SYMBOLCOMMON_NAMEaka. SYNONYMS
win.fakeword (Back to overview)

FakeWord


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References
2014-07-02Trend MicroKervin Alintanahin, Ronnie Giagone
@online{alintanahin:20140702:kivars:4fe6877, author = {Kervin Alintanahin and Ronnie Giagone}, title = {{KIVARS With Venom: Targeted Attacks Upgrade with 64-bit “Support”}}, date = {2014-07-02}, organization = {Trend Micro}, url = {https://blog.trendmicro.com/trendlabs-security-intelligence/kivars-with-venom-targeted-attacks-upgrade-with-64-bit-support/}, language = {English}, urldate = {2020-06-19} } KIVARS With Venom: Targeted Attacks Upgrade with 64-bit “Support”
FakeWord KIVARS PLEAD Poison RAT Zeus
Yara Rules
[TLP:WHITE] win_fakeword_auto (20220516 | Detects win.fakeword.)
rule win_fakeword_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-05-16"
        version = "1"
        description = "Detects win.fakeword."
        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.fakeword"
        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 = { 8b15???????? 892d???????? 3bd3 7f1a 6a0a ff15???????? }
            // n = 6, score = 200
            //   8b15????????         |                     
            //   892d????????         |                     
            //   3bd3                 | cmp                 edx, ebx
            //   7f1a                 | jg                  0x1c
            //   6a0a                 | push                0xa
            //   ff15????????         |                     

        $sequence_1 = { 6a00 ffd7 8945e4 ffd3 3db7000000 }
            // n = 5, score = 200
            //   6a00                 | push                0
            //   ffd7                 | call                edi
            //   8945e4               | mov                 dword ptr [ebp - 0x1c], eax
            //   ffd3                 | call                ebx
            //   3db7000000           | cmp                 eax, 0xb7

        $sequence_2 = { 33c0 8dbc2464030000 f3ab 8a84246c130000 c744240400000000 3c02 }
            // n = 6, score = 200
            //   33c0                 | xor                 eax, eax
            //   8dbc2464030000       | lea                 edi, [esp + 0x364]
            //   f3ab                 | rep stosd           dword ptr es:[edi], eax
            //   8a84246c130000       | mov                 al, byte ptr [esp + 0x136c]
            //   c744240400000000     | mov                 dword ptr [esp + 4], 0
            //   3c02                 | cmp                 al, 2

        $sequence_3 = { 8d442444 52 56 50 57 ff15???????? 89442418 }
            // n = 7, score = 200
            //   8d442444             | lea                 eax, [esp + 0x44]
            //   52                   | push                edx
            //   56                   | push                esi
            //   50                   | push                eax
            //   57                   | push                edi
            //   ff15????????         |                     
            //   89442418             | mov                 dword ptr [esp + 0x18], eax

        $sequence_4 = { e8???????? 8b0d???????? 83c40c 83c704 6a00 57 56 }
            // n = 7, score = 200
            //   e8????????           |                     
            //   8b0d????????         |                     
            //   83c40c               | add                 esp, 0xc
            //   83c704               | add                 edi, 4
            //   6a00                 | push                0
            //   57                   | push                edi
            //   56                   | push                esi

        $sequence_5 = { 25ffff0000 81e2ffff0000 51 8b4c240a }
            // n = 4, score = 200
            //   25ffff0000           | and                 eax, 0xffff
            //   81e2ffff0000         | and                 edx, 0xffff
            //   51                   | push                ecx
            //   8b4c240a             | mov                 ecx, dword ptr [esp + 0xa]

        $sequence_6 = { 32d8 885c29ff 41 8d41ff 3bc2 7cbd }
            // n = 6, score = 200
            //   32d8                 | xor                 bl, al
            //   885c29ff             | mov                 byte ptr [ecx + ebp - 1], bl
            //   41                   | inc                 ecx
            //   8d41ff               | lea                 eax, [ecx - 1]
            //   3bc2                 | cmp                 eax, edx
            //   7cbd                 | jl                  0xffffffbf

        $sequence_7 = { 2bc7 3d20010000 7f0e 83f812 0f8e0d010000 ba01000000 89542440 }
            // n = 7, score = 200
            //   2bc7                 | sub                 eax, edi
            //   3d20010000           | cmp                 eax, 0x120
            //   7f0e                 | jg                  0x10
            //   83f812               | cmp                 eax, 0x12
            //   0f8e0d010000         | jle                 0x113
            //   ba01000000           | mov                 edx, 1
            //   89542440             | mov                 dword ptr [esp + 0x40], edx

        $sequence_8 = { 891d???????? 891d???????? 56 ff15???????? 57 }
            // n = 5, score = 200
            //   891d????????         |                     
            //   891d????????         |                     
            //   56                   | push                esi
            //   ff15????????         |                     
            //   57                   | push                edi

        $sequence_9 = { 8b842420110000 3d00010000 0f8520020000 8b9c2424110000 8b03 }
            // n = 5, score = 200
            //   8b842420110000       | mov                 eax, dword ptr [esp + 0x1120]
            //   3d00010000           | cmp                 eax, 0x100
            //   0f8520020000         | jne                 0x226
            //   8b9c2424110000       | mov                 ebx, dword ptr [esp + 0x1124]
            //   8b03                 | mov                 eax, dword ptr [ebx]

    condition:
        7 of them and filesize < 98304
}
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