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 = "2023-12-06" 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 = "20231130" malpedia_hash = "fc8a0e9f343f6d6ded9e7df1a64dac0cc68d7351" malpedia_version = "20230808" 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 = { ff75cc e8???????? 3975e4 753a } // n = 4, score = 200 // ff75cc | push dword ptr [ebp - 0x34] // e8???????? | // 3975e4 | cmp dword ptr [ebp - 0x1c], esi // 753a | jne 0x3c $sequence_1 = { e8???????? 8a4002 8b0d???????? 8801 ff35???????? } // n = 5, score = 200 // e8???????? | // 8a4002 | mov al, byte ptr [eax + 2] // 8b0d???????? | // 8801 | mov byte ptr [ecx], al // ff35???????? | $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 = { 7503 800e08 e8???????? 894604 ff750c 8f4618 } // n = 6, score = 200 // 7503 | jne 5 // 800e08 | or byte ptr [esi], 8 // e8???????? | // 894604 | mov dword ptr [esi + 4], eax // ff750c | push dword ptr [ebp + 0xc] // 8f4618 | pop dword ptr [esi + 0x18] $sequence_4 = { e30d 83c00a 51 ff750c 50 e8???????? } // n = 6, score = 200 // e30d | jecxz 0xf // 83c00a | add eax, 0xa // 51 | push ecx // ff750c | push dword ptr [ebp + 0xc] // 50 | push eax // e8???????? | $sequence_5 = { e8???????? 837de400 0f8593feffff 8b86481b0000 83786c00 0f8483feffff } // n = 6, score = 200 // e8???????? | // 837de400 | cmp dword ptr [ebp - 0x1c], 0 // 0f8593feffff | jne 0xfffffe99 // 8b86481b0000 | mov eax, dword ptr [esi + 0x1b48] // 83786c00 | cmp dword ptr [eax + 0x6c], 0 // 0f8483feffff | je 0xfffffe89 $sequence_6 = { 8b7508 80665cfe 33c0 8945fc 8845fb 6689461a 48 } // n = 7, score = 200 // 8b7508 | mov esi, dword ptr [ebp + 8] // 80665cfe | and byte ptr [esi + 0x5c], 0xfe // 33c0 | xor eax, eax // 8945fc | mov dword ptr [ebp - 4], eax // 8845fb | mov byte ptr [ebp - 5], al // 6689461a | mov word ptr [esi + 0x1a], ax // 48 | dec eax $sequence_7 = { 7414 c745dc01000000 897d8c 6af1 } // n = 4, score = 200 // 7414 | je 0x16 // c745dc01000000 | mov dword ptr [ebp - 0x24], 1 // 897d8c | mov dword ptr [ebp - 0x74], edi // 6af1 | push -0xf $sequence_8 = { e8???????? 8945e4 3bc6 7417 } // n = 4, score = 200 // e8???????? | // 8945e4 | mov dword ptr [ebp - 0x1c], eax // 3bc6 | cmp eax, esi // 7417 | je 0x19 $sequence_9 = { ff15???????? f7d8 1bc0 40 57 } // n = 5, score = 200 // ff15???????? | // f7d8 | neg eax // 1bc0 | sbb eax, eax // 40 | inc eax // 57 | push edi 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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