Analysis
- max time kernel
165s - max time network
169s - platform
windows11-ltsc_2024_x64 - resource
win11ltsc2024-20260709-en - resource tags
arch:x64arch:x86image:win11ltsc2024-20260709-enlocale:en-usos:windows11-ltsc_2024-x64systemwindows - submitted
07/08/2026, 17:21
Static task
static1
Behavioral task
behavioral1
Sample
Tax Notice.exe
Resource
win10v2004-20260513-en
windows10-2004-x64
15 signatures
150 seconds
Behavioral task
behavioral2
Sample
Tax Notice.exe
Resource
win11ltsc2024-20260709-en
windows11-ltsc_2024-x64
14 signatures
150 seconds
General
- Target Tax Notice.exe
- Size 25.3MB
- Sample260807-vxgcbshr4x
- SHA256 749c688bc6049b650c31c956c86b269844ebb3e55939f8b99bf8f90a59cc4218
- MD5 b4244b9f2684275fab4192b04f378b62
- SHA1 6ae839ed1dbc48d54b5c03f5634e8cf91480b3a1
- SHA512 4dfb2045aaee7ce1be1d59b23a18063fa491936ece23a4aa55fb67be08c8096d25fb82f121fb936336bafa0f06307044eefb7acf7a5afee7a1bcf915e14e760b
- SSDEEP 786432:KOAoS1wzATG+rjPYwVB5i/OotaLWy01c80lawntf6:nAoS6AqaJVG/OogLScJlj6
- TLSH T10F4733629DF97815CEF11D339AEF674AE1E6B840EC7864D15EC27C62933ECE4082A435
- MD5 SHA1 SHA512 SSDEEP TLSH
Score
10/10
Malware Config
Signatures
- UAC bypass 3 TTPs 1 IoCs
description ioc Process Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\PromptOnSecureDesktop = "0" rdclient.exe - Drops file in System32 directory 8 IoCs
description ioc Process File opened for modification C:\Windows\SysWOW64\config\systemprofile\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData rdclient.exe File opened for modification C:\Windows\SysWOW64\config\systemprofile\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\949AE42F2E1940677F52E2DFF8C7AE5F rdclient.exe File opened for modification C:\Windows\SysWOW64\config\systemprofile\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content rdclient.exe File opened for modification C:\Windows\SysWOW64\config\systemprofile\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\949AE42F2E1940677F52E2DFF8C7AE5F rdclient.exe File opened for modification C:\Windows\SysWOW64\config\systemprofile\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\4A96CC62C00FEA3DDB8AB25852385FFA rdclient.exe File opened for modification C:\Windows\SysWOW64\config\systemprofile\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\4A96CC62C00FEA3DDB8AB25852385FFA rdclient.exe File opened for modification C:\Windows\SysWOW64\config\systemprofile\AppData\LocalLow\Microsoft rdclient.exe File opened for modification C:\Windows\SysWOW64\config\systemprofile\AppData\LocalLow\Microsoft\CryptnetUrlCache rdclient.exe - Executes dropped EXE 2 IoCs
pid Process 6636 rdservice.exe 6760 rdclient.exe - Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
- Executes a command shell one-liner 1 TTPs 1 IoCs
Execution of a cmd.exe one-liner (/c "close" or /k "keep") is a common script/loader stage.
pid Process 6836 cmd.exe - System Location Discovery: System Language Discovery 1 TTPs 5 IoCs
Attempt gather information about the system language of a victim in order to infer the geographical location of that host.
description ioc Process Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language Tax Notice.exe Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language rdservice.exe Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language cmd.exe Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language PING.EXE Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language rdclient.exe - System Network Configuration Discovery: Internet Connection Discovery 1 TTPs 2 IoCs
Adversaries may check for Internet connectivity on compromised systems.
pid Process 6836 cmd.exe 2064 PING.EXE - Modifies data under HKEY_USERS 49 IoCs
description ioc Process Key created \REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\TrustedPeople\Certificates rdclient.exe Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\trust\Certificates rdclient.exe Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\TrustedPublisher\CRLs rdclient.exe Key created \REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\TrustedPublisher rdclient.exe Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\Root\CTLs rdclient.exe Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\TrustedPeople\Certificates rdclient.exe Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\TrustedPeople\CTLs rdclient.exe Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\trust rdclient.exe Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\TrustedPublisher\CTLs rdclient.exe Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\CA rdclient.exe Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\CA\CRLs rdclient.exe Key created \REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\Disallowed\CRLs rdclient.exe Key created \REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\TrustedPeople rdclient.exe Key created \REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\trust rdclient.exe Key created \REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\trust\Certificates rdclient.exe Key created \REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\trust\CTLs rdclient.exe Key created \REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\TrustedPublisher\CRLs rdclient.exe Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\SmartCardRoot\Certificates rdclient.exe Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\SmartCardRoot\CTLs rdclient.exe Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\Disallowed\Certificates rdclient.exe Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\Root rdclient.exe Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\SmartCardRoot rdclient.exe Key created \REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\TrustedPeople\CTLs rdclient.exe Key created \REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\TrustedPublisher\Certificates rdclient.exe Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\Disallowed rdclient.exe Key created \REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\Disallowed\CTLs rdclient.exe Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\Root\Certificates rdclient.exe Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\TrustedPeople rdclient.exe Key created \REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\trust\CRLs rdclient.exe Key created \REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\TrustedPublisher\CTLs rdclient.exe Key created \REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\CA\Certificates rdclient.exe Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\Disallowed\CTLs rdclient.exe Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\trust\CTLs rdclient.exe Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\TrustedPublisher\Certificates rdclient.exe Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\CA\Certificates rdclient.exe Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\CA\CTLs rdclient.exe Key created \REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\CA\CTLs rdclient.exe Key created \REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\Disallowed\Certificates rdclient.exe Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\SmartCardRoot\CRLs rdclient.exe Key created \REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\TrustedPeople\CRLs rdclient.exe Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\TrustedPublisher rdclient.exe Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\WinTrust\Trust Providers\Software Publishing rdclient.exe Key created \REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\CA rdclient.exe Key created \REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\CA\CRLs rdclient.exe Key created \REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\Disallowed rdclient.exe Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\Root\CRLs rdclient.exe Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\trust\CRLs rdclient.exe Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\Disallowed\CRLs rdclient.exe Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\TrustedPeople\CRLs rdclient.exe - Runs ping.exe 1 TTPs 1 IoCs
pid Process 2064 PING.EXE - Suspicious behavior: EnumeratesProcesses 64 IoCs
pid Process 6156 Tax Notice.exe 6156 Tax Notice.exe 6636 rdservice.exe 6636 rdservice.exe 6636 rdservice.exe 6636 rdservice.exe 6636 rdservice.exe 6636 rdservice.exe 6636 rdservice.exe 6636 rdservice.exe 6636 rdservice.exe 6636 rdservice.exe 6636 rdservice.exe 6636 rdservice.exe 6636 rdservice.exe 6636 rdservice.exe 6636 rdservice.exe 6636 rdservice.exe 6636 rdservice.exe 6636 rdservice.exe 6636 rdservice.exe 6636 rdservice.exe 6636 rdservice.exe 6636 rdservice.exe 6636 rdservice.exe 6636 rdservice.exe 6636 rdservice.exe 6636 rdservice.exe 6636 rdservice.exe 6636 rdservice.exe 6760 rdclient.exe 6760 rdclient.exe 6636 rdservice.exe 6636 rdservice.exe 6636 rdservice.exe 6636 rdservice.exe 6636 rdservice.exe 6636 rdservice.exe 6636 rdservice.exe 6636 rdservice.exe 6636 rdservice.exe 6636 rdservice.exe 6636 rdservice.exe 6636 rdservice.exe 6636 rdservice.exe 6636 rdservice.exe 6636 rdservice.exe 6636 rdservice.exe 6636 rdservice.exe 6636 rdservice.exe 6636 rdservice.exe 6636 rdservice.exe 6636 rdservice.exe 6636 rdservice.exe 6636 rdservice.exe 6636 rdservice.exe 6636 rdservice.exe 6636 rdservice.exe 6636 rdservice.exe 6636 rdservice.exe 6636 rdservice.exe 6636 rdservice.exe 6636 rdservice.exe 6636 rdservice.exe - Suspicious use of AdjustPrivilegeToken 3 IoCs
description pid Process Token: SeDebugPrivilege 6636 rdservice.exe Token: SeDebugPrivilege 6636 rdservice.exe Token: SeDebugPrivilege 6760 rdclient.exe - Suspicious use of SetWindowsHookEx 2 IoCs
pid Process 6760 rdclient.exe 6760 rdclient.exe - Suspicious use of WriteProcessMemory 3 IoCs
description pid Process procid_target PID 6156 wrote to memory of 6836 6156 Tax Notice.exe 91 PID 6836 wrote to memory of 2064 6836 cmd.exe 93 PID 6636 wrote to memory of 6760 6636 rdservice.exe 94 - System policy modification 1 TTPs 2 IoCs
description ioc Process Key created \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System rdclient.exe Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\PromptOnSecureDesktop = "0" rdclient.exe
Processes
-
C:\Users\Admin\AppData\Local\Temp\Tax Notice.exe"C:\Users\Admin\AppData\Local\Temp\Tax Notice.exe"1⤵
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:6156 -
C:\Windows\SysWOW64\cmd.execmd /c ping -n 2 127.0.0.1 >nul 2>&1 && del /f /q "C:\Users\Admin\AppData\Local\Temp\Tax Notice.exe"2⤵
- Executes a command shell one-liner
- System Location Discovery: System Language Discovery
- System Network Configuration Discovery: Internet Connection Discovery
- Suspicious use of WriteProcessMemory
PID:6836 -
C:\Windows\SysWOW64\PING.EXEping -n 2 127.0.0.13⤵
- System Location Discovery: System Language Discovery
- System Network Configuration Discovery: Internet Connection Discovery
- Runs ping.exe
PID:2064
-
-
-
C:\ProgramData\host\rdservice.exe"C:\ProgramData\host\rdservice.exe"1⤵
- Executes dropped EXE
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:6636 -
C:\ProgramData\host\rdclient.exeC:\ProgramData\host\rdclient.exe quiet2⤵
- UAC bypass
- Drops file in System32 directory
- Executes dropped EXE
- System Location Discovery: System Language Discovery
- Modifies data under HKEY_USERS
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- System policy modification
PID:6760
-
Network
MITRE ATT&CK Enterprise v16
Privilege Escalation
Abuse Elevation Control Mechanism
1Bypass User Account Control
1Defense Evasion
Abuse Elevation Control Mechanism
1Bypass User Account Control
1Impair Defenses
1Disable or Modify Tools
1Modify Registry
2Replay Monitor
Loading Replay Monitor...
Downloads
- Path C:\ProgramData\Microsoft\Crypto\RSA\S-1-5-18\88f36de56392b84feda84969b45f30b9_d5e54a0f-d754-47a7-8a66-1e2f67368c3c
- Size 50B
- SHA256 7eeb436301cdc6ee97dd4011b9ead691b33f6886416a05aaff40f212f05df99d
- MD5 d08d9f9facb442915d064216e8d95433
- SHA1 f9955e94ad4414b6f8ea4dd2f42db593ba853a14
- SHA512 59701a5a36d12cad2e1378cf3c3335dc412086e41969ab5229e003671358bbccec79d70bcf5c10dcccb7ea8c2591da2fe6f57bb6406ea85a992a33002eb2aaa9
- MD5 SHA1 SHA512
- Path C:\ProgramData\host\cfg.ini
- Size 171B
- SHA256 7f49d9c3239199bfd6a8923bff31a43025751a6665c74ce4666acdcee6c2e9b0
- MD5 9d44c5fe8fb486ffb1fd97c1f7b123f2
- SHA1 4ba0db13f49a1b39f0af1322eb1c733cf521cf00
- SHA512 2f1d764d1982378bd49cd1b5a66d5079d89b1a33cf7a42333138336f13dbf447bbc03e796c3a08c588600c7aefe4ca0ae3a4c9b4b69333aa08c86da359156ee7
- TLSH T156C08015E55AB19155FD112C804745988682FF047E279844549444C5ED6C1F2270A91D
- MD5 SHA1 SHA512 TLSH
- Path C:\ProgramData\host\host.dat
- Size 130B
- SHA256 43701a2a1571ce9419b9b3c3634f61e2b815dd9e48c6cc5468b974c11d1dad05
- MD5 f6990bb8c71d597791ae22fa9aaf3635
- SHA1 41e3234d200b0ee56da2135c33bddfe4de24a806
- SHA512 312663cee5d8a97559108de5875772e65f8648e09608e01e0079b809935a84b5a388905055e520763e708841147fe4f843ca7df156c46ff72d66d72aac1cd0d3
- TLSH T1A8C02208EE28CC00E2C8A3088880FE30A02C3A2C80A208AE22282320030880C00AA30E
- MD5 SHA1 SHA512 TLSH
- Path C:\ProgramData\host\rdclient.exe
- Size 34.2MB
- SHA256 cc91fa509ce19e67a421173704e016892df4089ab494de894a8c5de52d17e857
- MD5 3eb6505bcac48acf0fbac10b01a95ba7
- SHA1 be22bfa934d534733ae6dedab44fa357c1602f57
- SHA512 8a882f6d8c6a2c59d82253ee25529cadaa075b19f9227132728870a0fba25edab5087642002efd7ee482b6699a5506c63816ba29cd63c3025de5686bca906cd9
- SSDEEP 786432:/6edC7FF54V7TYk6UBc4TQpAJUrsBSjpZr/LWwDp6:/6uC7FF54lTmUq4smJUlpZrTWwDp6
- TLSH T18977F103B280A03AD8671B3A9C3BE295193FBE216A259C4777B87D4C5F3A7407D29747
- MD5 SHA1 SHA512 SSDEEP TLSH
- Path C:\ProgramData\host\rdservice.exe
- Size 2.5MB
- SHA256 7ed2a077a1ce34fcb182e5135ae75ad7bd96207c3204c9f343095f967bfa109f
- MD5 db3d3a7f82f0c7afb258a98c50a66a36
- SHA1 8cc26bec161dc58472e848c427310ae396520f88
- SHA512 73b54dc39fbb512054168ad59acaf00b2177138091869f6df46a8fa24b98e977092617cc89d32cad5690f8e930715352003adde7d3a0ac9a1c9fcb942f62471e
- SSDEEP 24576:dEGJjsQPX8V/vLGUFAyzEVSg1F2+kkROf4pY7DH7cpFVBqSRg/lIhu/WST5V2tSw:Ts8Xi3LdFb0MR7uVASC/rWSrU3
- TLSH T127C55B23B2D9653ED06B173A5827B6145C3BB7A13A2A9C0797F4084C9F296C13E3B747
- MD5 SHA1 SHA512 SSDEEP TLSH