SYMBOLCOMMON_NAMEaka. SYNONYMS
win.zerot (Back to overview)

ZeroT


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References
2017-02-02ProofpointDarien Huss, Pierre T, Axel F, Proofpoint Staff
@online{huss:20170202:oops:ea454d5, author = {Darien Huss and Pierre T and Axel F and Proofpoint Staff}, title = {{Oops, they did it again: APT Targets Russia and Belarus with ZeroT and PlugX}}, date = {2017-02-02}, organization = {Proofpoint}, url = {https://www.proofpoint.com/us/threat-insight/post/APT-targets-russia-belarus-zerot-plugx}, language = {English}, urldate = {2019-12-20} } Oops, they did it again: APT Targets Russia and Belarus with ZeroT and PlugX
ZeroT
Yara Rules
[TLP:WHITE] win_zerot_auto (20220808 | Detects win.zerot.)
rule win_zerot_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-08-05"
        version = "1"
        description = "Detects win.zerot."
        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.zerot"
        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 = { e8???????? 83c404 33f6 eb13 6800006000 e8???????? }
            // n = 6, score = 200
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   33f6                 | xor                 esi, esi
            //   eb13                 | jmp                 0x15
            //   6800006000           | push                0x600000
            //   e8????????           |                     

        $sequence_1 = { ffd3 c7460400000000 8b460c 85c0 740a }
            // n = 5, score = 200
            //   ffd3                 | call                ebx
            //   c7460400000000       | mov                 dword ptr [esi + 4], 0
            //   8b460c               | mov                 eax, dword ptr [esi + 0xc]
            //   85c0                 | test                eax, eax
            //   740a                 | je                  0xc

        $sequence_2 = { a1???????? 8985acfeffff a0???????? 0f11857cfeffff 68cb000000 }
            // n = 5, score = 200
            //   a1????????           |                     
            //   8985acfeffff         | mov                 dword ptr [ebp - 0x154], eax
            //   a0????????           |                     
            //   0f11857cfeffff       | movups              xmmword ptr [ebp - 0x184], xmm0
            //   68cb000000           | push                0xcb

        $sequence_3 = { ffb534f6ffff 8d853cfeffff 68???????? 50 e8???????? 83c418 }
            // n = 6, score = 200
            //   ffb534f6ffff         | push                dword ptr [ebp - 0x9cc]
            //   8d853cfeffff         | lea                 eax, [ebp - 0x1c4]
            //   68????????           |                     
            //   50                   | push                eax
            //   e8????????           |                     
            //   83c418               | add                 esp, 0x18

        $sequence_4 = { 6800080000 8d857cf6ffff 6a00 50 e8???????? 0f1005???????? }
            // n = 6, score = 200
            //   6800080000           | push                0x800
            //   8d857cf6ffff         | lea                 eax, [ebp - 0x984]
            //   6a00                 | push                0
            //   50                   | push                eax
            //   e8????????           |                     
            //   0f1005????????       |                     

        $sequence_5 = { 8b55e8 c6043200 8d7f08 8a47f6 }
            // n = 4, score = 200
            //   8b55e8               | mov                 edx, dword ptr [ebp - 0x18]
            //   c6043200             | mov                 byte ptr [edx + esi], 0
            //   8d7f08               | lea                 edi, [edi + 8]
            //   8a47f6               | mov                 al, byte ptr [edi - 0xa]

        $sequence_6 = { 83c202 660f1f440000 8b460c 8d5204 0fb644082a c0e803 2401 }
            // n = 7, score = 200
            //   83c202               | add                 edx, 2
            //   660f1f440000         | nop                 word ptr [eax + eax]
            //   8b460c               | mov                 eax, dword ptr [esi + 0xc]
            //   8d5204               | lea                 edx, [edx + 4]
            //   0fb644082a           | movzx               eax, byte ptr [eax + ecx + 0x2a]
            //   c0e803               | shr                 al, 3
            //   2401                 | and                 al, 1

        $sequence_7 = { c645fb00 0f1145e5 0f1145d4 83e802 7416 8d45e4 }
            // n = 6, score = 200
            //   c645fb00             | mov                 byte ptr [ebp - 5], 0
            //   0f1145e5             | movups              xmmword ptr [ebp - 0x1b], xmm0
            //   0f1145d4             | movups              xmmword ptr [ebp - 0x2c], xmm0
            //   83e802               | sub                 eax, 2
            //   7416                 | je                  0x18
            //   8d45e4               | lea                 eax, [ebp - 0x1c]

        $sequence_8 = { 6a40 2bcf 8d85d4feffff 50 8d4101 50 }
            // n = 6, score = 200
            //   6a40                 | push                0x40
            //   2bcf                 | sub                 ecx, edi
            //   8d85d4feffff         | lea                 eax, [ebp - 0x12c]
            //   50                   | push                eax
            //   8d4101               | lea                 eax, [ecx + 1]
            //   50                   | push                eax

        $sequence_9 = { 740a 51 ffd3 c7460c00000000 b801000000 5f 5e }
            // n = 7, score = 200
            //   740a                 | je                  0xc
            //   51                   | push                ecx
            //   ffd3                 | call                ebx
            //   c7460c00000000       | mov                 dword ptr [esi + 0xc], 0
            //   b801000000           | mov                 eax, 1
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi

    condition:
        7 of them and filesize < 303104
}
[TLP:WHITE] win_zerot_w0   (20180301 | Detects malware from the Proofpoint CN APT ZeroT incident)
rule win_zerot_w0 {
    meta:
        description = "Detects malware from the Proofpoint CN APT ZeroT incident"
        author = "Florian Roth"
        reference = "https://www.proofpoint.com/us/threat-insight/post/APT-targets-russia-belarus-zerot-plugx"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.zerot"
        malpedia_version = "20180301"
        malpedia_license = "CC BY-NC-SA 4.0"
        malpedia_sharing = "TLP:WHITE"
    strings:
        $s6 = "jGetgQ|0h9=" fullword ascii
    condition:
        ( 10 of ($s*) ) or ( all of them )
}
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