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win.citadel (Back to overview)

Citadel

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References
2016-02-19XyliBoxXylitol
@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
2016-02-16JPCERT/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
2012-11-05MalwarebytesJérôme 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 (20200817 | autogenerated rule brought to you by yara-signator)
rule win_citadel_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.citadel"
        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 = { eb0e 6800800000 53 57 56 ff15???????? }
            // n = 6, score = 4900
            //   eb0e                 | jmp                 0x10
            //   6800800000           | push                0x8000
            //   53                   | push                ebx
            //   57                   | push                edi
            //   56                   | push                esi
            //   ff15????????         |                     

        $sequence_1 = { 663918 7507 41 66395802 7405 83c002 }
            // n = 6, score = 4800
            //   663918               | cmp                 word ptr [eax], bx
            //   7507                 | jne                 9
            //   41                   | inc                 ecx
            //   66395802             | cmp                 word ptr [eax + 2], bx
            //   7405                 | je                  7
            //   83c002               | add                 eax, 2

        $sequence_2 = { a802 0f84d2000000 8b450c 83651000 8365fc00 03c8 03f8 }
            // n = 7, score = 4800
            //   a802                 | test                al, 2
            //   0f84d2000000         | je                  0xd8
            //   8b450c               | mov                 eax, dword ptr [ebp + 0xc]
            //   83651000             | and                 dword ptr [ebp + 0x10], 0
            //   8365fc00             | and                 dword ptr [ebp - 4], 0
            //   03c8                 | add                 ecx, eax
            //   03f8                 | add                 edi, eax

        $sequence_3 = { 5f 5e c20400 55 8bec 8b4d0c 53 }
            // n = 7, score = 4800
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi
            //   c20400               | ret                 4
            //   55                   | push                ebp
            //   8bec                 | mov                 ebp, esp
            //   8b4d0c               | mov                 ecx, dword ptr [ebp + 0xc]
            //   53                   | push                ebx

        $sequence_4 = { 8b4c2414 53 c644241300 e8???????? 84c0 }
            // n = 5, score = 4800
            //   8b4c2414             | mov                 ecx, dword ptr [esp + 0x14]
            //   53                   | push                ebx
            //   c644241300           | mov                 byte ptr [esp + 0x13], 0
            //   e8????????           |                     
            //   84c0                 | test                al, al

        $sequence_5 = { e8???????? 8d7c0201 8bc7 e8???????? 8b1d???????? 8bf0 }
            // n = 6, score = 4800
            //   e8????????           |                     
            //   8d7c0201             | lea                 edi, [edx + eax + 1]
            //   8bc7                 | mov                 eax, edi
            //   e8????????           |                     
            //   8b1d????????         |                     
            //   8bf0                 | mov                 esi, eax

        $sequence_6 = { 8b4508 6a03 e8???????? 894508 85c0 75d2 8d041f }
            // n = 7, score = 4800
            //   8b4508               | mov                 eax, dword ptr [ebp + 8]
            //   6a03                 | push                3
            //   e8????????           |                     
            //   894508               | mov                 dword ptr [ebp + 8], eax
            //   85c0                 | test                eax, eax
            //   75d2                 | jne                 0xffffffd4
            //   8d041f               | lea                 eax, [edi + ebx]

        $sequence_7 = { 8bc6 e8???????? 84c0 7511 6a02 8bc6 e8???????? }
            // n = 7, score = 4800
            //   8bc6                 | mov                 eax, esi
            //   e8????????           |                     
            //   84c0                 | test                al, al
            //   7511                 | jne                 0x13
            //   6a02                 | push                2
            //   8bc6                 | mov                 eax, esi
            //   e8????????           |                     

        $sequence_8 = { 5d ff25???????? 55 8bec ff7508 e8???????? e8???????? }
            // n = 7, score = 4800
            //   5d                   | pop                 ebp
            //   ff25????????         |                     
            //   55                   | push                ebp
            //   8bec                 | mov                 ebp, esp
            //   ff7508               | push                dword ptr [ebp + 8]
            //   e8????????           |                     
            //   e8????????           |                     

        $sequence_9 = { 895c241c 85db 750c 56 }
            // n = 4, score = 4800
            //   895c241c             | mov                 dword ptr [esp + 0x1c], ebx
            //   85db                 | test                ebx, ebx
            //   750c                 | jne                 0xe
            //   56                   | push                esi

        $sequence_10 = { 50 e8???????? 6a44 5a }
            // n = 4, score = 4800
            //   50                   | push                eax
            //   e8????????           |                     
            //   6a44                 | push                0x44
            //   5a                   | pop                 edx

        $sequence_11 = { 53 8d8c0800fcffff 56 57 }
            // n = 4, score = 4800
            //   53                   | push                ebx
            //   8d8c0800fcffff       | lea                 ecx, [eax + ecx - 0x400]
            //   56                   | push                esi
            //   57                   | push                edi

        $sequence_12 = { 57 8bc6 50 57 ff15???????? 85c0 }
            // n = 6, score = 4800
            //   57                   | push                edi
            //   8bc6                 | mov                 eax, esi
            //   50                   | push                eax
            //   57                   | push                edi
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax

        $sequence_13 = { ff750c e8???????? 8845ff e8???????? 8a45ff 5f }
            // n = 6, score = 4800
            //   ff750c               | push                dword ptr [ebp + 0xc]
            //   e8????????           |                     
            //   8845ff               | mov                 byte ptr [ebp - 1], al
            //   e8????????           |                     
            //   8a45ff               | mov                 al, byte ptr [ebp - 1]
            //   5f                   | pop                 edi

        $sequence_14 = { e8???????? 85c0 7e45 51 6a00 }
            // n = 5, score = 4800
            //   e8????????           |                     
            //   85c0                 | test                eax, eax
            //   7e45                 | jle                 0x47
            //   51                   | push                ecx
            //   6a00                 | push                0

    condition:
        7 of them and filesize < 1236992
}
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