Actor(s): Sofacy
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rule win_computrace_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-04-08" 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 = "20220405" malpedia_hash = "ecd38294bd47d5589be5cd5490dc8bb4804afc2a" malpedia_version = "20220411" 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 = { 03c7 6a00 51 50 56 e8???????? 03f8 } // n = 7, score = 200 // 03c7 | add eax, edi // 6a00 | push 0 // 51 | push ecx // 50 | push eax // 56 | push esi // e8???????? | // 03f8 | add edi, eax $sequence_1 = { eb1a 8afb 80e777 387e18 } // n = 4, score = 200 // eb1a | jmp 0x1c // 8afb | mov bh, bl // 80e777 | and bh, 0x77 // 387e18 | cmp byte ptr [esi + 0x18], bh $sequence_2 = { 740e 837de400 7408 037de4 897dd8 eba6 8b4514 } // n = 7, score = 200 // 740e | je 0x10 // 837de400 | cmp dword ptr [ebp - 0x1c], 0 // 7408 | je 0xa // 037de4 | add edi, dword ptr [ebp - 0x1c] // 897dd8 | mov dword ptr [ebp - 0x28], edi // eba6 | jmp 0xffffffa8 // 8b4514 | mov eax, dword ptr [ebp + 0x14] $sequence_3 = { 6a02 56 e8???????? 53 8d45e0 50 ff75e0 } // n = 7, score = 200 // 6a02 | push 2 // 56 | push esi // e8???????? | // 53 | push ebx // 8d45e0 | lea eax, dword ptr [ebp - 0x20] // 50 | push eax // ff75e0 | push dword ptr [ebp - 0x20] $sequence_4 = { 833d????????00 56 751f 6a00 8d85fcfeffff 50 e8???????? } // n = 7, score = 200 // 833d????????00 | // 56 | push esi // 751f | jne 0x21 // 6a00 | push 0 // 8d85fcfeffff | lea eax, dword ptr [ebp - 0x104] // 50 | push eax // e8???????? | $sequence_5 = { 8945d8 837dd8ff 743e 837dd800 } // n = 4, score = 200 // 8945d8 | mov dword ptr [ebp - 0x28], eax // 837dd8ff | cmp dword ptr [ebp - 0x28], -1 // 743e | je 0x40 // 837dd800 | cmp dword ptr [ebp - 0x28], 0 $sequence_6 = { 381d???????? 8a00 7508 381d???????? 7424 a804 7420 } // n = 7, score = 200 // 381d???????? | // 8a00 | mov al, byte ptr [eax] // 7508 | jne 0xa // 381d???????? | // 7424 | je 0x26 // a804 | test al, 4 // 7420 | je 0x22 $sequence_7 = { 68???????? e8???????? 8365e400 6af4 ff15???????? 8bd8 8365fc00 } // n = 7, score = 200 // 68???????? | // e8???????? | // 8365e400 | and dword ptr [ebp - 0x1c], 0 // 6af4 | push -0xc // ff15???????? | // 8bd8 | mov ebx, eax // 8365fc00 | and dword ptr [ebp - 4], 0 $sequence_8 = { 894104 8b5004 85d2 7504 8901 } // n = 5, score = 200 // 894104 | mov dword ptr [ecx + 4], eax // 8b5004 | mov edx, dword ptr [eax + 4] // 85d2 | test edx, edx // 7504 | jne 6 // 8901 | mov dword ptr [ecx], eax $sequence_9 = { 56 8b742408 8d8e441b0000 8a01 a801 747d 53 } // n = 7, score = 200 // 56 | push esi // 8b742408 | mov esi, dword ptr [esp + 8] // 8d8e441b0000 | lea ecx, dword ptr [esi + 0x1b44] // 8a01 | mov al, byte ptr [ecx] // a801 | test al, 1 // 747d | je 0x7f // 53 | push ebx 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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