SYMBOLCOMMON_NAMEaka. SYNONYMS
win.roseam (Back to overview)

Roseam

Actor(s): Wekby


There is no description at this point.

References
2016-05-24Palo Alto Networks Unit 42Josh Grunzweig, Mike Scott, Bryan Lee
@online{grunzweig:20160524:new:d1cd669, author = {Josh Grunzweig and Mike Scott and Bryan Lee}, title = {{New Wekby Attacks Use DNS Requests As Command and Control Mechanism}}, date = {2016-05-24}, organization = {Palo Alto Networks Unit 42}, url = {http://researchcenter.paloaltonetworks.com/2016/05/unit42-new-wekby-attacks-use-dns-requests-as-command-and-control-mechanism/}, language = {English}, urldate = {2019-12-20} } New Wekby Attacks Use DNS Requests As Command and Control Mechanism
Roseam
Yara Rules
[TLP:WHITE] win_roseam_auto (20201014 | autogenerated rule brought to you by yara-signator)
rule win_roseam_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.roseam"
        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 = { 5d 58 85d2 0f8e5c020000 8b450c 8b4d08 2bc8 }
            // n = 7, score = 100
            //   5d                   | pop                 ebp
            //   58                   | pop                 eax
            //   85d2                 | test                edx, edx
            //   0f8e5c020000         | jle                 0x262
            //   8b450c               | mov                 eax, dword ptr [ebp + 0xc]
            //   8b4d08               | mov                 ecx, dword ptr [ebp + 8]
            //   2bc8                 | sub                 ecx, eax

        $sequence_1 = { 56 33c0 8dbdf4a9ffff 68???????? }
            // n = 4, score = 100
            //   56                   | push                esi
            //   33c0                 | xor                 eax, eax
            //   8dbdf4a9ffff         | lea                 edi, [ebp - 0x560c]
            //   68????????           |                     

        $sequence_2 = { 58 80880191410008 40 3dff000000 72f1 56 }
            // n = 6, score = 100
            //   58                   | pop                 eax
            //   80880191410008       | or                  byte ptr [eax + 0x419101], 8
            //   40                   | inc                 eax
            //   3dff000000           | cmp                 eax, 0xff
            //   72f1                 | jb                  0xfffffff3
            //   56                   | push                esi

        $sequence_3 = { 5d 9d 5d 58 33c0 }
            // n = 5, score = 100
            //   5d                   | pop                 ebp
            //   9d                   | popfd               
            //   5d                   | pop                 ebp
            //   58                   | pop                 eax
            //   33c0                 | xor                 eax, eax

        $sequence_4 = { 51 8810 40 50 e8???????? }
            // n = 5, score = 100
            //   51                   | push                ecx
            //   8810                 | mov                 byte ptr [eax], dl
            //   40                   | inc                 eax
            //   50                   | push                eax
            //   e8????????           |                     

        $sequence_5 = { 8bf0 52 8d8559ffffff 56 }
            // n = 4, score = 100
            //   8bf0                 | mov                 esi, eax
            //   52                   | push                edx
            //   8d8559ffffff         | lea                 eax, [ebp - 0xa7]
            //   56                   | push                esi

        $sequence_6 = { 8b048560a24100 8d04c8 eb05 b8???????? }
            // n = 4, score = 100
            //   8b048560a24100       | mov                 eax, dword ptr [eax*4 + 0x41a260]
            //   8d04c8               | lea                 eax, [eax + ecx*8]
            //   eb05                 | jmp                 7
            //   b8????????           |                     

        $sequence_7 = { 5d 9d 5d 8d4de0 8d55fc 51 }
            // n = 6, score = 100
            //   5d                   | pop                 ebp
            //   9d                   | popfd               
            //   5d                   | pop                 ebp
            //   8d4de0               | lea                 ecx, [ebp - 0x20]
            //   8d55fc               | lea                 edx, [ebp - 4]
            //   51                   | push                ecx

        $sequence_8 = { 5d 9d 5d 8b859cfdffff 8b8dbcfdffff 50 8b45fc }
            // n = 7, score = 100
            //   5d                   | pop                 ebp
            //   9d                   | popfd               
            //   5d                   | pop                 ebp
            //   8b859cfdffff         | mov                 eax, dword ptr [ebp - 0x264]
            //   8b8dbcfdffff         | mov                 ecx, dword ptr [ebp - 0x244]
            //   50                   | push                eax
            //   8b45fc               | mov                 eax, dword ptr [ebp - 4]

        $sequence_9 = { a3???????? 50 68???????? 50 b845050000 }
            // n = 5, score = 100
            //   a3????????           |                     
            //   50                   | push                eax
            //   68????????           |                     
            //   50                   | push                eax
            //   b845050000           | mov                 eax, 0x545

    condition:
        7 of them and filesize < 221184
}
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