule_date = "20201014" malpedia_hash = "a7e3bd57eaf12bf3ea29a863c041091ba3af9ac9" malpedia_version = "20201014" 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 = { 8d2de08b5d00 8d74cd00 8b3e 01df 8b5a04 8b7604 893a } // n = 7, score = 100 // 8d2de08b5d00 | lea ebp, [0x5d8be0] // 8d74cd00 | lea esi, [ebp + ecx*8] // 8b3e | mov edi, dword ptr [esi] // 01df | add edi, ebx // 8b5a04 | mov ebx, dword ptr [edx + 4] // 8b7604 | mov esi, dword ptr [esi + 4] // 893a | mov dword ptr [edx], edi $sequence_1 = { 8d05c07a4f00 890424 8d05c0675300 89442404 e8???????? 0f0b 8d05c07a4f00 } // n = 7, score = 100 // 8d05c07a4f00 | lea eax, [0x4f7ac0] // 890424 | mov dword ptr [esp], eax // 8d05c0675300 | lea eax, [0x5367c0] // 89442404 | mov dword ptr [esp + 4], eax // e8???????? | // 0f0b | ud2 // 8d05c07a4f00 | lea eax, [0x4f7ac0] $sequence_2 = { 895110 8d1dfcf35f00 891c24 c744240401000000 e8???????? 8b4c2420 8b5114 } // n = 7, score = 100 // 895110 | mov dword ptr [ecx + 0x10], edx // 8d1dfcf35f00 | lea ebx, [0x5ff3fc] // 891c24 | mov dword ptr [esp], ebx // c744240401000000 | mov dword ptr [esp + 4], 1 // e8???????? | // 8b4c2420 | mov ecx, dword ptr [esp + 0x20] // 8b5114 | mov edx, dword ptr [ecx + 0x14] $sequence_3 = { c744240800000000 e8???????? 0fb644240c 84c0 74be 8d05e0f55f00 890424 } // n = 7, score = 100 // c744240800000000 | mov dword ptr [esp + 8], 0 // e8???????? | // 0fb644240c | movzx eax, byte ptr [esp + 0xc] // 84c0 | test al, al // 74be | je 0xffffffc0 // 8d05e0f55f00 | lea eax, [0x5ff5e0] // 890424 | mov dword ptr [esp], eax $sequence_4 = { 8b4110 8b8c24a0020000 890c24 ffd0 8b442404 8b4c2408 8d942418020000 } // n = 7, score = 100 // 8b4110 | mov eax, dword ptr [ecx + 0x10] // 8b8c24a0020000 | mov ecx, dword ptr [esp + 0x2a0] // 890c24 | mov dword ptr [esp], ecx // ffd0 | call eax // 8b442404 | mov eax, dword ptr [esp + 4] // 8b4c2408 | mov ecx, dword ptr [esp + 8] // 8d942418020000 | lea edx, [esp + 0x218] $sequence_5 = { c744240800000000 c744240c0a000000 c644241000 8d0d8d595100 894c2414 c744241811000000 e8???????? } // n = 7, score = 100 // c744240800000000 | mov dword ptr [esp + 8], 0 // c744240c0a000000 | mov dword ptr [esp + 0xc], 0xa // c644241000 | mov byte ptr [esp + 0x10], 0 // 8d0d8d595100 | lea ecx, [0x51598d] // 894c2414 | mov dword ptr [esp + 0x14], ecx // c744241811000000 | mov dword ptr [esp + 0x18], 0x11 // e8???????? | $sequence_6 = { 8b05???????? 89442424 8d0d60824f00 890c24 8b542420 89542404 8d1d94345100 } // n = 7, score = 100 // 8b05???????? | // 89442424 | mov dword ptr [esp + 0x24], eax // 8d0d60824f00 | lea ecx, [0x4f8260] // 890c24 | mov dword ptr [esp], ecx // 8b542420 | mov edx, dword ptr [esp + 0x20] // 89542404 | mov dword ptr [esp + 4], edx // 8d1d94345100 | lea ebx, [0x513494] $sequence_7 = { ebab e8???????? 8d05b0ea5100 890424 c744240436000000 e8???????? e8???????? } // n = 7, score = 100 // ebab | jmp 0xffffffad // e8???????? | // 8d05b0ea5100 | lea eax, [0x51eab0] // 890424 | mov dword ptr [esp], eax // c744240436000000 | mov dword ptr [esp + 4], 0x36 // e8???????? | // e8???????? | $sequence_8 = { 890424 8d442414 89442404 e8???????? 8d0540f55f00 890424 e8???????? } // n = 7, score = 100 // 890424 | mov dword ptr [esp], eax // 8d442414 | lea eax, [esp + 0x14] // 89442404 | mov dword ptr [esp + 4], eax // e8???????? | // 8d0540f55f00 | lea eax, [0x5ff540] // 890424 | mov dword ptr [esp], eax // e8???????? | $sequence_9 = { 8d4808 31d2 ebb2 8d0500fb5f00 8944241c c644242000 83c40c } // n = 7, score = 100 // 8d4808 | lea ecx, [eax + 8] // 31d2 | xor edx, edx // ebb2 | jmp 0xffffffb4 // 8d0500fb5f00 | lea eax, [0x5ffb00] // 8944241c | mov dword ptr [esp + 0x1c], eax // c644242000 | mov byte ptr [esp + 0x20], 0 // 83c40c | add esp, 0xc condition: 7 of them and filesize < 5955584 }
rule win_robinhood_w0 { meta: author = "anonymous submission" description = "Unpacked RobinHood ransomware" malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.robinhood" malpedia_version = "20190510" malpedia_license = "CC BY-NC-SA 4.0" malpedia_sharing = "TLP:WHITE" strings: $go1 = "go.buildid" $go2 = "Go build ID:" $rh1 = "c:\\windows\\temp\\pub.key" nocase $rh2 = ".enc_robbinhood" nocase $rh3 = "cmd.exe /c net use * /DELETE /Y" nocase $rh4 = "CoolMaker" nocase $rh5= "ShadowFucks" nocase $rh6= "RecoveryFCK" nocase $rh7= "ServiceFuck" nocase condition: all of ($go*) and any of ($rh*) }
If your designated proposal does not fit in any other category, feel free to write a free-text in the comment field below. Changes regarding references should be proposed on the Malpedia library page.
Your suggestion will be reviewed before being published. Thank you for contributing!
YYYY-MM-DD
YYYY-MM
YYYY