SYMBOLCOMMON_NAMEaka. SYNONYMS
win.crat (Back to overview)

CRAT

Actor(s): Lazarus Group


According to Cisco Talos, CRAT is a remote access trojan with plugin capabilites, used by Lazarus since at least May 2020.

References
2020-12-21Cisco TalosJON MUNSHAW
@online{munshaw:20201221:2020:4a88f84, author = {JON MUNSHAW}, title = {{2020: The year in malware}}, date = {2020-12-21}, organization = {Cisco Talos}, url = {https://blog.talosintelligence.com/2020/12/2020-year-in-malware.html}, language = {English}, urldate = {2020-12-26} } 2020: The year in malware
WolfRAT Prometei Poet RAT Agent Tesla Astaroth Ave Maria CRAT Emotet Gozi IndigoDrop JhoneRAT Nanocore RAT NjRAT Oblique RAT SmokeLoader StrongPity WastedLocker Zloader
2020-11-12TalosAsheer Malhotra
@online{malhotra:20201112:crat:1761f4e, author = {Asheer Malhotra}, title = {{CRAT wants to plunder your endpoints}}, date = {2020-11-12}, organization = {Talos}, url = {https://blog.talosintelligence.com/2020/11/crat-and-plugins.html}, language = {English}, urldate = {2020-11-18} } CRAT wants to plunder your endpoints
CRAT
2020-09-16QianxinRed Raindrop Team
@online{team:20200916:target:a21c14d, author = {Red Raindrop Team}, title = {{Target defense industry: Lazarus uses recruitment bait combined with continuously updated cyber weapons}}, date = {2020-09-16}, organization = {Qianxin}, url = {https://mp.weixin.qq.com/s/2sV-DrleHiJMSpSCW0kAMg}, language = {English}, urldate = {2021-01-27} } Target defense industry: Lazarus uses recruitment bait combined with continuously updated cyber weapons
CRAT
2020-04-14QianxinQi'anxin Threat Intelligence
@online{intelligence:20200414:lazarus:e451b26, author = {Qi'anxin Threat Intelligence}, title = {{The Lazarus APT organization uses the new crown epidemic bait to target a targeted attack analysis of a country}}, date = {2020-04-14}, organization = {Qianxin}, url = {https://www.secrss.com/articles/18635}, language = {Chinese}, urldate = {2021-04-06} } The Lazarus APT organization uses the new crown epidemic bait to target a targeted attack analysis of a country
CRAT
2020-04-09suspected.tistory.comhmkang92
@online{hmkang92:20200409:malware:ba76407, author = {hmkang92}, title = {{Malware analysis (Emergency inquiry for Coronavirus response in Jeollanam-do.hwp)}}, date = {2020-04-09}, organization = {suspected.tistory.com}, url = {https://suspected.tistory.com/269}, language = {Korean}, urldate = {2021-04-06} } Malware analysis (Emergency inquiry for Coronavirus response in Jeollanam-do.hwp)
CRAT
Yara Rules
[TLP:WHITE] win_crat_auto (20220411 | Detects win.crat.)
rule win_crat_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-04-08"
        version = "1"
        description = "Detects win.crat."
        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.crat"
        malpedia_rule_date = "20220405"
        malpedia_hash = "ecd38294bd47d5589be5cd5490dc8bb4804afc2a"
        malpedia_version = "20220411"
        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 = { 498bc4 48833d????????10 480f4305???????? 482bc8 }
            // n = 4, score = 500
            //   498bc4               | lea                 ecx, dword ptr [ebp - 8]
            //   48833d????????10     |                     
            //   480f4305????????     |                     
            //   482bc8               | nop                 

        $sequence_1 = { e8???????? 488bd0 488d8d00010000 e8???????? 90 }
            // n = 5, score = 500
            //   e8????????           |                     
            //   488bd0               | dec                 eax
            //   488d8d00010000       | mov                 edx, eax
            //   e8????????           |                     
            //   90                   | dec                 eax

        $sequence_2 = { 48f7c20000ffff 7523 0fb7fa 8bcf e8???????? 4885c0 7427 }
            // n = 7, score = 500
            //   48f7c20000ffff       | dec                 eax
            //   7523                 | lea                 ecx, dword ptr [ebp + 0x168]
            //   0fb7fa               | nop                 
            //   8bcf                 | dec                 eax
            //   e8????????           |                     
            //   4885c0               | mov                 edx, eax
            //   7427                 | dec                 eax

        $sequence_3 = { e8???????? 488bc8 4885c0 7433 }
            // n = 4, score = 500
            //   e8????????           |                     
            //   488bc8               | dec                 eax
            //   4885c0               | mov                 edx, eax
            //   7433                 | dec                 eax

        $sequence_4 = { 488bd0 488d8d68010000 e8???????? 90 }
            // n = 4, score = 500
            //   488bd0               | lea                 ecx, dword ptr [ebp + 0x188]
            //   488d8d68010000       | dec                 eax
            //   e8????????           |                     
            //   90                   | mov                 ecx, eax

        $sequence_5 = { e8???????? 488bd0 488d8d88010000 e8???????? }
            // n = 4, score = 500
            //   e8????????           |                     
            //   488bd0               | lea                 ecx, dword ptr [ebp + 0x100]
            //   488d8d88010000       | nop                 
            //   e8????????           |                     

        $sequence_6 = { e8???????? 488bd0 488d8de8000000 e8???????? }
            // n = 4, score = 500
            //   e8????????           |                     
            //   488bd0               | dec                 eax
            //   488d8de8000000       | mov                 edx, eax
            //   e8????????           |                     

        $sequence_7 = { e8???????? 488bd0 488d4df8 e8???????? 90 }
            // n = 5, score = 500
            //   e8????????           |                     
            //   488bd0               | dec                 eax
            //   488d4df8             | test                eax, eax
            //   e8????????           |                     
            //   90                   | je                  0x35

        $sequence_8 = { 33d2 c1e902 f7f1 eb02 }
            // n = 4, score = 300
            //   33d2                 | jmp                 0x30
            //   c1e902               | cmp                 byte ptr [ebp - 0x1f], 0
            //   f7f1                 | je                  0x14
            //   eb02                 | push                dword ptr [ebp - 0x24]

        $sequence_9 = { ffd0 85c0 750f ff15???????? 83f87a }
            // n = 5, score = 300
            //   ffd0                 | jne                 0x2c
            //   85c0                 | movzx               edi, dx
            //   750f                 | mov                 ecx, edi
            //   ff15????????         |                     
            //   83f87a               | dec                 eax

        $sequence_10 = { ff75fc 8bcf 33db 56 }
            // n = 4, score = 200
            //   ff75fc               | jmp                 0x30
            //   8bcf                 | cmp                 byte ptr [ebp - 0x1f], 0
            //   33db                 | push                dword ptr [ebp - 0x28]
            //   56                   | jmp                 0x30

        $sequence_11 = { ff7508 57 6a00 ff750c }
            // n = 4, score = 200
            //   ff7508               | push                esi
            //   57                   | push                dword ptr [ebp - 0x24]
            //   6a00                 | push                dword ptr [ebp - 0x28]
            //   ff750c               | jmp                 0x33

        $sequence_12 = { ff75a4 c745a800000000 e8???????? 83c408 c745a400000000 eb0e }
            // n = 6, score = 200
            //   ff75a4               | mov                 eax, esp
            //   c745a800000000       | dec                 eax
            //   e8????????           |                     
            //   83c408               | sub                 ecx, eax
            //   c745a400000000       | dec                 eax
            //   eb0e                 | mov                 edx, eax

        $sequence_13 = { ff7720 e8???????? ff771c e8???????? }
            // n = 4, score = 200
            //   ff7720               | push                esi
            //   e8????????           |                     
            //   ff771c               | cmp                 dword ptr [edi + 0x18], 0
            //   e8????????           |                     

        $sequence_14 = { ff75d8 e8???????? eb2e 807de100 }
            // n = 4, score = 200
            //   ff75d8               | lea                 ecx, dword ptr [ebp + 0x150]
            //   e8????????           |                     
            //   eb2e                 | nop                 
            //   807de100             | call                eax

        $sequence_15 = { ff75fc 8bcf 56 e8???????? 837f1800 }
            // n = 5, score = 200
            //   ff75fc               | jmp                 0x33
            //   8bcf                 | push                dword ptr [ebp - 4]
            //   56                   | mov                 ecx, edi
            //   e8????????           |                     
            //   837f1800             | xor                 ebx, ebx

        $sequence_16 = { ff7508 56 e8???????? 8b450c 83c40c }
            // n = 5, score = 200
            //   ff7508               | mov                 ecx, edi
            //   56                   | push                esi
            //   e8????????           |                     
            //   8b450c               | cmp                 dword ptr [edi + 0x18], 0
            //   83c40c               | jne                 0x82

    condition:
        7 of them and filesize < 4161536
}
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