juko | e512c6a26f90092392b5d1d6926723f4ee06a094c4093c76d74872129848edb7

General

Target
2026-04-25_dc661b5aa06072e0b936cae93a38cea7_elex_wannacry.exe
Size 100KB
Sample260425-jdpntaa17x
SHA256 e512c6a26f90092392b5d1d6926723f4ee06a094c4093c76d74872129848edb7
MD5 dc661b5aa06072e0b936cae93a38cea7
SHA1 2b79b5ca80d6a93a8982704cf75f5bef016a4607
SHA512 48b2ffa60f2b1b199aaa957a827c30ef1405a2d6da8ac00844834313d833de4c99137d72a5b113c7904191f7628d1ab3010ff1fc7060ae74139c133502fb96d3
SSDEEP 1536:FLsF2Kerc64sTiX2IV0DWvYcF0oYtTiZi+Bl/Ss5I7q6kwT4w2fJt:FLy2Kerc64CiGImavYBoHRBcsAUt
TLSH
T1D1A3170533FC6516E5BF67F46AB45520463BBE6A9832D21D6E8435CF1A32B408F20F6B
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/0x001f00000002b18c-4.dat	family_juko
behavioral2/files/0x001b00000002b40c-12.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
3668	WINWORD.exe
648	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-1-5-21-3119821332-640943685-2562343641-1000\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	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-04-25_dc661b5aa06072e0b936cae93a38cea7_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

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
1124	PING.EXE
388	PING.EXE
4836	cmd.exe
4932	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
388	PING.EXE
4932	PING.EXE
1124	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3880 wrote to memory of 3668	3880	2026-04-25_dc661b5aa06072e0b936cae93a38cea7_elex_wannacry.exe	79
PID 3668 wrote to memory of 4836	3668	WINWORD.exe	80
PID 4836 wrote to memory of 4932	4836	cmd.exe	82
PID 4836 wrote to memory of 1124	4836	cmd.exe	83
PID 4836 wrote to memory of 388	4836	cmd.exe	84
PID 4836 wrote to memory of 648	4836	cmd.exe	85

C:\Users\Admin\AppData\Local\Temp\2026-04-25_dc661b5aa06072e0b936cae93a38cea7_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-04-25_dc661b5aa06072e0b936cae93a38cea7_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3880
- 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:3668
- - 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\000075DF" 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:4836
  - - 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:4932
  - - 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:1124
  - - 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:388
  - - 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:648

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

000075DF

Path C:\Users\Admin\AppData\Roaming\Mozilla\000075DF
Size 100KB
SHA256 30f635accc37361cc8520accd25e8102e20323459c8ce415667b9dad89446ef4
MD5 2e6ac7f6c8ac1c088c4c66cd1fde0a4e
SHA1 c1372b7041c283557ddecd7a6f2408951dbaa9be
SHA512 c6181c7f8a4cc628e5d663e4074718da0f957c22523186c2e5fc8642b2dc9dbfbabd6cda690b917d7d1b5a86baa4d9ecfc0352796bf7ad971217f02381785ad1
SSDEEP 1536:FLsF2Kerc64sTiX2IV0DWvYcF0oYtTiZi+Bl/Ss5I7q6kwT4w2fJd:FLy2Kerc64CiGImavYBoHRBcsAUd
TLSH
T119A3170533FC6516E5BF67F46AB45520463BBE6A9832D21D6E8435CF1A32B408F20F6B
MD5 SHA1 SHA512 SSDEEP TLSH

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WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 100KB
SHA256 e512c6a26f90092392b5d1d6926723f4ee06a094c4093c76d74872129848edb7
MD5 dc661b5aa06072e0b936cae93a38cea7
SHA1 2b79b5ca80d6a93a8982704cf75f5bef016a4607
SHA512 48b2ffa60f2b1b199aaa957a827c30ef1405a2d6da8ac00844834313d833de4c99137d72a5b113c7904191f7628d1ab3010ff1fc7060ae74139c133502fb96d3
SSDEEP 1536:FLsF2Kerc64sTiX2IV0DWvYcF0oYtTiZi+Bl/Ss5I7q6kwT4w2fJt:FLy2Kerc64CiGImavYBoHRBcsAUt
TLSH
T1D1A3170533FC6516E5BF67F46AB45520463BBE6A9832D21D6E8435CF1A32B408F20F6B
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