SYMBOLCOMMON_NAMEaka. SYNONYMS
win.telb (Back to overview)

TelB


According to Check Point, this is a Telegram-focused infostealer (SOAP / Delphi) used to target Iranian expats and dissidents.

References
2020-09-20Check Point ResearchCheck Point Research
@online{research:20200920:rampant:778d674, author = {Check Point Research}, title = {{Rampant Kitten – An Iranian Espionage Campaign}}, date = {2020-09-20}, organization = {Check Point Research}, url = {https://research.checkpoint.com/2020/rampant-kitten-an-iranian-espionage-campaign/}, language = {English}, urldate = {2020-09-21} } Rampant Kitten – An Iranian Espionage Campaign
HookInjEx TelAndExt TelB
Yara Rules
[TLP:WHITE] win_telb_auto (20220808 | Detects win.telb.)
rule win_telb_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-08-05"
        version = "1"
        description = "Detects win.telb."
        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.telb"
        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 = { 8d8d40efffff ffb5b0efffff 0f4385a0efffff 50 e8???????? c785c8efffff00000000 }
            // n = 6, score = 200
            //   8d8d40efffff         | lea                 ecx, [ebp - 0x10c0]
            //   ffb5b0efffff         | push                dword ptr [ebp - 0x1050]
            //   0f4385a0efffff       | cmovae              eax, dword ptr [ebp - 0x1060]
            //   50                   | push                eax
            //   e8????????           |                     
            //   c785c8efffff00000000     | mov    dword ptr [ebp - 0x1038], 0

        $sequence_1 = { 2bc1 894c2410 3bd8 0f8783000000 0faee8 }
            // n = 5, score = 200
            //   2bc1                 | sub                 eax, ecx
            //   894c2410             | mov                 dword ptr [esp + 0x10], ecx
            //   3bd8                 | cmp                 ebx, eax
            //   0f8783000000         | ja                  0x89
            //   0faee8               | lfence              

        $sequence_2 = { 68???????? 8d8d40efffff e8???????? c645fc18 8d8d40efffff 8b8548eeffff 83c802 }
            // n = 7, score = 200
            //   68????????           |                     
            //   8d8d40efffff         | lea                 ecx, [ebp - 0x10c0]
            //   e8????????           |                     
            //   c645fc18             | mov                 byte ptr [ebp - 4], 0x18
            //   8d8d40efffff         | lea                 ecx, [ebp - 0x10c0]
            //   8b8548eeffff         | mov                 eax, dword ptr [ebp - 0x11b8]
            //   83c802               | or                  eax, 2

        $sequence_3 = { 83f81f 0f8791140000 52 51 e8???????? 83c408 8bb51ceeffff }
            // n = 7, score = 200
            //   83f81f               | cmp                 eax, 0x1f
            //   0f8791140000         | ja                  0x1497
            //   52                   | push                edx
            //   51                   | push                ecx
            //   e8????????           |                     
            //   83c408               | add                 esp, 8
            //   8bb51ceeffff         | mov                 esi, dword ptr [ebp - 0x11e4]

        $sequence_4 = { 8bc7 83e03f 6bc838 8b049508e34100 8b440818 83f8ff }
            // n = 6, score = 200
            //   8bc7                 | mov                 eax, edi
            //   83e03f               | and                 eax, 0x3f
            //   6bc838               | imul                ecx, eax, 0x38
            //   8b049508e34100       | mov                 eax, dword ptr [edx*4 + 0x41e308]
            //   8b440818             | mov                 eax, dword ptr [eax + ecx + 0x18]
            //   83f8ff               | cmp                 eax, -1

        $sequence_5 = { 50 51 8d85e8dfffff 50 e8???????? }
            // n = 5, score = 200
            //   50                   | push                eax
            //   51                   | push                ecx
            //   8d85e8dfffff         | lea                 eax, [ebp - 0x2018]
            //   50                   | push                eax
            //   e8????????           |                     

        $sequence_6 = { 7432 8d4123 83e0e0 8948fc }
            // n = 4, score = 200
            //   7432                 | je                  0x34
            //   8d4123               | lea                 eax, [ecx + 0x23]
            //   83e0e0               | and                 eax, 0xffffffe0
            //   8948fc               | mov                 dword ptr [eax - 4], ecx

        $sequence_7 = { 8bc8 c645fc32 e8???????? 8d8d10efffff e8???????? 8d8db0eeffff }
            // n = 6, score = 200
            //   8bc8                 | mov                 ecx, eax
            //   c645fc32             | mov                 byte ptr [ebp - 4], 0x32
            //   e8????????           |                     
            //   8d8d10efffff         | lea                 ecx, [ebp - 0x10f0]
            //   e8????????           |                     
            //   8d8db0eeffff         | lea                 ecx, [ebp - 0x1150]

        $sequence_8 = { 8bca 33c0 6689442448 8d7102 668b01 83c102 6685c0 }
            // n = 7, score = 200
            //   8bca                 | mov                 ecx, edx
            //   33c0                 | xor                 eax, eax
            //   6689442448           | mov                 word ptr [esp + 0x48], ax
            //   8d7102               | lea                 esi, [ecx + 2]
            //   668b01               | mov                 ax, word ptr [ecx]
            //   83c102               | add                 ecx, 2
            //   6685c0               | test                ax, ax

        $sequence_9 = { 8d8528efffff 83bd3cefffff08 8d8dd0efffff ffb538efffff 0f438528efffff 50 e8???????? }
            // n = 7, score = 200
            //   8d8528efffff         | lea                 eax, [ebp - 0x10d8]
            //   83bd3cefffff08       | cmp                 dword ptr [ebp - 0x10c4], 8
            //   8d8dd0efffff         | lea                 ecx, [ebp - 0x1030]
            //   ffb538efffff         | push                dword ptr [ebp - 0x10c8]
            //   0f438528efffff       | cmovae              eax, dword ptr [ebp - 0x10d8]
            //   50                   | push                eax
            //   e8????????           |                     

    condition:
        7 of them and filesize < 286720
}
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