SYMBOLCOMMON_NAMEaka. SYNONYMS
win.catchamas (Back to overview)

Catchamas

Actor(s): Thrip


There is no description at this point.

References
2018-06-19SymantecSecurity Response Attack Investigation Team
@online{team:20180619:thrip:4662184, author = {Security Response Attack Investigation Team}, title = {{Thrip: Espionage Group Hits Satellite, Telecoms, and Defense Companies}}, date = {2018-06-19}, organization = {Symantec}, url = {https://www.symantec.com/blogs/threat-intelligence/thrip-hits-satellite-telecoms-defense-targets}, language = {English}, urldate = {2020-01-09} } Thrip: Espionage Group Hits Satellite, Telecoms, and Defense Companies
Catchamas Rikamanu Spedear WMI Ghost Thrip
Yara Rules
[TLP:WHITE] win_catchamas_auto (20220411 | Detects win.catchamas.)
rule win_catchamas_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-04-08"
        version = "1"
        description = "Detects win.catchamas."
        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.catchamas"
        malpedia_rule_date = "20220405"
        malpedia_hash = "ecd38294bd47d5589be5cd5490dc8bb4804afc2a"
        malpedia_version = "20220411"
        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 = { 83c40c eb10 8b45d8 50 57 8d45c4 e8???????? }
            // n = 7, score = 200
            //   83c40c               | add                 esp, 0xc
            //   eb10                 | jmp                 0x12
            //   8b45d8               | mov                 eax, dword ptr [ebp - 0x28]
            //   50                   | push                eax
            //   57                   | push                edi
            //   8d45c4               | lea                 eax, dword ptr [ebp - 0x3c]
            //   e8????????           |                     

        $sequence_1 = { 55 53 53 8d5c2438 e8???????? 50 }
            // n = 6, score = 200
            //   55                   | push                ebp
            //   53                   | push                ebx
            //   53                   | push                ebx
            //   8d5c2438             | lea                 ebx, dword ptr [esp + 0x38]
            //   e8????????           |                     
            //   50                   | push                eax

        $sequence_2 = { 0f85c9000000 85db 747d 53 ff15???????? 6a00 }
            // n = 6, score = 200
            //   0f85c9000000         | jne                 0xcf
            //   85db                 | test                ebx, ebx
            //   747d                 | je                  0x7f
            //   53                   | push                ebx
            //   ff15????????         |                     
            //   6a00                 | push                0

        $sequence_3 = { 8bec 83e4f8 81ec2c0e0000 a1???????? 33c4 }
            // n = 5, score = 200
            //   8bec                 | mov                 ebp, esp
            //   83e4f8               | and                 esp, 0xfffffff8
            //   81ec2c0e0000         | sub                 esp, 0xe2c
            //   a1????????           |                     
            //   33c4                 | xor                 eax, esp

        $sequence_4 = { 57 6a0f ff15???????? 8bf8 897c2410 ff15???????? }
            // n = 6, score = 200
            //   57                   | push                edi
            //   6a0f                 | push                0xf
            //   ff15????????         |                     
            //   8bf8                 | mov                 edi, eax
            //   897c2410             | mov                 dword ptr [esp + 0x10], edi
            //   ff15????????         |                     

        $sequence_5 = { 8944240c eb04 8b44240c 8d5c0c10 880c18 8bc1 }
            // n = 6, score = 200
            //   8944240c             | mov                 dword ptr [esp + 0xc], eax
            //   eb04                 | jmp                 6
            //   8b44240c             | mov                 eax, dword ptr [esp + 0xc]
            //   8d5c0c10             | lea                 ebx, dword ptr [esp + ecx + 0x10]
            //   880c18               | mov                 byte ptr [eax + ebx], cl
            //   8bc1                 | mov                 eax, ecx

        $sequence_6 = { 3b5c2410 7c86 5e 5d 57 ff15???????? ff15???????? }
            // n = 7, score = 200
            //   3b5c2410             | cmp                 ebx, dword ptr [esp + 0x10]
            //   7c86                 | jl                  0xffffff88
            //   5e                   | pop                 esi
            //   5d                   | pop                 ebp
            //   57                   | push                edi
            //   ff15????????         |                     
            //   ff15????????         |                     

        $sequence_7 = { 56 57 6877630100 8d8424c1620100 6a00 50 8bf1 }
            // n = 7, score = 200
            //   56                   | push                esi
            //   57                   | push                edi
            //   6877630100           | push                0x16377
            //   8d8424c1620100       | lea                 eax, dword ptr [esp + 0x162c1]
            //   6a00                 | push                0
            //   50                   | push                eax
            //   8bf1                 | mov                 esi, ecx

        $sequence_8 = { 57 ff15???????? 8b542408 52 6a00 }
            // n = 5, score = 200
            //   57                   | push                edi
            //   ff15????????         |                     
            //   8b542408             | mov                 edx, dword ptr [esp + 8]
            //   52                   | push                edx
            //   6a00                 | push                0

        $sequence_9 = { 51 57 8bf0 50 ebbd e8???????? }
            // n = 6, score = 200
            //   51                   | push                ecx
            //   57                   | push                edi
            //   8bf0                 | mov                 esi, eax
            //   50                   | push                eax
            //   ebbd                 | jmp                 0xffffffbf
            //   e8????????           |                     

    condition:
        7 of them and filesize < 368640
}
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