SYMBOLCOMMON_NAMEaka. SYNONYMS
win.vermilion_strike (Back to overview)

Vermilion Strike


There is no description at this point.

References
2021-09-13IntezerAvigayil Mechtinger, Ryan Robinson, Joakim Kennedy
@online{mechtinger:20210913:vermilion:ff1ee5f, author = {Avigayil Mechtinger and Ryan Robinson and Joakim Kennedy}, title = {{Vermilion Strike: Linux and Windows Re-implementation of Cobalt Strike}}, date = {2021-09-13}, organization = {Intezer}, url = {https://www.intezer.com/blog/malware-analysis/vermilionstrike-reimplementation-cobaltstrike/}, language = {English}, urldate = {2021-09-14} } Vermilion Strike: Linux and Windows Re-implementation of Cobalt Strike
Vermilion Strike Vermilion Strike
Yara Rules
[TLP:WHITE] win_vermilion_strike_auto (20220808 | Detects win.vermilion_strike.)
rule win_vermilion_strike_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-08-05"
        version = "1"
        description = "Detects win.vermilion_strike."
        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.vermilion_strike"
        malpedia_rule_date = "20220805"
        malpedia_hash = "6ec06c64bcfdbeda64eff021c766b4ce34542b71"
        malpedia_version = "20220808"
        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 = { e8???????? eb11 68???????? 8d842490000000 e8???????? 8bcf 8d742434 }
            // n = 7, score = 200
            //   e8????????           |                     
            //   eb11                 | jmp                 0x13
            //   68????????           |                     
            //   8d842490000000       | lea                 eax, [esp + 0x90]
            //   e8????????           |                     
            //   8bcf                 | mov                 ecx, edi
            //   8d742434             | lea                 esi, [esp + 0x34]

        $sequence_1 = { 6aff 53 8d9424ac000000 52 8d4c2478 e8???????? }
            // n = 6, score = 200
            //   6aff                 | push                -1
            //   53                   | push                ebx
            //   8d9424ac000000       | lea                 edx, [esp + 0xac]
            //   52                   | push                edx
            //   8d4c2478             | lea                 ecx, [esp + 0x78]
            //   e8????????           |                     

        $sequence_2 = { 6a01 8bc6 8d7c2444 e8???????? 807d0100 7e01 }
            // n = 6, score = 200
            //   6a01                 | push                1
            //   8bc6                 | mov                 eax, esi
            //   8d7c2444             | lea                 edi, [esp + 0x44]
            //   e8????????           |                     
            //   807d0100             | cmp                 byte ptr [ebp + 1], 0
            //   7e01                 | jle                 3

        $sequence_3 = { 8b74242c 2bf7 c1fe02 8b44242c 8b4c2428 8b542424 50 }
            // n = 7, score = 200
            //   8b74242c             | mov                 esi, dword ptr [esp + 0x2c]
            //   2bf7                 | sub                 esi, edi
            //   c1fe02               | sar                 esi, 2
            //   8b44242c             | mov                 eax, dword ptr [esp + 0x2c]
            //   8b4c2428             | mov                 ecx, dword ptr [esp + 0x28]
            //   8b542424             | mov                 edx, dword ptr [esp + 0x24]
            //   50                   | push                eax

        $sequence_4 = { 83c404 89ac24a0000000 899c249c000000 889c248c000000 83bc248400000010 7214 }
            // n = 6, score = 200
            //   83c404               | add                 esp, 4
            //   89ac24a0000000       | mov                 dword ptr [esp + 0xa0], ebp
            //   899c249c000000       | mov                 dword ptr [esp + 0x9c], ebx
            //   889c248c000000       | mov                 byte ptr [esp + 0x8c], bl
            //   83bc248400000010     | cmp                 dword ptr [esp + 0x84], 0x10
            //   7214                 | jb                  0x16

        $sequence_5 = { 89542430 e8???????? 33c0 898424e8000000 c78424900000000f000000 8984248c000000 8844247c }
            // n = 7, score = 200
            //   89542430             | mov                 dword ptr [esp + 0x30], edx
            //   e8????????           |                     
            //   33c0                 | xor                 eax, eax
            //   898424e8000000       | mov                 dword ptr [esp + 0xe8], eax
            //   c78424900000000f000000     | mov    dword ptr [esp + 0x90], 0xf
            //   8984248c000000       | mov                 dword ptr [esp + 0x8c], eax
            //   8844247c             | mov                 byte ptr [esp + 0x7c], al

        $sequence_6 = { 68???????? c644241806 e8???????? 68???????? c644241807 e8???????? }
            // n = 6, score = 200
            //   68????????           |                     
            //   c644241806           | mov                 byte ptr [esp + 0x18], 6
            //   e8????????           |                     
            //   68????????           |                     
            //   c644241807           | mov                 byte ptr [esp + 0x18], 7
            //   e8????????           |                     

        $sequence_7 = { 8b4004 898424b4000000 c744242000000000 83c408 0fbe4c241c 56 51 }
            // n = 7, score = 200
            //   8b4004               | mov                 eax, dword ptr [eax + 4]
            //   898424b4000000       | mov                 dword ptr [esp + 0xb4], eax
            //   c744242000000000     | mov                 dword ptr [esp + 0x20], 0
            //   83c408               | add                 esp, 8
            //   0fbe4c241c           | movsx               ecx, byte ptr [esp + 0x1c]
            //   56                   | push                esi
            //   51                   | push                ecx

        $sequence_8 = { 6a00 ff15???????? 89442408 a1???????? 8b5004 8d7804 8d4c2408 }
            // n = 7, score = 200
            //   6a00                 | push                0
            //   ff15????????         |                     
            //   89442408             | mov                 dword ptr [esp + 8], eax
            //   a1????????           |                     
            //   8b5004               | mov                 edx, dword ptr [eax + 4]
            //   8d7804               | lea                 edi, [eax + 4]
            //   8d4c2408             | lea                 ecx, [esp + 8]

        $sequence_9 = { 57 e8???????? 8903 8b5610 57 52 53 }
            // n = 7, score = 200
            //   57                   | push                edi
            //   e8????????           |                     
            //   8903                 | mov                 dword ptr [ebx], eax
            //   8b5610               | mov                 edx, dword ptr [esi + 0x10]
            //   57                   | push                edi
            //   52                   | push                edx
            //   53                   | push                ebx

    condition:
        7 of them and filesize < 540672
}
Download all Yara Rules