SYMBOLCOMMON_NAMEaka. SYNONYMS
win.r980 (Back to overview)

r980


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References
2016-07-26AlienVaultBartBlaze
@online{bartblaze:20160726:otx:b95458e, author = {BartBlaze}, title = {{OTX Pulse on R980 ransomware}}, date = {2016-07-26}, organization = {AlienVault}, url = {https://otx.alienvault.com/pulse/57976b52b900fe01376feb01/}, language = {English}, urldate = {2020-01-13} } OTX Pulse on R980 ransomware
r980
Yara Rules
[TLP:WHITE] win_r980_auto (20220411 | Detects win.r980.)
rule win_r980_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-04-08"
        version = "1"
        description = "Detects win.r980."
        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.r980"
        malpedia_rule_date = "20220405"
        malpedia_hash = "ecd38294bd47d5589be5cd5490dc8bb4804afc2a"
        malpedia_version = "20220411"
        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 = { 8d45c8 8bce 50 53 e8???????? c745c401000000 c645fc05 }
            // n = 7, score = 200
            //   8d45c8               | lea                 eax, dword ptr [ebp - 0x38]
            //   8bce                 | mov                 ecx, esi
            //   50                   | push                eax
            //   53                   | push                ebx
            //   e8????????           |                     
            //   c745c401000000       | mov                 dword ptr [ebp - 0x3c], 1
            //   c645fc05             | mov                 byte ptr [ebp - 4], 5

        $sequence_1 = { c74508???????? c745fc02000000 8b7d10 85ff 7421 83cbff 8bc3 }
            // n = 7, score = 200
            //   c74508????????       |                     
            //   c745fc02000000       | mov                 dword ptr [ebp - 4], 2
            //   8b7d10               | mov                 edi, dword ptr [ebp + 0x10]
            //   85ff                 | test                edi, edi
            //   7421                 | je                  0x23
            //   83cbff               | or                  ebx, 0xffffffff
            //   8bc3                 | mov                 eax, ebx

        $sequence_2 = { e8???????? 8b5508 8d4de8 e8???????? 83c40c 8b10 8b4804 }
            // n = 7, score = 200
            //   e8????????           |                     
            //   8b5508               | mov                 edx, dword ptr [ebp + 8]
            //   8d4de8               | lea                 ecx, dword ptr [ebp - 0x18]
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc
            //   8b10                 | mov                 edx, dword ptr [eax]
            //   8b4804               | mov                 ecx, dword ptr [eax + 4]

        $sequence_3 = { c745f000000000 c745fc01000000 e8???????? 8b7004 8b38 85f6 7404 }
            // n = 7, score = 200
            //   c745f000000000       | mov                 dword ptr [ebp - 0x10], 0
            //   c745fc01000000       | mov                 dword ptr [ebp - 4], 1
            //   e8????????           |                     
            //   8b7004               | mov                 esi, dword ptr [eax + 4]
            //   8b38                 | mov                 edi, dword ptr [eax]
            //   85f6                 | test                esi, esi
            //   7404                 | je                  6

        $sequence_4 = { 57 53 e8???????? 83c40c e9???????? a900040000 0f84b0000000 }
            // n = 7, score = 200
            //   57                   | push                edi
            //   53                   | push                ebx
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc
            //   e9????????           |                     
            //   a900040000           | test                eax, 0x400
            //   0f84b0000000         | je                  0xb6

        $sequence_5 = { 8bc8 e8???????? c645fc07 8b75bc 85f6 741f 8bc3 }
            // n = 7, score = 200
            //   8bc8                 | mov                 ecx, eax
            //   e8????????           |                     
            //   c645fc07             | mov                 byte ptr [ebp - 4], 7
            //   8b75bc               | mov                 esi, dword ptr [ebp - 0x44]
            //   85f6                 | test                esi, esi
            //   741f                 | je                  0x21
            //   8bc3                 | mov                 eax, ebx

        $sequence_6 = { 89040b 8b4604 83e70f 033c03 5b 7407 8b4508 }
            // n = 7, score = 200
            //   89040b               | mov                 dword ptr [ebx + ecx], eax
            //   8b4604               | mov                 eax, dword ptr [esi + 4]
            //   83e70f               | and                 edi, 0xf
            //   033c03               | add                 edi, dword ptr [ebx + eax]
            //   5b                   | pop                 ebx
            //   7407                 | je                  9
            //   8b4508               | mov                 eax, dword ptr [ebp + 8]

        $sequence_7 = { 8d4dd8 e8???????? 56 8bd0 c645fc0d 8d4da8 e8???????? }
            // n = 7, score = 200
            //   8d4dd8               | lea                 ecx, dword ptr [ebp - 0x28]
            //   e8????????           |                     
            //   56                   | push                esi
            //   8bd0                 | mov                 edx, eax
            //   c645fc0d             | mov                 byte ptr [ebp - 4], 0xd
            //   8d4da8               | lea                 ecx, dword ptr [ebp - 0x58]
            //   e8????????           |                     

        $sequence_8 = { c7472400000000 c645fc06 8b8b4c010000 85c9 7408 8b01 57 }
            // n = 7, score = 200
            //   c7472400000000       | mov                 dword ptr [edi + 0x24], 0
            //   c645fc06             | mov                 byte ptr [ebp - 4], 6
            //   8b8b4c010000         | mov                 ecx, dword ptr [ebx + 0x14c]
            //   85c9                 | test                ecx, ecx
            //   7408                 | je                  0xa
            //   8b01                 | mov                 eax, dword ptr [ecx]
            //   57                   | push                edi

        $sequence_9 = { 8b4e08 8bfa 8b1e f3aa 52 e8???????? 6a18 }
            // n = 7, score = 200
            //   8b4e08               | mov                 ecx, dword ptr [esi + 8]
            //   8bfa                 | mov                 edi, edx
            //   8b1e                 | mov                 ebx, dword ptr [esi]
            //   f3aa                 | rep stosb           byte ptr es:[edi], al
            //   52                   | push                edx
            //   e8????????           |                     
            //   6a18                 | push                0x18

    condition:
        7 of them and filesize < 3178496
}
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