SYMBOLCOMMON_NAMEaka. SYNONYMS
win.zeus_action (Back to overview)

ZeusAction


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References
2019-06-07Twitter (@benkow_)Benoît Ancel
@online{ancel:20190607:zeusaction:5977152, author = {Benoît Ancel}, title = {{Tweet on ZeusAction hashes}}, date = {2019-06-07}, organization = {Twitter (@benkow_)}, url = {https://twitter.com/benkow_/status/1136983062699487232}, language = {English}, urldate = {2020-01-06} } Tweet on ZeusAction hashes
ZeusAction
Yara Rules
[TLP:WHITE] win_zeus_action_auto (20200817 | autogenerated rule brought to you by yara-signator)
rule win_zeus_action_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2020-08-17"
        version = "1"
        description = "autogenerated rule brought to you by yara-signator"
        tool = "yara-signator v0.4.0"
        tool_config = "callsandjumps;datarefs;binvalue"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.zeus_action"
        malpedia_rule_date = "20200817"
        malpedia_hash = "8c895fd01eccb47a6225bcb1a3ba53cbb98644c5"
        malpedia_version = "20200817"
        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 / approach 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 = { 7454 8b44241c 40 50 6a08 ffd5 50 }
            // n = 7, score = 200
            //   7454                 | je                  0x56
            //   8b44241c             | mov                 eax, dword ptr [esp + 0x1c]
            //   40                   | inc                 eax
            //   50                   | push                eax
            //   6a08                 | push                8
            //   ffd5                 | call                ebp
            //   50                   | push                eax

        $sequence_1 = { 50 53 ff75f8 c745f008020000 ff15???????? 85c0 0f85f1000000 }
            // n = 7, score = 200
            //   50                   | push                eax
            //   53                   | push                ebx
            //   ff75f8               | push                dword ptr [ebp - 8]
            //   c745f008020000       | mov                 dword ptr [ebp - 0x10], 0x208
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax
            //   0f85f1000000         | jne                 0xf7

        $sequence_2 = { 6af1 ff15???????? 50 ff15???????? e8???????? 84c0 0f84bd010000 }
            // n = 7, score = 200
            //   6af1                 | push                -0xf
            //   ff15????????         |                     
            //   50                   | push                eax
            //   ff15????????         |                     
            //   e8????????           |                     
            //   84c0                 | test                al, al
            //   0f84bd010000         | je                  0x1c3

        $sequence_3 = { 7409 ff36 ffd7 56 ffd7 59 59 }
            // n = 7, score = 200
            //   7409                 | je                  0xb
            //   ff36                 | push                dword ptr [esi]
            //   ffd7                 | call                edi
            //   56                   | push                esi
            //   ffd7                 | call                edi
            //   59                   | pop                 ecx
            //   59                   | pop                 ecx

        $sequence_4 = { 56 8b7508 85f6 743f 53 57 8d5e04 }
            // n = 7, score = 200
            //   56                   | push                esi
            //   8b7508               | mov                 esi, dword ptr [ebp + 8]
            //   85f6                 | test                esi, esi
            //   743f                 | je                  0x41
            //   53                   | push                ebx
            //   57                   | push                edi
            //   8d5e04               | lea                 ebx, [esi + 4]

        $sequence_5 = { 3355fc 8bc6 8bca 0facc80d 33f0 c1e90d 33d1 }
            // n = 7, score = 200
            //   3355fc               | xor                 edx, dword ptr [ebp - 4]
            //   8bc6                 | mov                 eax, esi
            //   8bca                 | mov                 ecx, edx
            //   0facc80d             | shrd                eax, ecx, 0xd
            //   33f0                 | xor                 esi, eax
            //   c1e90d               | shr                 ecx, 0xd
            //   33d1                 | xor                 edx, ecx

        $sequence_6 = { 235064 898854010000 8b88b0000000 895de4 2388c8000000 8bd8 }
            // n = 6, score = 200
            //   235064               | and                 edx, dword ptr [eax + 0x64]
            //   898854010000         | mov                 dword ptr [eax + 0x154], ecx
            //   8b88b0000000         | mov                 ecx, dword ptr [eax + 0xb0]
            //   895de4               | mov                 dword ptr [ebp - 0x1c], ebx
            //   2388c8000000         | and                 ecx, dword ptr [eax + 0xc8]
            //   8bd8                 | mov                 ebx, eax

        $sequence_7 = { 8bd9 6a10 e8???????? 8b55f8 59 89049e 8b4a0c }
            // n = 7, score = 200
            //   8bd9                 | mov                 ebx, ecx
            //   6a10                 | push                0x10
            //   e8????????           |                     
            //   8b55f8               | mov                 edx, dword ptr [ebp - 8]
            //   59                   | pop                 ecx
            //   89049e               | mov                 dword ptr [esi + ebx*4], eax
            //   8b4a0c               | mov                 ecx, dword ptr [edx + 0xc]

        $sequence_8 = { 66894df2 eb04 668945f2 8dbaa8000000 03bad8750000 8d75ec a5 }
            // n = 7, score = 200
            //   66894df2             | mov                 word ptr [ebp - 0xe], cx
            //   eb04                 | jmp                 6
            //   668945f2             | mov                 word ptr [ebp - 0xe], ax
            //   8dbaa8000000         | lea                 edi, [edx + 0xa8]
            //   03bad8750000         | add                 edi, dword ptr [edx + 0x75d8]
            //   8d75ec               | lea                 esi, [ebp - 0x14]
            //   a5                   | movsd               dword ptr es:[edi], dword ptr [esi]

        $sequence_9 = { 8bf8 c1e710 8bf0 ba00ff0000 23f2 0bfe 0fb67305 }
            // n = 7, score = 200
            //   8bf8                 | mov                 edi, eax
            //   c1e710               | shl                 edi, 0x10
            //   8bf0                 | mov                 esi, eax
            //   ba00ff0000           | mov                 edx, 0xff00
            //   23f2                 | and                 esi, edx
            //   0bfe                 | or                  edi, esi
            //   0fb67305             | movzx               esi, byte ptr [ebx + 5]

    condition:
        7 of them and filesize < 827392
}
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