juko | a888241401321b0676c23b90dc004d6cdfc1037989d9a7316c5529d27f8d6aef

General

Target
2026-05-16_90f366aeed93e7e26749634dcf88c5e3_elex_wannacry.exe
Size 32KB
Sample260516-jgqehsbw6z
SHA256 a888241401321b0676c23b90dc004d6cdfc1037989d9a7316c5529d27f8d6aef
MD5 90f366aeed93e7e26749634dcf88c5e3
SHA1 370a298a073e6c6357383b993b94e32a5dae8d2f
SHA512 4dea170ac663c5cd11af363bf454663dbe6640c4493959fe55a4f2b868ee83e5f33c6bcc148fd5b8350eb42851aad7b67154087d0ddc9542dfa75b1d63ae18f4
SSDEEP 768:qZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHp4:OLsF2Kerc64sTiX2IV0Dhu4
TLSH
T153E23A1B2AA17052C59320B0FA991F34C57D4DB6116BB066FB417B6928B2D63CFB0DCE
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/0x00130000000261ad-4.dat	family_juko
behavioral2/files/0x000500000002a692-12.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
2800	WINWORD.exe
4708	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-1-5-21-226940941-599731907-2645636698-1000\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	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	2026-05-16_90f366aeed93e7e26749634dcf88c5e3_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

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
444	PING.EXE
2964	PING.EXE
6056	cmd.exe
1136	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
444	PING.EXE
2964	PING.EXE
1136	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2516 wrote to memory of 2800	2516	2026-05-16_90f366aeed93e7e26749634dcf88c5e3_elex_wannacry.exe	80
PID 2800 wrote to memory of 6056	2800	WINWORD.exe	81
PID 6056 wrote to memory of 1136	6056	cmd.exe	83
PID 6056 wrote to memory of 444	6056	cmd.exe	84
PID 6056 wrote to memory of 2964	6056	cmd.exe	85
PID 6056 wrote to memory of 4708	6056	cmd.exe	86

C:\Users\Admin\AppData\Local\Temp\2026-05-16_90f366aeed93e7e26749634dcf88c5e3_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-16_90f366aeed93e7e26749634dcf88c5e3_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2516
- 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\00000145" 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:6056
  - - 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:1136
  - - 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:444
  - - 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:2964
  - - 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:4708

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

00000145

Path C:\Users\Admin\AppData\Roaming\Mozilla\00000145
Size 32KB
SHA256 81ec360f219ac708771c9b73a841639d3ad882d22c7019afdeb27953dd6c759d
MD5 d7900de0357f8df39b746a0187e8e0bf
SHA1 c6421a5caecfd9d173f254bbb65f947abe78ed06
SHA512 466f0cc2a9595c8924257c6f67dd26fc3c03f3b63326479f26e99b3b925b03e234133c35698ac6efe7d2a286ac77d46f8742a2dce8823bb7cec9e09851fb9cc1
SSDEEP 768:qZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpv:OLsF2Kerc64sTiX2IV0Dhuv
TLSH
T19AE23A1B2AA17052C59320B0FA991F34C57D4CB6116BB066FB417B6928B2D63CFB0DCE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 32KB
SHA256 a888241401321b0676c23b90dc004d6cdfc1037989d9a7316c5529d27f8d6aef
MD5 90f366aeed93e7e26749634dcf88c5e3
SHA1 370a298a073e6c6357383b993b94e32a5dae8d2f
SHA512 4dea170ac663c5cd11af363bf454663dbe6640c4493959fe55a4f2b868ee83e5f33c6bcc148fd5b8350eb42851aad7b67154087d0ddc9542dfa75b1d63ae18f4
SSDEEP 768:qZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHp4:OLsF2Kerc64sTiX2IV0Dhu4
TLSH
T153E23A1B2AA17052C59320B0FA991F34C57D4DB6116BB066FB417B6928B2D63CFB0DCE
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