juko | de766d05c72d117dd7dc11cf6ff1e9456f0d1145a9ad58bdbbe82458e0bde947

General

Target
2026-04-19_6bb813d0e0d261522d259c85c38602b0_elex_wannacry.exe
Size 30KB
Sample260419-e9yjdacv9m
SHA256 de766d05c72d117dd7dc11cf6ff1e9456f0d1145a9ad58bdbbe82458e0bde947
MD5 6bb813d0e0d261522d259c85c38602b0
SHA1 dc005b926455abf4a7c0e0bae3b530f59ff26ada
SHA512 845959eac7afd4fcbeb5021a887839ab9747409e5d14a403c3328b685409b99c00c7101b011d811a96bb48e99c3077fd285e37d484cbbc0dc4dead1efc0635a0
SSDEEP 768:qZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqkkzNPWQHrp:OLsF2Kerc64sTiX2IV0DkFMp
TLSH
T13BE27D2E3EA28053C5D700F0E9A91F78C97E953B2569A05BCB400E4D3CF1D65DAB1E9E
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/0x002300000002b133-4.dat	family_juko
behavioral2/files/0x001c00000002b24f-11.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
1368	WINWORD.exe
2832	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-1-5-21-3847269522-1618051987-1942096715-1000\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	2026-04-19_6bb813d0e0d261522d259c85c38602b0_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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.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
1412	cmd.exe
1076	PING.EXE
3096	PING.EXE
3164	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
1076	PING.EXE
3096	PING.EXE
3164	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4756 wrote to memory of 1368	4756	2026-04-19_6bb813d0e0d261522d259c85c38602b0_elex_wannacry.exe	80
PID 1368 wrote to memory of 1412	1368	WINWORD.exe	81
PID 1412 wrote to memory of 1076	1412	cmd.exe	83
PID 1412 wrote to memory of 3096	1412	cmd.exe	84
PID 1412 wrote to memory of 3164	1412	cmd.exe	85
PID 1412 wrote to memory of 2832	1412	cmd.exe	86

C:\Users\Admin\AppData\Local\Temp\2026-04-19_6bb813d0e0d261522d259c85c38602b0_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-04-19_6bb813d0e0d261522d259c85c38602b0_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4756
- 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:1368
- - 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\000042C3" 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:1412
  - - 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:1076
  - - 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:3096
  - - 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:3164
  - - 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:2832

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

000042C3

Path C:\Users\Admin\AppData\Roaming\Mozilla\000042C3
Size 30KB
SHA256 43fd338b8780186f554e87df14890b2a9e79ed3b650112fa73310c578e03ab6f
MD5 304021b512c932a1b080438749fd2980
SHA1 f3f7043b33f04043ddd5e2801ffdd3926edb2476
SHA512 dec05e297c221dacc942a448949aedab78c3c28fdd35ad3cf2125972dcb12c2efcf17fd68bae7e057135f034af8b25234e9f6789ebae59210dba600ed57d3f65
SSDEEP 768:qZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqkkzNPWQHrZ:OLsF2Kerc64sTiX2IV0DkFMZ
TLSH
T100E27D2E3EA28053C5D700F0E9A91F78C97E953B2569A05BCB400D4D3CF1D65DAB1E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 30KB
SHA256 de766d05c72d117dd7dc11cf6ff1e9456f0d1145a9ad58bdbbe82458e0bde947
MD5 6bb813d0e0d261522d259c85c38602b0
SHA1 dc005b926455abf4a7c0e0bae3b530f59ff26ada
SHA512 845959eac7afd4fcbeb5021a887839ab9747409e5d14a403c3328b685409b99c00c7101b011d811a96bb48e99c3077fd285e37d484cbbc0dc4dead1efc0635a0
SSDEEP 768:qZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqkkzNPWQHrp:OLsF2Kerc64sTiX2IV0DkFMp
TLSH
T13BE27D2E3EA28053C5D700F0E9A91F78C97E953B2569A05BCB400E4D3CF1D65DAB1E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1368-10-0x00000000021B0000-0x0000000002271000-memory.dmp

Download

memory/2832-13-0x0000000002680000-0x0000000002741000-memory.dmp

Download

memory/4756-8-0x0000000002150000-0x0000000002211000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads