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 (20220411 | Detects win.roseam.)
rule win_roseam_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-04-08"
        version = "1"
        description = "Detects win.roseam."
        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.roseam"
        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 = { 9d 5d 8b45f8 85c0 0f84db000000 68???????? 55 }
            // n = 7, score = 100
            //   9d                   | popfd               
            //   5d                   | pop                 ebp
            //   8b45f8               | mov                 eax, dword ptr [ebp - 8]
            //   85c0                 | test                eax, eax
            //   0f84db000000         | je                  0xe1
            //   68????????           |                     
            //   55                   | push                ebp

        $sequence_1 = { 50 51 8975fc ff15???????? 50 68???????? }
            // n = 6, score = 100
            //   50                   | push                eax
            //   51                   | push                ecx
            //   8975fc               | mov                 dword ptr [ebp - 4], esi
            //   ff15????????         |                     
            //   50                   | push                eax
            //   68????????           |                     

        $sequence_2 = { 897d0c 8a10 8aca 3a16 751c 84c9 }
            // n = 6, score = 100
            //   897d0c               | mov                 dword ptr [ebp + 0xc], edi
            //   8a10                 | mov                 dl, byte ptr [eax]
            //   8aca                 | mov                 cl, dl
            //   3a16                 | cmp                 dl, byte ptr [esi]
            //   751c                 | jne                 0x1e
            //   84c9                 | test                cl, cl

        $sequence_3 = { 5d 6a0e 8d8d7cffffff 6a36 51 }
            // n = 5, score = 100
            //   5d                   | pop                 ebp
            //   6a0e                 | push                0xe
            //   8d8d7cffffff         | lea                 ecx, dword ptr [ebp - 0x84]
            //   6a36                 | push                0x36
            //   51                   | push                ecx

        $sequence_4 = { 64a300000000 5d 5d 9d 5d 58 8b7dec }
            // n = 7, score = 100
            //   64a300000000         | mov                 dword ptr fs:[0], eax
            //   5d                   | pop                 ebp
            //   5d                   | pop                 ebp
            //   9d                   | popfd               
            //   5d                   | pop                 ebp
            //   58                   | pop                 eax
            //   8b7dec               | mov                 edi, dword ptr [ebp - 0x14]

        $sequence_5 = { 58 58 b945000000 33c0 8dbde8feffff f3ab }
            // n = 6, score = 100
            //   58                   | pop                 eax
            //   58                   | pop                 eax
            //   b945000000           | mov                 ecx, 0x45
            //   33c0                 | xor                 eax, eax
            //   8dbde8feffff         | lea                 edi, dword ptr [ebp - 0x118]
            //   f3ab                 | rep stosd           dword ptr es:[edi], eax

        $sequence_6 = { 83c404 53 e8???????? 83c404 be0a000000 }
            // n = 5, score = 100
            //   83c404               | add                 esp, 4
            //   53                   | push                ebx
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   be0a000000           | mov                 esi, 0xa

        $sequence_7 = { 8b4dec 33d2 8d71ff 85f6 7e63 8b7de8 8b4d10 }
            // n = 7, score = 100
            //   8b4dec               | mov                 ecx, dword ptr [ebp - 0x14]
            //   33d2                 | xor                 edx, edx
            //   8d71ff               | lea                 esi, dword ptr [ecx - 1]
            //   85f6                 | test                esi, esi
            //   7e63                 | jle                 0x65
            //   8b7de8               | mov                 edi, dword ptr [ebp - 0x18]
            //   8b4d10               | mov                 ecx, dword ptr [ebp + 0x10]

        $sequence_8 = { 80c120 888800904100 eb1f 83f861 7213 }
            // n = 5, score = 100
            //   80c120               | add                 cl, 0x20
            //   888800904100         | mov                 byte ptr [eax + 0x419000], cl
            //   eb1f                 | jmp                 0x21
            //   83f861               | cmp                 eax, 0x61
            //   7213                 | jb                  0x15

        $sequence_9 = { 50 e8???????? 8b450c 8b4d14 83c40c }
            // n = 5, score = 100
            //   50                   | push                eax
            //   e8????????           |                     
            //   8b450c               | mov                 eax, dword ptr [ebp + 0xc]
            //   8b4d14               | mov                 ecx, dword ptr [ebp + 0x14]
            //   83c40c               | add                 esp, 0xc

    condition:
        7 of them and filesize < 221184
}
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