juko | e7e4ddd863ae10b9cbd1a83becbd08ff8d033e3b9a0ecd3e56d2a13dcb243035

General

Target
2026-08-10_ed0138cc9b70a4e0b443cb7df12636d3_elex_wannacry.exe
Size 49KB
Sample260810-gfaassec95
SHA256 e7e4ddd863ae10b9cbd1a83becbd08ff8d033e3b9a0ecd3e56d2a13dcb243035
MD5 ed0138cc9b70a4e0b443cb7df12636d3
SHA1 4fc32f7e264b147af90fbcff8870c1ff60f03457
SHA512 80fab49053b868d4d0cba7a60f24bfdeb29ab918fcf84e3ab79b9f2d3404c92834d9a55a5d93ccd0fcba238352a432d5a63669713bdf5a90a201be88c64b3252
SSDEEP 1536:4LsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2r:4Ly2Kerc64CiGImVu8p4kojWh2r
TLSH
T11F334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
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 8 IoCs

resource	yara_rule
behavioral1/memory/4836-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/files/0x00210000000231d5-5.dat	family_juko
behavioral1/memory/5340-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/4836-13-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/5340-15-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/files/0x0009000000024696-16.dat	family_juko
behavioral1/memory/4784-18-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/4784-19-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko

Checks computer location settings 2 TTPs 2 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-3053180483-1881419501-3594244048-1000\Control Panel\International\Geo\Nation	2026-08-10_ed0138cc9b70a4e0b443cb7df12636d3_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-3053180483-1881419501-3594244048-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
5340	WINWORD.exe
4784	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-1-5-21-3053180483-1881419501-3594244048-1000\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
5884	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	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-08-10_ed0138cc9b70a4e0b443cb7df12636d3_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

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
2468	PING.EXE
1928	PING.EXE
5676	PING.EXE
5884	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2468	PING.EXE
1928	PING.EXE
5676	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4836 wrote to memory of 5340	4836	2026-08-10_ed0138cc9b70a4e0b443cb7df12636d3_elex_wannacry.exe	86
PID 5340 wrote to memory of 5884	5340	WINWORD.exe	87
PID 5884 wrote to memory of 2468	5884	cmd.exe	89
PID 5884 wrote to memory of 1928	5884	cmd.exe	90
PID 5884 wrote to memory of 5676	5884	cmd.exe	91
PID 5884 wrote to memory of 4784	5884	cmd.exe	92

C:\Users\Admin\AppData\Local\Temp\2026-08-10_ed0138cc9b70a4e0b443cb7df12636d3_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-10_ed0138cc9b70a4e0b443cb7df12636d3_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4836
- C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
  "C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" -r
  2⤵
  - Checks computer location settings
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:5340
- - 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\00005CA4" 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:5884
  - - 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:2468
  - - 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:1928
  - - 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:5676
  - - 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:4784

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

Query Registry

1

T1012

Remote System Discovery

1

T1018

System Information Discovery

2

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

00005CA4

Path C:\Users\Admin\AppData\Roaming\Mozilla\00005CA4
Size 49KB
SHA256 4191ad6865d4009533794d356576bd9a1ede441671a24c75db6b1bcf7216a877
MD5 8a86ede0532124d0cfa315bea9b2837d
SHA1 19a9dc6ae245841e404ef432887361213bc0b476
SHA512 c16523d79b5333ca7f9e54aa2207fecd3291c266ce467d6862c3f1a07c8c3f97b146f754165b92fc93a99b2bcd7a6e152cb6c7ec6295163a9641c40e3f4d77be
SSDEEP 1536:4LsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2D:4Ly2Kerc64CiGImVu8p4kojWh2D
TLSH
T1B7334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 49KB
SHA256 e7e4ddd863ae10b9cbd1a83becbd08ff8d033e3b9a0ecd3e56d2a13dcb243035
MD5 ed0138cc9b70a4e0b443cb7df12636d3
SHA1 4fc32f7e264b147af90fbcff8870c1ff60f03457
SHA512 80fab49053b868d4d0cba7a60f24bfdeb29ab918fcf84e3ab79b9f2d3404c92834d9a55a5d93ccd0fcba238352a432d5a63669713bdf5a90a201be88c64b3252
SSDEEP 1536:4LsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2r:4Ly2Kerc64CiGImVu8p4kojWh2r
TLSH
T11F334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/4784-18-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/4784-19-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/4836-0-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/4836-13-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/5340-12-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/5340-15-0x0000000000400000-0x0000000000420000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads