SYMBOLCOMMON_NAMEaka. SYNONYMS
win.flawedgrace (Back to overview)

FlawedGrace

aka: GraceWire

Actor(s): TA505

VTCollection    

According to ProofPoint, FlawedGrace is written in C++ and can be categorized as a Remote Access Trojan (RAT). It seems to have been developed in the second half of 2017 mainly.

FlawedGrace uses a series of commands:
FlawedGrace also uses a series of commands, provided below for reference:
* desktop_stat
* destroy_os
* target_download
* target_module_load
* target_module_load_external
* target_module_unload
* target_passwords
* target_rdp
* target_reboot
* target_remove
* target_script
* target_servers
* target_update
* target_upload

References
2023-12-30 ⋅ Rewterz Information Security ⋅ Rewterz Information Security
Rewterz Threat Alert – Widely Abused MSIX App Installer Disabled by Microsoft – Active IOCs
EugenLoader POWERTRASH BATLOADER DarkGate FlawedGrace NetSupportManager RAT SectopRAT Storm-0506
2023-06-12 ⋅ The DFIR Report ⋅ Maxime Thiebaut
A Truly Graceful Wipe Out
FlawedGrace Silence
2022-12-08 ⋅ Cisco Talos ⋅ Tiago Pereira
Breaking the silence - Recent Truebot activity
Clop Cobalt Strike FlawedGrace Raspberry Robin Silence Teleport
2022-11-11 ⋅ Codesec ⋅ Hugo Caron
GraceWire / FlawedGrace malware adventure
FlawedGrace
2021-12-01 ⋅ NCC Group ⋅ Michael Sandee, Nikolaos Pantazopoulos
Tracking a P2P network related to TA505
FlawedGrace Necurs
2021-10-21 ⋅ CrowdStrike ⋅ Alex Clinton, Tasha Robinson
Stopping GRACEFUL SPIDER: Falcon Complete’s Fast Response to Recent SolarWinds Serv-U Exploit Campaign
Cobalt Strike FlawedGrace TinyMet
2021-10-19 ⋅ Proofpoint ⋅ Axel F, Brandon Murphy, Crista Giering, Georgi Mladenov, Matthew Mesa, Zydeca Cass
Whatta TA: TA505 Ramps Up Activity, Delivers New FlawedGrace Variant
FlawedGrace MirrorBlast
2021-03-02 ⋅ Möbius Strip Reverse Engineering ⋅ Rolf Rolles
An Exhaustively-Analyzed IDB for FlawedGrace
FlawedGrace
2020-08-20 ⋅ CERT-FR ⋅ CERT-FR
Development of the Activity of the TA505 Cybercriminal Group
AndroMut Bart Clop Dridex FlawedAmmyy FlawedGrace Get2 Locky Marap QuantLoader SDBbot ServHelper tRat TrickBot
2020-06-22 ⋅ ⋅ CERT-FR ⋅ CERT-FR
Évolution De Lactivité du Groupe Cybercriminel TA505
Amadey AndroMut Bart Clop Dridex FlawedGrace Gandcrab Get2 GlobeImposter Jaff Locky Marap Philadephia Ransom QuantLoader Scarab Ransomware SDBbot ServHelper Silence tRat TrickBot
2020-06-17 ⋅ Twitter (@MsftSecIntel) ⋅ Microsoft Security Intelligence
A tweet thread on TA505 using CAPTCHA to avoid detection and infecting victims with FlawedGrace
FlawedGrace
2020-05-21 ⋅ Intel 471 ⋅ Intel 471
A brief history of TA505
AndroMut Bart Dridex FlawedAmmyy FlawedGrace Gandcrab Get2 GlobeImposter Jaff Kegotip Locky Necurs Philadephia Ransom Pony QuantLoader Rockloader SDBbot ServHelper Shifu Snatch TrickBot
2020-03-26 ⋅ Telekom ⋅ Thomas Barabosch
TA505's Box of Chocolate - On Hidden Gems packed with the TA505 Packer
Amadey Azorult Clop FlawedGrace Get2 SDBbot Silence TinyMet TA505
2020-03-03 ⋅ PWC UK ⋅ PWC UK
Cyber Threats 2019:A Year in Retrospect
KevDroid MESSAGETAP magecart AndroMut Cobalt Strike CobInt Crimson RAT DNSpionage Dridex Dtrack Emotet FlawedAmmyy FlawedGrace FriedEx Gandcrab Get2 GlobeImposter Grateful POS ISFB Kazuar LockerGoga Nokki QakBot Ramnit REvil Rifdoor RokRAT Ryuk shadowhammer ShadowPad Shifu Skipper StoneDrill Stuxnet TrickBot Winnti ZeroCleare APT41 MUSTANG PANDA Sea Turtle
2020-02-13 ⋅ Qianxin ⋅ Qi Anxin Threat Intelligence Center
APT Report 2019
Chrysaor Exodus Dacls VPNFilter DNSRat Griffon KopiLuwak More_eggs SQLRat AppleJeus BONDUPDATER Agent.BTZ Anchor AndroMut AppleJeus BOOSTWRITE Brambul Carbanak Cobalt Strike Dacls DistTrack DNSpionage Dtrack ELECTRICFISH FlawedAmmyy FlawedGrace Get2 Grateful POS HOPLIGHT Imminent Monitor RAT jason Joanap KerrDown KEYMARBLE Lambert LightNeuron LoJax MiniDuke PolyglotDuke PowerRatankba Rising Sun SDBbot ServHelper Snatch Stuxnet TinyMet tRat TrickBot Volgmer X-Agent Zebrocy
2020-01-01 ⋅ Secureworks ⋅ SecureWorks
GOLD TAHOE
Clop FlawedAmmyy FlawedGrace Get2 SDBbot ServHelper TA505
2019-01-14 ⋅ Möbius Strip Reverse Engineering ⋅ Rolf Rolles
A Quick Solution to an Ugly Reverse Engineering Problem
FlawedGrace
2019-01-09 ⋅ Proofpoint ⋅ Dennis Schwarz, Proofpoint Staff
ServHelper and FlawedGrace - New malware introduced by TA505
FlawedGrace ServHelper
Yara Rules
[TLP:WHITE] win_flawedgrace_auto (20251219 | Detects win.flawedgrace.)
rule win_flawedgrace_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-01-05"
        version = "1"
        description = "Detects win.flawedgrace."
        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.flawedgrace"
        malpedia_rule_date = "20260105"
        malpedia_hash = "19b79e7cab4eaf532122e5b45a77dd8f6bb5cc79"
        malpedia_version = "20251219"
        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 = { 8bcf e8???????? 83c404 85c0 0f84a8010000 0f31 52 }
            // n = 7, score = 200
            //   8bcf                 | mov                 ecx, edi
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   85c0                 | test                eax, eax
            //   0f84a8010000         | je                  0x1ae
            //   0f31                 | rdtsc               
            //   52                   | push                edx

        $sequence_1 = { 0fb6c0 894dec 8bcb c1e918 8b0485e0bb4500 33048de0bf4500 894510 }
            // n = 7, score = 200
            //   0fb6c0               | movzx               eax, al
            //   894dec               | mov                 dword ptr [ebp - 0x14], ecx
            //   8bcb                 | mov                 ecx, ebx
            //   c1e918               | shr                 ecx, 0x18
            //   8b0485e0bb4500       | mov                 eax, dword ptr [eax*4 + 0x45bbe0]
            //   33048de0bf4500       | xor                 eax, dword ptr [ecx*4 + 0x45bfe0]
            //   894510               | mov                 dword ptr [ebp + 0x10], eax

        $sequence_2 = { c6853bf5ffff00 c6853cf5ffffff c6853df5ffff25 c6853ef5ffff30 c6853ff5ffff20 c68540f5ffff40 c68541f5ffff00 }
            // n = 7, score = 200
            //   c6853bf5ffff00       | mov                 byte ptr [ebp - 0xac5], 0
            //   c6853cf5ffffff       | mov                 byte ptr [ebp - 0xac4], 0xff
            //   c6853df5ffff25       | mov                 byte ptr [ebp - 0xac3], 0x25
            //   c6853ef5ffff30       | mov                 byte ptr [ebp - 0xac2], 0x30
            //   c6853ff5ffff20       | mov                 byte ptr [ebp - 0xac1], 0x20
            //   c68540f5ffff40       | mov                 byte ptr [ebp - 0xac0], 0x40
            //   c68541f5ffff00       | mov                 byte ptr [ebp - 0xabf], 0

        $sequence_3 = { c6858ddaffff33 c6858edaffff00 c6858fdaffff00 c68590daffff00 c68591daffff00 c68592daffff00 c68593daffff00 }
            // n = 7, score = 200
            //   c6858ddaffff33       | mov                 byte ptr [ebp - 0x2573], 0x33
            //   c6858edaffff00       | mov                 byte ptr [ebp - 0x2572], 0
            //   c6858fdaffff00       | mov                 byte ptr [ebp - 0x2571], 0
            //   c68590daffff00       | mov                 byte ptr [ebp - 0x2570], 0
            //   c68591daffff00       | mov                 byte ptr [ebp - 0x256f], 0
            //   c68592daffff00       | mov                 byte ptr [ebp - 0x256e], 0
            //   c68593daffff00       | mov                 byte ptr [ebp - 0x256d], 0

