Actor(s): Lazarus Group
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rule win_unidentified_042_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.unidentified_042." 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.unidentified_042" 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 = { 01857cffffff 014580 03f0 03c8 03f8 83fe31 0f8ca8feffff } // n = 7, score = 100 // 01857cffffff | add dword ptr [ebp - 0x84], eax // 014580 | add dword ptr [ebp - 0x80], eax // 03f0 | add esi, eax // 03c8 | add ecx, eax // 03f8 | add edi, eax // 83fe31 | cmp esi, 0x31 // 0f8ca8feffff | jl 0xfffffeae $sequence_1 = { bf???????? eb36 c745fc???????? bf???????? eb28 c745fc???????? bf???????? } // n = 7, score = 100 // bf???????? | // eb36 | jmp 0x38 // c745fc???????? | // bf???????? | // eb28 | jmp 0x2a // c745fc???????? | // bf???????? | $sequence_2 = { 56 c745e401234567 c745e889abcdef c745ecfedcba98 c745f076543210 c745f4f0e1d2c3 894598 } // n = 7, score = 100 // 56 | push esi // c745e401234567 | mov dword ptr [ebp - 0x1c], 0x67452301 // c745e889abcdef | mov dword ptr [ebp - 0x18], 0xefcdab89 // c745ecfedcba98 | mov dword ptr [ebp - 0x14], 0x98badcfe // c745f076543210 | mov dword ptr [ebp - 0x10], 0x10325476 // c745f4f0e1d2c3 | mov dword ptr [ebp - 0xc], 0xc3d2e1f0 // 894598 | mov dword ptr [ebp - 0x68], eax $sequence_3 = { c78528f8ffff8444e610 c7852cf8ffff585d2200 c78530f8ffffd1516a05 c78534f8ffff6eb8bfa6 c78538f8ffffe7744df5 c7853cf8ffff5945a7c1 c78540f8ffffa498530c } // n = 7, score = 100 // c78528f8ffff8444e610 | mov dword ptr [ebp - 0x7d8], 0x10e64484 // c7852cf8ffff585d2200 | mov dword ptr [ebp - 0x7d4], 0x225d58 // c78530f8ffffd1516a05 | mov dword ptr [ebp - 0x7d0], 0x56a51d1 // c78534f8ffff6eb8bfa6 | mov dword ptr [ebp - 0x7cc], 0xa6bfb86e // c78538f8ffffe7744df5 | mov dword ptr [ebp - 0x7c8], 0xf54d74e7 // c7853cf8ffff5945a7c1 | mov dword ptr [ebp - 0x7c4], 0xc1a74559 // c78540f8ffffa498530c | mov dword ptr [ebp - 0x7c0], 0xc5398a4 $sequence_4 = { 8bf8 c1cf02 89bdc8feffff 8bf8 c1cf0d 89bdd4feffff 03ce } // n = 7, score = 100 // 8bf8 | mov edi, eax // c1cf02 | ror edi, 2 // 89bdc8feffff | mov dword ptr [ebp - 0x138], edi // 8bf8 | mov edi, eax // c1cf0d | ror edi, 0xd // 89bdd4feffff | mov dword ptr [ebp - 0x12c], edi // 03ce | add ecx, esi $sequence_5 = { 0fb611 0fb64902 c1e208 0bc2 c1e008 0bc1 3d1e480000 } // n = 7, score = 100 // 0fb611 | movzx edx, byte ptr [ecx] // 0fb64902 | movzx ecx, byte ptr [ecx + 2] // c1e208 | shl edx, 8 // 0bc2 | or eax, edx // c1e008 | shl eax, 8 // 0bc1 | or eax, ecx // 3d1e480000 | cmp eax, 0x481e $sequence_6 = { e8???????? 8bd8 85db 7419 8d75f0 e8???????? 8d75e0 } // n = 7, score = 100 // e8???????? | // 8bd8 | mov ebx, eax // 85db | test ebx, ebx // 7419 | je 0x1b // 8d75f0 | lea esi, [ebp - 0x10] // e8???????? | // 8d75e0 | lea esi, [ebp - 0x20] $sequence_7 = { c78574faffff25da3f2e c78578fafffffafe28be c7857cfaffffaff05b42 c78580faffff0973699c c78584faffffb195ef80 c78588faffffdccc6129 c7858cfaffff2b44064a } // n = 7, score = 100 // c78574faffff25da3f2e | mov dword ptr [ebp - 0x58c], 0x2e3fda25 // c78578fafffffafe28be | mov dword ptr [ebp - 0x588], 0xbe28fefa // c7857cfaffffaff05b42 | mov dword ptr [ebp - 0x584], 0x425bf0af // c78580faffff0973699c | mov dword ptr [ebp - 0x580], 0x9c697309 // c78584faffffb195ef80 | mov dword ptr [ebp - 0x57c], 0x80ef95b1 // c78588faffffdccc6129 | mov dword ptr [ebp - 0x578], 0x2961ccdc // c7858cfaffff2b44064a | mov dword ptr [ebp - 0x574], 0x4a06442b $sequence_8 = { 0fb6d9 0fb61c9d18164300 c1e908 81e2000000ff 250000ff00 33c2 0fb6c9 } // n = 7, score = 100 // 0fb6d9 | movzx ebx, cl // 0fb61c9d18164300 | movzx ebx, byte ptr [ebx*4 + 0x431618] // c1e908 | shr ecx, 8 // 81e2000000ff | and edx, 0xff000000 // 250000ff00 | and eax, 0xff0000 // 33c2 | xor eax, edx // 0fb6c9 | movzx ecx, cl $sequence_9 = { e8???????? 83c408 85c0 0f888c000000 8b550c 52 56 } // n = 7, score = 100 // e8???????? | // 83c408 | add esp, 8 // 85c0 | test eax, eax // 0f888c000000 | js 0x92 // 8b550c | mov edx, dword ptr [ebp + 0xc] // 52 | push edx // 56 | push esi condition: 7 of them and filesize < 516096 }
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