SYMBOLCOMMON_NAMEaka. SYNONYMS
win.tellyouthepass (Back to overview)

TellYouThePass


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References
2022-01-11CrowdStrikeAnmol Maurya
@online{maurya:20220111:tellyouthepass:b31fcb8, author = {Anmol Maurya}, title = {{TellYouThePass Ransomware Analysis Reveals a Modern Reinterpretation Using Golang}}, date = {2022-01-11}, organization = {CrowdStrike}, url = {https://www.crowdstrike.com/blog/tellyouthepass-ransomware-analysis-reveals-modern-reinterpretation-using-golang/}, language = {English}, urldate = {2022-01-18} } TellYouThePass Ransomware Analysis Reveals a Modern Reinterpretation Using Golang
TellYouThePass
2021-12-23SymantecSiddhesh Chandrayan
@online{chandrayan:20211223:log4j:58ea562, author = {Siddhesh Chandrayan}, title = {{Log4j Vulnerabilities: Attack Insights}}, date = {2021-12-23}, organization = {Symantec}, url = {https://symantec-enterprise-blogs.security.com/blogs/threat-intelligence/log4j-vulnerabilities-attacks}, language = {English}, urldate = {2022-01-25} } Log4j Vulnerabilities: Attack Insights
Tsunami Conti Dridex Khonsari Orcus RAT TellYouThePass
Yara Rules
[TLP:WHITE] win_tellyouthepass_auto (20220411 | Detects win.tellyouthepass.)
rule win_tellyouthepass_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-04-08"
        version = "1"
        description = "Detects win.tellyouthepass."
        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.tellyouthepass"
        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 = { 750b 488b542438 f0480fc15020 488d05ff013300 e8???????? 488b7c2420 488b5f18 }
            // n = 7, score = 100
            //   750b                 | dec                 esp
            //   488b542438           | mov                 eax, dword ptr [esp + 0xd0]
            //   f0480fc15020         | dec                 ecx
            //   488d05ff013300       | mov                 ecx, eax
            //   e8????????           |                     
            //   488b7c2420           | dec                 esp
            //   488b5f18             | mov                 eax, eax

        $sequence_1 = { 7f11 488b9c24a0000000 4c39e3 0f8d0bffffff 488d0dd3060c00 48898c24c0000000 48c78424c800000012000000 }
            // n = 7, score = 100
            //   7f11                 | mov                 ebx, dword ptr [esp + 0x20]
            //   488b9c24a0000000     | dec                 eax
            //   4c39e3               | lea                 ecx, dword ptr [0x9984b]
            //   0f8d0bffffff         | mov                 edi, 5
            //   488d0dd3060c00       | dec                 eax
            //   48898c24c0000000     | mov                 dword ptr [eax], 0x8f
            //   48c78424c800000012000000     | dec    eax

        $sequence_2 = { e8???????? 4889442450 4889c3 4889d9 488d0542fe1200 6690 e8???????? }
            // n = 7, score = 100
            //   e8????????           |                     
            //   4889442450           | dec                 ecx
            //   4889c3               | cmp                 dword ptr [eax], edx
            //   4889d9               | jne                 0x2eb
            //   488d0542fe1200       | dec                 eax
            //   6690                 | mov                 eax, dword ptr [esp + 0x60]
            //   e8????????           |                     

        $sequence_3 = { 4889d9 4889c3 488b442458 48894c2438 48895c2440 488b5040 488b4048 }
            // n = 7, score = 100
            //   4889d9               | sar                 esi, 0x3f
            //   4889c3               | dec                 eax
            //   488b442458           | and                 esi, 0x12
            //   48894c2438           | dec                 esp
            //   48895c2440           | mov                 eax, dword ptr [esp + 0x58]
            //   488b5040             | jb                  0x754
            //   488b4048             | dec                 eax

        $sequence_4 = { ffd6 488b542450 488b7230 488b4238 488b5630 488b5c2438 488b4c2460 }
            // n = 7, score = 100
            //   ffd6                 | mov                 ebx, edx
            //   488b542450           | dec                 ecx
            //   488b7230             | mov                 esp, esi
            //   488b4238             | dec                 eax
            //   488b5630             | mov                 edx, dword ptr [esp + 0x1e0]
            //   488b5c2438           | dec                 esp
            //   488b4c2460           | mov                 eax, dword ptr [esp + 0x50]

        $sequence_5 = { 84c0 740d 488b842428010000 e9???????? 48baffffffffffffff7f 4839d7 776b }
            // n = 7, score = 100
            //   84c0                 | mov                 ebx, eax
            //   740d                 | dec                 eax
            //   488b842428010000     | mov                 ecx, dword ptr [esp + 0x50]
            //   e9????????           |                     
            //   48baffffffffffffff7f     | dec    eax
            //   4839d7               | lea                 eax, dword ptr [0x19a4a9]
            //   776b                 | mov                 ebx, 7

        $sequence_6 = { e8???????? 48c7400817000000 488d0d407a1000 488908 48c7401000000000 4889c3 488d0577970d00 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   48c7400817000000     | mov                 dword ptr [eax + ecx], eax
            //   488d0d407a1000       | jmp                 0xa3
            //   488908               | dec                 eax
            //   48c7401000000000     | mov                 ebp, dword ptr [esp + 0xe0]
            //   4889c3               | dec                 eax
            //   488d0577970d00       | add                 esp, 0xe8

        $sequence_7 = { 4c89da 48899c24f0000000 4c899424a8010000 48898c2430010000 48899424b8010000 4c898c24f8000000 0f1002 }
            // n = 7, score = 100
            //   4c89da               | mov                 esi, dword ptr [esp + 0x30]
            //   48899c24f0000000     | dec                 eax
            //   4c899424a8010000     | mov                 edi, dword ptr [esp + 0x28]
            //   48898c2430010000     | dec                 esp
            //   48899424b8010000     | mov                 eax, dword ptr [esp + 0x38]
            //   4c898c24f8000000     | dec                 esp
            //   0f1002               | mov                 ecx, dword ptr [esp + 0x80]

        $sequence_8 = { 7669 4883ec18 48896c2410 488d6c2410 488d0565a90a00 0f1f440000 e8???????? }
            // n = 7, score = 100
            //   7669                 | dec                 eax
            //   4883ec18             | lea                 eax, dword ptr [0x112c45]
            //   48896c2410           | nop                 dword ptr [eax + eax]
            //   488d6c2410           | jne                 0x5f9
            //   488d0565a90a00       | dec                 eax
            //   0f1f440000           | mov                 ecx, dword ptr [esp + 0x98]
            //   e8????????           |                     

        $sequence_9 = { 4901cf 660f1f840000000000 0f1f00 4981ff00020000 0f8348010000 4e8bbcfe00000200 458b5758 }
            // n = 7, score = 100
            //   4901cf               | lea                 ebx, dword ptr [0x11bd1a]
            //   660f1f840000000000     | nop    
            //   0f1f00               | dec                 eax
            //   4981ff00020000       | mov                 edx, ecx
            //   0f8348010000         | dec                 eax
            //   4e8bbcfe00000200     | mov                 ecx, ebx
            //   458b5758             | dec                 eax

    condition:
        7 of them and filesize < 7152640
}
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