juko | 4d91bb3646cb2ab572739f32fe8d3681fac18bc3b5486c60f2816a05b2cbe51b

General

Target
2026-05-09_ca83b237444a68f8e4ecd85c7b4bc311_elex_wannacry.exe
Size 88KB
Sample260509-jvsrssc14z
SHA256 4d91bb3646cb2ab572739f32fe8d3681fac18bc3b5486c60f2816a05b2cbe51b
MD5 ca83b237444a68f8e4ecd85c7b4bc311
SHA1 790632fb19bff254365583a5a552dff9a508e6dc
SHA512 e6c5dbfcc2473dc33f7c19d732dc54b6fd1398b0b0dd9afa41a89b2cac37eeda0a4df44cd19da55e30da02aaf96b6128a1ccf07e22b13c3a922f5935e7b6caa4
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrsl:sLy2Kerc64CiGIm8so28wzCBlycJWeea
TLSH
T14A933B2EA5A220FCCA57C170C6BB6B32D4357C251035B63E6344FF352E70E62A729E59
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/0x000d0000000259a4-4.dat	family_juko
behavioral2/files/0x001b00000002b3cf-14.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
772	WINWORD.exe
5024	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	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	2026-05-09_ca83b237444a68f8e4ecd85c7b4bc311_elex_wannacry.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
2720	cmd.exe
5028	PING.EXE
780	PING.EXE
4228	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
5028	PING.EXE
780	PING.EXE
4228	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3680 wrote to memory of 772	3680	2026-05-09_ca83b237444a68f8e4ecd85c7b4bc311_elex_wannacry.exe	79
PID 772 wrote to memory of 2720	772	WINWORD.exe	80
PID 2720 wrote to memory of 5028	2720	cmd.exe	82
PID 2720 wrote to memory of 780	2720	cmd.exe	83
PID 2720 wrote to memory of 4228	2720	cmd.exe	84
PID 2720 wrote to memory of 5024	2720	cmd.exe	85

C:\Users\Admin\AppData\Local\Temp\2026-05-09_ca83b237444a68f8e4ecd85c7b4bc311_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-09_ca83b237444a68f8e4ecd85c7b4bc311_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3680
- 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:772
- - 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\00002818" 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:2720
  - - 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:5028
  - - 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:780
  - - 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:4228
  - - 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:5024

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

00002818

Path C:\Users\Admin\AppData\Roaming\Mozilla\00002818
Size 88KB
SHA256 399a08b68f34a43192b34cb802e8a086908dea90952957c997c76d44f7e06ed1
MD5 c2fe1b56baf07e4f268dfa8638843cff
SHA1 39e4b5c3824cfdeb612deb4fb5bdba9832845dc2
SHA512 a00cec282d1601c9b0eafc4f2ac9e75a22b00ad079af30a52dbc6ee005dd611b601e8dc1f487a984b53f8053081dea8e1fbd21bdc34b9084bc12a8716fae33b3
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrsO:sLy2Kerc64CiGIm8so28wzCBlycJWeeB
TLSH
T147933B2EA5A220FCCA57C170C6BB6B32D4357C251035B63E6344FF352E70E62A729E59
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 88KB
SHA256 4d91bb3646cb2ab572739f32fe8d3681fac18bc3b5486c60f2816a05b2cbe51b
MD5 ca83b237444a68f8e4ecd85c7b4bc311
SHA1 790632fb19bff254365583a5a552dff9a508e6dc
SHA512 e6c5dbfcc2473dc33f7c19d732dc54b6fd1398b0b0dd9afa41a89b2cac37eeda0a4df44cd19da55e30da02aaf96b6128a1ccf07e22b13c3a922f5935e7b6caa4
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrsl:sLy2Kerc64CiGIm8so28wzCBlycJWeea
TLSH
T14A933B2EA5A220FCCA57C170C6BB6B32D4357C251035B63E6344FF352E70E62A729E59
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/772-13-0x0000000000850000-0x00000000008CB000-memory.dmp

Download

memory/3680-11-0x0000000000880000-0x00000000008FB000-memory.dmp

Download

memory/5024-16-0x0000000000970000-0x00000000009EB000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads