juko | ef533e4c3a33652f5e54bda9004ab6dc2fa26d3c68b50adea82b0e4cbf1e6cc3

General

Target
2026-07-01_ebadc606b1cde4d549572909c6a40d8a_elex_wannacry.exe
Size 64KB
Sample260701-b4le3sb14m
SHA256 ef533e4c3a33652f5e54bda9004ab6dc2fa26d3c68b50adea82b0e4cbf1e6cc3
MD5 ebadc606b1cde4d549572909c6a40d8a
SHA1 5e3508c524e225a3787e5b4d90c4526e416af5c6
SHA512 cb574e0f759c736a8628357ef3d38dbbe022a17f2816349eefb74a7a099dc8ad2ee039114ba4c648a440bdef187842d91fbbd315a7a50b24bd9951351768b82a
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/u8:sLy2Kerc64CiGIm8so288
TLSH
T138535C2AA5A220B8C95780B0D5776B32D4397C350036767EA345FF312E71E12EB25E9E
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/0x0013000000011902-4.dat	family_juko
behavioral2/files/0x000f00000001c501-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4236	WINWORD.exe
6520	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-1-5-21-759331733-200834466-1207319849-1000\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	2026-07-01_ebadc606b1cde4d549572909c6a40d8a_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

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
5624	PING.EXE
5580	PING.EXE
5924	cmd.exe
6192	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
6192	PING.EXE
5624	PING.EXE
5580	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5876 wrote to memory of 4236	5876	2026-07-01_ebadc606b1cde4d549572909c6a40d8a_elex_wannacry.exe	89
PID 4236 wrote to memory of 5924	4236	WINWORD.exe	90
PID 5924 wrote to memory of 6192	5924	cmd.exe	92
PID 5924 wrote to memory of 5624	5924	cmd.exe	93
PID 5924 wrote to memory of 5580	5924	cmd.exe	94
PID 5924 wrote to memory of 6520	5924	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-07-01_ebadc606b1cde4d549572909c6a40d8a_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-01_ebadc606b1cde4d549572909c6a40d8a_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5876
- 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:4236
- - 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\00000F9F" 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:5924
  - - 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:6192
  - - 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:5624
  - - 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:5580
  - - 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:6520

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

00000F9F

Path C:\Users\Admin\AppData\Roaming\Mozilla\00000F9F
Size 64KB
SHA256 2db5115560c7f399046b8b28b1889fdc80f178ef7f748e3e0b27c382e92fafd8
MD5 f2eaf59987eb84c5f1e0e7e5c426d900
SHA1 aa5de27c2e75536a1933a98616075544bff90d3c
SHA512 4c6c3d94b359a31946adcfa0cc4614b9973e91d058672cfe86fa32d1adc04b39455cc09a4e506abf20d130ecac11402c43bbfa89c998a1e875356937d939323d
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/u0:sLy2Kerc64CiGIm8so280
TLSH
T1B6535C2AA5A220B8C95780B0D5776B32D4397C350036767EA345FF312E71E12EB25E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 64KB
SHA256 ef533e4c3a33652f5e54bda9004ab6dc2fa26d3c68b50adea82b0e4cbf1e6cc3
MD5 ebadc606b1cde4d549572909c6a40d8a
SHA1 5e3508c524e225a3787e5b4d90c4526e416af5c6
SHA512 cb574e0f759c736a8628357ef3d38dbbe022a17f2816349eefb74a7a099dc8ad2ee039114ba4c648a440bdef187842d91fbbd315a7a50b24bd9951351768b82a
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/u8:sLy2Kerc64CiGIm8so288
TLSH
T138535C2AA5A220B8C95780B0D5776B32D4397C350036767EA345FF312E71E12EB25E9E
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