SYMBOLCOMMON_NAMEaka. SYNONYMS
win.concealment_troy (Back to overview)

concealment_troy


There is no description at this point.

References
2018-05-03McAfeeRyan Sherstobitoff, Itai Liba, James Walter
@techreport{sherstobitoff:20180503:dissecting:13102f0, author = {Ryan Sherstobitoff and Itai Liba and James Walter}, title = {{Dissecting Operation Troy: Cyberespionage in South Korea}}, date = {2018-05-03}, institution = {McAfee}, url = {https://www.mcafee.com/enterprise/en-us/assets/white-papers/wp-dissecting-operation-troy.pdf}, language = {English}, urldate = {2020-01-10} } Dissecting Operation Troy: Cyberespionage in South Korea
concealment_troy http_troy Lazarus Group
2013-04-24R136a1
@online{r136a1:20130424:south:d6c223e, author = {R136a1}, title = {{South Korea Incident - New Malware samples}}, date = {2013-04-24}, url = {http://www.malware-reversing.com/2013/04/5-south-korea-incident-new-malware.html}, language = {English}, urldate = {2020-01-13} } South Korea Incident - New Malware samples
concealment_troy httpdropper http_troy
Yara Rules
[TLP:WHITE] win_concealment_troy_auto (20220808 | Detects win.concealment_troy.)
rule win_concealment_troy_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-08-05"
        version = "1"
        description = "Detects win.concealment_troy."
        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.concealment_troy"
        malpedia_rule_date = "20220805"
        malpedia_hash = "6ec06c64bcfdbeda64eff021c766b4ce34542b71"
        malpedia_version = "20220808"
        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 = { 837ddc00 75e6 c6460401 830eff 2b34bda0774100 }
            // n = 5, score = 100
            //   837ddc00             | cmp                 dword ptr [ebp - 0x24], 0
            //   75e6                 | jne                 0xffffffe8
            //   c6460401             | mov                 byte ptr [esi + 4], 1
            //   830eff               | or                  dword ptr [esi], 0xffffffff
            //   2b34bda0774100       | sub                 esi, dword ptr [edi*4 + 0x4177a0]

        $sequence_1 = { 8bf1 8d3c85a0774100 8b07 83e61f c1e606 03c6 }
            // n = 6, score = 100
            //   8bf1                 | mov                 esi, ecx
            //   8d3c85a0774100       | lea                 edi, [eax*4 + 0x4177a0]
            //   8b07                 | mov                 eax, dword ptr [edi]
            //   83e61f               | and                 esi, 0x1f
            //   c1e606               | shl                 esi, 6
            //   03c6                 | add                 eax, esi

        $sequence_2 = { 85f6 7455 56 6a0a 33c0 }
            // n = 5, score = 100
            //   85f6                 | test                esi, esi
            //   7455                 | je                  0x57
            //   56                   | push                esi
            //   6a0a                 | push                0xa
            //   33c0                 | xor                 eax, eax

        $sequence_3 = { 2bc2 50 8d4c2414 6a01 51 }
            // n = 5, score = 100
            //   2bc2                 | sub                 eax, edx
            //   50                   | push                eax
            //   8d4c2414             | lea                 ecx, [esp + 0x14]
            //   6a01                 | push                1
            //   51                   | push                ecx

        $sequence_4 = { c684246401000000 e8???????? 83c40c 56 56 68???????? 68???????? }
            // n = 7, score = 100
            //   c684246401000000     | mov                 byte ptr [esp + 0x164], 0
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc
            //   56                   | push                esi
            //   56                   | push                esi
            //   68????????           |                     
            //   68????????           |                     

        $sequence_5 = { 51 e8???????? 8bf0 83c408 85f6 7523 }
            // n = 6, score = 100
            //   51                   | push                ecx
            //   e8????????           |                     
            //   8bf0                 | mov                 esi, eax
            //   83c408               | add                 esp, 8
            //   85f6                 | test                esi, esi
            //   7523                 | jne                 0x25

        $sequence_6 = { 85c0 750f 8d542457 6a2f 52 e8???????? }
            // n = 6, score = 100
            //   85c0                 | test                eax, eax
            //   750f                 | jne                 0x11
            //   8d542457             | lea                 edx, [esp + 0x57]
            //   6a2f                 | push                0x2f
            //   52                   | push                edx
            //   e8????????           |                     

        $sequence_7 = { 895c2421 e8???????? 56 e8???????? 83c414 }
            // n = 5, score = 100
            //   895c2421             | mov                 dword ptr [esp + 0x21], ebx
            //   e8????????           |                     
            //   56                   | push                esi
            //   e8????????           |                     
            //   83c414               | add                 esp, 0x14

        $sequence_8 = { 8945e0 85c0 7461 8d0cbda0774100 8901 8305????????20 8b11 }
            // n = 7, score = 100
            //   8945e0               | mov                 dword ptr [ebp - 0x20], eax
            //   85c0                 | test                eax, eax
            //   7461                 | je                  0x63
            //   8d0cbda0774100       | lea                 ecx, [edi*4 + 0x4177a0]
            //   8901                 | mov                 dword ptr [ecx], eax
            //   8305????????20       |                     
            //   8b11                 | mov                 edx, dword ptr [ecx]

        $sequence_9 = { 55 8b6c243c 56 57 6a27 8d442419 6a00 }
            // n = 7, score = 100
            //   55                   | push                ebp
            //   8b6c243c             | mov                 ebp, dword ptr [esp + 0x3c]
            //   56                   | push                esi
            //   57                   | push                edi
            //   6a27                 | push                0x27
            //   8d442419             | lea                 eax, [esp + 0x19]
            //   6a00                 | push                0

    condition:
        7 of them and filesize < 229376
}
Download all Yara Rules