Actor(s): Lazarus Group
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rule win_phandoor_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.phandoor." 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.phandoor" 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 = { 7470 833d????????00 7467 833d????????00 } // n = 4, score = 800 // 7470 | je 0x72 // 833d????????00 | // 7467 | je 0x69 // 833d????????00 | $sequence_1 = { 5e 8b4dfc 33cd b8???????? } // n = 4, score = 800 // 5e | pop esi // 8b4dfc | mov ecx, dword ptr [ebp - 4] // 33cd | xor ecx, ebp // b8???????? | $sequence_2 = { 8b96b0010000 8915???????? 8b86b4010000 a3???????? 8b8eb8010000 890d???????? 8b96bc010000 } // n = 7, score = 800 // 8b96b0010000 | mov edx, dword ptr [esi + 0x1b0] // 8915???????? | // 8b86b4010000 | mov eax, dword ptr [esi + 0x1b4] // a3???????? | // 8b8eb8010000 | mov ecx, dword ptr [esi + 0x1b8] // 890d???????? | // 8b96bc010000 | mov edx, dword ptr [esi + 0x1bc] $sequence_3 = { 0f84ba010000 833d????????00 0f84ad010000 833d????????00 } // n = 4, score = 800 // 0f84ba010000 | je 0x1c0 // 833d????????00 | // 0f84ad010000 | je 0x1b3 // 833d????????00 | $sequence_4 = { 837dec00 7509 b801000000 8be5 5d c3 33c0 } // n = 7, score = 800 // 837dec00 | cmp dword ptr [ebp - 0x14], 0 // 7509 | jne 0xb // b801000000 | mov eax, 1 // 8be5 | mov esp, ebp // 5d | pop ebp // c3 | ret // 33c0 | xor eax, eax $sequence_5 = { 755f 807f015e 7559 8bc7 8d5001 } // n = 5, score = 800 // 755f | jne 0x61 // 807f015e | cmp byte ptr [edi + 1], 0x5e // 7559 | jne 0x5b // 8bc7 | mov eax, edi // 8d5001 | lea edx, [eax + 1] $sequence_6 = { 0f84c3000000 833d????????00 0f84b6000000 833d????????00 0f84a9000000 } // n = 5, score = 800 // 0f84c3000000 | je 0xc9 // 833d????????00 | // 0f84b6000000 | je 0xbc // 833d????????00 | // 0f84a9000000 | je 0xaf $sequence_7 = { 8b8e9c010000 53 51 ff15???????? 8b55f8 52 e8???????? } // n = 7, score = 800 // 8b8e9c010000 | mov ecx, dword ptr [esi + 0x19c] // 53 | push ebx // 51 | push ecx // ff15???????? | // 8b55f8 | mov edx, dword ptr [ebp - 8] // 52 | push edx // e8???????? | $sequence_8 = { 33d2 3955e4 53 0f9dc2 c645fc02 8bf2 } // n = 6, score = 500 // 33d2 | xor edx, edx // 3955e4 | cmp dword ptr [ebp - 0x1c], edx // 53 | push ebx // 0f9dc2 | setge dl // c645fc02 | mov byte ptr [ebp - 4], 2 // 8bf2 | mov esi, edx $sequence_9 = { 0fb74d10 8b550c 6a00 51 52 8b5508 8bc8 } // n = 7, score = 500 // 0fb74d10 | movzx ecx, word ptr [ebp + 0x10] // 8b550c | mov edx, dword ptr [ebp + 0xc] // 6a00 | push 0 // 51 | push ecx // 52 | push edx // 8b5508 | mov edx, dword ptr [ebp + 8] // 8bc8 | mov ecx, eax $sequence_10 = { 740b 8a4601 46 43 84c0 7409 } // n = 6, score = 500 // 740b | je 0xd // 8a4601 | mov al, byte ptr [esi + 1] // 46 | inc esi // 43 | inc ebx // 84c0 | test al, al // 7409 | je 0xb $sequence_11 = { 0fb74d10 8b550c 6a01 51 } // n = 4, score = 500 // 0fb74d10 | movzx ecx, word ptr [ebp + 0x10] // 8b550c | mov edx, dword ptr [ebp + 0xc] // 6a01 | push 1 // 51 | push ecx $sequence_12 = { 50 e8???????? 83c404 893e 8b4604 3bc7 740c } // n = 7, score = 500 // 50 | push eax // e8???????? | // 83c404 | add esp, 4 // 893e | mov dword ptr [esi], edi // 8b4604 | mov eax, dword ptr [esi + 4] // 3bc7 | cmp eax, edi // 740c | je 0xe $sequence_13 = { 33ff 397e08 7e31 85ff } // n = 4, score = 500 // 33ff | xor edi, edi // 397e08 | cmp dword ptr [esi + 8], edi // 7e31 | jle 0x33 // 85ff | test edi, edi $sequence_14 = { 3bce 7705 83f8ff 760a } // n = 4, score = 500 // 3bce | cmp ecx, esi // 7705 | ja 7 // 83f8ff | cmp eax, -1 // 760a | jbe 0xc $sequence_15 = { 50 ffd7 83c624 833e00 75ea 85c0 7505 } // n = 7, score = 500 // 50 | push eax // ffd7 | call edi // 83c624 | add esi, 0x24 // 833e00 | cmp dword ptr [esi], 0 // 75ea | jne 0xffffffec // 85c0 | test eax, eax // 7505 | jne 7 condition: 7 of them and filesize < 2124800 }
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