SYMBOLCOMMON_NAMEaka. SYNONYMS
win.atmii (Back to overview)

ATMii


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References
2017-10-10Kaspersky LabsKonstantin Zykov
@online{zykov:20171010:atmii:1e731ab, author = {Konstantin Zykov}, title = {{ATMii: a small but effective ATM robber}}, date = {2017-10-10}, organization = {Kaspersky Labs}, url = {https://securelist.com/atmii-a-small-but-effective-atm-robber/82707/}, language = {English}, urldate = {2019-12-20} } ATMii: a small but effective ATM robber
ATMii
Yara Rules
[TLP:WHITE] win_atmii_auto (20230125 | Detects win.atmii.)
rule win_atmii_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-01-25"
        version = "1"
        description = "Detects win.atmii."
        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.atmii"
        malpedia_rule_date = "20230124"
        malpedia_hash = "2ee0eebba83dce3d019a90519f2f972c0fcf9686"
        malpedia_version = "20230125"
        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 = { eb2a eb26 8b55fc 83c20d }
            // n = 4, score = 100
            //   eb2a                 | jmp                 0x2c
            //   eb26                 | jmp                 0x28
            //   8b55fc               | mov                 edx, dword ptr [ebp - 4]
            //   83c20d               | add                 edx, 0xd

        $sequence_1 = { 68???????? 6a46 8845ff 8945f8 }
            // n = 4, score = 100
            //   68????????           |                     
            //   6a46                 | push                0x46
            //   8845ff               | mov                 byte ptr [ebp - 1], al
            //   8945f8               | mov                 dword ptr [ebp - 8], eax

        $sequence_2 = { 8a8500ffffff 57 8b3d???????? 884dfc 8d4dfc }
            // n = 5, score = 100
            //   8a8500ffffff         | mov                 al, byte ptr [ebp - 0x100]
            //   57                   | push                edi
            //   8b3d????????         |                     
            //   884dfc               | mov                 byte ptr [ebp - 4], cl
            //   8d4dfc               | lea                 ecx, [ebp - 4]

        $sequence_3 = { 7464 8b4e04 57 8b3d???????? 68???????? 51 ffd7 }
            // n = 7, score = 100
            //   7464                 | je                  0x66
            //   8b4e04               | mov                 ecx, dword ptr [esi + 4]
            //   57                   | push                edi
            //   8b3d????????         |                     
            //   68????????           |                     
            //   51                   | push                ecx
            //   ffd7                 | call                edi

        $sequence_4 = { 897df8 e8???????? 83c40c 8b4df8 51 8d45d0 }
            // n = 6, score = 100
            //   897df8               | mov                 dword ptr [ebp - 8], edi
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc
            //   8b4df8               | mov                 ecx, dword ptr [ebp - 8]
            //   51                   | push                ecx
            //   8d45d0               | lea                 eax, [ebp - 0x30]

        $sequence_5 = { 680d020000 8d85fcfcffff 68???????? 50 ffd6 83c410 }
            // n = 6, score = 100
            //   680d020000           | push                0x20d
            //   8d85fcfcffff         | lea                 eax, [ebp - 0x304]
            //   68????????           |                     
            //   50                   | push                eax
            //   ffd6                 | call                esi
            //   83c410               | add                 esp, 0x10

        $sequence_6 = { 8d45b8 50 68???????? 68b6000000 }
            // n = 4, score = 100
            //   8d45b8               | lea                 eax, [ebp - 0x48]
            //   50                   | push                eax
            //   68????????           |                     
            //   68b6000000           | push                0xb6

        $sequence_7 = { ff15???????? 8b4dfc 8d45f8 50 }
            // n = 4, score = 100
            //   ff15????????         |                     
            //   8b4dfc               | mov                 ecx, dword ptr [ebp - 4]
            //   8d45f8               | lea                 eax, [ebp - 8]
            //   50                   | push                eax

        $sequence_8 = { 85c0 750a 8b4dfc 8b5109 ffd2 }
            // n = 5, score = 100
            //   85c0                 | test                eax, eax
            //   750a                 | jne                 0xc
            //   8b4dfc               | mov                 ecx, dword ptr [ebp - 4]
            //   8b5109               | mov                 edx, dword ptr [ecx + 9]
            //   ffd2                 | call                edx

        $sequence_9 = { ff15???????? 85c0 7527 68???????? 689e000000 }
            // n = 5, score = 100
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax
            //   7527                 | jne                 0x29
            //   68????????           |                     
            //   689e000000           | push                0x9e

        $sequence_10 = { 8b45fc 50 e8???????? 83c404 56 ff15???????? 5f }
            // n = 7, score = 100
            //   8b45fc               | mov                 eax, dword ptr [ebp - 4]
            //   50                   | push                eax
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   56                   | push                esi
            //   ff15????????         |                     
            //   5f                   | pop                 edi

        $sequence_11 = { ffd7 83c418 8d9d00feffff e8???????? }
            // n = 4, score = 100
            //   ffd7                 | call                edi
            //   83c418               | add                 esp, 0x18
            //   8d9d00feffff         | lea                 ebx, [ebp - 0x200]
            //   e8????????           |                     

        $sequence_12 = { 7454 8b4dfc 0fb611 85d2 }
            // n = 4, score = 100
            //   7454                 | je                  0x56
            //   8b4dfc               | mov                 ecx, dword ptr [ebp - 4]
            //   0fb611               | movzx               edx, byte ptr [ecx]
            //   85d2                 | test                edx, edx

        $sequence_13 = { 6800020000 8d8d28fbffff 51 6a00 ff15???????? 50 }
            // n = 6, score = 100
            //   6800020000           | push                0x200
            //   8d8d28fbffff         | lea                 ecx, [ebp - 0x4d8]
            //   51                   | push                ecx
            //   6a00                 | push                0
            //   ff15????????         |                     
            //   50                   | push                eax

        $sequence_14 = { 8be5 5d c3 8b4e04 68???????? 51 ffd7 }
            // n = 7, score = 100
            //   8be5                 | mov                 esp, ebp
            //   5d                   | pop                 ebp
            //   c3                   | ret                 
            //   8b4e04               | mov                 ecx, dword ptr [esi + 4]
            //   68????????           |                     
            //   51                   | push                ecx
            //   ffd7                 | call                edi

        $sequence_15 = { 5d c21400 68???????? 6869020000 8d8500feffff 68???????? }
            // n = 6, score = 100
            //   5d                   | pop                 ebp
            //   c21400               | ret                 0x14
            //   68????????           |                     
            //   6869020000           | push                0x269
            //   8d8500feffff         | lea                 eax, [ebp - 0x200]
            //   68????????           |                     

    condition:
        7 of them and filesize < 49152
}
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