juko | d8165fb501a93d0100f26d7ad7a634ef51ff2f076c366d9e1b94d8cdcca79ac3

General

Target
2026-07-27_d226a10e49509b733c1528aedfa6493d_elex_wannacry.exe
Size 56KB
Sample260727-a2cjqagg43
SHA256 d8165fb501a93d0100f26d7ad7a634ef51ff2f076c366d9e1b94d8cdcca79ac3
MD5 d226a10e49509b733c1528aedfa6493d
SHA1 464110824dbb4962d1b858cf83d4cbc9b0fec4b7
SHA512 c1643d5c38737b762938df8ec08e04e854bc7e1384c230a3ba86600a560006b7d08d02128ee812bcd7c5f918f9c93f433fd4742161bf354ccc14d6c510f2e258
SSDEEP 1536:PLsF2Kerc64sTiX2IV0DeRa8OKFVG9WGWM:PLy2Kerc64CiGImqRa8OKFE9WBM
TLSH
T1564319277AE55CD2C15360F0EAE49B308038FD7219279023E794BB9816BEC92DF7169D
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 7 IoCs

resource	yara_rule
behavioral2/memory/2780-0-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/files/0x000a000000011380-5.dat	family_juko
behavioral2/memory/2780-10-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/memory/424-12-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/files/0x001100000001c481-13.dat	family_juko
behavioral2/memory/4640-15-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/memory/4640-16-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
424	WINWORD.exe
4640	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-1-5-21-2246396966-3025826688-3847171515-1000\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
272	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	2026-07-27_d226a10e49509b733c1528aedfa6493d_elex_wannacry.exe
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

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
272	cmd.exe
2860	PING.EXE
4104	PING.EXE
2176	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2860	PING.EXE
4104	PING.EXE
2176	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2780 wrote to memory of 424	2780	2026-07-27_d226a10e49509b733c1528aedfa6493d_elex_wannacry.exe	90
PID 424 wrote to memory of 272	424	WINWORD.exe	91
PID 272 wrote to memory of 2860	272	cmd.exe	93
PID 272 wrote to memory of 4104	272	cmd.exe	94
PID 272 wrote to memory of 2176	272	cmd.exe	95
PID 272 wrote to memory of 4640	272	cmd.exe	96

C:\Users\Admin\AppData\Local\Temp\2026-07-27_d226a10e49509b733c1528aedfa6493d_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-27_d226a10e49509b733c1528aedfa6493d_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2780
- 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:424
- - 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\00005563" 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:272
  - - 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:2860
  - - 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:4104
  - - 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:2176
  - - 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:4640

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

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Downloads

00005563

Path C:\Users\Admin\AppData\Roaming\Mozilla\00005563
Size 56KB
SHA256 39c58c22d7f7874a8e223282fc418fc536b0015fd19e3c92271fd8d786709f65
MD5 903a8b438a882fba4403c5cb5a6a7462
SHA1 216d7ab12c276a0cea95041f11a4143dc5d0a8b7
SHA512 6ca951229b90118aa389381bd599a184a66ce7c4250fc7067400e407cc33eb9f1823a854e278c99c25e104f86c8e76f18974a4d4da843675dd3b2667957e42f8
SSDEEP 1536:PLsF2Kerc64sTiX2IV0DeRa8OKFVG9WGWf:PLy2Kerc64CiGImqRa8OKFE9WBf
TLSH
T1244319277AE55CD2C15360F0EAE49B308038FD7219279023E794BB9816BEC92DF7169D
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 56KB
SHA256 d8165fb501a93d0100f26d7ad7a634ef51ff2f076c366d9e1b94d8cdcca79ac3
MD5 d226a10e49509b733c1528aedfa6493d
SHA1 464110824dbb4962d1b858cf83d4cbc9b0fec4b7
SHA512 c1643d5c38737b762938df8ec08e04e854bc7e1384c230a3ba86600a560006b7d08d02128ee812bcd7c5f918f9c93f433fd4742161bf354ccc14d6c510f2e258
SSDEEP 1536:PLsF2Kerc64sTiX2IV0DeRa8OKFVG9WGWM:PLy2Kerc64CiGImqRa8OKFE9WBM
TLSH
T1564319277AE55CD2C15360F0EAE49B308038FD7219279023E794BB9816BEC92DF7169D
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/424-12-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/2780-0-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/2780-10-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/4640-15-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/4640-16-0x0000000000400000-0x0000000000422000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads