juko | 65c4b137bafe4aa0381958faaea9c1834104d7c46d20a3bc58b7f7917d1913ec

General

Target
2026-05-04_3109e6316c46a24a1990d695a85b030e_elex_wannacry.exe
Size 53KB
Sample260504-kr7bfse12x
SHA256 65c4b137bafe4aa0381958faaea9c1834104d7c46d20a3bc58b7f7917d1913ec
MD5 3109e6316c46a24a1990d695a85b030e
SHA1 4a6750d0853d5b55f38d75f7b6a16919ce823a68
SHA512 9f8db096ca8896e38c4fcf6b1701ba9a2252627dee850163f6308ec70ac1c3d544f3f9f017753003f6e33202d3bd90c610d37c7424c68f00084d8bf4390094ce
SSDEEP 1536:3LsF2Kerc64sTiX2IV0D5tcz9Kf8pOOq2h:3Ly2Kerc64CiGIm1tcBMUOOFh
TLSH
T1A6335B176A459056C0BB52B0FC884F30823AADB405B7B213B349B65D1CB2E52DFB1DBE
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/0x001300000002ad8a-4.dat	family_juko
behavioral2/files/0x001a00000002b47d-14.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
1032	WINWORD.exe
3092	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	2026-05-04_3109e6316c46a24a1990d695a85b030e_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
5328	PING.EXE
3904	cmd.exe
4764	PING.EXE
4012	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4012	PING.EXE
5328	PING.EXE
4764	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2912 wrote to memory of 1032	2912	2026-05-04_3109e6316c46a24a1990d695a85b030e_elex_wannacry.exe	79
PID 1032 wrote to memory of 3904	1032	WINWORD.exe	80
PID 3904 wrote to memory of 4764	3904	cmd.exe	82
PID 3904 wrote to memory of 4012	3904	cmd.exe	83
PID 3904 wrote to memory of 5328	3904	cmd.exe	84
PID 3904 wrote to memory of 3092	3904	cmd.exe	85

C:\Users\Admin\AppData\Local\Temp\2026-05-04_3109e6316c46a24a1990d695a85b030e_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-04_3109e6316c46a24a1990d695a85b030e_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2912
- 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:1032
- - 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\0000458E" 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:3904
  - - 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:4764
  - - 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:4012
  - - 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:5328
  - - 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:3092

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

0000458E

Path C:\Users\Admin\AppData\Roaming\Mozilla\0000458E
Size 53KB
SHA256 bacfe5a047918208f37d27e6972bab4e002116af91bad50693bb88716847aaa1
MD5 a075210ed50f71d22ae3e842f3163523
SHA1 0c0949a72ee46568d3ac239ac564783a565c8e0b
SHA512 e427f5fe473600d5cfdbb5d509c651d800355a7f750c410404f65aeb258fc2463007bb4839f2af8ce6c50073f3a7244359f4269283b43051eb2e7a0b2de5164f
SSDEEP 1536:3LsF2Kerc64sTiX2IV0D5tcz9Kf8pOOq2M:3Ly2Kerc64CiGIm1tcBMUOOFM
TLSH
T117335C176A459056C0BB52B0FC884F30823AADB405B7B213B349B65D1CB2E52DFB1DBE
MD5 SHA1 SHA512 SSDEEP TLSH

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WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 53KB
SHA256 65c4b137bafe4aa0381958faaea9c1834104d7c46d20a3bc58b7f7917d1913ec
MD5 3109e6316c46a24a1990d695a85b030e
SHA1 4a6750d0853d5b55f38d75f7b6a16919ce823a68
SHA512 9f8db096ca8896e38c4fcf6b1701ba9a2252627dee850163f6308ec70ac1c3d544f3f9f017753003f6e33202d3bd90c610d37c7424c68f00084d8bf4390094ce
SSDEEP 1536:3LsF2Kerc64sTiX2IV0D5tcz9Kf8pOOq2h:3Ly2Kerc64CiGIm1tcBMUOOFh
TLSH
T1A6335B176A459056C0BB52B0FC884F30823AADB405B7B213B349B65D1CB2E52DFB1DBE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1032-13-0x00000000008C0000-0x000000000093C000-memory.dmp

Download

memory/2912-10-0x0000000000830000-0x00000000008AC000-memory.dmp

Download

memory/3092-17-0x0000000002E30000-0x0000000002E37000-memory.dmp

Download

memory/3092-16-0x0000000000990000-0x0000000000A0C000-memory.dmp

Download

memory/3092-20-0x0000000000990000-0x0000000000A0C000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads