rule win_strelastealer_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        version = "1"
        description = "Detects win.strelastealer."
        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.strelastealer"
        malpedia_rule_date = "20260422"
        malpedia_hash = "a182e35da64e6d71cb55f125c4d4225196523f14"
        malpedia_version = "20260504"
        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 = { 385e02 740b 8b7c2424 8bde e8???????? 56 }
            // n = 6, score = 100
            //   385e02               | mov                 dword ptr [ecx + 0x28], edx
            //   740b                 | dec                 eax
            //   8b7c2424             | lea                 ecx, [0xa387]
            //   8bde                 | dec                 eax
            //   e8????????           |                     
            //   56                   | mov                 eax, dword ptr [ebp - 0x28]

        $sequence_1 = { 4533c9 4c89a424d0050000 ba00000080 4533e4 4c89b424c8050000 }
            // n = 5, score = 100
            //   4533c9               | mov                 ecx, dword ptr [eax + ecx*8]
            //   4c89a424d0050000     | mov                 byte ptr [ecx + edx*8 + 0x38], 0
            //   ba00000080           | dec                 eax
            //   4533e4               | sub                 esp, 0x20
            //   4c89b424c8050000     | mov                 ebx, ecx

        $sequence_2 = { 01c1 b8dc8856d3 29c8 b9dd8856d3 }
            // n = 4, score = 100
            //   01c1                 | cmp                 byte ptr [esi + 2], bl
            //   b8dc8856d3           | je                  0x10
            //   29c8                 | mov                 edi, dword ptr [esp + 0x24]
            //   b9dd8856d3           | mov                 ebx, esi

        $sequence_3 = { 01c7 897d14 8d1401 81c200040000 }
            // n = 4, score = 100
            //   01c7                 | lea                 ecx, [esp + 0x5c]
            //   897d14               | push                ecx
            //   8d1401               | mov                 ecx, dword ptr [esp + 0x2c]
            //   81c200040000         | lea                 edx, [esp + 0x594]

        $sequence_4 = { 895128 488d0d87a30000 488b45d8 488908 488d0d892f0100 488b45d8 8990a8030000 }
            // n = 7, score = 100
            //   895128               | dec                 esp
            //   488d0d87a30000       | lea                 ecx, [0xe12d]
            //   488b45d8             | mov                 ecx, 1
            //   488908               | dec                 esp
            //   488d0d892f0100       | lea                 eax, [0xe119]
            //   488b45d8             | dec                 eax
            //   8990a8030000         | lea                 edx, [0xe11a]

        $sequence_5 = { 08c1 0f1f440000 b810000000 e8???????? }
            // n = 4, score = 100
            //   08c1                 | mov                 ecx, dword ptr [eax + 0x88]
            //   0f1f440000           | dec                 eax
            //   b810000000           | lea                 eax, [0x15405]
            //   e8????????           |                     

        $sequence_6 = { e8???????? 8b4de4 83c40c 6bc930 8975e0 8db128b90010 8975e4 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   8b4de4               | dec                 eax
            //   83c40c               | mov                 dword ptr [eax], ecx
            //   6bc930               | dec                 eax
            //   8975e0               | lea                 ecx, [0x12f89]
            //   8db128b90010         | dec                 eax
            //   8975e4               | mov                 eax, dword ptr [ebp - 0x28]

        $sequence_7 = { 488b8888000000 488d053d110100 483bc8 7405 e8???????? c70301000000 488b85a0010000 }
            // n = 7, score = 100
            //   488b8888000000       | dec                 eax
            //   488d053d110100       | mov                 ecx, dword ptr [eax + 0x88]
            //   483bc8               | dec                 eax
            //   7405                 | lea                 eax, [0x1113d]
            //   e8????????           |                     
            //   c70301000000         | dec                 eax
            //   488b85a0010000       | cmp                 ecx, eax

        $sequence_8 = { 08c1 08d3 89ca 80e201 }
            // n = 4, score = 100
            //   08c1                 | mov                 ecx, 0xd35688dd
            //   08d3                 | sub                 ecx, eax
            //   89ca                 | dec                 eax
            //   80e201               | mov                 dword ptr [ebp - 0x20], ecx

        $sequence_9 = { 68???????? ff15???????? 6a05 8bf8 e8???????? 8b15???????? }
            // n = 6, score = 100
            //   68????????           |                     
            //   ff15????????         |                     
            //   6a05                 | dec                 eax
            //   8bf8                 | mov                 dword ptr [ecx], eax
            //   e8????????           |                     
            //   8b15????????         |                     

        $sequence_10 = { 08c1 08da 80f201 89c8 }
            // n = 4, score = 100
            //   08c1                 | mov                 ecx, esi
            //   08da                 | add                 edi, eax
            //   80f201               | mov                 dword ptr [ebp + 0x14], edi
            //   89c8                 | lea                 edx, [ecx + eax]

        $sequence_11 = { 015304 eb55 4d85c0 7e27 488bd7 4c8b4dc7 4b8b8ccbc0120600 }
            // n = 7, score = 100
            //   015304               | mov                 eax, dword ptr [ebp - 4]
            //   eb55                 | push                dword ptr [eax*8 + 0x1000b2ac]
            //   4d85c0               | push                ebx
            //   7e27                 | mov                 eax, dword ptr [esp + 0x34]
            //   488bd7               | mov                 ecx, dword ptr [esp + 0x38]
            //   4c8b4dc7             | push                ebx
            //   4b8b8ccbc0120600     | push                ebx

        $sequence_12 = { 4883ec20 8bd9 4c8d0d2de10000 b901000000 4c8d0519e10000 488d151ae10000 }
            // n = 6, score = 100
            //   4883ec20             | sub                 eax, esi
            //   8bd9                 | dec                 esp
            //   4c8d0d2de10000       | lea                 eax, [0xcc2f]
            //   b901000000           | and                 edx, 0x3f
            //   4c8d0519e10000       | dec                 eax
            //   488d151ae10000       | mov                 ecx, edi

        $sequence_13 = { 56 e8???????? 83c414 8b45fc ff34c5acb20010 53 }
            // n = 6, score = 100
            //   56                   | inc                 ebp
            //   e8????????           |                     
            //   83c414               | xor                 ecx, ecx
            //   8b45fc               | dec                 esp
            //   ff34c5acb20010       | mov                 dword ptr [esp + 0x5d0], esp
            //   53                   | mov                 edx, 0x80000000

        $sequence_14 = { 08c1 20ca 80f101 89c8 }
            // n = 4, score = 100
            //   08c1                 | mov                 edx, ecx
            //   20ca                 | and                 dl, 1
            //   80f101               | or                  cl, al
            //   89c8                 | or                  bl, dl

        $sequence_15 = { e8???????? 8b15???????? 83c404 8bf0 52 }
            // n = 5, score = 100
            //   e8????????           |                     
            //   8b15????????         |                     
            //   83c404               | mov                 dword ptr [eax + 0x3a8], edx
            //   8bf0                 | inc                 esp
            //   52                   | mov                 ecx, dword ptr [esp + 0x78]

        $sequence_16 = { 4e0fbeac18d0a80100 418d4d01 4c8b459f 4c2bc6 }
            // n = 4, score = 100
            //   4e0fbeac18d0a80100     | je    7
            //   418d4d01             | mov                 dword ptr [ebx], 1
            //   4c8b459f             | dec                 eax
            //   4c2bc6               | mov                 eax, dword ptr [ebp + 0x1a0]

