win.citadel (Back to overview)

Citadel

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References
2016-02-19 ⋅ XyliBoxXylitol
@online{xylitol:20160219:citadel:93968a2, author = {Xylitol}, title = {{Citadel 0.0.1.1 (Atmos)}}, date = {2016-02-19}, organization = {XyliBox}, url = {http://www.xylibox.com/2016/02/citadel-0011-atmos.html}, language = {English}, urldate = {2020-01-09} } Citadel 0.0.1.1 (Atmos)
Citadel
2016-02-16 ⋅ JPCERT/CCJPCert
@online{jpcert:20160216:banking:43d5789, author = {JPCert}, title = {{Banking Trojan “Citadel” Returns}}, date = {2016-02-16}, organization = {JPCERT/CC}, url = {http://blog.jpcert.or.jp/2016/02/banking-trojan--27d6.html}, language = {English}, urldate = {2019-12-19} } Banking Trojan “Citadel” Returns
Citadel
2012-11-05 ⋅ MalwarebytesJérôme Segura
@online{segura:20121105:citadel:f1d7f7d, author = {Jérôme Segura}, title = {{Citadel: a cyber-criminal’s ultimate weapon?}}, date = {2012-11-05}, organization = {Malwarebytes}, url = {https://blog.malwarebytes.com/threat-analysis/2012/11/citadel-a-cyber-criminals-ultimate-weapon/}, language = {English}, urldate = {2019-12-20} } Citadel: a cyber-criminal’s ultimate weapon?
Citadel
Yara Rules
[TLP:WHITE] win_citadel_auto (20190204 | autogenerated rule brought to you by yara-signator)
rule win_citadel_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2019-11-26"
        version = "1"
        description = "autogenerated rule brought to you by yara-signator"
        tool = "yara-signator 0.1a"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.citadel"
        malpedia_version = "20190204"
        malpedia_license = "CC BY-NC-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 will be published in the near future 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 = { 7409 ff742434 e8???????? c644241301 80fb01 }
            // n = 5, score = 2500
            //   7409                 | je                  0xb
            //   ff742434             | push                dword ptr [esp + 0x34]
            //   e8????????           |                     
            //   c644241301           | mov                 byte ptr [esp + 0x13], 1
            //   80fb01               | cmp                 bl, 1

        $sequence_1 = { 85ff 7441 837df400 749f 8b5df8 85db 743c }
            // n = 7, score = 2500
            //   85ff                 | test                edi, edi
            //   7441                 | je                  0x43
            //   837df400             | cmp                 dword ptr [ebp - 0xc], 0
            //   749f                 | je                  0xffffffa1
            //   8b5df8               | mov                 ebx, dword ptr [ebp - 8]
            //   85db                 | test                ebx, ebx
            //   743c                 | je                  0x3e

        $sequence_2 = { 53 56 57 8b7d08 be08020000 56 8d85ecfdffff }
            // n = 7, score = 2500
            //   53                   | push                ebx
            //   56                   | push                esi
            //   57                   | push                edi
            //   8b7d08               | mov                 edi, dword ptr [ebp + 8]
            //   be08020000           | mov                 esi, 0x208
            //   56                   | push                esi
            //   8d85ecfdffff         | lea                 eax, [ebp - 0x214]

        $sequence_3 = { 744b 33d2 8bcb e8???????? 8bf0 e8???????? 85f6 }
            // n = 7, score = 2500
            //   744b                 | je                  0x4d
            //   33d2                 | xor                 edx, edx
            //   8bcb                 | mov                 ecx, ebx
            //   e8????????           |                     
            //   8bf0                 | mov                 esi, eax
            //   e8????????           |                     
            //   85f6                 | test                esi, esi

        $sequence_4 = { 66837f0802 752b 8b470c 53 33db 3930 }
            // n = 6, score = 2500
            //   66837f0802           | cmp                 word ptr [edi + 8], 2
            //   752b                 | jne                 0x2d
            //   8b470c               | mov                 eax, dword ptr [edi + 0xc]
            //   53                   | push                ebx
            //   33db                 | xor                 ebx, ebx
            //   3930                 | cmp                 dword ptr [eax], esi

        $sequence_5 = { 84c0 7453 6a10 8d460c 8d4dec }
            // n = 5, score = 2500
            //   84c0                 | test                al, al
            //   7453                 | je                  0x55
            //   6a10                 | push                0x10
            //   8d460c               | lea                 eax, [esi + 0xc]
            //   8d4dec               | lea                 ecx, [ebp - 0x14]

        $sequence_6 = { 53 57 e8???????? 8b4d10 8901 8b4514 85c0 }
            // n = 7, score = 2500
            //   53                   | push                ebx
            //   57                   | push                edi
            //   e8????????           |                     
            //   8b4d10               | mov                 ecx, dword ptr [ebp + 0x10]
            //   8901                 | mov                 dword ptr [ecx], eax
            //   8b4514               | mov                 eax, dword ptr [ebp + 0x14]
            //   85c0                 | test                eax, eax

        $sequence_7 = { 8d8c0180000000 57 8b39 8955f0 8945fc 85ff }
            // n = 6, score = 2500
            //   8d8c0180000000       | lea                 ecx, [ecx + eax + 0x80]
            //   57                   | push                edi
            //   8b39                 | mov                 edi, dword ptr [ecx]
            //   8955f0               | mov                 dword ptr [ebp - 0x10], edx
            //   8945fc               | mov                 dword ptr [ebp - 4], eax
            //   85ff                 | test                edi, edi

        $sequence_8 = { fec0 7514 43 ebe2 ff15???????? 2b442414 3d10270000 }
            // n = 7, score = 2500
            //   fec0                 | inc                 al
            //   7514                 | jne                 0x16
            //   43                   | inc                 ebx
            //   ebe2                 | jmp                 0xffffffe4
            //   ff15????????         |                     
            //   2b442414             | sub                 eax, dword ptr [esp + 0x14]
            //   3d10270000           | cmp                 eax, 0x2710

        $sequence_9 = { e8???????? 3bc3 741b 50 8d85e4fbffff e8???????? 85c0 }
            // n = 7, score = 2500
            //   e8????????           |                     
            //   3bc3                 | cmp                 eax, ebx
            //   741b                 | je                  0x1d
            //   50                   | push                eax
            //   8d85e4fbffff         | lea                 eax, [ebp - 0x41c]
            //   e8????????           |                     
            //   85c0                 | test                eax, eax

    condition:
        7 of them
}
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