SYMBOLCOMMON_NAMEaka. SYNONYMS
win.sendsafe (Back to overview)

SendSafe

URLhaus    

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References
2017-10-06CERT.PLMaciej Kotowicz, Jarosław Jedynak
@techreport{kotowicz:20171006:peering:668c82e, author = {Maciej Kotowicz and Jarosław Jedynak}, title = {{Peering into spam botnets}}, date = {2017-10-06}, institution = {CERT.PL}, url = {https://lokalhost.pl/txt/peering.into.spam.botnets.VirusBulletin2017.pdf}, language = {English}, urldate = {2020-04-06} } Peering into spam botnets
Emotet Kelihos Necurs SendSafe Tofsee
Yara Rules
[TLP:WHITE] win_sendsafe_auto (20201014 | autogenerated rule brought to you by yara-signator)
rule win_sendsafe_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2020-10-14"
        version = "1"
        description = "autogenerated rule brought to you by yara-signator"
        tool = "yara-signator v0.5.0"
        tool_config = "callsandjumps;datarefs;binvalue"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.sendsafe"
        malpedia_rule_date = "20201014"
        malpedia_hash = "a7e3bd57eaf12bf3ea29a863c041091ba3af9ac9"
        malpedia_version = "20201014"
        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 = { c7422800000000 8be5 5d c3 55 8bec 51 }
            // n = 7, score = 200
            //   c7422800000000       | mov                 dword ptr [edx + 0x28], 0
            //   8be5                 | mov                 esp, ebp
            //   5d                   | pop                 ebp
            //   c3                   | ret                 
            //   55                   | push                ebp
            //   8bec                 | mov                 ebp, esp
            //   51                   | push                ecx

        $sequence_1 = { eb0d 8b55d4 8955e8 c745c000000000 837dc000 7d0c c745e000000000 }
            // n = 7, score = 200
            //   eb0d                 | jmp                 0xf
            //   8b55d4               | mov                 edx, dword ptr [ebp - 0x2c]
            //   8955e8               | mov                 dword ptr [ebp - 0x18], edx
            //   c745c000000000       | mov                 dword ptr [ebp - 0x40], 0
            //   837dc000             | cmp                 dword ptr [ebp - 0x40], 0
            //   7d0c                 | jge                 0xe
            //   c745e000000000       | mov                 dword ptr [ebp - 0x20], 0

        $sequence_2 = { e8???????? 83c408 eb0c 8d0424 50 e8???????? 83c404 }
            // n = 7, score = 200
            //   e8????????           |                     
            //   83c408               | add                 esp, 8
            //   eb0c                 | jmp                 0xe
            //   8d0424               | lea                 eax, [esp]
            //   50                   | push                eax
            //   e8????????           |                     
            //   83c404               | add                 esp, 4

        $sequence_3 = { e8???????? 83c408 8b5508 8b8280750000 50 8b4d08 8b9194750000 }
            // n = 7, score = 200
            //   e8????????           |                     
            //   83c408               | add                 esp, 8
            //   8b5508               | mov                 edx, dword ptr [ebp + 8]
            //   8b8280750000         | mov                 eax, dword ptr [edx + 0x7580]
            //   50                   | push                eax
            //   8b4d08               | mov                 ecx, dword ptr [ebp + 8]
            //   8b9194750000         | mov                 edx, dword ptr [ecx + 0x7594]

        $sequence_4 = { 8b4dcc 8b11 0fbe02 83f825 0f85ba010000 8b4dcc 8b11 }
            // n = 7, score = 200
            //   8b4dcc               | mov                 ecx, dword ptr [ebp - 0x34]
            //   8b11                 | mov                 edx, dword ptr [ecx]
            //   0fbe02               | movsx               eax, byte ptr [edx]
            //   83f825               | cmp                 eax, 0x25
            //   0f85ba010000         | jne                 0x1c0
            //   8b4dcc               | mov                 ecx, dword ptr [ebp - 0x34]
            //   8b11                 | mov                 edx, dword ptr [ecx]

        $sequence_5 = { 8b4dd0 894de8 837de800 7410 8b55e8 8b45ec 8902 }
            // n = 7, score = 200
            //   8b4dd0               | mov                 ecx, dword ptr [ebp - 0x30]
            //   894de8               | mov                 dword ptr [ebp - 0x18], ecx
            //   837de800             | cmp                 dword ptr [ebp - 0x18], 0
            //   7410                 | je                  0x12
            //   8b55e8               | mov                 edx, dword ptr [ebp - 0x18]
            //   8b45ec               | mov                 eax, dword ptr [ebp - 0x14]
            //   8902                 | mov                 dword ptr [edx], eax

        $sequence_6 = { 8b55fc c7440a3400000000 8b4508 83786404 7e31 8b4d08 8b11 }
            // n = 7, score = 200
            //   8b55fc               | mov                 edx, dword ptr [ebp - 4]
            //   c7440a3400000000     | mov                 dword ptr [edx + ecx + 0x34], 0
            //   8b4508               | mov                 eax, dword ptr [ebp + 8]
            //   83786404             | cmp                 dword ptr [eax + 0x64], 4
            //   7e31                 | jle                 0x33
            //   8b4d08               | mov                 ecx, dword ptr [ebp + 8]
            //   8b11                 | mov                 edx, dword ptr [ecx]

        $sequence_7 = { e9???????? 0fb6955afdffff 85d2 753c 8b8d5cfdffff e8???????? 8b855cfdffff }
            // n = 7, score = 200
            //   e9????????           |                     
            //   0fb6955afdffff       | movzx               edx, byte ptr [ebp - 0x2a6]
            //   85d2                 | test                edx, edx
            //   753c                 | jne                 0x3e
            //   8b8d5cfdffff         | mov                 ecx, dword ptr [ebp - 0x2a4]
            //   e8????????           |                     
            //   8b855cfdffff         | mov                 eax, dword ptr [ebp - 0x2a4]

        $sequence_8 = { e8???????? 83c410 83f801 7407 c745a8ffffffff 837da800 7513 }
            // n = 7, score = 200
            //   e8????????           |                     
            //   83c410               | add                 esp, 0x10
            //   83f801               | cmp                 eax, 1
            //   7407                 | je                  9
            //   c745a8ffffffff       | mov                 dword ptr [ebp - 0x58], 0xffffffff
            //   837da800             | cmp                 dword ptr [ebp - 0x58], 0
            //   7513                 | jne                 0x15

        $sequence_9 = { e8???????? 83c414 8bc5 5e 5b 5d 83c40c }
            // n = 7, score = 200
            //   e8????????           |                     
            //   83c414               | add                 esp, 0x14
            //   8bc5                 | mov                 eax, ebp
            //   5e                   | pop                 esi
            //   5b                   | pop                 ebx
            //   5d                   | pop                 ebp
            //   83c40c               | add                 esp, 0xc

    condition:
        7 of them and filesize < 3743744
}
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