juko | ac1f3bee66d457244149ba1c00230cefff644d4b34fdedb7c95eb72e0a03589a

General

Target
2026-07-30_37e11baccbd58c04a2317e13b14d3c85_elex_wannacry.exe
Size 56KB
Sample260730-jsfz8atejf
SHA256 ac1f3bee66d457244149ba1c00230cefff644d4b34fdedb7c95eb72e0a03589a
MD5 37e11baccbd58c04a2317e13b14d3c85
SHA1 475a9257e31148fac6748c8c3561922976ee791d
SHA512 c5adf6cdd1fadda607599e867f414880cb6f15193fc02fb5bda8e37bfedad5bbcee521aa22a9aa024b78eddc860fb808861bd60dee9f08e37c8cd442a1ae5f64
SSDEEP 1536:PLsF2Kerc64sTiX2IV0DeRa8OKFVG9WGWZ:PLy2Kerc64CiGImqRa8OKFE9WBZ
TLSH
T1874319277AE55CD2C15360F0EAE49B308038FD7219279023E794BB9816BEC92DF7169D
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/4220-0-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/files/0x000e00000001c485-5.dat	family_juko
behavioral2/memory/4220-9-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/memory/3376-12-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/files/0x000f00000001c486-13.dat	family_juko
behavioral2/memory/4420-15-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/memory/4420-16-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
3376	WINWORD.exe
4420	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-1-5-21-552508041-2681165170-3229858294-1000\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
3812	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	2026-07-30_37e11baccbd58c04a2317e13b14d3c85_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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.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
3812	cmd.exe
4568	PING.EXE
3304	PING.EXE
2900	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4568	PING.EXE
3304	PING.EXE
2900	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4220 wrote to memory of 3376	4220	2026-07-30_37e11baccbd58c04a2317e13b14d3c85_elex_wannacry.exe	89
PID 3376 wrote to memory of 3812	3376	WINWORD.exe	90
PID 3812 wrote to memory of 4568	3812	cmd.exe	92
PID 3812 wrote to memory of 3304	3812	cmd.exe	93
PID 3812 wrote to memory of 2900	3812	cmd.exe	94
PID 3812 wrote to memory of 4420	3812	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-07-30_37e11baccbd58c04a2317e13b14d3c85_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-30_37e11baccbd58c04a2317e13b14d3c85_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4220
- 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:3376
- - 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\00007895" 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:3812
  - - 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:4568
  - - 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:3304
  - - 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:2900
  - - 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:4420

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

00007895

Path C:\Users\Admin\AppData\Roaming\Mozilla\00007895
Size 56KB
SHA256 d0b5af6f76c2e7265434455f4d532baf5a5dd48479bb237e0de908630ba72b2d
MD5 f7674194fc62bd1ea7a68aa5bed2e94e
SHA1 b346bd0405dd353b8beee1214dfead99728c05d4
SHA512 c270eb67e857ffe8a3280be0af196ba2340b21ef0bd1e1c3e895d763a77ff1159b824abac317157d7f16379ee39680d22e9d4cf4f51eb4c7822b1e3e30cee058
SSDEEP 1536:PLsF2Kerc64sTiX2IV0DeRa8OKFVG9WGWd:PLy2Kerc64CiGImqRa8OKFE9WBd
TLSH
T1C94319277AE55CD2C15360F0EAE49B308038FD7219279023E794BB9816BEC92DF7169D
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 56KB
SHA256 ac1f3bee66d457244149ba1c00230cefff644d4b34fdedb7c95eb72e0a03589a
MD5 37e11baccbd58c04a2317e13b14d3c85
SHA1 475a9257e31148fac6748c8c3561922976ee791d
SHA512 c5adf6cdd1fadda607599e867f414880cb6f15193fc02fb5bda8e37bfedad5bbcee521aa22a9aa024b78eddc860fb808861bd60dee9f08e37c8cd442a1ae5f64
SSDEEP 1536:PLsF2Kerc64sTiX2IV0DeRa8OKFVG9WGWZ:PLy2Kerc64CiGImqRa8OKFE9WBZ
TLSH
T1874319277AE55CD2C15360F0EAE49B308038FD7219279023E794BB9816BEC92DF7169D
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/3376-12-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/4220-0-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/4220-9-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/4420-15-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/4420-16-0x0000000000400000-0x0000000000422000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads