SYMBOLCOMMON_NAMEaka. SYNONYMS
win.flashflood (Back to overview)

FLASHFLOOD

Actor(s): APT 30


FLASHFLOOD will scan inserted removable drives for targeted files, and copy those files from the
removable drive to the FLASHFLOOD-infected system. FLASHFLOOD may also log or copy additional data from the victim computer, such as system information
or contacts.

References
2015-04FireEyeFireEye
@techreport{fireeye:201504:apt30:0129bf7, author = {FireEye}, title = {{APT30 AND THE MECHANICS OF A LONG-RUNNING CYBER ESPIONAGE OPERATION}}, date = {2015-04}, institution = {FireEye}, url = {https://www2.fireeye.com/rs/fireye/images/rpt-apt30.pdf}, language = {English}, urldate = {2020-01-07} } APT30 AND THE MECHANICS OF A LONG-RUNNING CYBER ESPIONAGE OPERATION
BACKBEND backspace CREAMSICLE FLASHFLOOD GEMCUTTER MILKMAID Naikon NETEAGLE ORANGEADE SHIPSHAPE SPACESHIP SslMM Sys10 WinMM xsPlus APT 30
Yara Rules
[TLP:WHITE] win_flashflood_auto (20201023 | autogenerated rule brought to you by yara-signator)
rule win_flashflood_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.flashflood"
        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 = { 59 59 5e c3 55 8bec 81ecc40a0000 }
            // n = 7, score = 100
            //   59                   | pop                 ecx
            //   59                   | pop                 ecx
            //   5e                   | pop                 esi
            //   c3                   | ret                 
            //   55                   | push                ebp
            //   8bec                 | mov                 ebp, esp
            //   81ecc40a0000         | sub                 esp, 0xac4

        $sequence_1 = { 6bd20c 33c0 668b82ee914000 8b4df8 894174 }
            // n = 5, score = 100
            //   6bd20c               | imul                edx, edx, 0xc
            //   33c0                 | xor                 eax, eax
            //   668b82ee914000       | mov                 ax, word ptr [edx + 0x4091ee]
            //   8b4df8               | mov                 ecx, dword ptr [ebp - 8]
            //   894174               | mov                 dword ptr [ecx + 0x74], eax

        $sequence_2 = { 53 50 ff15???????? 8d85f0fcffff }
            // n = 4, score = 100
            //   53                   | push                ebx
            //   50                   | push                eax
            //   ff15????????         |                     
            //   8d85f0fcffff         | lea                 eax, [ebp - 0x310]

        $sequence_3 = { 75a8 56 ff15???????? 5e c9 }
            // n = 5, score = 100
            //   75a8                 | jne                 0xffffffaa
            //   56                   | push                esi
            //   ff15????????         |                     
            //   5e                   | pop                 esi
            //   c9                   | leave               

        $sequence_4 = { 81ec04020000 53 56 57 bb???????? }
            // n = 5, score = 100
            //   81ec04020000         | sub                 esp, 0x204
            //   53                   | push                ebx
            //   56                   | push                esi
            //   57                   | push                edi
            //   bb????????           |                     

        $sequence_5 = { e8???????? 85c0 59 0f84a2010000 8d4598 }
            // n = 5, score = 100
            //   e8????????           |                     
            //   85c0                 | test                eax, eax
            //   59                   | pop                 ecx
            //   0f84a2010000         | je                  0x1a8
            //   8d4598               | lea                 eax, [ebp - 0x68]

        $sequence_6 = { 3c10 7424 8d85e4feffff 50 e8???????? }
            // n = 5, score = 100
            //   3c10                 | cmp                 al, 0x10
            //   7424                 | je                  0x26
            //   8d85e4feffff         | lea                 eax, [ebp - 0x11c]
            //   50                   | push                eax
            //   e8????????           |                     

        $sequence_7 = { 53 ffd7 6a00 56 ff15???????? 56 }
            // n = 6, score = 100
            //   53                   | push                ebx
            //   ffd7                 | call                edi
            //   6a00                 | push                0
            //   56                   | push                esi
            //   ff15????????         |                     
            //   56                   | push                esi

        $sequence_8 = { 50 e8???????? 85c0 59 743d eb24 8d85c0feffff }
            // n = 7, score = 100
            //   50                   | push                eax
            //   e8????????           |                     
            //   85c0                 | test                eax, eax
            //   59                   | pop                 ecx
            //   743d                 | je                  0x3f
            //   eb24                 | jmp                 0x26
            //   8d85c0feffff         | lea                 eax, [ebp - 0x140]

        $sequence_9 = { 40 8945f8 0fbe06 50 ff15???????? 8bf8 }
            // n = 6, score = 100
            //   40                   | inc                 eax
            //   8945f8               | mov                 dword ptr [ebp - 8], eax
            //   0fbe06               | movsx               eax, byte ptr [esi]
            //   50                   | push                eax
            //   ff15????????         |                     
            //   8bf8                 | mov                 edi, eax

    condition:
        7 of them and filesize < 114688
}
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