SYMBOLCOMMON_NAMEaka. SYNONYMS
win.flowershop (Back to overview)

FlowerShop


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References
2019-04-09Chronicle SecurityJuan Andrés Guerrero-Saade, Silas Cutler
@techreport{guerrerosaade:20190409:oldest:062ea25, author = {Juan Andrés Guerrero-Saade and Silas Cutler}, title = {{The Oldest Stuxnet Component Dials Up}}, date = {2019-04-09}, institution = {Chronicle Security}, url = {https://storage.googleapis.com/chronicle-research/STUXSHOP%20Stuxnet%20Dials%20In%20.pdf}, language = {English}, urldate = {2019-12-04} } The Oldest Stuxnet Component Dials Up
FlowerShop Stuxnet
2018-03CrySyS LabBoldizsar Bencsath
@techreport{bencsath:201803:territorial:04343bb, author = {Boldizsar Bencsath}, title = {{Territorial Dispute – NSA’s perspective on APT landscape}}, date = {2018-03}, institution = {CrySyS Lab}, url = {https://www.crysys.hu/publications/files/tedi/ukatemicrysys_territorialdispute.pdf}, language = {English}, urldate = {2020-05-07} } Territorial Dispute – NSA’s perspective on APT landscape
9002 RAT Agent.BTZ DuQu EYService Flame FlowerShop Stuxnet Uroburos
Yara Rules
[TLP:WHITE] win_flowershop_auto (20201023 | autogenerated rule brought to you by yara-signator)
rule win_flowershop_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.flowershop"
        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 = { 33c0 39450c 8945f8 8945fc 7640 53 56 }
            // n = 7, score = 500
            //   33c0                 | xor                 eax, eax
            //   39450c               | cmp                 dword ptr [ebp + 0xc], eax
            //   8945f8               | mov                 dword ptr [ebp - 8], eax
            //   8945fc               | mov                 dword ptr [ebp - 4], eax
            //   7640                 | jbe                 0x42
            //   53                   | push                ebx
            //   56                   | push                esi

        $sequence_1 = { 8d0488 50 e8???????? 59 83f801 59 7474 }
            // n = 7, score = 500
            //   8d0488               | lea                 eax, [eax + ecx*4]
            //   50                   | push                eax
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   83f801               | cmp                 eax, 1
            //   59                   | pop                 ecx
            //   7474                 | je                  0x76

        $sequence_2 = { 83e800 59 7456 48 7522 8d85f8fdffff 6804010000 }
            // n = 7, score = 500
            //   83e800               | sub                 eax, 0
            //   59                   | pop                 ecx
            //   7456                 | je                  0x58
            //   48                   | dec                 eax
            //   7522                 | jne                 0x24
            //   8d85f8fdffff         | lea                 eax, [ebp - 0x208]
            //   6804010000           | push                0x104

        $sequence_3 = { 8d4590 50 6a01 e8???????? 83c438 3bc3 }
            // n = 6, score = 500
            //   8d4590               | lea                 eax, [ebp - 0x70]
            //   50                   | push                eax
            //   6a01                 | push                1
            //   e8????????           |                     
            //   83c438               | add                 esp, 0x38
            //   3bc3                 | cmp                 eax, ebx

        $sequence_4 = { 8d45f4 ff75fc 50 e8???????? 8b45fc 6a04 }
            // n = 6, score = 500
            //   8d45f4               | lea                 eax, [ebp - 0xc]
            //   ff75fc               | push                dword ptr [ebp - 4]
            //   50                   | push                eax
            //   e8????????           |                     
            //   8b45fc               | mov                 eax, dword ptr [ebp - 4]
            //   6a04                 | push                4

        $sequence_5 = { 894508 0fb606 8bc8 6a08 c1e903 99 8d7c0df8 }
            // n = 7, score = 500
            //   894508               | mov                 dword ptr [ebp + 8], eax
            //   0fb606               | movzx               eax, byte ptr [esi]
            //   8bc8                 | mov                 ecx, eax
            //   6a08                 | push                8
            //   c1e903               | shr                 ecx, 3
            //   99                   | cdq                 
            //   8d7c0df8             | lea                 edi, [ebp + ecx - 8]

        $sequence_6 = { 399ec8110000 7416 c7863812000001000000 56 e8???????? 59 e9???????? }
            // n = 7, score = 500
            //   399ec8110000         | cmp                 dword ptr [esi + 0x11c8], ebx
            //   7416                 | je                  0x18
            //   c7863812000001000000     | mov    dword ptr [esi + 0x1238], 1
            //   56                   | push                esi
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   e9????????           |                     

        $sequence_7 = { 57 bf???????? 03c7 50 53 ffd6 8945fc }
            // n = 7, score = 500
            //   57                   | push                edi
            //   bf????????           |                     
            //   03c7                 | add                 eax, edi
            //   50                   | push                eax
            //   53                   | push                ebx
            //   ffd6                 | call                esi
            //   8945fc               | mov                 dword ptr [ebp - 4], eax

        $sequence_8 = { a3???????? 8b44240c a3???????? c3 8b442410 8b0d???????? 8908 }
            // n = 7, score = 500
            //   a3????????           |                     
            //   8b44240c             | mov                 eax, dword ptr [esp + 0xc]
            //   a3????????           |                     
            //   c3                   | ret                 
            //   8b442410             | mov                 eax, dword ptr [esp + 0x10]
            //   8b0d????????         |                     
            //   8908                 | mov                 dword ptr [eax], ecx

        $sequence_9 = { 8b4510 8998c0110000 8b4510 051c120000 50 ff15???????? 53 }
            // n = 7, score = 500
            //   8b4510               | mov                 eax, dword ptr [ebp + 0x10]
            //   8998c0110000         | mov                 dword ptr [eax + 0x11c0], ebx
            //   8b4510               | mov                 eax, dword ptr [ebp + 0x10]
            //   051c120000           | add                 eax, 0x121c
            //   50                   | push                eax
            //   ff15????????         |                     
            //   53                   | push                ebx

    condition:
        7 of them and filesize < 829440
}
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