SYMBOLCOMMON_NAMEaka. SYNONYMS
win.targetcompany (Back to overview)

TargetCompany

aka: Fargo, Mallox, 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
2022-12-08CybleincCyble
@online{cyble:20221208:mallox:99e042a, author = {Cyble}, title = {{Mallox Ransomware showing signs of Increased Activity}}, date = {2022-12-08}, organization = {Cybleinc}, url = {https://blog.cyble.com/2022/12/08/mallox-ransomware-showing-signs-of-increased-activity/}, language = {English}, urldate = {2022-12-19} } Mallox Ransomware showing signs of Increased Activity
TargetCompany
2022-09-23AhnLabASEC
@online{asec:20220923:fargo:35c7da4, author = {ASEC}, title = {{FARGO Ransomware (Mallox) Being Distributed to Unsecured MS-SQL Servers}}, date = {2022-09-23}, organization = {AhnLab}, url = {https://asec.ahnlab.com/en/39152/}, language = {English}, urldate = {2022-12-14} } FARGO Ransomware (Mallox) Being Distributed to Unsecured MS-SQL Servers
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
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
2022-02-07Bleeping 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
2021-11-19SangforSangfor Technologies
@online{technologies:20211119:new:1da2470, author = {Sangfor Technologies}, title = {{The New Threat: Mallox Ransomware}}, date = {2021-11-19}, organization = {Sangfor}, url = {https://www.sangfor.com/blog/cybersecurity/new-threat-mallox-ransomware}, language = {English}, urldate = {2022-12-19} } The New Threat: Mallox 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 (20230125 | Detects win.targetcompany.)
rule win_targetcompany_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-01-25"
        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 = "20230124"
        malpedia_hash = "2ee0eebba83dce3d019a90519f2f972c0fcf9686"
        malpedia_version = "20230125"
        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 = { 8955c4 e8???????? 6a00 6a02 52 50 }
            // n = 6, score = 500
            //   8955c4               | mov                 dword ptr [ebp - 0x3c], edx
            //   e8????????           |                     
            //   6a00                 | push                0
            //   6a02                 | push                2
            //   52                   | push                edx
            //   50                   | push                eax

        $sequence_1 = { 8d7004 8bca 895df8 895dec b8fc030000 }
            // n = 5, score = 500
            //   8d7004               | lea                 esi, [eax + 4]
            //   8bca                 | mov                 ecx, edx
            //   895df8               | mov                 dword ptr [ebp - 8], ebx
            //   895dec               | mov                 dword ptr [ebp - 0x14], ebx
            //   b8fc030000           | mov                 eax, 0x3fc

        $sequence_2 = { 8bf9 c1ef02 33d7 03c2 03ce 8bfe c1e708 }
            // n = 7, score = 500
            //   8bf9                 | mov                 edi, ecx
            //   c1ef02               | shr                 edi, 2
            //   33d7                 | xor                 edx, edi
            //   03c2                 | add                 eax, edx
            //   03ce                 | add                 ecx, esi
            //   8bfe                 | mov                 edi, esi
            //   c1e708               | shl                 edi, 8

        $sequence_3 = { 50 53 ffb5a0fdffff ff15???????? 898594fdffff 83f8ff 0f8421020000 }
            // n = 7, score = 500
            //   50                   | push                eax
            //   53                   | push                ebx
            //   ffb5a0fdffff         | push                dword ptr [ebp - 0x260]
            //   ff15????????         |                     
            //   898594fdffff         | mov                 dword ptr [ebp - 0x26c], eax
            //   83f8ff               | cmp                 eax, -1
            //   0f8421020000         | je                  0x227

        $sequence_4 = { e8???????? 8bc6 5d c20400 6a00 6a01 }
            // n = 6, score = 500
            //   e8????????           |                     
            //   8bc6                 | mov                 eax, esi
            //   5d                   | pop                 ebp
            //   c20400               | ret                 4
            //   6a00                 | push                0
            //   6a01                 | push                1

        $sequence_5 = { 03d8 c1e008 33d8 8b45fc 03d3 0155fc 895df8 }
            // n = 7, score = 500
            //   03d8                 | add                 ebx, eax
            //   c1e008               | shl                 eax, 8
            //   33d8                 | xor                 ebx, eax
            //   8b45fc               | mov                 eax, dword ptr [ebp - 4]
            //   03d3                 | add                 edx, ebx
            //   0155fc               | add                 dword ptr [ebp - 4], edx
            //   895df8               | mov                 dword ptr [ebp - 8], ebx

        $sequence_6 = { 56 57 33ff 8945e8 393d???????? 0f8584000000 68???????? }
            // n = 7, score = 500
            //   56                   | push                esi
            //   57                   | push                edi
            //   33ff                 | xor                 edi, edi
            //   8945e8               | mov                 dword ptr [ebp - 0x18], eax
            //   393d????????         |                     
            //   0f8584000000         | jne                 0x8a
            //   68????????           |                     

        $sequence_7 = { 59 8db534feffff f3a5 8b7d14 6a14 59 }
            // n = 6, score = 500
            //   59                   | pop                 ecx
            //   8db534feffff         | lea                 esi, [ebp - 0x1cc]
            //   f3a5                 | rep movsd           dword ptr es:[edi], dword ptr [esi]
            //   8b7d14               | mov                 edi, dword ptr [ebp + 0x14]
            //   6a14                 | push                0x14
            //   59                   | pop                 ecx

        $sequence_8 = { e8???????? ff75f4 8bf8 ff75f0 8bda ff75ec }
            // n = 6, score = 500
            //   e8????????           |                     
            //   ff75f4               | push                dword ptr [ebp - 0xc]
            //   8bf8                 | mov                 edi, eax
            //   ff75f0               | push                dword ptr [ebp - 0x10]
            //   8bda                 | mov                 ebx, edx
            //   ff75ec               | push                dword ptr [ebp - 0x14]

        $sequence_9 = { 8b45f0 8945e8 8d45ec 50 }
            // n = 4, score = 500
            //   8b45f0               | mov                 eax, dword ptr [ebp - 0x10]
            //   8945e8               | mov                 dword ptr [ebp - 0x18], eax
            //   8d45ec               | lea                 eax, [ebp - 0x14]
            //   50                   | push                eax

    condition:
        7 of them and filesize < 328704
}
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