juko | 5a7855674deccd3cc16a90cfd4a7651ada98b4c3da8a0d84bd21c52d58d9ecb7

General

Target
2026-04-25_45eb176a671ae1faa992c68e8db90bb8_elex_wannacry.exe
Size 32KB
Sample260425-bvb52saz4t
SHA256 5a7855674deccd3cc16a90cfd4a7651ada98b4c3da8a0d84bd21c52d58d9ecb7
MD5 45eb176a671ae1faa992c68e8db90bb8
SHA1 ca7fbbe8a3901b6d0872b7bbee5e57bcd9ee6b6c
SHA512 ad7dd1dcbdd751a7bfd85ca1569c4881a59b22c10ad0acdb9e859c17e10bba804f6eb12d3a78b0259384b28da3859c65c6d11f687e30b146e92cd3b6dee42d5b
SSDEEP 768:J9ZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqNNPWQHf7j:ZLsF2Kerc64sTiX2IV0DKy7j
TLSH
T143E23B2B6AA57052C59320F0F9592F34C43D9DB9016BB062F7417B6928B2D63CF71ACE
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/0x000f0000000262c0-4.dat	family_juko
behavioral2/files/0x001a00000002b433-12.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
2800	WINWORD.exe
5260	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-1-5-21-2397528088-2630719772-1129911217-1000\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	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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-04-25_45eb176a671ae1faa992c68e8db90bb8_elex_wannacry.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
2400	PING.EXE
3660	PING.EXE
4068	cmd.exe
3544	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3544	PING.EXE
2400	PING.EXE
3660	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1804 wrote to memory of 2800	1804	2026-04-25_45eb176a671ae1faa992c68e8db90bb8_elex_wannacry.exe	79
PID 2800 wrote to memory of 4068	2800	WINWORD.exe	80
PID 4068 wrote to memory of 3544	4068	cmd.exe	82
PID 4068 wrote to memory of 2400	4068	cmd.exe	83
PID 4068 wrote to memory of 3660	4068	cmd.exe	84
PID 4068 wrote to memory of 5260	4068	cmd.exe	85

C:\Users\Admin\AppData\Local\Temp\2026-04-25_45eb176a671ae1faa992c68e8db90bb8_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-04-25_45eb176a671ae1faa992c68e8db90bb8_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1804
- 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:2800
- - 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\000023AD" 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:4068
  - - 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:3544
  - - 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:2400
  - - 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:3660
  - - 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:5260

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

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Downloads

000023AD

Path C:\Users\Admin\AppData\Roaming\Mozilla\000023AD
Size 32KB
SHA256 06de0cb1fdd5150ed79816bea426ca0d1eeceeda9a948db3022c5878da8fc3b0
MD5 d33576bb56ec4d080776a8a2af8de5fe
SHA1 8daa1d11f5d0846ad1b7d8951d73ce53530f94ba
SHA512 9b0df2e806106809f621b53fdf504ee7657b96fbffc5507227642448b39e227cb0299ceb38b2483aed329082147ac9017bc35d169a54529b42c3795b09b59d56
SSDEEP 768:J9ZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqNNPWQHf7e:ZLsF2Kerc64sTiX2IV0DKy7e
TLSH
T1D6E23B2B6AA57052C59320F0F9592F34C43D9DB9016BB062F7417B6928B2D63CF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 32KB
SHA256 5a7855674deccd3cc16a90cfd4a7651ada98b4c3da8a0d84bd21c52d58d9ecb7
MD5 45eb176a671ae1faa992c68e8db90bb8
SHA1 ca7fbbe8a3901b6d0872b7bbee5e57bcd9ee6b6c
SHA512 ad7dd1dcbdd751a7bfd85ca1569c4881a59b22c10ad0acdb9e859c17e10bba804f6eb12d3a78b0259384b28da3859c65c6d11f687e30b146e92cd3b6dee42d5b
SSDEEP 768:J9ZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqNNPWQHf7j:ZLsF2Kerc64sTiX2IV0DKy7j
TLSH
T143E23B2B6AA57052C59320F0F9592F34C43D9DB9016BB062F7417B6928B2D63CF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads