Actor(s): APT28
There is no description at this point.
rule win_computrace_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.computrace." 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.computrace" 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 = { 66895e1a 6a7e 56 e8???????? 8b7d10 895df8 } // n = 6, score = 200 // 66895e1a | mov word ptr [esi + 0x1a], bx // 6a7e | push 0x7e // 56 | push esi // e8???????? | // 8b7d10 | mov edi, dword ptr [ebp + 0x10] // 895df8 | mov dword ptr [ebp - 8], ebx $sequence_1 = { 50 8b1d???????? ffd3 c745e428000000 6a00 } // n = 5, score = 200 // 50 | push eax // 8b1d???????? | // ffd3 | call ebx // c745e428000000 | mov dword ptr [ebp - 0x1c], 0x28 // 6a00 | push 0 $sequence_2 = { 85c0 755b a1???????? 56 897028 e8???????? } // n = 6, score = 200 // 85c0 | test eax, eax // 755b | jne 0x5d // a1???????? | // 56 | push esi // 897028 | mov dword ptr [eax + 0x28], esi // e8???????? | $sequence_3 = { 56 6888130000 6a02 5b 53 892d???????? e8???????? } // n = 7, score = 200 // 56 | push esi // 6888130000 | push 0x1388 // 6a02 | push 2 // 5b | pop ebx // 53 | push ebx // 892d???????? | // e8???????? | $sequence_4 = { 7442 6af6 ffd3 3945e0 7539 c745d801000000 808ebc1b000004 } // n = 7, score = 200 // 7442 | je 0x44 // 6af6 | push -0xa // ffd3 | call ebx // 3945e0 | cmp dword ptr [ebp - 0x20], eax // 7539 | jne 0x3b // c745d801000000 | mov dword ptr [ebp - 0x28], 1 // 808ebc1b000004 | or byte ptr [esi + 0x1bbc], 4 $sequence_5 = { a1???????? 8b483c 03c8 8bd1 2bd0 83c216 33c0 } // n = 7, score = 200 // a1???????? | // 8b483c | mov ecx, dword ptr [eax + 0x3c] // 03c8 | add ecx, eax // 8bd1 | mov edx, ecx // 2bd0 | sub edx, eax // 83c216 | add edx, 0x16 // 33c0 | xor eax, eax $sequence_6 = { 57 e8???????? 8b4608 85c0 7424 83783000 741e } // n = 7, score = 200 // 57 | push edi // e8???????? | // 8b4608 | mov eax, dword ptr [esi + 8] // 85c0 | test eax, eax // 7424 | je 0x26 // 83783000 | cmp dword ptr [eax + 0x30], 0 // 741e | je 0x20 $sequence_7 = { 6a1e e8???????? 8020db a1???????? 83c022 a3???????? } // n = 6, score = 200 // 6a1e | push 0x1e // e8???????? | // 8020db | and byte ptr [eax], 0xdb // a1???????? | // 83c022 | add eax, 0x22 // a3???????? | $sequence_8 = { ff15???????? 68???????? 8bf8 e8???????? 8d4df8 51 } // n = 6, score = 200 // ff15???????? | // 68???????? | // 8bf8 | mov edi, eax // e8???????? | // 8d4df8 | lea ecx, [ebp - 8] // 51 | push ecx $sequence_9 = { 8b750c 8b7d10 8b1f 837d0c00 750b 8b35???????? bb05000000 } // n = 7, score = 200 // 8b750c | mov esi, dword ptr [ebp + 0xc] // 8b7d10 | mov edi, dword ptr [ebp + 0x10] // 8b1f | mov ebx, dword ptr [edi] // 837d0c00 | cmp dword ptr [ebp + 0xc], 0 // 750b | jne 0xd // 8b35???????? | // bb05000000 | mov ebx, 5 condition: 7 of them and filesize < 73728 }
rule win_computrace_w0 { meta: author = "ASERT" description = "Absolute Computrace Agent Executable" reference = "https://asert.arbornetworks.com/lojack-becomes-a-double-agent/#Yara" malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.computrace" malpedia_version = "20180503" malpedia_sharing = "TLP:WHITE" malpedia_license = "" strings: $a = { D1 E0 F5 8B 4D 0C 83 D1 00 8B EC FF 33 83 C3 04 } $b1 = { 72 70 63 6E 65 74 70 2E 65 78 65 00 72 70 63 6E 65 74 70 00 } $b2 = { 54 61 67 49 64 00 } condition: $a or ($b1 and $b2) }
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