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 = "2023-07-11" 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 = "20230705" malpedia_hash = "42d0574f4405bd7d2b154d321d345acb18834a41" malpedia_version = "20230715" 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 = { 7445 48 75e2 6a02 56 e8???????? } // n = 6, score = 200 // 7445 | je 0x47 // 48 | dec eax // 75e2 | jne 0xffffffe4 // 6a02 | push 2 // 56 | push esi // e8???????? | $sequence_1 = { 8d5e18 397d10 7e6d 8a03 8365fc00 8845f7 8b4d10 } // n = 7, score = 200 // 8d5e18 | lea ebx, [esi + 0x18] // 397d10 | cmp dword ptr [ebp + 0x10], edi // 7e6d | jle 0x6f // 8a03 | mov al, byte ptr [ebx] // 8365fc00 | and dword ptr [ebp - 4], 0 // 8845f7 | mov byte ptr [ebp - 9], al // 8b4d10 | mov ecx, dword ptr [ebp + 0x10] $sequence_2 = { 0f85fbfeffff 8d8558ffffff 50 e8???????? 397de4 7420 } // n = 6, score = 200 // 0f85fbfeffff | jne 0xffffff01 // 8d8558ffffff | lea eax, [ebp - 0xa8] // 50 | push eax // e8???????? | // 397de4 | cmp dword ptr [ebp - 0x1c], edi // 7420 | je 0x22 $sequence_3 = { ff37 ffd3 832700 8b86401b0000 } // n = 4, score = 200 // ff37 | push dword ptr [edi] // ffd3 | call ebx // 832700 | and dword ptr [edi], 0 // 8b86401b0000 | mov eax, dword ptr [esi + 0x1b40] $sequence_4 = { 83e800 0f8461010000 48 0f84bd000000 48 746a 48 } // n = 7, score = 200 // 83e800 | sub eax, 0 // 0f8461010000 | je 0x167 // 48 | dec eax // 0f84bd000000 | je 0xc3 // 48 | dec eax // 746a | je 0x6c // 48 | dec eax $sequence_5 = { 7403 50 ffd3 8bb6101b0000 85f6 7403 56 } // n = 7, score = 200 // 7403 | je 5 // 50 | push eax // ffd3 | call ebx // 8bb6101b0000 | mov esi, dword ptr [esi + 0x1b10] // 85f6 | test esi, esi // 7403 | je 5 // 56 | push esi $sequence_6 = { 3945dc 760e 8b4ddc 2bc8 51 6a00 56 } // n = 7, score = 200 // 3945dc | cmp dword ptr [ebp - 0x24], eax // 760e | jbe 0x10 // 8b4ddc | mov ecx, dword ptr [ebp - 0x24] // 2bc8 | sub ecx, eax // 51 | push ecx // 6a00 | push 0 // 56 | push esi $sequence_7 = { a3???????? 5e 5b c9 c20400 } // n = 5, score = 200 // a3???????? | // 5e | pop esi // 5b | pop ebx // c9 | leave // c20400 | ret 4 $sequence_8 = { 6af6 ff15???????? a1???????? 3bc3 750b 3bf3 7515 } // n = 7, score = 200 // 6af6 | push -0xa // ff15???????? | // a1???????? | // 3bc3 | cmp eax, ebx // 750b | jne 0xd // 3bf3 | cmp esi, ebx // 7515 | jne 0x17 $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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