SYMBOLCOMMON_NAMEaka. SYNONYMS
win.fonix (Back to overview)

FONIX


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References
2021-02-04BitdefenderBogdan Botezatu
@online{botezatu:20210204:fonix:9d53bd8, author = {Bogdan Botezatu}, title = {{Fonix Ransomware Decryptor}}, date = {2021-02-04}, organization = {Bitdefender}, url = {https://labs.bitdefender.com/2021/02/fonix-ransomware-decryptor/}, language = {English}, urldate = {2021-05-04} } Fonix Ransomware Decryptor
FONIX
2020-10-06SentinelOneJim Walter
@online{walter:20201006:fonix:9a3fb41, author = {Jim Walter}, title = {{The FONIX RaaS | New Low-Key Threat with Unnecessary Complexities}}, date = {2020-10-06}, organization = {SentinelOne}, url = {https://labs.sentinelone.com/the-fonix-raas-new-low-key-threat-with-unnecessary-complexities/}, language = {English}, urldate = {2020-10-12} } The FONIX RaaS | New Low-Key Threat with Unnecessary Complexities
FONIX
Yara Rules
[TLP:WHITE] win_fonix_auto (20220516 | Detects win.fonix.)
rule win_fonix_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-05-16"
        version = "1"
        description = "Detects win.fonix."
        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.fonix"
        malpedia_rule_date = "20220513"
        malpedia_hash = "7f4b2229e6ae614d86d74917f6d5b41890e62a26"
        malpedia_version = "20220516"
        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 = { 83611000 83611400 e8???????? 32d2 c645fc01 8bce e8???????? }
            // n = 7, score = 100
            //   83611000             | and                 dword ptr [ecx + 0x10], 0
            //   83611400             | and                 dword ptr [ecx + 0x14], 0
            //   e8????????           |                     
            //   32d2                 | xor                 dl, dl
            //   c645fc01             | mov                 byte ptr [ebp - 4], 1
            //   8bce                 | mov                 ecx, esi
            //   e8????????           |                     

        $sequence_1 = { 8bc7 83781410 7202 8b00 ff7710 8d4dd8 50 }
            // n = 7, score = 100
            //   8bc7                 | mov                 eax, edi
            //   83781410             | cmp                 dword ptr [eax + 0x14], 0x10
            //   7202                 | jb                  4
            //   8b00                 | mov                 eax, dword ptr [eax]
            //   ff7710               | push                dword ptr [edi + 0x10]
            //   8d4dd8               | lea                 ecx, [ebp - 0x28]
            //   50                   | push                eax

        $sequence_2 = { 85ff 0f8586000000 6a3a 56 e8???????? 8bf8 59 }
            // n = 7, score = 100
            //   85ff                 | test                edi, edi
            //   0f8586000000         | jne                 0x8c
            //   6a3a                 | push                0x3a
            //   56                   | push                esi
            //   e8????????           |                     
            //   8bf8                 | mov                 edi, eax
            //   59                   | pop                 ecx

        $sequence_3 = { 56 8bcf c705????????38624900 e8???????? 68???????? e8???????? 59 }
            // n = 7, score = 100
            //   56                   | push                esi
            //   8bcf                 | mov                 ecx, edi
            //   c705????????38624900     |     
            //   e8????????           |                     
            //   68????????           |                     
            //   e8????????           |                     
            //   59                   | pop                 ecx

        $sequence_4 = { d1e8 394540 7710 6a01 8d4d38 e8???????? }
            // n = 6, score = 100
            //   d1e8                 | shr                 eax, 1
            //   394540               | cmp                 dword ptr [ebp + 0x40], eax
            //   7710                 | ja                  0x12
            //   6a01                 | push                1
            //   8d4d38               | lea                 ecx, [ebp + 0x38]
            //   e8????????           |                     

        $sequence_5 = { 75f8 85ff 0f8eac000000 c745e044ae4900 8955e4 8955e8 8d04bd04000000 }
            // n = 7, score = 100
            //   75f8                 | jne                 0xfffffffa
            //   85ff                 | test                edi, edi
            //   0f8eac000000         | jle                 0xb2
            //   c745e044ae4900       | mov                 dword ptr [ebp - 0x20], 0x49ae44
            //   8955e4               | mov                 dword ptr [ebp - 0x1c], edx
            //   8955e8               | mov                 dword ptr [ebp - 0x18], edx
            //   8d04bd04000000       | lea                 eax, [edi*4 + 4]

        $sequence_6 = { 7411 c74608???????? c7463c283c4900 894df0 8b4608 c74604???????? 8b4004 }
            // n = 7, score = 100
            //   7411                 | je                  0x13
            //   c74608????????       |                     
            //   c7463c283c4900       | mov                 dword ptr [esi + 0x3c], 0x493c28
            //   894df0               | mov                 dword ptr [ebp - 0x10], ecx
            //   8b4608               | mov                 eax, dword ptr [esi + 8]
            //   c74604????????       |                     
            //   8b4004               | mov                 eax, dword ptr [eax + 4]

        $sequence_7 = { e8???????? 50 8bcd e8???????? b301 84ff }
            // n = 6, score = 100
            //   e8????????           |                     
            //   50                   | push                eax
            //   8bcd                 | mov                 ecx, ebp
            //   e8????????           |                     
            //   b301                 | mov                 bl, 1
            //   84ff                 | test                bh, bh

        $sequence_8 = { 8d8d20010000 e8???????? c78514010000d0554900 c78518010000fc554900 c7851c01000020564900 }
            // n = 5, score = 100
            //   8d8d20010000         | lea                 ecx, [ebp + 0x120]
            //   e8????????           |                     
            //   c78514010000d0554900     | mov    dword ptr [ebp + 0x114], 0x4955d0
            //   c78518010000fc554900     | mov    dword ptr [ebp + 0x118], 0x4955fc
            //   c7851c01000020564900     | mov    dword ptr [ebp + 0x11c], 0x495620

        $sequence_9 = { c645fc1b f3ab 85d2 7407 e8???????? eb05 e8???????? }
            // n = 7, score = 100
            //   c645fc1b             | mov                 byte ptr [ebp - 4], 0x1b
            //   f3ab                 | rep stosd           dword ptr es:[edi], eax
            //   85d2                 | test                edx, edx
            //   7407                 | je                  9
            //   e8????????           |                     
            //   eb05                 | jmp                 7
            //   e8????????           |                     

    condition:
        7 of them and filesize < 2226176
}
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