juko | 8bbad35ed5ea27f1b3feaa8fb02a358a46623873e53b9c592a7adc1c71b1f6e2

General

Target
2026-07-05_ba333bbdd381bac063bb4a411bfe43c7_elex_wannacry.exe
Size 216KB
Sample260705-tdd77adv8v
SHA256 8bbad35ed5ea27f1b3feaa8fb02a358a46623873e53b9c592a7adc1c71b1f6e2
MD5 ba333bbdd381bac063bb4a411bfe43c7
SHA1 c1015d3054ba67ca6bd441d1e97a936a63fe6e6f
SHA512 c71fa30dfe423f68ce68c9443c8e09301697a98c2c7ef3f9c50a9293acca5d0150255515fa107ec82f66fa46bb65915505eba561dff2915753d72c0f7e03794b
SSDEEP 3072:uLy2Kerc64CiGImRRLytU+3ZZYRGILCSihxnQDhGgb:uLy2Kwc64YIcyjIDLCSiDaQ4
TLSH
T12A240A2B905330ACDA1782BCD7EA9671E4747CA41532BD7D5B28FA302F31C616F7A858
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 7 IoCs

resource	yara_rule
behavioral2/memory/5896-0-0x0000000000400000-0x0000000000436000-memory.dmp	family_juko
behavioral2/files/0x0011000000006912-5.dat	family_juko
behavioral2/memory/5896-9-0x0000000000400000-0x0000000000436000-memory.dmp	family_juko
behavioral2/memory/4656-12-0x0000000000400000-0x0000000000436000-memory.dmp	family_juko
behavioral2/files/0x0009000000016d03-13.dat	family_juko
behavioral2/memory/3172-15-0x0000000000400000-0x0000000000436000-memory.dmp	family_juko
behavioral2/memory/3172-16-0x0000000000400000-0x0000000000436000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4656	WINWORD.exe
3172	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-1-5-21-3047816590-610495838-277027736-1000\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	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-07-05_ba333bbdd381bac063bb4a411bfe43c7_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

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
2688	cmd.exe
2080	PING.EXE
2576	PING.EXE
1696	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2080	PING.EXE
2576	PING.EXE
1696	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5896 wrote to memory of 4656	5896	2026-07-05_ba333bbdd381bac063bb4a411bfe43c7_elex_wannacry.exe	88
PID 4656 wrote to memory of 2688	4656	WINWORD.exe	89
PID 2688 wrote to memory of 2080	2688	cmd.exe	91
PID 2688 wrote to memory of 2576	2688	cmd.exe	92
PID 2688 wrote to memory of 1696	2688	cmd.exe	93
PID 2688 wrote to memory of 3172	2688	cmd.exe	94

C:\Users\Admin\AppData\Local\Temp\2026-07-05_ba333bbdd381bac063bb4a411bfe43c7_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-05_ba333bbdd381bac063bb4a411bfe43c7_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5896
- 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:4656
- - 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\000060F1" 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:2688
  - - 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:2080
  - - 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:2576
  - - 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:1696
  - - 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:3172

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

000060F1

Path C:\Users\Admin\AppData\Roaming\Mozilla\000060F1
Size 216KB
SHA256 2b1e79632eba515fa996247db138614da0e1eb11a813a632e57ef57051a1ffff
MD5 86d19d942e4284366630a8309fdc32e9
SHA1 34bf22948980c71271a9c956cedd0d6769bc797b
SHA512 a47d7fd762a1edbd9154263c37e47cc66cc60767fb31cf1c3b4856894e8cd011b69df4bef523f66f3f74aac2bbe27a9be907978316396ed3bc1f9038fb3d5d53
SSDEEP 3072:uLy2Kerc64CiGImRRLytU+3ZZYRGILCSihxnQDhGgY:uLy2Kwc64YIcyjIDLCSiDaQj
TLSH
T111240A2B905330ACDA1782BCD7EA9671E4747CA41532BD7D5B28FA302F31C616F7A858
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 216KB
SHA256 8bbad35ed5ea27f1b3feaa8fb02a358a46623873e53b9c592a7adc1c71b1f6e2
MD5 ba333bbdd381bac063bb4a411bfe43c7
SHA1 c1015d3054ba67ca6bd441d1e97a936a63fe6e6f
SHA512 c71fa30dfe423f68ce68c9443c8e09301697a98c2c7ef3f9c50a9293acca5d0150255515fa107ec82f66fa46bb65915505eba561dff2915753d72c0f7e03794b
SSDEEP 3072:uLy2Kerc64CiGImRRLytU+3ZZYRGILCSihxnQDhGgb:uLy2Kwc64YIcyjIDLCSiDaQ4
TLSH
T12A240A2B905330ACDA1782BCD7EA9671E4747CA41532BD7D5B28FA302F31C616F7A858
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/3172-15-0x0000000000400000-0x0000000000436000-memory.dmp

Download

memory/3172-16-0x0000000000400000-0x0000000000436000-memory.dmp

Download

memory/4656-12-0x0000000000400000-0x0000000000436000-memory.dmp

Download

memory/5896-0-0x0000000000400000-0x0000000000436000-memory.dmp

Download

memory/5896-9-0x0000000000400000-0x0000000000436000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads