SYMBOLCOMMON_NAMEaka. SYNONYMS
win.krbanker (Back to overview)

KrBanker

aka: BlackMoon

ThreatPost describes KRBanker (Blackmoon) as a banking Trojan designed to steal user credentials from various South Korean banking institutions. It was discovered in early 2014 and since then has adopted a variety of infection and credential stealing techniques.

References
2019-03-18Pepper Potts
@online{potts:20190318:analysis:74d47aa, author = {Pepper Potts}, title = {{Analysis of BlackMoon (Banking Trojan)'s Evolution, And The Possibility of a Latest Version Under Development}}, date = {2019-03-18}, url = {https://www.peppermalware.com/2019/03/analysis-of-blackmoon-banking-trojans.html}, language = {English}, urldate = {2019-11-28} } Analysis of BlackMoon (Banking Trojan)'s Evolution, And The Possibility of a Latest Version Under Development
KrBanker
2017-05-04Fidelis CybersecurityJason Reaves
@online{reaves:20170504:blackmoon:2615659, author = {Jason Reaves}, title = {{Blackmoon Rising: Banking Trojan Back with New Framework}}, date = {2017-05-04}, organization = {Fidelis Cybersecurity}, url = {https://fidelissecurity.com/threatgeek/threat-intelligence/blackmoon-banking-trojan-new-framework/}, language = {English}, urldate = {2023-04-25} } Blackmoon Rising: Banking Trojan Back with New Framework
KrBanker
2016-05-09Palo Alto Networks Unit 42Kaoru Hayashi, Vicky Ray
@online{hayashi:20160509:krbanker:c59923f, author = {Kaoru Hayashi and Vicky Ray}, title = {{KRBanker Targets South Korea Through Adware and Exploit Kits}}, date = {2016-05-09}, organization = {Palo Alto Networks Unit 42}, url = {http://researchcenter.paloaltonetworks.com/2016/05/unit42-krbanker-targets-south-korea-through-adware-and-exploit-kits-2/}, language = {English}, urldate = {2019-12-20} } KRBanker Targets South Korea Through Adware and Exploit Kits
KrBanker
2016-01-18ProofpointProofpoint Staff
@online{staff:20160118:updated:c96de1d, author = {Proofpoint Staff}, title = {{Updated Blackmoon banking Trojan stays focused on South Korean banking customers}}, date = {2016-01-18}, organization = {Proofpoint}, url = {https://www.proofpoint.com/us/threat-insight/post/Updated-Blackmoon-Banking-Trojan}, language = {English}, urldate = {2019-12-20} } Updated Blackmoon banking Trojan stays focused on South Korean banking customers
KrBanker
2014-04-15My infected computerZairon
@online{zairon:20140415:trojan:3951130, author = {Zairon}, title = {{Trojan banking}}, date = {2014-04-15}, organization = {My infected computer}, url = {https://zairon.wordpress.com/2014/04/15/trojan-banking-47d18761d46d8e7c4ad49cc575b0acc2bb3f49bb56a3d29fb1ec600447cb89a4/}, language = {English}, urldate = {2020-01-06} } Trojan banking
KrBanker
Yara Rules
[TLP:WHITE] win_krbanker_auto (20230407 | Detects win.krbanker.)
rule win_krbanker_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-03-28"
        version = "1"
        description = "Detects win.krbanker."
        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.krbanker"
        malpedia_rule_date = "20230328"
        malpedia_hash = "9d2d75cef573c1c2d861f5197df8f563b05a305d"
        malpedia_version = "20230407"
        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 = { 52 51 8b4c2410 57 6a01 }
            // n = 5, score = 400
            //   52                   | push                edx
            //   51                   | push                ecx
            //   8b4c2410             | mov                 ecx, dword ptr [esp + 0x10]
            //   57                   | push                edi
            //   6a01                 | push                1

        $sequence_1 = { 8945d4 6801010080 6a00 6874000000 6801000000 }
            // n = 5, score = 400
            //   8945d4               | mov                 dword ptr [ebp - 0x2c], eax
            //   6801010080           | push                0x80000101
            //   6a00                 | push                0
            //   6874000000           | push                0x74
            //   6801000000           | push                1

        $sequence_2 = { 85c9 7413 8b4030 33d2 85c0 }
            // n = 5, score = 400
            //   85c9                 | test                ecx, ecx
            //   7413                 | je                  0x15
            //   8b4030               | mov                 eax, dword ptr [eax + 0x30]
            //   33d2                 | xor                 edx, edx
            //   85c0                 | test                eax, eax

        $sequence_3 = { 8b44244c 03fd 2bdd 83f8ff 7419 48 8944244c }
            // n = 7, score = 400
            //   8b44244c             | mov                 eax, dword ptr [esp + 0x4c]
            //   03fd                 | add                 edi, ebp
            //   2bdd                 | sub                 ebx, ebp
            //   83f8ff               | cmp                 eax, -1
            //   7419                 | je                  0x1b
            //   48                   | dec                 eax
            //   8944244c             | mov                 dword ptr [esp + 0x4c], eax

        $sequence_4 = { 8bf8 8b44241c 83c404 8bf0 }
            // n = 4, score = 400
            //   8bf8                 | mov                 edi, eax
            //   8b44241c             | mov                 eax, dword ptr [esp + 0x1c]
            //   83c404               | add                 esp, 4
            //   8bf0                 | mov                 esi, eax

        $sequence_5 = { 8944244c 741e eb10 33c0 8d4c2424 8a07 50 }
            // n = 7, score = 400
            //   8944244c             | mov                 dword ptr [esp + 0x4c], eax
            //   741e                 | je                  0x20
            //   eb10                 | jmp                 0x12
            //   33c0                 | xor                 eax, eax
            //   8d4c2424             | lea                 ecx, [esp + 0x24]
            //   8a07                 | mov                 al, byte ptr [edi]
            //   50                   | push                eax

        $sequence_6 = { e8???????? 83c410 8945e4 6801010080 6a00 6841000000 }
            // n = 6, score = 400
            //   e8????????           |                     
            //   83c410               | add                 esp, 0x10
            //   8945e4               | mov                 dword ptr [ebp - 0x1c], eax
            //   6801010080           | push                0x80000101
            //   6a00                 | push                0
            //   6841000000           | push                0x41

        $sequence_7 = { 8d4c2424 e8???????? 85f6 c744244000000000 }
            // n = 4, score = 400
            //   8d4c2424             | lea                 ecx, [esp + 0x24]
            //   e8????????           |                     
            //   85f6                 | test                esi, esi
            //   c744244000000000     | mov                 dword ptr [esp + 0x40], 0

        $sequence_8 = { e8???????? 8945e0 8b5df8 e8???????? }
            // n = 4, score = 400
            //   e8????????           |                     
            //   8945e0               | mov                 dword ptr [ebp - 0x20], eax
            //   8b5df8               | mov                 ebx, dword ptr [ebp - 8]
            //   e8????????           |                     

        $sequence_9 = { e8???????? 83c404 d945e4 eb06 8955e8 dd45e4 }
            // n = 6, score = 400
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   d945e4               | fld                 dword ptr [ebp - 0x1c]
            //   eb06                 | jmp                 8
            //   8955e8               | mov                 dword ptr [ebp - 0x18], edx
            //   dd45e4               | fld                 qword ptr [ebp - 0x1c]

    condition:
        7 of them and filesize < 1826816
}
[TLP:WHITE] win_krbanker_w0   (20170410 | No description)
rule win_krbanker_w0 {
    meta:
        author = "Proofpoint Staff"
        info = "krbanker / blackmoon update"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.krbanker"
        malpedia_version = "20170410"
        malpedia_license = "CC BY-NC-SA 4.0"
        malpedia_sharing = "TLP:WHITE"
    strings:
            $s1 = "BlackMoon RunTime Error:" nocase wide ascii
            $s2 = "\\system32\\rundll32.exe" wide ascii
            $s3 = "cmd.exe /c ipconfig /flushdns" wide ascii
            $s4 = "\\system32\\drivers\\etc\\hosts.ics" wide ascii

    condition:
            all of them
}
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