SYMBOLCOMMON_NAMEaka. SYNONYMS
win.flying_dutchman (Back to overview)

FlyingDutchman

Actor(s): Calypso group


There is no description at this point.

References
2019-10-31PTSecurityPTSecurity
@online{ptsecurity:20191031:calypso:adaf761, author = {PTSecurity}, title = {{Calypso APT: new group attacking state institutions}}, date = {2019-10-31}, organization = {PTSecurity}, url = {https://www.ptsecurity.com/ww-en/analytics/calypso-apt-2019/}, language = {English}, urldate = {2020-01-12} } Calypso APT: new group attacking state institutions
BYEBY FlyingDutchman Hussar PlugX
Yara Rules
[TLP:WHITE] win_flying_dutchman_auto (20201014 | autogenerated rule brought to you by yara-signator)
rule win_flying_dutchman_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.flying_dutchman"
        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 = { 8b7dfc 50 e8???????? 8bf8 }
            // n = 4, score = 100
            //   8b7dfc               | mov                 edi, dword ptr [ebp - 4]
            //   50                   | push                eax
            //   e8????????           |                     
            //   8bf8                 | mov                 edi, eax

        $sequence_1 = { 33c0 8b4d08 3b0cc5e06c0110 740a 40 }
            // n = 5, score = 100
            //   33c0                 | xor                 eax, eax
            //   8b4d08               | mov                 ecx, dword ptr [ebp + 8]
            //   3b0cc5e06c0110       | cmp                 ecx, dword ptr [eax*8 + 0x10016ce0]
            //   740a                 | je                  0xc
            //   40                   | inc                 eax

        $sequence_2 = { b984000000 8bf8 f3a5 81430410020000 5f 5e }
            // n = 6, score = 100
            //   b984000000           | mov                 ecx, 0x84
            //   8bf8                 | mov                 edi, eax
            //   f3a5                 | rep movsd           dword ptr es:[edi], dword ptr [esi]
            //   81430410020000       | add                 dword ptr [ebx + 4], 0x210
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi

        $sequence_3 = { 51 51 56 6a18 e8???????? 59 33c9 }
            // n = 7, score = 100
            //   51                   | push                ecx
            //   51                   | push                ecx
            //   56                   | push                esi
            //   6a18                 | push                0x18
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   33c9                 | xor                 ecx, ecx

        $sequence_4 = { 6a64 8bc1 5f f7f7 894df4 8bf8 8955f8 }
            // n = 7, score = 100
            //   6a64                 | push                0x64
            //   8bc1                 | mov                 eax, ecx
            //   5f                   | pop                 edi
            //   f7f7                 | div                 edi
            //   894df4               | mov                 dword ptr [ebp - 0xc], ecx
            //   8bf8                 | mov                 edi, eax
            //   8955f8               | mov                 dword ptr [ebp - 8], edx

        $sequence_5 = { eb60 6a59 ffd7 85c0 7458 b8???????? 8d9690010000 }
            // n = 7, score = 100
            //   eb60                 | jmp                 0x62
            //   6a59                 | push                0x59
            //   ffd7                 | call                edi
            //   85c0                 | test                eax, eax
            //   7458                 | je                  0x5a
            //   b8????????           |                     
            //   8d9690010000         | lea                 edx, [esi + 0x190]

        $sequence_6 = { 8d8534ffffff ff7604 50 e8???????? }
            // n = 4, score = 100
            //   8d8534ffffff         | lea                 eax, [ebp - 0xcc]
            //   ff7604               | push                dword ptr [esi + 4]
            //   50                   | push                eax
            //   e8????????           |                     

        $sequence_7 = { 6aff 895910 53 8bc6 8819 e8???????? }
            // n = 6, score = 100
            //   6aff                 | push                -1
            //   895910               | mov                 dword ptr [ecx + 0x10], ebx
            //   53                   | push                ebx
            //   8bc6                 | mov                 eax, esi
            //   8819                 | mov                 byte ptr [ecx], bl
            //   e8????????           |                     

        $sequence_8 = { ff75d8 e8???????? 59 893e b001 8b4dfc }
            // n = 6, score = 100
            //   ff75d8               | push                dword ptr [ebp - 0x28]
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   893e                 | mov                 dword ptr [esi], edi
            //   b001                 | mov                 al, 1
            //   8b4dfc               | mov                 ecx, dword ptr [ebp - 4]

        $sequence_9 = { 0f8699000000 8d4702 898530ffffff 8a043e 3c23 756f 38443e01 }
            // n = 7, score = 100
            //   0f8699000000         | jbe                 0x9f
            //   8d4702               | lea                 eax, [edi + 2]
            //   898530ffffff         | mov                 dword ptr [ebp - 0xd0], eax
            //   8a043e               | mov                 al, byte ptr [esi + edi]
            //   3c23                 | cmp                 al, 0x23
            //   756f                 | jne                 0x71
            //   38443e01             | cmp                 byte ptr [esi + edi + 1], al

    condition:
        7 of them and filesize < 276480
}
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