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 (20201023 | autogenerated rule brought to you by yara-signator)
rule win_fakeword_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2020-12-22"
        version = "1"
        description = "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 = "20201222"
        malpedia_hash = "30354d830a29f0fbd3714d93d94dea941d77a130"
        malpedia_version = "20201023"
        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 = { 56 ffd7 68???????? 56 ffd7 8d542410 }
            // n = 6, score = 200
            //   56                   | push                esi
            //   ffd7                 | call                edi
            //   68????????           |                     
            //   56                   | push                esi
            //   ffd7                 | call                edi
            //   8d542410             | lea                 edx, [esp + 0x10]

        $sequence_1 = { 85c0 7496 b900010000 33c0 8dbc2494000000 f3ab }
            // n = 6, score = 200
            //   85c0                 | test                eax, eax
            //   7496                 | je                  0xffffff98
            //   b900010000           | mov                 ecx, 0x100
            //   33c0                 | xor                 eax, eax
            //   8dbc2494000000       | lea                 edi, [esp + 0x94]
            //   f3ab                 | rep stosd           dword ptr es:[edi], eax

        $sequence_2 = { 57 ff15???????? 89442418 eb17 8d4c2424 8d542444 51 }
            // n = 7, score = 200
            //   57                   | push                edi
            //   ff15????????         |                     
            //   89442418             | mov                 dword ptr [esp + 0x18], eax
            //   eb17                 | jmp                 0x19
            //   8d4c2424             | lea                 ecx, [esp + 0x24]
            //   8d542444             | lea                 edx, [esp + 0x44]
            //   51                   | push                ecx

        $sequence_3 = { 8d8c2477030000 50 56 68???????? 51 c684248403000027 }
            // n = 6, score = 200
            //   8d8c2477030000       | lea                 ecx, [esp + 0x377]
            //   50                   | push                eax
            //   56                   | push                esi
            //   68????????           |                     
            //   51                   | push                ecx
            //   c684248403000027     | mov                 byte ptr [esp + 0x384], 0x27

        $sequence_4 = { 47 8d942410010000 57 52 ffd6 }
            // n = 5, score = 200
            //   47                   | inc                 edi
            //   8d942410010000       | lea                 edx, [esp + 0x110]
            //   57                   | push                edi
            //   52                   | push                edx
            //   ffd6                 | call                esi

        $sequence_5 = { 3bc7 7cf5 56 e8???????? 56 8bf8 ff15???????? }
            // n = 7, score = 200
            //   3bc7                 | cmp                 eax, edi
            //   7cf5                 | jl                  0xfffffff7
            //   56                   | push                esi
            //   e8????????           |                     
            //   56                   | push                esi
            //   8bf8                 | mov                 edi, eax
            //   ff15????????         |                     

        $sequence_6 = { 56 e8???????? c744240c01000000 5f 8b442408 5e }
            // n = 6, score = 200
            //   56                   | push                esi
            //   e8????????           |                     
            //   c744240c01000000     | mov                 dword ptr [esp + 0xc], 1
            //   5f                   | pop                 edi
            //   8b442408             | mov                 eax, dword ptr [esp + 8]
            //   5e                   | pop                 esi

        $sequence_7 = { 8d7e05 8d442410 6a00 50 }
            // n = 4, score = 200
            //   8d7e05               | lea                 edi, [esi + 5]
            //   8d442410             | lea                 eax, [esp + 0x10]
            //   6a00                 | push                0
            //   50                   | push                eax

        $sequence_8 = { 5d 83c41c c20c00 8b542924 8b44291c 53 56 }
            // n = 7, score = 200
            //   5d                   | pop                 ebp
            //   83c41c               | add                 esp, 0x1c
            //   c20c00               | ret                 0xc
            //   8b542924             | mov                 edx, dword ptr [ecx + ebp + 0x24]
            //   8b44291c             | mov                 eax, dword ptr [ecx + ebp + 0x1c]
            //   53                   | push                ebx
            //   56                   | push                esi

        $sequence_9 = { 50 ffd3 83c40c 8d4c2410 51 56 ffd7 }
            // n = 7, score = 200
            //   50                   | push                eax
            //   ffd3                 | call                ebx
            //   83c40c               | add                 esp, 0xc
            //   8d4c2410             | lea                 ecx, [esp + 0x10]
            //   51                   | push                ecx
            //   56                   | push                esi
            //   ffd7                 | call                edi

    condition:
        7 of them and filesize < 98304
}
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