SYMBOLCOMMON_NAMEaka. SYNONYMS
win.targetcompany (Back to overview)

TargetCompany

aka: Tohnichi

This ransomware uses a combination of different crypto algorithms (ChaCha20, AES-128, Curve25519). The activity of this malware is dated to mid-June 2021. The extension of the encrypted files are set to the compromised company: .<target_company>
A decryptor was released on 2022-02-07 by AVAST

References
2022-02-07Bleeping ComputerSergiu Gatlan
@online{gatlan:20220207:free:98f37bd, author = {Sergiu Gatlan}, title = {{Free decryptor released for TargetCompany ransomware victims}}, date = {2022-02-07}, organization = {Bleeping Computer}, url = {https://www.bleepingcomputer.com/news/security/free-decryptor-released-for-targetcompany-ransomware-victims/}, language = {English}, urldate = {2022-02-19} } Free decryptor released for TargetCompany ransomware victims
TargetCompany
2022-02-07Avast DecodedAvast Threat Research Team
@online{team:20220207:decrypted:f204a1f, author = {Avast Threat Research Team}, title = {{Decrypted: TargetCompany Ransomware}}, date = {2022-02-07}, organization = {Avast Decoded}, url = {https://decoded.avast.io/threatresearch/decrypted-targetcompany-ransomware/}, language = {English}, urldate = {2022-02-10} } Decrypted: TargetCompany Ransomware
TargetCompany
2022-02-07SecurityAffairsPierluigi Paganini
@online{paganini:20220207:avast:12bb4e5, author = {Pierluigi Paganini}, title = {{Avast released a free decryptor for TargetCompany ransomware}}, date = {2022-02-07}, organization = {SecurityAffairs}, url = {https://securityaffairs.co/wordpress/127761/malware/targetcompany-ransomware-decryptor.html}, language = {English}, urldate = {2022-02-10} } Avast released a free decryptor for TargetCompany ransomware
TargetCompany
2021-06-15ID RansomwareAndrew Ivanov
@online{ivanov:20210615:targetcompany:3c62eb6, author = {Andrew Ivanov}, title = {{TargetCompany Ransomware}}, date = {2021-06-15}, organization = {ID Ransomware}, url = {https://id-ransomware.blogspot.com/2021/06/tohnichi-ransomware.html}, language = {Russian}, urldate = {2022-02-10} } TargetCompany Ransomware
TargetCompany
Yara Rules
[TLP:WHITE] win_targetcompany_auto (20221125 | Detects win.targetcompany.)
rule win_targetcompany_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-11-21"
        version = "1"
        description = "Detects win.targetcompany."
        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.targetcompany"
        malpedia_rule_date = "20221118"
        malpedia_hash = "e0702e2e6d1d00da65c8a29a4ebacd0a4c59e1af"
        malpedia_version = "20221125"
        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 = { 037dd8 c1c60c 0175c4 3355c4 014dbc c1c208 0155e4 }
            // n = 7, score = 500
            //   037dd8               | add                 edi, dword ptr [ebp - 0x28]
            //   c1c60c               | rol                 esi, 0xc
            //   0175c4               | add                 dword ptr [ebp - 0x3c], esi
            //   3355c4               | xor                 edx, dword ptr [ebp - 0x3c]
            //   014dbc               | add                 dword ptr [ebp - 0x44], ecx
            //   c1c208               | rol                 edx, 8
            //   0155e4               | add                 dword ptr [ebp - 0x1c], edx

        $sequence_1 = { 8b4508 83c10c e8???????? 84c0 746d 33c0 c745dc07000000 }
            // n = 7, score = 500
            //   8b4508               | mov                 eax, dword ptr [ebp + 8]
            //   83c10c               | add                 ecx, 0xc
            //   e8????????           |                     
            //   84c0                 | test                al, al
            //   746d                 | je                  0x6f
            //   33c0                 | xor                 eax, eax
            //   c745dc07000000       | mov                 dword ptr [ebp - 0x24], 7

        $sequence_2 = { c1c707 c1c610 0175e4 8b5de4 }
            // n = 4, score = 500
            //   c1c707               | rol                 edi, 7
            //   c1c610               | rol                 esi, 0x10
            //   0175e4               | add                 dword ptr [ebp - 0x1c], esi
            //   8b5de4               | mov                 ebx, dword ptr [ebp - 0x1c]

        $sequence_3 = { 68???????? 6804010000 50 ff15???????? a1???????? c685ecdcffff00 }
            // n = 6, score = 500
            //   68????????           |                     
            //   6804010000           | push                0x104
            //   50                   | push                eax
            //   ff15????????         |                     
            //   a1????????           |                     
            //   c685ecdcffff00       | mov                 byte ptr [ebp - 0x2314], 0

        $sequence_4 = { 2bc2 d1f8 56 8bf0 85f6 7e72 }
            // n = 6, score = 500
            //   2bc2                 | sub                 eax, edx
            //   d1f8                 | sar                 eax, 1
            //   56                   | push                esi
            //   8bf0                 | mov                 esi, eax
            //   85f6                 | test                esi, esi
            //   7e72                 | jle                 0x74

        $sequence_5 = { 8bf9 c1ef02 33d7 03c2 }
            // n = 4, score = 500
            //   8bf9                 | mov                 edi, ecx
            //   c1ef02               | shr                 edi, 2
            //   33d7                 | xor                 edx, edi
            //   03c2                 | add                 eax, edx

        $sequence_6 = { 6a00 6a01 8db594fbffff e8???????? 85ff 7407 57 }
            // n = 7, score = 500
            //   6a00                 | push                0
            //   6a01                 | push                1
            //   8db594fbffff         | lea                 esi, [ebp - 0x46c]
            //   e8????????           |                     
            //   85ff                 | test                edi, edi
            //   7407                 | je                  9
            //   57                   | push                edi

        $sequence_7 = { 8d85f4fdffff 50 68???????? 8d8588fbffff 6836010000 50 ff15???????? }
            // n = 7, score = 500
            //   8d85f4fdffff         | lea                 eax, [ebp - 0x20c]
            //   50                   | push                eax
            //   68????????           |                     
            //   8d8588fbffff         | lea                 eax, [ebp - 0x478]
            //   6836010000           | push                0x136
            //   50                   | push                eax
            //   ff15????????         |                     

        $sequence_8 = { 03d1 8bf9 c1ef02 33d7 03c2 03ce }
            // n = 6, score = 500
            //   03d1                 | add                 edx, ecx
            //   8bf9                 | mov                 edi, ecx
            //   c1ef02               | shr                 edi, 2
            //   33d7                 | xor                 edx, edi
            //   03c2                 | add                 eax, edx
            //   03ce                 | add                 ecx, esi

        $sequence_9 = { 740d 2bc1 8a11 4f 881408 41 }
            // n = 6, score = 500
            //   740d                 | je                  0xf
            //   2bc1                 | sub                 eax, ecx
            //   8a11                 | mov                 dl, byte ptr [ecx]
            //   4f                   | dec                 edi
            //   881408               | mov                 byte ptr [eax + ecx], dl
            //   41                   | inc                 ecx

    condition:
        7 of them and filesize < 328704
}
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