        $sequence_17 = { 4c8d052fcc0000 83e23f 488bcf 48c1f906 488d14d2 498b0cc8 c644d13800 }
            // n = 7, score = 100
            //   4c8d052fcc0000       | dec                 esi
            //   83e23f               | movsx               ebp, byte ptr [eax + ebx + 0x1a8d0]
            //   488bcf               | inc                 ecx
            //   48c1f906             | lea                 ecx, [ebp + 1]
            //   488d14d2             | dec                 esp
            //   498b0cc8             | mov                 eax, dword ptr [ebp - 0x61]
            //   c644d13800           | dec                 esp

        $sequence_18 = { 4883611000 488d056cc50000 48894108 488d0551c50000 488901 }
            // n = 5, score = 100
            //   4883611000           | dec                 eax
            //   488d056cc50000       | sar                 ecx, 6
            //   48894108             | dec                 eax
            //   488d0551c50000       | lea                 edx, [edx + edx*8]
            //   488901               | dec                 ecx

        $sequence_19 = { 53 53 53 8d4c245c 51 8b4c242c 8d942494050000 }
            // n = 7, score = 100
            //   53                   | sub                 esp, 0x20
            //   53                   | dec                 eax
            //   53                   | mov                 ebx, ecx
            //   8d4c245c             | dec                 esp
            //   51                   | lea                 ecx, [0x8324]
            //   8b4c242c             | mov                 ecx, 0x19
            //   8d942494050000       | dec                 esp

        $sequence_20 = { ff15???????? 8b442434 8b4c2438 53 53 }
            // n = 5, score = 100
            //   ff15????????         |                     
            //   8b442434             | inc                 ebp
            //   8b4c2438             | xor                 esp, esp
            //   53                   | dec                 esp
            //   53                   | mov                 dword ptr [esp + 0x5c8], esi

        $sequence_21 = { 53 6804010000 8d94247c030000 52 50 }
            // n = 5, score = 100
            //   53                   | dec                 eax
            //   6804010000           | lea                 eax, [ebp + 0x1c0]
            //   8d94247c030000       | dec                 esp
            //   52                   | mov                 eax, dword ptr [ebp - 0x80]
            //   50                   | dec                 eax

        $sequence_22 = { 03c7 751f 488b85a0010000 488b8888000000 488d0505540100 }
            // n = 5, score = 100
            //   03c7                 | mov                 eax, 0xd35688dc
            //   751f                 | sub                 eax, ecx
            //   488b85a0010000       | mov                 ecx, 0xd35688dd
            //   488b8888000000       | add                 ecx, eax
            //   488d0505540100       | mov                 eax, 0xd35688dc

        $sequence_23 = { ff15???????? 448b4c2478 488d85c0010000 4c8b4580 }
            // n = 4, score = 100
            //   ff15????????         |                     
            //   448b4c2478           | dec                 eax
            //   488d85c0010000       | and                 dword ptr [ecx + 0x10], 0
            //   4c8b4580             | dec                 eax

    condition:
        7 of them and filesize < 872448
}

rule win_strelastealer_w0 {
    meta:
	    description = "detect_StrelaStealer"
	    author = "@malgamy12"
	    date = "2022/11/12"
	    license = "DRL 1.1"
        hash = "6e8a3ffffd2f7a91f3f845b78dd90011feb80d30b4fe48cb174b629afa273403"
        
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.strelastealer"
        malpedia_rule_date = "20230118"
        malpedia_hash = ""
        malpedia_version = "20230118"
        malpedia_license = "DRL 1.1"
        malpedia_sharing = "TLP:WHITE"

    strings:
        $pdb = "StrelaDLLCompile.pdb" ascii

        $s1 = "4f3855aa-af7e-4fd2-b04e-55e63653d2f7" ascii
        $s2 = "StrelaDLLCompile.dll" ascii

        $chunk_1 = {33 D2 8B C7 F7 F3 8D 04 2E 83 C7 ?? 83 C6 ?? 8A 92 [4] 30 56 ?? 33 D2 F7 F3 8A 82 [4] 30 46 ?? 83 FF ??} 

        
    condition:
        uint16(0) == 0x5A4D  and ($pdb  or  (1 of ($s*) and $chunk_1 ))

}