Actor(s): APT34
The primary function of LONGWATCH is a keylogger that outputs keystrokes to a log.txt file in the Windows temp folder.
rule win_longwatch_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" version = "1" description = "Detects win.longwatch." 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.longwatch" 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 = { 6bf630 8b0c8da00b4300 80643128fd 5f 5e } // n = 5, score = 200 // 6bf630 | imul esi, esi, 0x30 // 8b0c8da00b4300 | mov ecx, dword ptr [ecx*4 + 0x430ba0] // 80643128fd | and byte ptr [ecx + esi + 0x28], 0xfd // 5f | pop edi // 5e | pop esi $sequence_1 = { 89443284 e8???????? 8b4688 8b4004 c744308890bb4200 } // n = 5, score = 200 // 89443284 | mov dword ptr [edx + esi - 0x7c], eax // e8???????? | // 8b4688 | mov eax, dword ptr [esi - 0x78] // 8b4004 | mov eax, dword ptr [eax + 4] // c744308890bb4200 | mov dword ptr [eax + esi - 0x78], 0x42bb90 $sequence_2 = { 83c408 83f8ff 7524 0f57c0 c745d0dc324200 } // n = 5, score = 200 // 83c408 | add esp, 8 // 83f8ff | cmp eax, -1 // 7524 | jne 0x26 // 0f57c0 | xorps xmm0, xmm0 // c745d0dc324200 | mov dword ptr [ebp - 0x30], 0x4232dc $sequence_3 = { 84c0 741c 85db 7507 c74634dc6e4200 } // n = 5, score = 200 // 84c0 | test al, al // 741c | je 0x1e // 85db | test ebx, ebx // 7507 | jne 9 // c74634dc6e4200 | mov dword ptr [esi + 0x34], 0x426edc $sequence_4 = { 8b048da00b4300 894df0 8b4c3818 894dec 8b4d10 } // n = 5, score = 200 // 8b048da00b4300 | mov eax, dword ptr [ecx*4 + 0x430ba0] // 894df0 | mov dword ptr [ebp - 0x10], ecx // 8b4c3818 | mov ecx, dword ptr [eax + edi + 0x18] // 894dec | mov dword ptr [ebp - 0x14], ecx // 8b4d10 | mov ecx, dword ptr [ebp + 0x10] $sequence_5 = { 83c40c e9???????? 8b048da00b4300 8b4df0 f644012880 745b } // n = 6, score = 200 // 83c40c | add esp, 0xc // e9???????? | // 8b048da00b4300 | mov eax, dword ptr [ecx*4 + 0x430ba0] // 8b4df0 | mov ecx, dword ptr [ebp - 0x10] // f644012880 | test byte ptr [ecx + eax + 0x28], 0x80 // 745b | je 0x5d $sequence_6 = { 53 e8???????? 8b0cb5a00b4300 83c410 } // n = 4, score = 200 // 53 | push ebx // e8???????? | // 8b0cb5a00b4300 | mov ecx, dword ptr [esi*4 + 0x430ba0] // 83c410 | add esp, 0x10 $sequence_7 = { 6a00 6a00 8d8d48ffffff c78548ffffffdc334200 e8???????? 83ec08 c745fc02000000 } // n = 7, score = 200 // 6a00 | push 0 // 6a00 | push 0 // 8d8d48ffffff | lea ecx, [ebp - 0xb8] // c78548ffffffdc334200 | mov dword ptr [ebp - 0xb8], 0x4233dc // e8???????? | // 83ec08 | sub esp, 8 // c745fc02000000 | mov dword ptr [ebp - 4], 2 $sequence_8 = { 1bc0 83c801 85c0 745b e8???????? } // n = 5, score = 200 // 1bc0 | sbb eax, eax // 83c801 | or eax, 1 // 85c0 | test eax, eax // 745b | je 0x5d // e8???????? | $sequence_9 = { e8???????? 8d45a8 c645fc04 50 c745a884334200 e8???????? 8b451c } // n = 7, score = 200 // e8???????? | // 8d45a8 | lea eax, [ebp - 0x58] // c645fc04 | mov byte ptr [ebp - 4], 4 // 50 | push eax // c745a884334200 | mov dword ptr [ebp - 0x58], 0x423384 // e8???????? | // 8b451c | mov eax, dword ptr [ebp + 0x1c] condition: 7 of them and filesize < 647168 }
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