juko | a58aaa191ece6eb2f75672dccab5a95a3e8efb93431a594fedd6c9d56badae3d

General

Target
2026-08-04_588aef4fadf8278dbf6c11920c1baf1e_elex_wannacry.exe
Size 53KB
Sample260804-s511la1ybw
SHA256 a58aaa191ece6eb2f75672dccab5a95a3e8efb93431a594fedd6c9d56badae3d
MD5 588aef4fadf8278dbf6c11920c1baf1e
SHA1 d38ef274cd1c3cc4e7c361e919d3d42e672724ea
SHA512 1288fea3a9c76eee4aa035e0c94c822663ada3432fe96c45772534a35469a2506f76727beb8269bf068cdd7815e749c42184cb1ccc5e6043833cbf7493f58d45
SSDEEP 1536:3LsF2Kerc64sTiX2IV0D5tcz9Kf8pOOq2x:3Ly2Kerc64CiGIm1tcBMUOOFx
TLSH
T11A335C176A459056C0BB52B0FC884F30823AADB405B7B213B349B65D1CB2E52DFB1DBE
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

discovery execution juko persistence trojan

Malware Config

Signatures

Family: Juko
Juko is a trojan written in C++.
trojan juko

Detects Juko 2 IoCs

resource	yara_rule
behavioral2/files/0x000900000001b83c-4.dat	family_juko
behavioral2/files/0x000e00000001c583-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
1116	WINWORD.exe
1260	WINWORD.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-1079202589-886135813-2527035092-1000\Software\Microsoft\Windows\CurrentVersion\Run\WINWORD = "C:\\Users\\Admin\\AppData\\Roaming\\Mozilla\\WINWORD.exe -r"	WINWORD.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

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.

execution

Windows Command Shell

T1059.003

pid	Process
5936	cmd.exe

System Location Discovery: System Language Discovery 1 TTPs 7 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.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	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-08-04_588aef4fadf8278dbf6c11920c1baf1e_elex_wannacry.exe

System Network Configuration Discovery: Internet Connection Discovery 1 TTPs 4 IoCs

Adversaries may check for Internet connectivity on compromised systems.

discovery

Internet Connection Discovery

T1016.001

pid	Process
5936	cmd.exe
5524	PING.EXE
4364	PING.EXE
2844	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
5524	PING.EXE
4364	PING.EXE
2844	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5676 wrote to memory of 1116	5676	2026-08-04_588aef4fadf8278dbf6c11920c1baf1e_elex_wannacry.exe	89
PID 1116 wrote to memory of 5936	1116	WINWORD.exe	90
PID 5936 wrote to memory of 5524	5936	cmd.exe	92
PID 5936 wrote to memory of 4364	5936	cmd.exe	93
PID 5936 wrote to memory of 2844	5936	cmd.exe	94
PID 5936 wrote to memory of 1260	5936	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-04_588aef4fadf8278dbf6c11920c1baf1e_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-04_588aef4fadf8278dbf6c11920c1baf1e_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5676
- C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
  "C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" -r
  2⤵
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:1116
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\System32\cmd.exe" /c ping 127.0.0.1 -n 2&del "C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe"&ping 127.0.0.1 -n 2&rename "C:\Users\Admin\AppData\Roaming\Mozilla\000004AB" WINWORD.exe&ping 127.0.0.1 -n 2&"C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" \r
    3⤵
    - Executes a command shell one-liner
    - System Location Discovery: System Language Discovery
    - System Network Configuration Discovery: Internet Connection Discovery
    - Suspicious use of WriteProcessMemory
    PID:5936
  - - C:\Windows\SysWOW64\PING.EXE
      ping 127.0.0.1 -n 2
      4⤵
      System Location Discovery: System Language Discovery
      System Network Configuration Discovery: Internet Connection Discovery
      Runs ping.exe
      PID:5524
  - - C:\Windows\SysWOW64\PING.EXE
      ping 127.0.0.1 -n 2
      4⤵
      System Location Discovery: System Language Discovery
      System Network Configuration Discovery: Internet Connection Discovery
      Runs ping.exe
      PID:4364
  - - C:\Windows\SysWOW64\PING.EXE
      ping 127.0.0.1 -n 2
      4⤵
      System Location Discovery: System Language Discovery
      System Network Configuration Discovery: Internet Connection Discovery
      Runs ping.exe
      PID:2844
  - - C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
      "C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" \r
      4⤵
      Executes dropped EXE
      Adds Run key to start application
      System Location Discovery: System Language Discovery
      PID:1260

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

Windows Command Shell

1

T1059.003

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Remote System Discovery

1

T1018

System Information Discovery

1

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

System Network Configuration Discovery

1

T1016

Internet Connection Discovery

1

T1016.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

000004AB

Path C:\Users\Admin\AppData\Roaming\Mozilla\000004AB
Size 53KB
SHA256 fe90974672c5cb1bdab45e6d72e5604c38d6080e2f2080bd41178343c6987122
MD5 65f618e25fe050e58b8f66a11ef4a2f7
SHA1 ae80af34d6102b6b40ec1dfd87f8fd3d7a6ba428
SHA512 7aee64bbf186aabc3e01edb79a999351c6a5dac90f3da923afa714b8eed82b7a24442a0569f6419fa331378617a9aff22a2b4d7166633fad435ae0d9325f8174
SSDEEP 1536:3LsF2Kerc64sTiX2IV0D5tcz9Kf8pOOq2B:3Ly2Kerc64CiGIm1tcBMUOOFB
TLSH
T1CB335B176A459056C0BB52B0FC884F30823AADB405B7B213B349B65D1CB2E52DFB1DBE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 53KB
SHA256 a58aaa191ece6eb2f75672dccab5a95a3e8efb93431a594fedd6c9d56badae3d
MD5 588aef4fadf8278dbf6c11920c1baf1e
SHA1 d38ef274cd1c3cc4e7c361e919d3d42e672724ea
SHA512 1288fea3a9c76eee4aa035e0c94c822663ada3432fe96c45772534a35469a2506f76727beb8269bf068cdd7815e749c42184cb1ccc5e6043833cbf7493f58d45
SSDEEP 1536:3LsF2Kerc64sTiX2IV0D5tcz9Kf8pOOq2x:3Ly2Kerc64CiGIm1tcBMUOOFx
TLSH
T11A335C176A459056C0BB52B0FC884F30823AADB405B7B213B349B65D1CB2E52DFB1DBE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads