juko | 8a737d716baafbdeeece3033f8eca353ab1d6a7b29b1d7f9518b965a6ed79e26

General

Target
2026-07-15_8031280d2841cfd7797fdd14b837ad4e_elex_wannacry.exe
Size 30KB
Sample260715-vesmmscy3x
SHA256 8a737d716baafbdeeece3033f8eca353ab1d6a7b29b1d7f9518b965a6ed79e26
MD5 8031280d2841cfd7797fdd14b837ad4e
SHA1 a95420efc31911c886f17aa2a38ba5f70a03a423
SHA512 c1addf1ae1489391488a516a7b5de628462dcd350a0091de0cae1a200c319537dbc056f0c575ee8f9755f67429aca6b30ad51cb84ea12254794c9f1b84299bfe
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqz/eNPWQHX9:tLsF2Kerc64sTiX2IV0Dzlo9
TLSH
T1FEE26C3B7EF58052CAD701F0E9692F39C97E913A15299056DB800E4D2CB1DA2DBB1F4E
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

discovery 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/0x000600000000053e-4.dat	family_juko
behavioral2/files/0x0005000000016b40-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
5976	WINWORD.exe
1240	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-1-5-21-3797332335-34111092-3597280141-1000\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

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	2026-07-15_8031280d2841cfd7797fdd14b837ad4e_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
4820	cmd.exe
1264	PING.EXE
712	PING.EXE
1348	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
1264	PING.EXE
712	PING.EXE
1348	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1128 wrote to memory of 5976	1128	2026-07-15_8031280d2841cfd7797fdd14b837ad4e_elex_wannacry.exe	87
PID 5976 wrote to memory of 4820	5976	WINWORD.exe	88
PID 4820 wrote to memory of 1264	4820	cmd.exe	90
PID 4820 wrote to memory of 712	4820	cmd.exe	91
PID 4820 wrote to memory of 1348	4820	cmd.exe	92
PID 4820 wrote to memory of 1240	4820	cmd.exe	93

C:\Users\Admin\AppData\Local\Temp\2026-07-15_8031280d2841cfd7797fdd14b837ad4e_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-15_8031280d2841cfd7797fdd14b837ad4e_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1128
- 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:5976
- - 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\00002CE2" WINWORD.exe&ping 127.0.0.1 -n 2&"C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" \r
    3⤵
    - System Location Discovery: System Language Discovery
    - System Network Configuration Discovery: Internet Connection Discovery
    - Suspicious use of WriteProcessMemory
    PID:4820
  - - 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:1264
  - - 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:712
  - - 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:1348
  - - 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:1240

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

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

00002CE2

Path C:\Users\Admin\AppData\Roaming\Mozilla\00002CE2
Size 30KB
SHA256 69779162ab7a39330a5a15d1ba35c717e82b544e853cff716f2ad47bb3003526
MD5 5985de73c0fde5d73fdb89f9ff6de08c
SHA1 484b3e88b035e9557d7b19a9aff47365b8db25d6
SHA512 5cb886216a3180c0bac7bdbacb83e2a16356345f452e43febbae5ec69bafae572ad2c3e9e14392371586590b2fdff515edcaa3121071cc4424c54d0e0a05165a
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqz/eNPWQHXT:tLsF2Kerc64sTiX2IV0DzloT
TLSH
T199E26C3B7EF58052CAD701F0E9692F39C97E913A15299056DB800E4D2CB1DA2DBB1F4E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 30KB
SHA256 8a737d716baafbdeeece3033f8eca353ab1d6a7b29b1d7f9518b965a6ed79e26
MD5 8031280d2841cfd7797fdd14b837ad4e
SHA1 a95420efc31911c886f17aa2a38ba5f70a03a423
SHA512 c1addf1ae1489391488a516a7b5de628462dcd350a0091de0cae1a200c319537dbc056f0c575ee8f9755f67429aca6b30ad51cb84ea12254794c9f1b84299bfe
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqz/eNPWQHX9:tLsF2Kerc64sTiX2IV0Dzlo9
TLSH
T1FEE26C3B7EF58052CAD701F0E9692F39C97E913A15299056DB800E4D2CB1DA2DBB1F4E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

Replay Monitor

Loading Replay Monitor...

Downloads