SYMBOLCOMMON_NAMEaka. SYNONYMS
win.backswap (Back to overview)

BackSwap


There is no description at this point.

References
2018-11-30Check PointItay Cohen
@online{cohen:20181130:evolution:045e447, author = {Itay Cohen}, title = {{The Evolution of BackSwap}}, date = {2018-11-30}, organization = {Check Point}, url = {https://research.checkpoint.com/the-evolution-of-backswap/}, language = {English}, urldate = {2020-01-10} } The Evolution of BackSwap
BackSwap
2018-08-22IBMLimor Kessem
@online{kessem:20180822:backswap:73c04f5, author = {Limor Kessem}, title = {{BackSwap Malware Now Targets Six Banks in Spain}}, date = {2018-08-22}, organization = {IBM}, url = {https://securityintelligence.com/backswap-malware-now-targets-six-banks-in-spain/}, language = {English}, urldate = {2019-12-20} } BackSwap Malware Now Targets Six Banks in Spain
BackSwap
2018-08-06CyberbitHod Gavriel, Boris Erbesfeld
@online{gavriel:20180806:backswap:f13384a, author = {Hod Gavriel and Boris Erbesfeld}, title = {{BackSwap Banker Malware Hides Inside Replicas of Legitimate Programs}}, date = {2018-08-06}, organization = {Cyberbit}, url = {https://www.cyberbit.com/backswap-banker-malware-hides-inside-replicas-of-legitimate-programs/}, language = {English}, urldate = {2020-08-21} } BackSwap Banker Malware Hides Inside Replicas of Legitimate Programs
BackSwap
2018-06-29F5Ruby Cohen, Doron Voolf
@online{cohen:20180629:backswap:1605a3d, author = {Ruby Cohen and Doron Voolf}, title = {{BackSwap Defrauds Online Banking Customers Using Hidden Input Fields}}, date = {2018-06-29}, organization = {F5}, url = {https://www.f5.com/labs/articles/threat-intelligence/backswap-defrauds-online-banking-customers-using-hidden-input-fi}, language = {English}, urldate = {2020-01-10} } BackSwap Defrauds Online Banking Customers Using Hidden Input Fields
BackSwap
2018-06-19CERT.PLHubert Barc
@online{barc:20180619:backswap:f0869a4, author = {Hubert Barc}, title = {{Backswap malware analysis}}, date = {2018-06-19}, organization = {CERT.PL}, url = {https://www.cert.pl/en/news/single/backswap-malware-analysis/}, language = {English}, urldate = {2019-12-10} } Backswap malware analysis
BackSwap
2018-05-25ESET ResearchMichal Poslušný
@online{poslun:20180525:backswap:709ad89, author = {Michal Poslušný}, title = {{BackSwap malware finds innovative ways to empty bank accounts}}, date = {2018-05-25}, organization = {ESET Research}, url = {https://www.welivesecurity.com/2018/05/25/backswap-malware-empty-bank-accounts/}, language = {English}, urldate = {2019-11-14} } BackSwap malware finds innovative ways to empty bank accounts
BackSwap
Yara Rules
[TLP:WHITE] win_backswap_auto (20200817 | autogenerated rule brought to you by yara-signator)
rule win_backswap_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.backswap"
        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 = { 8bce 8bd3 397d14 0f8e99000000 39750c 7e7b 46 }
            // n = 7, score = 400
            //   8bce                 | mov                 ecx, esi
            //   8bd3                 | mov                 edx, ebx
            //   397d14               | cmp                 dword ptr [ebp + 0x14], edi
            //   0f8e99000000         | jle                 0x9f
            //   39750c               | cmp                 dword ptr [ebp + 0xc], esi
            //   7e7b                 | jle                 0x7d
            //   46                   | inc                 esi

        $sequence_1 = { 74f4 e8???????? 74ed 33c0 eb04 }
            // n = 5, score = 400
            //   74f4                 | je                  0xfffffff6
            //   e8????????           |                     
            //   74ed                 | je                  0xffffffef
            //   33c0                 | xor                 eax, eax
            //   eb04                 | jmp                 6

        $sequence_2 = { 57 51 fc 8b750c 8b7d08 }
            // n = 5, score = 400
            //   57                   | push                edi
            //   51                   | push                ecx
            //   fc                   | cld                 
            //   8b750c               | mov                 esi, dword ptr [ebp + 0xc]
            //   8b7d08               | mov                 edi, dword ptr [ebp + 8]

        $sequence_3 = { fc 8b750c 8b7d08 8b4d10 d1e9 f366a5 59 }
            // n = 7, score = 400
            //   fc                   | cld                 
            //   8b750c               | mov                 esi, dword ptr [ebp + 0xc]
            //   8b7d08               | mov                 edi, dword ptr [ebp + 8]
            //   8b4d10               | mov                 ecx, dword ptr [ebp + 0x10]
            //   d1e9                 | shr                 ecx, 1
            //   f366a5               | rep movsw           word ptr es:[edi], word ptr [esi]
            //   59                   | pop                 ecx

        $sequence_4 = { 74ed 33c0 eb04 8bc6 91 41 }
            // n = 6, score = 400
            //   74ed                 | je                  0xffffffef
            //   33c0                 | xor                 eax, eax
            //   eb04                 | jmp                 6
            //   8bc6                 | mov                 eax, esi
            //   91                   | xchg                eax, ecx
            //   41                   | inc                 ecx

        $sequence_5 = { 7508 8bdf 897508 4e ebb8 3c23 }
            // n = 6, score = 400
            //   7508                 | jne                 0xa
            //   8bdf                 | mov                 ebx, edi
            //   897508               | mov                 dword ptr [ebp + 8], esi
            //   4e                   | dec                 esi
            //   ebb8                 | jmp                 0xffffffba
            //   3c23                 | cmp                 al, 0x23

        $sequence_6 = { 8bc7 5e 5f 59 c9 c20c00 3c20 }
            // n = 7, score = 400
            //   8bc7                 | mov                 eax, edi
            //   5e                   | pop                 esi
            //   5f                   | pop                 edi
            //   59                   | pop                 ecx
            //   c9                   | leave               
            //   c20c00               | ret                 0xc
            //   3c20                 | cmp                 al, 0x20

        $sequence_7 = { 74ed 33c0 eb04 8bc6 }
            // n = 4, score = 400
            //   74ed                 | je                  0xffffffef
            //   33c0                 | xor                 eax, eax
            //   eb04                 | jmp                 6
            //   8bc6                 | mov                 eax, esi

        $sequence_8 = { e8???????? 74ed 33c0 eb04 }
            // n = 4, score = 400
            //   e8????????           |                     
            //   74ed                 | je                  0xffffffef
            //   33c0                 | xor                 eax, eax
            //   eb04                 | jmp                 6

        $sequence_9 = { 3bd3 0f8572ffffff 33c9 e9???????? b32a 397d14 }
            // n = 6, score = 400
            //   3bd3                 | cmp                 edx, ebx
            //   0f8572ffffff         | jne                 0xffffff78
            //   33c9                 | xor                 ecx, ecx
            //   e9????????           |                     
            //   b32a                 | mov                 bl, 0x2a
            //   397d14               | cmp                 dword ptr [ebp + 0x14], edi

    condition:
        7 of them and filesize < 122880
}
[TLP:WHITE] win_backswap_w0   (20180620 | No description)
rule win_backswap_w0 {
    meta:
        author = "psrok/des"
        module = "tinba"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.backswap"
        malpedia_version = "20180620"
        malpedia_license = "CC BY-NC-SA 4.0"
        malpedia_sharing = "TLP:WHITE"
    strings:
        $api_routine = { B8 07 00 00 00 F7 ?? 8B ?? 0F B6 ?? 03 ?? 47 80 ?? ?? 75 EC }
        $api_loadlib = { E4 5A 57 5A }
        $api_getmodulehandle = { 27 D4 2B C0 }
        $rcxor = { 80 74 01 FF 08 80 74 01 FF 07 80 74 01 FF 06 }
        $str1 = "RespectMyAuthority"
        $str2 = "MozillaWindowClass"
        $get_urls_to_inject = { 50 FF [1-5] 8D 83 [4] FF D0 85 C0 74 [1] E8 }
    condition:
        all of ($api*) or ( ( all of ($str*) or $get_urls_to_inject ) and $rcxor )
}
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