SYMBOLCOMMON_NAMEaka. SYNONYMS
win.jimmy (Back to overview)

Jimmy


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References
2017-08-29Kaspersky LabsSergey Yunakovsky
@online{yunakovsky:20170829:jimmy:4b0c857, author = {Sergey Yunakovsky}, title = {{Jimmy Nukebot: from Neutrino with love}}, date = {2017-08-29}, organization = {Kaspersky Labs}, url = {https://securelist.com/jimmy-nukebot-from-neutrino-with-love/81667/}, language = {English}, urldate = {2019-12-20} } Jimmy Nukebot: from Neutrino with love
Jimmy
Yara Rules
[TLP:WHITE] win_jimmy_auto (20220516 | Detects win.jimmy.)
rule win_jimmy_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-05-16"
        version = "1"
        description = "Detects win.jimmy."
        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.jimmy"
        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 = { 7418 ff75f4 e8???????? 59 0fb6c0 85c0 }
            // n = 6, score = 400
            //   7418                 | je                  0x1a
            //   ff75f4               | push                dword ptr [ebp - 0xc]
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   0fb6c0               | movzx               eax, al
            //   85c0                 | test                eax, eax

        $sequence_1 = { 8985ccfdffff 83bdccfdffffff 750b 8a85cbfdffff e9???????? c785d0fdffff2c020000 8d85d0fdffff }
            // n = 7, score = 400
            //   8985ccfdffff         | mov                 dword ptr [ebp - 0x234], eax
            //   83bdccfdffffff       | cmp                 dword ptr [ebp - 0x234], -1
            //   750b                 | jne                 0xd
            //   8a85cbfdffff         | mov                 al, byte ptr [ebp - 0x235]
            //   e9????????           |                     
            //   c785d0fdffff2c020000     | mov    dword ptr [ebp - 0x230], 0x22c
            //   8d85d0fdffff         | lea                 eax, [ebp - 0x230]

        $sequence_2 = { 85c0 7502 eb08 c645ff01 33c0 7597 }
            // n = 6, score = 400
            //   85c0                 | test                eax, eax
            //   7502                 | jne                 4
            //   eb08                 | jmp                 0xa
            //   c645ff01             | mov                 byte ptr [ebp - 1], 1
            //   33c0                 | xor                 eax, eax
            //   7597                 | jne                 0xffffff99

        $sequence_3 = { ff75fc e8???????? 59 8a45fb c9 c3 55 }
            // n = 7, score = 400
            //   ff75fc               | push                dword ptr [ebp - 4]
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   8a45fb               | mov                 al, byte ptr [ebp - 5]
            //   c9                   | leave               
            //   c3                   | ret                 
            //   55                   | push                ebp

        $sequence_4 = { 8365f800 8d45f8 50 6a00 ff7508 a1???????? ffb030010000 }
            // n = 7, score = 400
            //   8365f800             | and                 dword ptr [ebp - 8], 0
            //   8d45f8               | lea                 eax, [ebp - 8]
            //   50                   | push                eax
            //   6a00                 | push                0
            //   ff7508               | push                dword ptr [ebp + 8]
            //   a1????????           |                     
            //   ffb030010000         | push                dword ptr [eax + 0x130]

        $sequence_5 = { 034878 894de0 8b45e0 8b4df8 034820 894de8 8b45e0 }
            // n = 7, score = 400
            //   034878               | add                 ecx, dword ptr [eax + 0x78]
            //   894de0               | mov                 dword ptr [ebp - 0x20], ecx
            //   8b45e0               | mov                 eax, dword ptr [ebp - 0x20]
            //   8b4df8               | mov                 ecx, dword ptr [ebp - 8]
            //   034820               | add                 ecx, dword ptr [eax + 0x20]
            //   894de8               | mov                 dword ptr [ebp - 0x18], ecx
            //   8b45e0               | mov                 eax, dword ptr [ebp - 0x20]

        $sequence_6 = { c9 c3 55 8bec 83ec0c 6804010000 }
            // n = 6, score = 400
            //   c9                   | leave               
            //   c3                   | ret                 
            //   55                   | push                ebp
            //   8bec                 | mov                 ebp, esp
            //   83ec0c               | sub                 esp, 0xc
            //   6804010000           | push                0x104

        $sequence_7 = { 894dfc 83a594feffff00 eb0d 8b8594feffff 40 898594feffff }
            // n = 6, score = 400
            //   894dfc               | mov                 dword ptr [ebp - 4], ecx
            //   83a594feffff00       | and                 dword ptr [ebp - 0x16c], 0
            //   eb0d                 | jmp                 0xf
            //   8b8594feffff         | mov                 eax, dword ptr [ebp - 0x16c]
            //   40                   | inc                 eax
            //   898594feffff         | mov                 dword ptr [ebp - 0x16c], eax

        $sequence_8 = { 837df400 7507 32c0 e9???????? 8b45f0 }
            // n = 5, score = 400
            //   837df400             | cmp                 dword ptr [ebp - 0xc], 0
            //   7507                 | jne                 9
            //   32c0                 | xor                 al, al
            //   e9????????           |                     
            //   8b45f0               | mov                 eax, dword ptr [ebp - 0x10]

        $sequence_9 = { c9 c3 55 8bec 83ec14 c645fb00 a1???????? }
            // n = 7, score = 400
            //   c9                   | leave               
            //   c3                   | ret                 
            //   55                   | push                ebp
            //   8bec                 | mov                 ebp, esp
            //   83ec14               | sub                 esp, 0x14
            //   c645fb00             | mov                 byte ptr [ebp - 5], 0
            //   a1????????           |                     

    condition:
        7 of them and filesize < 188416
}
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