SYMBOLCOMMON_NAMEaka. SYNONYMS
win.hdmr (Back to overview)

HDMR

aka: GO-SPORT

HDMR is a ransomware which encrypts user files and adds a .DMR64 extension. It also drops a ransom note named: "!!! READ THIS !!!.hta".

References
2019-12-12Twitter (@malwrhunterteam)malwrhunterteam
@online{malwrhunterteam:20191212:dmr:dc8b2ad, author = {malwrhunterteam}, title = {{Tweet on DMR Ransomware}}, date = {2019-12-12}, organization = {Twitter (@malwrhunterteam)}, url = {https://twitter.com/malwrhunterteam/status/1205096379711918080/photo/1}, language = {English}, urldate = {2020-01-09} } Tweet on DMR Ransomware
HDMR
2019-10-25Andrew Ivanov
@online{ivanov:20191025:hdmr:de88a6d, author = {Andrew Ivanov}, title = {{HDMR, GO-SPORT}}, date = {2019-10-25}, url = {http://id-ransomware.blogspot.com/2019/10/hdmr-ransomware.html}, language = {Russian}, urldate = {2020-01-08} } HDMR, GO-SPORT
HDMR
Yara Rules
[TLP:WHITE] win_hdmr_auto (20230125 | Detects win.hdmr.)
rule win_hdmr_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-01-25"
        version = "1"
        description = "Detects win.hdmr."
        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.hdmr"
        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 = { 8d942470040000 68???????? 52 e8???????? 6a44 8d442434 6a00 }
            // n = 7, score = 100
            //   8d942470040000       | lea                 edx, [esp + 0x470]
            //   68????????           |                     
            //   52                   | push                edx
            //   e8????????           |                     
            //   6a44                 | push                0x44
            //   8d442434             | lea                 eax, [esp + 0x34]
            //   6a00                 | push                0

        $sequence_1 = { ff15???????? 8b7508 c7465cd8204100 83660800 }
            // n = 4, score = 100
            //   ff15????????         |                     
            //   8b7508               | mov                 esi, dword ptr [ebp + 8]
            //   c7465cd8204100       | mov                 dword ptr [esi + 0x5c], 0x4120d8
            //   83660800             | and                 dword ptr [esi + 8], 0

        $sequence_2 = { 8bd1 c1fa05 c1e006 03049540d04100 eb05 b8???????? f6400420 }
            // n = 7, score = 100
            //   8bd1                 | mov                 edx, ecx
            //   c1fa05               | sar                 edx, 5
            //   c1e006               | shl                 eax, 6
            //   03049540d04100       | add                 eax, dword ptr [edx*4 + 0x41d040]
            //   eb05                 | jmp                 7
            //   b8????????           |                     
            //   f6400420             | test                byte ptr [eax + 4], 0x20

        $sequence_3 = { 2bc2 6689840d78ffffff c1e810 83e001 }
            // n = 4, score = 100
            //   2bc2                 | sub                 eax, edx
            //   6689840d78ffffff     | mov                 word ptr [ebp + ecx - 0x88], ax
            //   c1e810               | shr                 eax, 0x10
            //   83e001               | and                 eax, 1

        $sequence_4 = { 8bd6 81e2ff000000 333c9568424100 895df4 }
            // n = 4, score = 100
            //   8bd6                 | mov                 edx, esi
            //   81e2ff000000         | and                 edx, 0xff
            //   333c9568424100       | xor                 edi, dword ptr [edx*4 + 0x414268]
            //   895df4               | mov                 dword ptr [ebp - 0xc], ebx

        $sequence_5 = { 8d8c24720a0000 51 66898424740a0000 e8???????? 83c40c 8d542444 52 }
            // n = 7, score = 100
            //   8d8c24720a0000       | lea                 ecx, [esp + 0xa72]
            //   51                   | push                ecx
            //   66898424740a0000     | mov                 word ptr [esp + 0xa74], ax
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc
            //   8d542444             | lea                 edx, [esp + 0x44]
            //   52                   | push                edx

        $sequence_6 = { 53 8bc8 ffd2 5f 5e 5b }
            // n = 6, score = 100
            //   53                   | push                ebx
            //   8bc8                 | mov                 ecx, eax
            //   ffd2                 | call                edx
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi
            //   5b                   | pop                 ebx

        $sequence_7 = { 8b5234 51 8b4d08 51 8bc8 ffd2 8b4df4 }
            // n = 7, score = 100
            //   8b5234               | mov                 edx, dword ptr [edx + 0x34]
            //   51                   | push                ecx
            //   8b4d08               | mov                 ecx, dword ptr [ebp + 8]
            //   51                   | push                ecx
            //   8bc8                 | mov                 ecx, eax
            //   ffd2                 | call                edx
            //   8b4df4               | mov                 ecx, dword ptr [ebp - 0xc]

        $sequence_8 = { 334808 8b5d08 894dec 8bce }
            // n = 4, score = 100
            //   334808               | xor                 ecx, dword ptr [eax + 8]
            //   8b5d08               | mov                 ebx, dword ptr [ebp + 8]
            //   894dec               | mov                 dword ptr [ebp - 0x14], ecx
            //   8bce                 | mov                 ecx, esi

        $sequence_9 = { f7e9 c1fa17 8bc2 c1e81f 03c2 69c000004001 8bd1 }
            // n = 7, score = 100
            //   f7e9                 | imul                ecx
            //   c1fa17               | sar                 edx, 0x17
            //   8bc2                 | mov                 eax, edx
            //   c1e81f               | shr                 eax, 0x1f
            //   03c2                 | add                 eax, edx
            //   69c000004001         | imul                eax, eax, 0x1400000
            //   8bd1                 | mov                 edx, ecx

    condition:
        7 of them and filesize < 284672
}
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