        $sequence_4 = { c68565f2ffff00 c68566f2ffff85 c68567f2ffffc0 c68568f2ffff74 c68569f2ffff3a c6856af2ffff81 c6856bf2ffff7d }
            // n = 7, score = 200
            //   c68565f2ffff00       | mov                 byte ptr [ebp - 0xd9b], 0
            //   c68566f2ffff85       | mov                 byte ptr [ebp - 0xd9a], 0x85
            //   c68567f2ffffc0       | mov                 byte ptr [ebp - 0xd99], 0xc0
            //   c68568f2ffff74       | mov                 byte ptr [ebp - 0xd98], 0x74
            //   c68569f2ffff3a       | mov                 byte ptr [ebp - 0xd97], 0x3a
            //   c6856af2ffff81       | mov                 byte ptr [ebp - 0xd96], 0x81
            //   c6856bf2ffff7d       | mov                 byte ptr [ebp - 0xd95], 0x7d

        $sequence_5 = { 7416 8b85ccc0ffff 50 6a00 ff15???????? }
            // n = 5, score = 200
            //   7416                 | je                  0x18
            //   8b85ccc0ffff         | mov                 eax, dword ptr [ebp - 0x3f34]
            //   50                   | push                eax
            //   6a00                 | push                0
            //   ff15????????         |                     

        $sequence_6 = { 8b0495b8d34600 f644082801 7421 57 e8???????? 59 50 }
            // n = 7, score = 200
            //   8b0495b8d34600       | mov                 eax, dword ptr [edx*4 + 0x46d3b8]
            //   f644082801           | test                byte ptr [eax + ecx + 0x28], 1
            //   7421                 | je                  0x23
            //   57                   | push                edi
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   50                   | push                eax

        $sequence_7 = { c685abfdffff00 c685acfdffff00 c685adfdffff00 c685aefdffff00 c685affdffff00 c685b0fdffff00 c685b1fdffff00 }
            // n = 7, score = 200
            //   c685abfdffff00       | mov                 byte ptr [ebp - 0x255], 0
            //   c685acfdffff00       | mov                 byte ptr [ebp - 0x254], 0
            //   c685adfdffff00       | mov                 byte ptr [ebp - 0x253], 0
            //   c685aefdffff00       | mov                 byte ptr [ebp - 0x252], 0
            //   c685affdffff00       | mov                 byte ptr [ebp - 0x251], 0
            //   c685b0fdffff00       | mov                 byte ptr [ebp - 0x250], 0
            //   c685b1fdffff00       | mov                 byte ptr [ebp - 0x24f], 0

        $sequence_8 = { 3934bdb8d34600 7531 e8???????? 8904bdb8d34600 85c0 7514 6a0c }
            // n = 7, score = 200
            //   3934bdb8d34600       | cmp                 dword ptr [edi*4 + 0x46d3b8], esi
            //   7531                 | jne                 0x33
            //   e8????????           |                     
            //   8904bdb8d34600       | mov                 dword ptr [edi*4 + 0x46d3b8], eax
            //   85c0                 | test                eax, eax
            //   7514                 | jne                 0x16
            //   6a0c                 | push                0xc

        $sequence_9 = { c685d3c8ffff05 c685d4c8ffff00 c685d5c8ffff00 c685d6c8ffff00 c685d7c8ffffe8 c685d8c8ffff48 c685d9c8ffff0f }
            // n = 7, score = 200
            //   c685d3c8ffff05       | mov                 byte ptr [ebp - 0x372d], 5
            //   c685d4c8ffff00       | mov                 byte ptr [ebp - 0x372c], 0
            //   c685d5c8ffff00       | mov                 byte ptr [ebp - 0x372b], 0
            //   c685d6c8ffff00       | mov                 byte ptr [ebp - 0x372a], 0
            //   c685d7c8ffffe8       | mov                 byte ptr [ebp - 0x3729], 0xe8
            //   c685d8c8ffff48       | mov                 byte ptr [ebp - 0x3728], 0x48
            //   c685d9c8ffff0f       | mov                 byte ptr [ebp - 0x3727], 0xf

    condition:
        7 of them and filesize < 966656
}
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