juko | cf154b6b619531c65258bcda4d61b835333d5183ebb91a2c12062d5d59580849

General

Target
2026-07-01_f66321cd48f1375b7a9520df0be0dcd6_elex_wannacry.exe
Size 37KB
Sample260701-b33b7sdz2x
SHA256 cf154b6b619531c65258bcda4d61b835333d5183ebb91a2c12062d5d59580849
MD5 f66321cd48f1375b7a9520df0be0dcd6
SHA1 f319e99a8cbfaddf3b8f8a3c3d98c1992212fe6c
SHA512 a9ec3e3bc38248936f72c3c6d1975e4ff26189326a83313296f35680f973f9817344c5dfa9d3c265770fae2280ea7326e96565b426dc0ff9f7aa5ac1268cac6d
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpZa5ywa6:3LsF2Kerc64sTiX2IV0DhuogwF
TLSH
T1D4035C1A299160A2D55310B0E9D82FB4C53D8C76106BB062F740BE59A8B3CD7DF72BCE
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 7 IoCs

resource	yara_rule
behavioral2/memory/5828-0-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x00130000000118ff-5.dat	family_juko
behavioral2/memory/5828-10-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/5600-12-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x000e00000001c65b-13.dat	family_juko
behavioral2/memory/6748-15-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/6748-16-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
5600	WINWORD.exe
6748	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	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-07-01_f66321cd48f1375b7a9520df0be0dcd6_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
968	PING.EXE
3352	cmd.exe
3708	PING.EXE
7160	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
968	PING.EXE
3708	PING.EXE
7160	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5828 wrote to memory of 5600	5828	2026-07-01_f66321cd48f1375b7a9520df0be0dcd6_elex_wannacry.exe	89
PID 5600 wrote to memory of 3352	5600	WINWORD.exe	90
PID 3352 wrote to memory of 3708	3352	cmd.exe	92
PID 3352 wrote to memory of 7160	3352	cmd.exe	93
PID 3352 wrote to memory of 968	3352	cmd.exe	94
PID 3352 wrote to memory of 6748	3352	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-07-01_f66321cd48f1375b7a9520df0be0dcd6_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-01_f66321cd48f1375b7a9520df0be0dcd6_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5828
- 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:5600
- - 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\0000112C" 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:3352
  - - 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:3708
  - - 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:7160
  - - 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:968
  - - 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:6748

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

0000112C

Path C:\Users\Admin\AppData\Roaming\Mozilla\0000112C
Size 37KB
SHA256 36911d25bc89544e2f50689f542734d59e59f421ac9a8396c9b932b0dd97c782
MD5 a39d20c352d60eddcefbcfd06d925d68
SHA1 b1fb651ec1ba84289118dffdc503dda0836b4ded
SHA512 81afb3a70a3f105d6022400cc7dfe3ce13271610b6bf272e02101b361738bc4200a8a3bf198c1916a14d97fe49d5790732193b7e69dfb618fcc0b71b1ae7f68a
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpZa5ywao:3LsF2Kerc64sTiX2IV0Dhuogwn
TLSH
T16D035C1A299160A2D55310B0E9D81FB4C53D8C76106BB062F740BE59A8B3CD7DF72BCE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 37KB
SHA256 cf154b6b619531c65258bcda4d61b835333d5183ebb91a2c12062d5d59580849
MD5 f66321cd48f1375b7a9520df0be0dcd6
SHA1 f319e99a8cbfaddf3b8f8a3c3d98c1992212fe6c
SHA512 a9ec3e3bc38248936f72c3c6d1975e4ff26189326a83313296f35680f973f9817344c5dfa9d3c265770fae2280ea7326e96565b426dc0ff9f7aa5ac1268cac6d
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpZa5ywa6:3LsF2Kerc64sTiX2IV0DhuogwF
TLSH
T1D4035C1A299160A2D55310B0E9D82FB4C53D8C76106BB062F740BE59A8B3CD7DF72BCE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/5600-12-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/5828-0-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/5828-10-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/6748-15-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/6748-16-0x0000000000400000-0x000000000041D000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

Replay Monitor

Loading Replay Monitor...

Downloads