SYMBOLCOMMON_NAMEaka. SYNONYMS
win.comlook (Back to overview)

ComLook

Actor(s): Turla Group


There is no description at this point.

References
2022-01-25Möbius Strip Reverse EngineeringRolf Rolles
@online{rolles:20220125:exhaustively:bbe8a55, author = {Rolf Rolles}, title = {{An Exhaustively Analyzed IDB for ComLook}}, date = {2022-01-25}, organization = {Möbius Strip Reverse Engineering}, url = {https://www.msreverseengineering.com/blog/2022/1/25/an-exhaustively-analyzed-idb-for-comlook}, language = {English}, urldate = {2022-01-28} } An Exhaustively Analyzed IDB for ComLook
ComLook
2022-01-20Twitter (@ClearskySec)ClearSky Cybersecurity
@online{cybersecurity:20220120:comlook:ca9c0aa, author = {ClearSky Cybersecurity}, title = {{Tweet on ComLook backdoor used by Turla}}, date = {2022-01-20}, organization = {Twitter (@ClearskySec)}, url = {https://twitter.com/ClearskySec/status/1484211242474561540}, language = {English}, urldate = {2022-01-25} } Tweet on ComLook backdoor used by Turla
ComLook
Yara Rules
[TLP:WHITE] win_comlook_auto (20220808 | Detects win.comlook.)
rule win_comlook_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-08-05"
        version = "1"
        description = "Detects win.comlook."
        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.comlook"
        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 = { e9???????? 8b55ec 52 8b45e8 50 8b4df4 51 }
            // n = 7, score = 100
            //   e9????????           |                     
            //   8b55ec               | mov                 edx, dword ptr [ebp - 0x14]
            //   52                   | push                edx
            //   8b45e8               | mov                 eax, dword ptr [ebp - 0x18]
            //   50                   | push                eax
            //   8b4df4               | mov                 ecx, dword ptr [ebp - 0xc]
            //   51                   | push                ecx

        $sequence_1 = { ff15???????? 3bf4 e8???????? 8b55fc 8b4214 8945f8 8b4dfc }
            // n = 7, score = 100
            //   ff15????????         |                     
            //   3bf4                 | cmp                 esi, esp
            //   e8????????           |                     
            //   8b55fc               | mov                 edx, dword ptr [ebp - 4]
            //   8b4214               | mov                 eax, dword ptr [edx + 0x14]
            //   8945f8               | mov                 dword ptr [ebp - 8], eax
            //   8b4dfc               | mov                 ecx, dword ptr [ebp - 4]

        $sequence_2 = { c7459400000000 8b4598 83b83805000000 7407 c745f09ce31f10 8b4d0c 894d90 }
            // n = 7, score = 100
            //   c7459400000000       | mov                 dword ptr [ebp - 0x6c], 0
            //   8b4598               | mov                 eax, dword ptr [ebp - 0x68]
            //   83b83805000000       | cmp                 dword ptr [eax + 0x538], 0
            //   7407                 | je                  9
            //   c745f09ce31f10       | mov                 dword ptr [ebp - 0x10], 0x101fe39c
            //   8b4d0c               | mov                 ecx, dword ptr [ebp + 0xc]
            //   894d90               | mov                 dword ptr [ebp - 0x70], ecx

        $sequence_3 = { eb51 c744242440ba1a10 897c2418 c744241c3cba1a10 897c2420 89ac24b0000000 eb3c }
            // n = 7, score = 100
            //   eb51                 | jmp                 0x53
            //   c744242440ba1a10     | mov                 dword ptr [esp + 0x24], 0x101aba40
            //   897c2418             | mov                 dword ptr [esp + 0x18], edi
            //   c744241c3cba1a10     | mov                 dword ptr [esp + 0x1c], 0x101aba3c
            //   897c2420             | mov                 dword ptr [esp + 0x20], edi
            //   89ac24b0000000       | mov                 dword ptr [esp + 0xb0], ebp
            //   eb3c                 | jmp                 0x3e

        $sequence_4 = { e8???????? c645fc12 8bb5c8fcffff 85f6 744b 83c604 833e00 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   c645fc12             | mov                 byte ptr [ebp - 4], 0x12
            //   8bb5c8fcffff         | mov                 esi, dword ptr [ebp - 0x338]
            //   85f6                 | test                esi, esi
            //   744b                 | je                  0x4d
            //   83c604               | add                 esi, 4
            //   833e00               | cmp                 dword ptr [esi], 0

        $sequence_5 = { e9???????? 8d4d24 e9???????? 8b542408 8d420c 8b4aa4 33c8 }
            // n = 7, score = 100
            //   e9????????           |                     
            //   8d4d24               | lea                 ecx, [ebp + 0x24]
            //   e9????????           |                     
            //   8b542408             | mov                 edx, dword ptr [esp + 8]
            //   8d420c               | lea                 eax, [edx + 0xc]
            //   8b4aa4               | mov                 ecx, dword ptr [edx - 0x5c]
            //   33c8                 | xor                 ecx, eax

        $sequence_6 = { ffd2 8ac3 e9???????? 68???????? 8d4dd0 e8???????? 8d45a4 }
            // n = 7, score = 100
            //   ffd2                 | call                edx
            //   8ac3                 | mov                 al, bl
            //   e9????????           |                     
            //   68????????           |                     
            //   8d4dd0               | lea                 ecx, [ebp - 0x30]
            //   e8????????           |                     
            //   8d45a4               | lea                 eax, [ebp - 0x5c]

        $sequence_7 = { 8b55f8 c1e210 8955f4 8b45f8 8945e8 8b4de8 83e904 }
            // n = 7, score = 100
            //   8b55f8               | mov                 edx, dword ptr [ebp - 8]
            //   c1e210               | shl                 edx, 0x10
            //   8955f4               | mov                 dword ptr [ebp - 0xc], edx
            //   8b45f8               | mov                 eax, dword ptr [ebp - 8]
            //   8945e8               | mov                 dword ptr [ebp - 0x18], eax
            //   8b4de8               | mov                 ecx, dword ptr [ebp - 0x18]
            //   83e904               | sub                 ecx, 4

        $sequence_8 = { e8???????? a1???????? 33c4 89442418 53 8b5c2424 8b435c }
            // n = 7, score = 100
            //   e8????????           |                     
            //   a1????????           |                     
            //   33c4                 | xor                 eax, esp
            //   89442418             | mov                 dword ptr [esp + 0x18], eax
            //   53                   | push                ebx
            //   8b5c2424             | mov                 ebx, dword ptr [esp + 0x24]
            //   8b435c               | mov                 eax, dword ptr [ebx + 0x5c]

        $sequence_9 = { eb11 8b5518 8b4510 33c9 3b4218 0f9fc1 894ddc }
            // n = 7, score = 100
            //   eb11                 | jmp                 0x13
            //   8b5518               | mov                 edx, dword ptr [ebp + 0x18]
            //   8b4510               | mov                 eax, dword ptr [ebp + 0x10]
            //   33c9                 | xor                 ecx, ecx
            //   3b4218               | cmp                 eax, dword ptr [edx + 0x18]
            //   0f9fc1               | setg                cl
            //   894ddc               | mov                 dword ptr [ebp - 0x24], ecx

    condition:
        7 of them and filesize < 4553728
}
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