Actor(s): Leviathan
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rule win_dadstache_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2021-10-07" version = "1" description = "Detects win.dadstache." 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.dadstache" 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 = { 50 6a1f ff35???????? ff15???????? 803d????????00 } // n = 5, score = 500 // 50 | push eax // 6a1f | push 0x1f // ff35???????? | // ff15???????? | // 803d????????00 | $sequence_1 = { 6a00 f3a4 50 ff15???????? 85c0 7528 ff7304 } // n = 7, score = 500 // 6a00 | push 0 // f3a4 | rep movsb byte ptr es:[edi], byte ptr [esi] // 50 | push eax // ff15???????? | // 85c0 | test eax, eax // 7528 | jne 0x2a // ff7304 | push dword ptr [ebx + 4] $sequence_2 = { 0f1000 c745fc09000000 895508 0f1145e4 8b7df0 8bcf c1e908 } // n = 7, score = 500 // 0f1000 | movups xmm0, xmmword ptr [eax] // c745fc09000000 | mov dword ptr [ebp - 4], 9 // 895508 | mov dword ptr [ebp + 8], edx // 0f1145e4 | movups xmmword ptr [ebp - 0x1c], xmm0 // 8b7df0 | mov edi, dword ptr [ebp - 0x10] // 8bcf | mov ecx, edi // c1e908 | shr ecx, 8 $sequence_3 = { 55 8bec 51 56 8b7508 837e7000 0f84da000000 } // n = 7, score = 500 // 55 | push ebp // 8bec | mov ebp, esp // 51 | push ecx // 56 | push esi // 8b7508 | mov esi, dword ptr [ebp + 8] // 837e7000 | cmp dword ptr [esi + 0x70], 0 // 0f84da000000 | je 0xe0 $sequence_4 = { ff35???????? ff15???????? 85c0 741f 6a00 } // n = 5, score = 500 // ff35???????? | // ff15???????? | // 85c0 | test eax, eax // 741f | je 0x21 // 6a00 | push 0 $sequence_5 = { 8d45fc c745fc00000000 50 6a00 51 6a00 6800130000 } // n = 7, score = 500 // 8d45fc | lea eax, dword ptr [ebp - 4] // c745fc00000000 | mov dword ptr [ebp - 4], 0 // 50 | push eax // 6a00 | push 0 // 51 | push ecx // 6a00 | push 0 // 6800130000 | push 0x1300 $sequence_6 = { 0f1105???????? 0fb68699010000 50 0fb68698010000 50 0fb68697010000 } // n = 6, score = 500 // 0f1105???????? | // 0fb68699010000 | movzx eax, byte ptr [esi + 0x199] // 50 | push eax // 0fb68698010000 | movzx eax, byte ptr [esi + 0x198] // 50 | push eax // 0fb68697010000 | movzx eax, byte ptr [esi + 0x197] $sequence_7 = { 8b4704 314604 8b01 314608 8b470c 8bf9 31460c } // n = 7, score = 500 // 8b4704 | mov eax, dword ptr [edi + 4] // 314604 | xor dword ptr [esi + 4], eax // 8b01 | mov eax, dword ptr [ecx] // 314608 | xor dword ptr [esi + 8], eax // 8b470c | mov eax, dword ptr [edi + 0xc] // 8bf9 | mov edi, ecx // 31460c | xor dword ptr [esi + 0xc], eax $sequence_8 = { 660f6e805cffffff 660febfc 660f62e8 660f6e8060ffffff } // n = 4, score = 200 // 660f6e805cffffff | movd xmm0, dword ptr [eax - 0xa4] // 660febfc | por xmm7, xmm4 // 660f62e8 | punpckldq xmm5, xmm0 // 660f6e8060ffffff | movd xmm0, dword ptr [eax - 0xa0] $sequence_9 = { 8bf1 03c3 2bf0 0f1f8000000000 8a0c06 8d4001 8a50ff } // n = 7, score = 200 // 8bf1 | mov esi, ecx // 03c3 | add eax, ebx // 2bf0 | sub esi, eax // 0f1f8000000000 | nop dword ptr [eax] // 8a0c06 | mov cl, byte ptr [esi + eax] // 8d4001 | lea eax, dword ptr [eax + 1] // 8a50ff | mov dl, byte ptr [eax - 1] $sequence_10 = { 750a 56 ff55ec 8bd8 85db 7459 } // n = 6, score = 200 // 750a | jne 0xc // 56 | push esi // ff55ec | call dword ptr [ebp - 0x14] // 8bd8 | mov ebx, eax // 85db | test ebx, ebx // 7459 | je 0x5b $sequence_11 = { c7411806000000 33c0 5e c3 6a00 } // n = 5, score = 200 // c7411806000000 | mov dword ptr [ecx + 0x18], 6 // 33c0 | xor eax, eax // 5e | pop esi // c3 | ret // 6a00 | push 0 $sequence_12 = { 0f8401010000 6a20 6a40 ffd6 } // n = 4, score = 200 // 0f8401010000 | je 0x107 // 6a20 | push 0x20 // 6a40 | push 0x40 // ffd6 | call esi $sequence_13 = { 85f6 7418 8b06 85c0 7412 6a00 6a01 } // n = 7, score = 200 // 85f6 | test esi, esi // 7418 | je 0x1a // 8b06 | mov eax, dword ptr [esi] // 85c0 | test eax, eax // 7412 | je 0x14 // 6a00 | push 0 // 6a01 | push 1 $sequence_14 = { 660f62d9 0f57f6 660f6e8834ffffff 660ffedd 660f6ea80cffffff 660f62ca } // n = 6, score = 200 // 660f62d9 | punpckldq xmm3, xmm1 // 0f57f6 | xorps xmm6, xmm6 // 660f6e8834ffffff | movd xmm1, dword ptr [eax - 0xcc] // 660ffedd | paddd xmm3, xmm5 // 660f6ea80cffffff | movd xmm5, dword ptr [eax - 0xf4] // 660f62ca | punpckldq xmm1, xmm2 $sequence_15 = { 8bf1 85f6 743b 8b460c 85c0 7434 837e1400 } // n = 7, score = 200 // 8bf1 | mov esi, ecx // 85f6 | test esi, esi // 743b | je 0x3d // 8b460c | mov eax, dword ptr [esi + 0xc] // 85c0 | test eax, eax // 7434 | je 0x36 // 837e1400 | cmp dword ptr [esi + 0x14], 0 condition: 7 of them and filesize < 580608 }
rule win_dadstache_w0 { meta: author = "Elastic Security" description = "APT40 second stage implant" source = "https://www.elastic.co/blog/advanced-techniques-used-in-malaysian-focused-apt-campaign" malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.dadstache" malpedia_version = "20200626" malpedia_license = "CC BY-NC-SA 4.0" malpedia_sharing = "TLP:WHITE" strings: $a = "/list_direction" fullword wide $b = "/post_document" fullword wide $c = "/postlogin" fullword wide $d = "Download Read Path Failed %s" fullword ascii $e = "Open Pipe Failed %s" fullword ascii $f = "Open Remote File %s Failed For: %s" fullword ascii $g = "Download Read Path Failed %s" fullword ascii $h = "\\cmd.exe" fullword wide condition: all of them }
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