SYMBOLCOMMON_NAMEaka. SYNONYMS
win.sendsafe (Back to overview)

SendSafe

URLhaus    

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References
2021-01-10Medium walmartglobaltechJason Reaves
@online{reaves:20210110:man1:54a4162, author = {Jason Reaves}, title = {{MAN1, Moskal, Hancitor and a side of Ransomware}}, date = {2021-01-10}, organization = {Medium walmartglobaltech}, url = {https://medium.com/walmartglobaltech/man1-moskal-hancitor-and-a-side-of-ransomware-d77b4d991618}, language = {English}, urldate = {2021-01-11} } MAN1, Moskal, Hancitor and a side of Ransomware
Cobalt Strike Hancitor SendSafe VegaLocker Zeppelin Ransomware
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 (20201023 | autogenerated rule brought to you by yara-signator)
rule win_sendsafe_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2020-12-22"
        version = "1"
        description = "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.sendsafe"
        malpedia_rule_date = "20201222"
        malpedia_hash = "30354d830a29f0fbd3714d93d94dea941d77a130"
        malpedia_version = "20201023"
        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 = { e8???????? 8bd8 33f6 53 e8???????? 83c408 85c0 }
            // n = 7, score = 200
            //   e8????????           |                     
            //   8bd8                 | mov                 ebx, eax
            //   33f6                 | xor                 esi, esi
            //   53                   | push                ebx
            //   e8????????           |                     
            //   83c408               | add                 esp, 8
            //   85c0                 | test                eax, eax

        $sequence_1 = { e8???????? 83c408 85c0 742e 6aff 6a00 8b4518 }
            // n = 7, score = 200
            //   e8????????           |                     
            //   83c408               | add                 esp, 8
            //   85c0                 | test                eax, eax
            //   742e                 | je                  0x30
            //   6aff                 | push                -1
            //   6a00                 | push                0
            //   8b4518               | mov                 eax, dword ptr [ebp + 0x18]

        $sequence_2 = { e9???????? c645fc00 8d8dc0eeffff e8???????? 8b15???????? 52 8b4508 }
            // n = 7, score = 200
            //   e9????????           |                     
            //   c645fc00             | mov                 byte ptr [ebp - 4], 0
            //   8d8dc0eeffff         | lea                 ecx, [ebp - 0x1140]
            //   e8????????           |                     
            //   8b15????????         |                     
            //   52                   | push                edx
            //   8b4508               | mov                 eax, dword ptr [ebp + 8]

        $sequence_3 = { e8???????? 83c408 8b45f8 8b484c 8b5510 8d440a10 8b4df8 }
            // n = 7, score = 200
            //   e8????????           |                     
            //   83c408               | add                 esp, 8
            //   8b45f8               | mov                 eax, dword ptr [ebp - 8]
            //   8b484c               | mov                 ecx, dword ptr [eax + 0x4c]
            //   8b5510               | mov                 edx, dword ptr [ebp + 0x10]
            //   8d440a10             | lea                 eax, [edx + ecx + 0x10]
            //   8b4df8               | mov                 ecx, dword ptr [ebp - 8]

        $sequence_4 = { e8???????? 83c404 8b45fc c70000000000 8b4d10 51 e8???????? }
            // n = 7, score = 200
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   8b45fc               | mov                 eax, dword ptr [ebp - 4]
            //   c70000000000         | mov                 dword ptr [eax], 0
            //   8b4d10               | mov                 ecx, dword ptr [ebp + 0x10]
            //   51                   | push                ecx
            //   e8????????           |                     

        $sequence_5 = { e9???????? c78628010000ffffffff e9???????? 83fb0f 7525 0fb607 48 }
            // n = 7, score = 200
            //   e9????????           |                     
            //   c78628010000ffffffff     | mov    dword ptr [esi + 0x128], 0xffffffff
            //   e9????????           |                     
            //   83fb0f               | cmp                 ebx, 0xf
            //   7525                 | jne                 0x27
            //   0fb607               | movzx               eax, byte ptr [edi]
            //   48                   | dec                 eax

        $sequence_6 = { eb7c c645ff01 c745f400000000 8b5508 8b4244 8945f8 eb12 }
            // n = 7, score = 200
            //   eb7c                 | jmp                 0x7e
            //   c645ff01             | mov                 byte ptr [ebp - 1], 1
            //   c745f400000000       | mov                 dword ptr [ebp - 0xc], 0
            //   8b5508               | mov                 edx, dword ptr [ebp + 8]
            //   8b4244               | mov                 eax, dword ptr [edx + 0x44]
            //   8945f8               | mov                 dword ptr [ebp - 8], eax
            //   eb12                 | jmp                 0x14

        $sequence_7 = { eb07 c7459400000000 8b45d4 83c010 894590 8b4d90 8b55d8 }
            // n = 7, score = 200
            //   eb07                 | jmp                 9
            //   c7459400000000       | mov                 dword ptr [ebp - 0x6c], 0
            //   8b45d4               | mov                 eax, dword ptr [ebp - 0x2c]
            //   83c010               | add                 eax, 0x10
            //   894590               | mov                 dword ptr [ebp - 0x70], eax
            //   8b4d90               | mov                 ecx, dword ptr [ebp - 0x70]
            //   8b55d8               | mov                 edx, dword ptr [ebp - 0x28]

        $sequence_8 = { ebc7 eb92 e9???????? 8b55d8 3b55ec 0f8e94000000 8b45d8 }
            // n = 7, score = 200
            //   ebc7                 | jmp                 0xffffffc9
            //   eb92                 | jmp                 0xffffff94
            //   e9????????           |                     
            //   8b55d8               | mov                 edx, dword ptr [ebp - 0x28]
            //   3b55ec               | cmp                 edx, dword ptr [ebp - 0x14]
            //   0f8e94000000         | jle                 0x9a
            //   8b45d8               | mov                 eax, dword ptr [ebp - 0x28]

        $sequence_9 = { f7f9 8945fc 8b55fc 3b5508 7c09 8b4508 83e801 }
            // n = 7, score = 200
            //   f7f9                 | idiv                ecx
            //   8945fc               | mov                 dword ptr [ebp - 4], eax
            //   8b55fc               | mov                 edx, dword ptr [ebp - 4]
            //   3b5508               | cmp                 edx, dword ptr [ebp + 8]
            //   7c09                 | jl                  0xb
            //   8b4508               | mov                 eax, dword ptr [ebp + 8]
            //   83e801               | sub                 eax, 1

    condition:
        7 of them and filesize < 3743744
}
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