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 7 IoCs

resource	yara_rule
behavioral2/memory/4464-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000b000000011390-5.dat	family_juko
behavioral2/memory/4464-9-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/3420-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000600000001b815-13.dat	family_juko
behavioral2/memory/4564-15-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/4564-16-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
3420	WINWORD.exe
4564	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-1-5-21-1738198120-2966725515-3980530802-1000\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
1840	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	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	2026-08-10_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

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
1272	PING.EXE
2756	PING.EXE
4660	PING.EXE
1840	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
1272	PING.EXE
2756	PING.EXE
4660	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4464 wrote to memory of 3420	4464	2026-08-10_ed0138cc9b70a4e0b443cb7df12636d3_elex_wannacry.exe	89
PID 3420 wrote to memory of 1840	3420	WINWORD.exe	90
PID 1840 wrote to memory of 1272	1840	cmd.exe	92
PID 1840 wrote to memory of 2756	1840	cmd.exe	93
PID 1840 wrote to memory of 4660	1840	cmd.exe	94
PID 1840 wrote to memory of 4564	1840	cmd.exe	95

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⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4464
- 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:3420
- - 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\00003418" 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:1840
  - - 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:1272
  - - 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:2756
  - - 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:4660
  - - 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:4564

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

Loading Replay Monitor...

Downloads

00003418

Path C:\Users\Admin\AppData\Roaming\Mozilla\00003418
Size 49KB
SHA256 877772d176246aea7fed2549b62a50a5a940e3e7309996a200e46f1348f4ae43
MD5 080c1dd688fc3e8373f734099dcc7f6f
SHA1 3412c34367e4c78585f2a36f93897591cefc4fa5
SHA512 ddfe7f59bc2676f1031b5aa4135543533253d395018f3617fef680d3c66a19abccdd4222238028f98774500f4c55ea061e99eeb773e6982c89c23bc0c0274974
SSDEEP 1536:4LsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2s:4Ly2Kerc64CiGImVu8p4kojWh2s
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/3420-12-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4464-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4464-9-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4564-15-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4564-16-0x0000000000400000-0x0000000000420000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

Replay Monitor

Loading Replay Monitor...

Downloads