SYMBOLCOMMON_NAMEaka. SYNONYMS
win.ksl0t (Back to overview)

KSL0T

Actor(s): Turla Group


A keylogger used by Turla.

References
2019-07-080ffset Blog0verfl0w_
@online{0verfl0w:20190708:analyzing:f246b28, author = {0verfl0w_}, title = {{Analyzing KSL0T (Turla’s Keylogger), Part 1 – Reupload}}, date = {2019-07-08}, organization = {0ffset Blog}, url = {https://0ffset.net/reverse-engineering/malware-analysis/analyzing-turlas-keylogger-1/}, language = {English}, urldate = {2020-01-06} } Analyzing KSL0T (Turla’s Keylogger), Part 1 – Reupload
KSL0T
2019-07-080ffset Blog0verfl0w_
@online{0verfl0w:20190708:analyzing:b984acf, author = {0verfl0w_}, title = {{Analyzing KSL0T (Turla’s Keylogger), Part 2 – Reupload}}, date = {2019-07-08}, organization = {0ffset Blog}, url = {https://0ffset.net/reverse-engineering/malware-analysis/analyzing-turlas-keylogger-2/}, language = {English}, urldate = {2020-01-10} } Analyzing KSL0T (Turla’s Keylogger), Part 2 – Reupload
KSL0T
2018-10-05_
@online{:20181005:post:4890d7d, author = {_}, title = {{Post 0x17.2: Analyzing Turla’s Keylogger}}, date = {2018-10-05}, url = {https://0ffset.wordpress.com/2018/10/05/post-0x17-2-turla-keylogger/}, language = {English}, urldate = {2019-07-27} } Post 0x17.2: Analyzing Turla’s Keylogger
KSL0T
Yara Rules
[TLP:WHITE] win_ksl0t_auto (20201023 | autogenerated rule brought to you by yara-signator)
rule win_ksl0t_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2020-12-22"
        version = "1"
        description = "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.ksl0t"
        malpedia_rule_date = "20201222"
        malpedia_hash = "30354d830a29f0fbd3714d93d94dea941d77a130"
        malpedia_version = "20201023"
        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 = { e9???????? 488b05???????? 4839442460 0f8428040000 488b442460 488905???????? 488d8c2480080000 }
            // n = 7, score = 200
            //   e9????????           |                     
            //   488b05????????       |                     
            //   4839442460           | mov                 byte ptr [esp + 0xa6], 0x38
            //   0f8428040000         | dec                 eax
            //   488b442460           | cmp                 dword ptr [esp + 0x60], eax
            //   488905????????       |                     
            //   488d8c2480080000     | je                  0x42e

        $sequence_1 = { c68424a10000003c c68424a200000039 c68424a300000030 c68424a400000001 c68424a50000003c c68424a600000038 }
            // n = 6, score = 200
            //   c68424a10000003c     | lea                 edx, [0xc67d]
            //   c68424a200000039     | mov                 byte ptr [esp + 0xa1], 0x3c
            //   c68424a300000030     | mov                 byte ptr [esp + 0xa2], 0x39
            //   c68424a400000001     | mov                 byte ptr [esp + 0xa3], 0x30
            //   c68424a50000003c     | mov                 byte ptr [esp + 0xa4], 1
            //   c68424a600000038     | mov                 byte ptr [esp + 0xa5], 0x3c

        $sequence_2 = { 8d44241c 50 55 ffd7 8d4c242c 8bd8 }
            // n = 6, score = 200
            //   8d44241c             | nop                 
            //   50                   | push                0x1c
            //   55                   | push                edi
            //   ffd7                 | add                 esp, 0xc
            //   8d4c242c             | mov                 esi, 0x1c
            //   8bd8                 | mov                 dword ptr [ebp - 0x1c], esi

        $sequence_3 = { ff15???????? 85c0 0f853c010000 8b8424f4080000 488b4c2448 }
            // n = 5, score = 200
            //   ff15????????         |                     
            //   85c0                 | mov                 byte ptr [esp + 0x6b], 6
            //   0f853c010000         | movzx               eax, byte ptr [ecx + eax + 0x387c]
            //   8b8424f4080000       | mov                 eax, dword ptr [ecx + eax*4 + 0x37a0]
            //   488b4c2448           | dec                 eax

        $sequence_4 = { 0fb684017c380000 8b8481a0370000 4803c1 ffe0 }
            // n = 4, score = 200
            //   0fb684017c380000     | lea                 ecx, [esp + 0x8b0]
            //   8b8481a0370000       | dec                 esp
            //   4803c1               | mov                 eax, eax
            //   ffe0                 | mov                 byte ptr [esp + 0x23f], 2

        $sequence_5 = { 88842499000000 88842482000000 c68424c900000031 c68424ca00000039 }
            // n = 4, score = 200
            //   88842499000000       | mov                 ecx, dword ptr [esp + 0x48]
            //   88842482000000       | jne                 0xb
            //   c68424c900000031     | dec                 eax
            //   c68424ca00000039     | lea                 ecx, [0x45e2]

        $sequence_6 = { 6a1c 68???????? 57 ff15???????? 83c40c be1c000000 8975e4 }
            // n = 7, score = 200
            //   6a1c                 | call                edi
            //   68????????           |                     
            //   57                   | lea                 ecx, [esp + 0x110]
            //   ff15????????         |                     
            //   83c40c               | push                ecx
            //   be1c000000           | push                ebx
            //   8975e4               | mov                 ecx, 0x3f

        $sequence_7 = { c684243f02000002 c684244002000055 c644246812 c644246930 c644246a21 c644246b06 }
            // n = 6, score = 200
            //   c684243f02000002     | mov                 eax, dword ptr [esp + 0x14b4]
            //   c684244002000055     | dec                 eax
            //   c644246812           | lea                 edx, [0xcaff]
            //   c644246930           | dec                 eax
            //   c644246a21           | lea                 ecx, [esp + 0x8b0]
            //   c644246b06           | dec                 eax

        $sequence_8 = { 448b8424b4140000 488d15ffca0000 488d8c24b0080000 ff15???????? 488d8c24b0080000 ff15???????? 4c8bc0 }
            // n = 7, score = 200
            //   448b8424b4140000     | dec                 eax
            //   488d15ffca0000       | mov                 eax, dword ptr [esp + 0x60]
            //   488d8c24b0080000     | dec                 eax
            //   ff15????????         |                     
            //   488d8c24b0080000     | lea                 ecx, [esp + 0x880]
            //   ff15????????         |                     
            //   4c8bc0               | inc                 esp

        $sequence_9 = { 8d8c2410010000 51 53 894674 ffd7 894678 8d942428030000 }
            // n = 7, score = 200
            //   8d8c2410010000       | xor                 eax, eax
            //   51                   | mov                 ecx, 0x3fe
            //   53                   | rep stosb           byte ptr es:[edi], al
            //   894674               | test                eax, eax
            //   ffd7                 | jne                 0x144
            //   894678               | mov                 eax, dword ptr [esp + 0x8f4]
            //   8d942428030000       | dec                 eax

        $sequence_10 = { b93f000000 bf???????? bb???????? bd???????? b8???????? }
            // n = 5, score = 200
            //   b93f000000           | lea                 edx, [esp + 0x328]
            //   bf????????           |                     
            //   bb????????           |                     
            //   bd????????           |                     
            //   b8????????           |                     

        $sequence_11 = { ff15???????? 3bc7 7534 ff15???????? }
            // n = 4, score = 200
            //   ff15????????         |                     
            //   3bc7                 | mov                 byte ptr [esp + 0x99], al
            //   7534                 | mov                 byte ptr [esp + 0x82], al
            //   ff15????????         |                     

        $sequence_12 = { ff15???????? c705????????01000000 eb28 488d157dc60000 }
            // n = 4, score = 200
            //   ff15????????         |                     
            //   c705????????01000000     |     
            //   eb28                 | jmp                 0x2a
            //   488d157dc60000       | dec                 eax

        $sequence_13 = { 72f3 33c0 90 308c0480000000 }
            // n = 4, score = 200
            //   72f3                 | jmp                 4
            //   33c0                 | xor                 ecx, ecx
            //   90                   | lea                 ecx, [esp + 0x110]
            //   308c0480000000       | push                ecx

        $sequence_14 = { 488dbc24a2100000 33c0 b9fe030000 f3aa }
            // n = 4, score = 200
            //   488dbc24a2100000     | mov                 byte ptr [esp + 0x240], 0x55
            //   33c0                 | mov                 byte ptr [esp + 0x68], 0x12
            //   b9fe030000           | mov                 byte ptr [esp + 0x69], 0x30
            //   f3aa                 | mov                 byte ptr [esp + 0x6a], 0x21

        $sequence_15 = { 88942429010000 8894242a010000 c684242b0100003e c684242c01000010 c684242d0100002d 888c242e010000 c68424cc01000006 }
            // n = 7, score = 200
            //   88942429010000       | cmp                 eax, edi
            //   8894242a010000       | jne                 0x38
            //   c684242b0100003e     | xor                 byte ptr [esp + eax + 0x17c], cl
            //   c684242c01000010     | inc                 eax
            //   c684242d0100002d     | cmp                 eax, 0x11
            //   888c242e010000       | jb                  0xfffffff8
            //   c68424cc01000006     | xor                 eax, eax

    condition:
        7 of them and filesize < 196608
}
Download all Yara Rules