Actor(s): APT37
There is no description at this point.
rule win_poohmilk_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-04-08" version = "1" description = "Detects win.poohmilk." 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.poohmilk" 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 = { 0bfa 0fb7ff 89bd34ffffff 3d00040000 0f83e0000000 ba01000000 } // n = 6, score = 200 // 0bfa | or edi, edx // 0fb7ff | movzx edi, di // 89bd34ffffff | mov dword ptr [ebp - 0xcc], edi // 3d00040000 | cmp eax, 0x400 // 0f83e0000000 | jae 0xe6 // ba01000000 | mov edx, 1 $sequence_1 = { 6a00 6a01 6800000080 8d85ecfdffff 50 ff15???????? } // n = 6, score = 200 // 6a00 | push 0 // 6a01 | push 1 // 6800000080 | push 0x80000000 // 8d85ecfdffff | lea eax, dword ptr [ebp - 0x214] // 50 | push eax // ff15???????? | $sequence_2 = { b805050505 c7412c20010000 c7413020000000 8981e00d0000 8981e40d0000 8981e80d0000 } // n = 6, score = 200 // b805050505 | mov eax, 0x5050505 // c7412c20010000 | mov dword ptr [ecx + 0x2c], 0x120 // c7413020000000 | mov dword ptr [ecx + 0x30], 0x20 // 8981e00d0000 | mov dword ptr [ecx + 0xde0], eax // 8981e40d0000 | mov dword ptr [ecx + 0xde4], eax // 8981e80d0000 | mov dword ptr [ecx + 0xde8], eax $sequence_3 = { 83fa02 0f8d99000000 8b8d74ffffff 8bc3 25ff030000 0fbf8441000f0000 85c0 } // n = 7, score = 200 // 83fa02 | cmp edx, 2 // 0f8d99000000 | jge 0x9f // 8b8d74ffffff | mov ecx, dword ptr [ebp - 0x8c] // 8bc3 | mov eax, ebx // 25ff030000 | and eax, 0x3ff // 0fbf8441000f0000 | movsx eax, word ptr [ecx + eax*2 + 0xf00] // 85c0 | test eax, eax $sequence_4 = { ff15???????? 8b8d60f3ffff 68???????? 51 8bf0 } // n = 5, score = 200 // ff15???????? | // 8b8d60f3ffff | mov ecx, dword ptr [ebp - 0xca0] // 68???????? | // 51 | push ecx // 8bf0 | mov esi, eax $sequence_5 = { 899d2cffffff 89bd38ffffff c78568ffffffffffffff 89bd60ffffff 899558ffffff 7405 83c9ff } // n = 7, score = 200 // 899d2cffffff | mov dword ptr [ebp - 0xd4], ebx // 89bd38ffffff | mov dword ptr [ebp - 0xc8], edi // c78568ffffffffffffff | mov dword ptr [ebp - 0x98], 0xffffffff // 89bd60ffffff | mov dword ptr [ebp - 0xa0], edi // 899558ffffff | mov dword ptr [ebp - 0xa8], edx // 7405 | je 7 // 83c9ff | or ecx, 0xffffffff $sequence_6 = { 03c8 0fb64605 03d9 03c8 0fb64606 } // n = 5, score = 200 // 03c8 | add ecx, eax // 0fb64605 | movzx eax, byte ptr [esi + 5] // 03d9 | add ebx, ecx // 03c8 | add ecx, eax // 0fb64606 | movzx eax, byte ptr [esi + 6] $sequence_7 = { c70234000000 e9???????? 8b8574ffffff c78568ffffff02000000 c70009000000 e9???????? } // n = 6, score = 200 // c70234000000 | mov dword ptr [edx], 0x34 // e9???????? | // 8b8574ffffff | mov eax, dword ptr [ebp - 0x8c] // c78568ffffff02000000 | mov dword ptr [ebp - 0x98], 2 // c70009000000 | mov dword ptr [eax], 9 // e9???????? | $sequence_8 = { 8b4de4 83c40c 6bc930 8975e0 8db1107c4100 8975e4 eb2b } // n = 7, score = 200 // 8b4de4 | mov ecx, dword ptr [ebp - 0x1c] // 83c40c | add esp, 0xc // 6bc930 | imul ecx, ecx, 0x30 // 8975e0 | mov dword ptr [ebp - 0x20], esi // 8db1107c4100 | lea esi, dword ptr [ecx + 0x417c10] // 8975e4 | mov dword ptr [ebp - 0x1c], esi // eb2b | jmp 0x2d $sequence_9 = { 0f8d99000000 8b8d74ffffff 8bc3 25ff030000 0fbf8441000f0000 85c0 7811 } // n = 7, score = 200 // 0f8d99000000 | jge 0x9f // 8b8d74ffffff | mov ecx, dword ptr [ebp - 0x8c] // 8bc3 | mov eax, ebx // 25ff030000 | and eax, 0x3ff // 0fbf8441000f0000 | movsx eax, word ptr [ecx + eax*2 + 0xf00] // 85c0 | test eax, eax // 7811 | js 0x13 condition: 7 of them and filesize < 245760 }
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