SYMBOLCOMMON_NAMEaka. SYNONYMS
win.jaku (Back to overview)

Jaku

aka: C3PRO-RACOON, EQUINOX, KCNA Infostealer, Reconcyc

Actor(s): DarkHotel


There is no description at this point.

References
2022-05-05BrightTALK (Mandiant)Christopher Gardner
@online{gardner:20220505:sample:66178f9, author = {Christopher Gardner}, title = {{The Sample: Beating the Malware Piñata}}, date = {2022-05-05}, organization = {BrightTALK (Mandiant)}, url = {https://www.brighttalk.com/webcast/7451/538775}, language = {English}, urldate = {2022-06-09} } The Sample: Beating the Malware Piñata
Jaku
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 (20220808 | Detects win.jaku.)
rule win_jaku_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-08-05"
        version = "1"
        description = "Detects win.jaku."
        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.jaku"
        malpedia_rule_date = "20220805"
        malpedia_hash = "6ec06c64bcfdbeda64eff021c766b4ce34542b71"
        malpedia_version = "20220808"
        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 = { 6609beb8160000 8b7e08 8a9eb8160000 881c39 ff4614 }
            // n = 5, score = 1500
            //   6609beb8160000       | or                  word ptr [esi + 0x16b8], di
            //   8b7e08               | mov                 edi, dword ptr [esi + 8]
            //   8a9eb8160000         | mov                 bl, byte ptr [esi + 0x16b8]
            //   881c39               | mov                 byte ptr [ecx + edi], bl
            //   ff4614               | inc                 dword ptr [esi + 0x14]

        $sequence_1 = { 7520 f6c140 0f85c6010000 6a01 5a d3e2 0fb74df2 }
            // n = 7, score = 1500
            //   7520                 | jne                 0x22
            //   f6c140               | test                cl, 0x40
            //   0f85c6010000         | jne                 0x1cc
            //   6a01                 | push                1
            //   5a                   | pop                 edx
            //   d3e2                 | shl                 edx, cl
            //   0fb74df2             | movzx               ecx, word ptr [ebp - 0xe]

        $sequence_2 = { 57 0f840d120000 8b701c 3bf2 }
            // n = 4, score = 1500
            //   57                   | push                edi
            //   0f840d120000         | je                  0x1213
            //   8b701c               | mov                 esi, dword ptr [eax + 0x1c]
            //   3bf2                 | cmp                 esi, edx

        $sequence_3 = { 6685c9 741b 0fb7c1 8b4d1c 0fb7444588 66893441 }
            // n = 6, score = 1500
            //   6685c9               | test                cx, cx
            //   741b                 | je                  0x1d
            //   0fb7c1               | movzx               eax, cx
            //   8b4d1c               | mov                 ecx, dword ptr [ebp + 0x1c]
            //   0fb7444588           | movzx               eax, word ptr [ebp + eax*2 - 0x78]
            //   66893441             | mov                 word ptr [ecx + eax*2], si

        $sequence_4 = { 0f8305020000 8b4d1c 894d1c 8acb 2a4dfc 884d11 }
            // n = 6, score = 1500
            //   0f8305020000         | jae                 0x20b
            //   8b4d1c               | mov                 ecx, dword ptr [ebp + 0x1c]
            //   894d1c               | mov                 dword ptr [ebp + 0x1c], ecx
            //   8acb                 | mov                 cl, bl
            //   2a4dfc               | sub                 cl, byte ptr [ebp - 4]
            //   884d11               | mov                 byte ptr [ebp + 0x11], cl

        $sequence_5 = { 56 8b7510 57 6a08 33c0 59 }
            // n = 6, score = 1500
            //   56                   | push                esi
            //   8b7510               | mov                 esi, dword ptr [ebp + 0x10]
            //   57                   | push                edi
            //   6a08                 | push                8
            //   33c0                 | xor                 eax, eax
            //   59                   | pop                 ecx

        $sequence_6 = { 85d2 0f85760c0000 eb0b 8b4620 85c0 7404 83601c00 }
            // n = 7, score = 1500
            //   85d2                 | test                edx, edx
            //   0f85760c0000         | jne                 0xc7c
            //   eb0b                 | jmp                 0xd
            //   8b4620               | mov                 eax, dword ptr [esi + 0x20]
            //   85c0                 | test                eax, eax
            //   7404                 | je                  6
            //   83601c00             | and                 dword ptr [eax + 0x1c], 0

        $sequence_7 = { 668b566c 33db 66891441 ff4e78 75b6 ff466c 8b466c }
            // n = 7, score = 1500
            //   668b566c             | mov                 dx, word ptr [esi + 0x6c]
            //   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]

        $sequence_8 = { 68???????? ff15???????? c3 b8???????? e8???????? 83ec2c }
            // n = 6, score = 800
            //   68????????           |                     
            //   ff15????????         |                     
            //   c3                   | ret                 
            //   b8????????           |                     
            //   e8????????           |                     
            //   83ec2c               | sub                 esp, 0x2c

        $sequence_9 = { ff742408 e8???????? c20800 8bc1 }
            // n = 4, score = 600
            //   ff742408             | push                dword ptr [esp + 8]
            //   e8????????           |                     
            //   c20800               | ret                 8
            //   8bc1                 | mov                 eax, ecx

        $sequence_10 = { 53 68000000a0 6a03 53 }
            // n = 4, score = 500
            //   53                   | push                ebx
            //   68000000a0           | push                0xa0000000
            //   6a03                 | push                3
            //   53                   | push                ebx

        $sequence_11 = { 7508 83c8ff e9???????? 8b839f830000 }
            // n = 4, score = 500
            //   7508                 | jne                 0xa
            //   83c8ff               | or                  eax, 0xffffffff
            //   e9????????           |                     
            //   8b839f830000         | mov                 eax, dword ptr [ebx + 0x839f]

        $sequence_12 = { 5b c3 55 8bec 833d????????00 53 56 }
            // n = 7, score = 500
            //   5b                   | pop                 ebx
            //   c3                   | ret                 
            //   55                   | push                ebp
            //   8bec                 | mov                 ebp, esp
            //   833d????????00       |                     
            //   53                   | push                ebx
            //   56                   | push                esi

        $sequence_13 = { 7507 b800308000 eb02 33c0 }
            // n = 4, score = 500
            //   7507                 | jne                 9
            //   b800308000           | mov                 eax, 0x803000
            //   eb02                 | jmp                 4
            //   33c0                 | xor                 eax, eax

        $sequence_14 = { 55 56 57 6880020000 }
            // n = 4, score = 500
            //   55                   | push                ebp
            //   56                   | push                esi
            //   57                   | push                edi
            //   6880020000           | push                0x280

        $sequence_15 = { 75dd 57 e8???????? 59 }
            // n = 4, score = 500
            //   75dd                 | jne                 0xffffffdf
            //   57                   | push                edi
            //   e8????????           |                     
            //   59                   | pop                 ecx

        $sequence_16 = { 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_17 = { 50 e8???????? 59 8b4e2c }
            // n = 4, score = 400
            //   50                   | push                eax
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   8b4e2c               | mov                 ecx, dword ptr [esi + 0x2c]

        $sequence_18 = { e8???????? 59 eb57 53 }
            // n = 4, score = 400
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   eb57                 | jmp                 0x59
            //   53                   | push                ebx

        $sequence_19 = { 56 e8???????? 59 8b4620 }
            // n = 4, score = 400
            //   56                   | push                esi
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   8b4620               | mov                 eax, dword ptr [esi + 0x20]

        $sequence_20 = { 0245fd 3245fe 8a4dff d2c8 }
            // n = 4, score = 400
            //   0245fd               | add                 al, byte ptr [ebp - 3]
            //   3245fe               | xor                 al, byte ptr [ebp - 2]
            //   8a4dff               | mov                 cl, byte ptr [ebp - 1]
            //   d2c8                 | ror                 al, cl

        $sequence_21 = { 85ed 8bf5 746e 8dbed8010000 }
            // n = 4, score = 400
            //   85ed                 | test                ebp, ebp
            //   8bf5                 | mov                 esi, ebp
            //   746e                 | je                  0x70
            //   8dbed8010000         | lea                 edi, [esi + 0x1d8]

        $sequence_22 = { 016c242c 8b44242c 5f 5e 5d }
            // n = 5, score = 400
            //   016c242c             | add                 dword ptr [esp + 0x2c], ebp
            //   8b44242c             | mov                 eax, dword ptr [esp + 0x2c]
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi
            //   5d                   | pop                 ebp

        $sequence_23 = { 8b4dec 2bc8 8d5c0bff 40 8945ec }
            // n = 5, score = 300
            //   8b4dec               | mov                 ecx, dword ptr [ebp - 0x14]
            //   2bc8                 | sub                 ecx, eax
            //   8d5c0bff             | lea                 ebx, [ebx + ecx - 1]
            //   40                   | inc                 eax
            //   8945ec               | mov                 dword ptr [ebp - 0x14], eax

        $sequence_24 = { 33c9 66898875830000 889877830000 66898878830000 }
            // n = 4, score = 300
            //   33c9                 | xor                 ecx, ecx
            //   66898875830000       | mov                 word ptr [eax + 0x8375], cx
            //   889877830000         | mov                 byte ptr [eax + 0x8377], bl
            //   66898878830000       | mov                 word ptr [eax + 0x8378], cx

        $sequence_25 = { 8b4508 895dcc 895d28 7303 }
            // n = 4, score = 300
            //   8b4508               | mov                 eax, dword ptr [ebp + 8]
            //   895dcc               | mov                 dword ptr [ebp - 0x34], ebx
            //   895d28               | mov                 dword ptr [ebp + 0x28], ebx
            //   7303                 | jae                 5

        $sequence_26 = { 66398731770000 7505 e8???????? 0fbf4508 }
            // n = 4, score = 300
            //   66398731770000       | cmp                 word ptr [edi + 0x7731], ax
            //   7505                 | jne                 7
            //   e8????????           |                     
            //   0fbf4508             | movsx               eax, word ptr [ebp + 8]

        $sequence_27 = { 6a00 56 53 8b03 ff502c }
            // n = 5, score = 200
            //   6a00                 | push                0
            //   56                   | push                esi
            //   53                   | push                ebx
            //   8b03                 | mov                 eax, dword ptr [ebx]
            //   ff502c               | call                dword ptr [eax + 0x2c]

        $sequence_28 = { 59 ff431c 66c743107c02 833d????????00 }
            // n = 4, score = 200
            //   59                   | pop                 ecx
            //   ff431c               | inc                 dword ptr [ebx + 0x1c]
            //   66c743107c02         | mov                 word ptr [ebx + 0x10], 0x27c
            //   833d????????00       |                     

    condition:
        7 of them and filesize < 2220032
}
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