SYMBOLCOMMON_NAMEaka. SYNONYMS
win.jaku (Back to overview)

Jaku

aka: Reconcyc, KCNA Infostealer, C3PRO-RACOON

There is no description at this point.

References
2018-06-17IBMIBM Support
@online{support:20180617:storwize:8759428, author = {IBM Support}, title = {{Storwize USB Initialization Tool may contain malicious code}}, date = {2018-06-17}, organization = {IBM}, url = {https://www-01.ibm.com/support/docview.wss?uid=ssg1S1010146}, language = {English}, urldate = {2020-01-07} } Storwize USB Initialization Tool may contain malicious code
Jaku
2016ForcepointAndy Settle, Bapadittya Dey, Nicholas Griffin, Abel Toro
@techreport{settle:2016:analysis:8117245, author = {Andy Settle and Bapadittya Dey and Nicholas Griffin and Abel Toro}, title = {{Analysis of a Botnet Campaign}}, date = {2016}, institution = {Forcepoint}, url = {https://www.forcepoint.com/sites/default/files/resources/files/report_jaku_analysis_of_botnet_campaign_en_0.pdf}, language = {English}, urldate = {2020-01-06} } Analysis of a Botnet Campaign
Jaku
2015-03-04Kaspersky LabsKurt Baumgartner, Juan Andrés Guerrero-Saade
@online{baumgartner:20150304:whos:0b8331c, author = {Kurt Baumgartner and Juan Andrés Guerrero-Saade}, title = {{Who’s Really Spreading through the Bright Star?}}, date = {2015-03-04}, organization = {Kaspersky Labs}, url = {https://securelist.com/whos-really-spreading-through-the-bright-star/68978/}, language = {English}, urldate = {2019-12-20} } Who’s Really Spreading through the Bright Star?
Jaku
Yara Rules
[TLP:WHITE] win_jaku_auto (20201023 | autogenerated rule brought to you by yara-signator)
rule win_jaku_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.jaku"
        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 = { 33db 33ff 895df4 8b4620 85c0 }
            // n = 5, score = 1500
            //   33db                 | xor                 ebx, ebx
            //   33ff                 | xor                 edi, edi
            //   895df4               | mov                 dword ptr [ebp - 0xc], ebx
            //   8b4620               | mov                 eax, dword ptr [esi + 0x20]
            //   85c0                 | test                eax, eax

        $sequence_1 = { 8945d4 894de0 8955dc 8b06 83f81e }
            // n = 5, score = 1500
            //   8945d4               | mov                 dword ptr [ebp - 0x2c], eax
            //   894de0               | mov                 dword ptr [ebp - 0x20], ecx
            //   8955dc               | mov                 dword ptr [ebp - 0x24], edx
            //   8b06                 | mov                 eax, dword ptr [esi]
            //   83f81e               | cmp                 eax, 0x1e

        $sequence_2 = { 85c0 75b2 8b45f4 8b4df8 }
            // n = 4, score = 1500
            //   85c0                 | test                eax, eax
            //   75b2                 | jne                 0xffffffb4
            //   8b45f4               | mov                 eax, dword ptr [ebp - 0xc]
            //   8b4df8               | mov                 ecx, dword ptr [ebp - 8]

        $sequence_3 = { 8d0c86 8b4510 2bfa 2bcb }
            // n = 4, score = 1500
            //   8d0c86               | lea                 ecx, [esi + eax*4]
            //   8b4510               | mov                 eax, dword ptr [ebp + 0x10]
            //   2bfa                 | sub                 edi, edx
            //   2bcb                 | sub                 ecx, ebx

        $sequence_4 = { 89484c 89b0c01b0000 33c0 5e }
            // n = 4, score = 1500
            //   89484c               | mov                 dword ptr [eax + 0x4c], ecx
            //   89b0c01b0000         | mov                 dword ptr [eax + 0x1bc0], esi
            //   33c0                 | xor                 eax, eax
            //   5e                   | pop                 esi

        $sequence_5 = { 3bc3 7408 83c8ff e9???????? 6689758a 33c9 }
            // n = 6, score = 1500
            //   3bc3                 | cmp                 eax, ebx
            //   7408                 | je                  0xa
            //   83c8ff               | or                  eax, 0xffffffff
            //   e9????????           |                     
            //   6689758a             | mov                 word ptr [ebp - 0x76], si
            //   33c9                 | xor                 ecx, ecx

        $sequence_6 = { 894648 8b4648 85c0 743c 3bf8 7321 837df800 }
            // n = 7, score = 1500
            //   894648               | mov                 dword ptr [esi + 0x48], eax
            //   8b4648               | mov                 eax, dword ptr [esi + 0x48]
            //   85c0                 | test                eax, eax
            //   743c                 | je                  0x3e
            //   3bf8                 | cmp                 edi, eax
            //   7321                 | jae                 0x23
            //   837df800             | cmp                 dword ptr [ebp - 8], 0

        $sequence_7 = { 33db 66891441 ff4e78 75b6 ff466c 8b466c 3beb }
            // n = 7, score = 1500
            //   33db                 | xor                 ebx, ebx
            //   66891441             | mov                 word ptr [ecx + eax*2], dx
            //   ff4e78               | dec                 dword ptr [esi + 0x78]
            //   75b6                 | jne                 0xffffffb8
            //   ff466c               | inc                 dword ptr [esi + 0x6c]
            //   8b466c               | mov                 eax, dword ptr [esi + 0x6c]
            //   3beb                 | cmp                 ebp, ebx

        $sequence_8 = { ff15???????? c3 b8???????? e8???????? 83ec2c }
            // n = 5, score = 700
            //   ff15????????         |                     
            //   c3                   | ret                 
            //   b8????????           |                     
            //   e8????????           |                     
            //   83ec2c               | sub                 esp, 0x2c

        $sequence_9 = { 7508 83c8ff e9???????? 8b839f830000 }
            // n = 4, score = 500
            //   7508                 | jne                 0xa
            //   83c8ff               | or                  eax, 0xffffffff
            //   e9????????           |                     
            //   8b839f830000         | mov                 eax, dword ptr [ebx + 0x839f]

        $sequence_10 = { 6a01 03c3 68???????? 50 e8???????? 83c40c 85c0 }
            // n = 7, score = 500
            //   6a01                 | push                1
            //   03c3                 | add                 eax, ebx
            //   68????????           |                     
            //   50                   | push                eax
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc
            //   85c0                 | test                eax, eax

        $sequence_11 = { ff742408 e8???????? c20800 8bc1 }
            // n = 4, score = 500
            //   ff742408             | push                dword ptr [esp + 8]
            //   e8????????           |                     
            //   c20800               | ret                 8
            //   8bc1                 | mov                 eax, ecx

        $sequence_12 = { 8b400c 8b00 8b00 8b4018 8945fc 8b45fc }
            // n = 6, score = 500
            //   8b400c               | mov                 eax, dword ptr [eax + 0xc]
            //   8b00                 | mov                 eax, dword ptr [eax]
            //   8b00                 | mov                 eax, dword ptr [eax]
            //   8b4018               | mov                 eax, dword ptr [eax + 0x18]
            //   8945fc               | mov                 dword ptr [ebp - 4], eax
            //   8b45fc               | mov                 eax, dword ptr [ebp - 4]

        $sequence_13 = { 75dd 57 e8???????? 59 }
            // n = 4, score = 500
            //   75dd                 | jne                 0xffffffdf
            //   57                   | push                edi
            //   e8????????           |                     
            //   59                   | pop                 ecx

        $sequence_14 = { 7507 b800308000 eb02 33c0 }
            // n = 4, score = 500
            //   7507                 | jne                 9
            //   b800308000           | mov                 eax, 0x803000
            //   eb02                 | jmp                 4
            //   33c0                 | xor                 eax, eax

        $sequence_15 = { 56 e8???????? 59 8b4624 }
            // n = 4, score = 400
            //   56                   | push                esi
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   8b4624               | mov                 eax, dword ptr [esi + 0x24]

        $sequence_16 = { 50 e8???????? 59 8b4e2c }
            // n = 4, score = 400
            //   50                   | push                eax
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   8b4e2c               | mov                 ecx, dword ptr [esi + 0x2c]

        $sequence_17 = { 53 68000000a0 6a03 53 }
            // n = 4, score = 400
            //   53                   | push                ebx
            //   68000000a0           | push                0xa0000000
            //   6a03                 | push                3
            //   53                   | push                ebx

        $sequence_18 = { 55 56 57 6880020000 }
            // n = 4, score = 400
            //   55                   | push                ebp
            //   56                   | push                esi
            //   57                   | push                edi
            //   6880020000           | push                0x280

        $sequence_19 = { 5e 5b c3 55 8bec 833d????????00 53 }
            // n = 7, score = 400
            //   5e                   | pop                 esi
            //   5b                   | pop                 ebx
            //   c3                   | ret                 
            //   55                   | push                ebp
            //   8bec                 | mov                 ebp, esp
            //   833d????????00       |                     
            //   53                   | push                ebx

        $sequence_20 = { e8???????? 59 eb57 53 }
            // n = 4, score = 400
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   eb57                 | jmp                 0x59
            //   53                   | push                ebx

        $sequence_21 = { 3bc3 89aed0000000 7407 8bce }
            // n = 4, score = 300
            //   3bc3                 | cmp                 eax, ebx
            //   89aed0000000         | mov                 dword ptr [esi + 0xd0], ebp
            //   7407                 | je                  9
            //   8bce                 | mov                 ecx, esi

        $sequence_22 = { 56 be01010000 56 8d85f4feffff 53 }
            // n = 5, score = 300
            //   56                   | push                esi
            //   be01010000           | mov                 esi, 0x101
            //   56                   | push                esi
            //   8d85f4feffff         | lea                 eax, [ebp - 0x10c]
            //   53                   | push                ebx

        $sequence_23 = { 68???????? 57 83c614 e8???????? 53 }
            // n = 5, score = 300
            //   68????????           |                     
            //   57                   | push                edi
            //   83c614               | add                 esi, 0x14
            //   e8????????           |                     
            //   53                   | push                ebx

        $sequence_24 = { 8b44242c 8d54241c 51 52 50 }
            // n = 5, score = 300
            //   8b44242c             | mov                 eax, dword ptr [esp + 0x2c]
            //   8d54241c             | lea                 edx, [esp + 0x1c]
            //   51                   | push                ecx
            //   52                   | push                edx
            //   50                   | push                eax

        $sequence_25 = { 7303 8d45d0 56 68???????? 6a01 56 50 }
            // n = 7, score = 300
            //   7303                 | jae                 5
            //   8d45d0               | lea                 eax, [ebp - 0x30]
            //   56                   | push                esi
            //   68????????           |                     
            //   6a01                 | push                1
            //   56                   | push                esi
            //   50                   | push                eax

        $sequence_26 = { 89742428 8bcf 0faffa 0fafc8 8b93e2010000 8b742430 }
            // n = 6, score = 300
            //   89742428             | mov                 dword ptr [esp + 0x28], esi
            //   8bcf                 | mov                 ecx, edi
            //   0faffa               | imul                edi, edx
            //   0fafc8               | imul                ecx, eax
            //   8b93e2010000         | mov                 edx, dword ptr [ebx + 0x1e2]
            //   8b742430             | mov                 esi, dword ptr [esp + 0x30]

        $sequence_27 = { 51 8b4508 50 8b10 ff5204 83c41c 8b4ddc }
            // n = 7, score = 200
            //   51                   | push                ecx
            //   8b4508               | mov                 eax, dword ptr [ebp + 8]
            //   50                   | push                eax
            //   8b10                 | mov                 edx, dword ptr [eax]
            //   ff5204               | call                dword ptr [edx + 4]
            //   83c41c               | add                 esp, 0x1c
            //   8b4ddc               | mov                 ecx, dword ptr [ebp - 0x24]

    condition:
        7 of them and filesize < 2220032
}
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