SYMBOLCOMMON_NAMEaka. SYNONYMS
win.moonwind (Back to overview)

MoonWind


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References
2017-03-30Palo Alto Networks Unit 42Jen Miller-Osborn, Josh Grunzweig
@online{millerosborn:20170330:trochilus:bface4b, author = {Jen Miller-Osborn and Josh Grunzweig}, title = {{Trochilus and New MoonWind RATs Used In Attack Against Thai Organizations}}, date = {2017-03-30}, organization = {Palo Alto Networks Unit 42}, url = {http://researchcenter.paloaltonetworks.com/2017/03/unit42-trochilus-rat-new-moonwind-rat-used-attack-thai-utility-organizations/}, language = {English}, urldate = {2019-12-20} } Trochilus and New MoonWind RATs Used In Attack Against Thai Organizations
MoonWind
Yara Rules
[TLP:WHITE] win_moonwind_auto (20201014 | autogenerated rule brought to you by yara-signator)
rule win_moonwind_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2020-10-14"
        version = "1"
        description = "autogenerated rule brought to you by yara-signator"
        tool = "yara-signator v0.5.0"
        tool_config = "callsandjumps;datarefs;binvalue"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.moonwind"
        malpedia_rule_date = "20201014"
        malpedia_hash = "a7e3bd57eaf12bf3ea29a863c041091ba3af9ac9"
        malpedia_version = "20201014"
        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 = { 83bc24e401000004 770d 68???????? 8d4d08 e8???????? 8b8424e4010000 bf09000000 }
            // n = 7, score = 100
            //   83bc24e401000004     | cmp                 dword ptr [esp + 0x1e4], 4
            //   770d                 | ja                  0xf
            //   68????????           |                     
            //   8d4d08               | lea                 ecx, [ebp + 8]
            //   e8????????           |                     
            //   8b8424e4010000       | mov                 eax, dword ptr [esp + 0x1e4]
            //   bf09000000           | mov                 edi, 9

        $sequence_1 = { dd5db4 dd45b4 dc05???????? dd5dac 8b5de0 83c308 895da8 }
            // n = 7, score = 100
            //   dd5db4               | fstp                qword ptr [ebp - 0x4c]
            //   dd45b4               | fld                 qword ptr [ebp - 0x4c]
            //   dc05????????         |                     
            //   dd5dac               | fstp                qword ptr [ebp - 0x54]
            //   8b5de0               | mov                 ebx, dword ptr [ebp - 0x20]
            //   83c308               | add                 ebx, 8
            //   895da8               | mov                 dword ptr [ebp - 0x58], ebx

        $sequence_2 = { e8???????? 83c404 8bc7 5f 5e c3 8b5630 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   8bc7                 | mov                 eax, edi
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi
            //   c3                   | ret                 
            //   8b5630               | mov                 edx, dword ptr [esi + 0x30]

        $sequence_3 = { 8b442424 85c0 7409 50 e8???????? 83c404 8b7f34 }
            // n = 7, score = 100
            //   8b442424             | mov                 eax, dword ptr [esp + 0x24]
            //   85c0                 | test                eax, eax
            //   7409                 | je                  0xb
            //   50                   | push                eax
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   8b7f34               | mov                 edi, dword ptr [edi + 0x34]

        $sequence_4 = { e8???????? 83c404 8945f4 8b45f4 3945f8 0f84a6040000 8965ec }
            // n = 7, score = 100
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   8945f4               | mov                 dword ptr [ebp - 0xc], eax
            //   8b45f4               | mov                 eax, dword ptr [ebp - 0xc]
            //   3945f8               | cmp                 dword ptr [ebp - 8], eax
            //   0f84a6040000         | je                  0x4ac
            //   8965ec               | mov                 dword ptr [ebp - 0x14], esp

        $sequence_5 = { 83f800 0f85a0000000 c745e800000000 6a00 8d45e8 50 c745e400000000 }
            // n = 7, score = 100
            //   83f800               | cmp                 eax, 0
            //   0f85a0000000         | jne                 0xa6
            //   c745e800000000       | mov                 dword ptr [ebp - 0x18], 0
            //   6a00                 | push                0
            //   8d45e8               | lea                 eax, [ebp - 0x18]
            //   50                   | push                eax
            //   c745e400000000       | mov                 dword ptr [ebp - 0x1c], 0

        $sequence_6 = { 83c404 58 8945ec 8b5df4 53 8b0b 83c304 }
            // n = 7, score = 100
            //   83c404               | add                 esp, 4
            //   58                   | pop                 eax
            //   8945ec               | mov                 dword ptr [ebp - 0x14], eax
            //   8b5df4               | mov                 ebx, dword ptr [ebp - 0xc]
            //   53                   | push                ebx
            //   8b0b                 | mov                 ecx, dword ptr [ebx]
            //   83c304               | add                 ebx, 4

        $sequence_7 = { ff05???????? 8be5 5d c3 55 8bec 81ec68000000 }
            // n = 7, score = 100
            //   ff05????????         |                     
            //   8be5                 | mov                 esp, ebp
            //   5d                   | pop                 ebp
            //   c3                   | ret                 
            //   55                   | push                ebp
            //   8bec                 | mov                 ebp, esp
            //   81ec68000000         | sub                 esp, 0x68

        $sequence_8 = { 83c404 58 8945f4 8b5dfc 83c308 895de0 6a00 }
            // n = 7, score = 100
            //   83c404               | add                 esp, 4
            //   58                   | pop                 eax
            //   8945f4               | mov                 dword ptr [ebp - 0xc], eax
            //   8b5dfc               | mov                 ebx, dword ptr [ebp - 4]
            //   83c308               | add                 ebx, 8
            //   895de0               | mov                 dword ptr [ebp - 0x20], ebx
            //   6a00                 | push                0

        $sequence_9 = { 8bfa 83c9ff 33c0 81c3a4000000 f2ae f7d1 2bf9 }
            // n = 7, score = 100
            //   8bfa                 | mov                 edi, edx
            //   83c9ff               | or                  ecx, 0xffffffff
            //   33c0                 | xor                 eax, eax
            //   81c3a4000000         | add                 ebx, 0xa4
            //   f2ae                 | repne scasb         al, byte ptr es:[edi]
            //   f7d1                 | not                 ecx
            //   2bf9                 | sub                 edi, ecx

    condition:
        7 of them and filesize < 1417216
}
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