Actor(s): Leviathan
BADFLICK, a backdoor that is capable of modifying the file system, generating a reverse shell, and modifying its command-and-control configuration.
rule win_badflick_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-05-16" version = "1" description = "Detects win.badflick." 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.badflick" malpedia_rule_date = "20220513" malpedia_hash = "7f4b2229e6ae614d86d74917f6d5b41890e62a26" malpedia_version = "20220516" 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 = { 0f841c010000 83e804 746b 83e805 0f8566010000 } // n = 5, score = 100 // 0f841c010000 | je 0x122 // 83e804 | sub eax, 4 // 746b | je 0x6d // 83e805 | sub eax, 5 // 0f8566010000 | jne 0x16c $sequence_1 = { 50 c7459844000000 e8???????? 33c0 } // n = 4, score = 100 // 50 | push eax // c7459844000000 | mov dword ptr [ebp - 0x68], 0x44 // e8???????? | // 33c0 | xor eax, eax $sequence_2 = { e8???????? 59 59 8b4d08 894805 8b4d0c 89480d } // n = 7, score = 100 // e8???????? | // 59 | pop ecx // 59 | pop ecx // 8b4d08 | mov ecx, dword ptr [ebp + 8] // 894805 | mov dword ptr [eax + 5], ecx // 8b4d0c | mov ecx, dword ptr [ebp + 0xc] // 89480d | mov dword ptr [eax + 0xd], ecx $sequence_3 = { 0f8574ffffff ff75f4 ff15???????? ff75fc } // n = 4, score = 100 // 0f8574ffffff | jne 0xffffff7a // ff75f4 | push dword ptr [ebp - 0xc] // ff15???????? | // ff75fc | push dword ptr [ebp - 4] $sequence_4 = { 8b450c 89460d 8b4510 57 ff7514 894611 } // n = 6, score = 100 // 8b450c | mov eax, dword ptr [ebp + 0xc] // 89460d | mov dword ptr [esi + 0xd], eax // 8b4510 | mov eax, dword ptr [ebp + 0x10] // 57 | push edi // ff7514 | push dword ptr [ebp + 0x14] // 894611 | mov dword ptr [esi + 0x11], eax $sequence_5 = { 83c42c eb0b c605????????01 c645ff01 53 e8???????? 807dff00 } // n = 7, score = 100 // 83c42c | add esp, 0x2c // eb0b | jmp 0xd // c605????????01 | // c645ff01 | mov byte ptr [ebp - 1], 1 // 53 | push ebx // e8???????? | // 807dff00 | cmp byte ptr [ebp - 1], 0 $sequence_6 = { ff75f8 ff75e4 ff15???????? ebce 55 8bec 56 } // n = 7, score = 100 // ff75f8 | push dword ptr [ebp - 8] // ff75e4 | push dword ptr [ebp - 0x1c] // ff15???????? | // ebce | jmp 0xffffffd0 // 55 | push ebp // 8bec | mov ebp, esp // 56 | push esi $sequence_7 = { 8d85a8fbffff 50 7408 e8???????? } // n = 4, score = 100 // 8d85a8fbffff | lea eax, [ebp - 0x458] // 50 | push eax // 7408 | je 0xa // e8???????? | $sequence_8 = { 50 c645ff00 e8???????? 8b7d0c 83c709 57 } // n = 6, score = 100 // 50 | push eax // c645ff00 | mov byte ptr [ebp - 1], 0 // e8???????? | // 8b7d0c | mov edi, dword ptr [ebp + 0xc] // 83c709 | add edi, 9 // 57 | push edi $sequence_9 = { 8d85ccfdffff 50 8b45fc 8d8418d8fdffff 50 e8???????? } // n = 6, score = 100 // 8d85ccfdffff | lea eax, [ebp - 0x234] // 50 | push eax // 8b45fc | mov eax, dword ptr [ebp - 4] // 8d8418d8fdffff | lea eax, [eax + ebx - 0x228] // 50 | push eax // e8???????? | condition: 7 of them and filesize < 81920 }
rule win_badflick_w0 { meta: description = "Detects BADFLICK backdoor" author = "@VK_Intel" reference = "BADFLICK backdoor" date = "2018-03-26" hash = "7ba05abdf8f0323aa30c3d52e22df951eb5b67a2620014336eab7907b0a5cedf" reference = "https://www.fireeye.com/blog/threat-research/2018/03/suspected-chinese-espionage-group-targeting-maritime-and-engineering-industries.html" malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.badflick" malpedia_version = "20180407" malpedia_license = "CC BY-NC-SA 4.0" malpedia_sharing = "TLP:WHITE" strings: $s0 = "%s\\en-US\\cmd.exe.mui" fullword wide $s1 = "[Green] pid=%d tid=%d modulePath=%s|" fullword wide $s2 = "1|103.243.175.181|80|5|xxxxxxxxxxxxxxxxxxxxxxx" wide ascii $s3 = "modulePath=%[^|]" fullword wide $s4 = "%s:%d:%s:%d:%d" fullword ascii $s5 = "regsvr32 %s %s %s go \"%s\"" fullword wide $s6 = "modulePath=" fullword wide $s7 = "%d %d.%d.%d %s" fullword wide $s8 = "winMain static green" fullword wide $s9 = "o%d Core %.2f GHz" fullword wide $s10 = "6&62676=6B6G6N6c6s6" fullword ascii $op0 = { 8b 54 24 54 8b cf 2b cb 8d 04 0a 3b c7 76 02 8b } $op1 = { a1 08 77 40 00 89 45 94 8d 45 94 50 ff 35 04 77 } $op2 = { 8b 7c 24 14 8b f7 2b f5 8d 64 24 00 8a 1f 84 db } condition: uint16(0) == 0x5a4d and filesize < 108KB and 8 of ($s*) and 1 of ($op*) }
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