juko | 4adcf6b023d84cbfed4ed0ef5b81edad56630fd40848d94d2f297209361f341d

General

Target
2026-06-02_ec539c507317b59601c44c86d3e77f14_elex_wannacry.exe
Size 32KB
Sample260602-hc7bssft5v
SHA256 4adcf6b023d84cbfed4ed0ef5b81edad56630fd40848d94d2f297209361f341d
MD5 ec539c507317b59601c44c86d3e77f14
SHA1 9834fe0d2fb67810dd5a5ca54daec96e3e5cdb87
SHA512 77bf05315148289e1232a2b080ce2f8c9997679835ebc07cd1557584907ec59603e2d134556ee03643c3584ae5872f5c4c96162e32a91bcb21168686bc2c6172
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqXNPWQHbf8:tLsF2Kerc64sTiX2IV0DYQ0
TLSH
T16DE23B2B6AA17052C59320F0F9591F34C43D9DB9116BB0A2F7417B6928B2D63CF71ACE
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/0x001f00000002b377-4.dat	family_juko
behavioral2/files/0x001d00000002b3e9-12.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
2296	WINWORD.exe
4584	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-1-5-21-2824035265-2271499813-2042964211-1000\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	2026-06-02_ec539c507317b59601c44c86d3e77f14_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
3732	PING.EXE
3728	PING.EXE
4424	PING.EXE
3472	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3728	PING.EXE
4424	PING.EXE
3732	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3172 wrote to memory of 2296	3172	2026-06-02_ec539c507317b59601c44c86d3e77f14_elex_wannacry.exe	81
PID 2296 wrote to memory of 3472	2296	WINWORD.exe	82
PID 3472 wrote to memory of 3732	3472	cmd.exe	84
PID 3472 wrote to memory of 3728	3472	cmd.exe	85
PID 3472 wrote to memory of 4424	3472	cmd.exe	86
PID 3472 wrote to memory of 4584	3472	cmd.exe	87

C:\Users\Admin\AppData\Local\Temp\2026-06-02_ec539c507317b59601c44c86d3e77f14_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-06-02_ec539c507317b59601c44c86d3e77f14_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3172
- 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:2296
- - 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\00000D78" 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:3472
  - - 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:3732
  - - 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:3728
  - - 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:4424
  - - 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:4584

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

00000D78

Path C:\Users\Admin\AppData\Roaming\Mozilla\00000D78
Size 32KB
SHA256 9da38205e449771bddc1c70c45c8e765c68c33b42f0b3ac4d9aa4022591952a4
MD5 9677b84748656d61413e9f5cb62df45c
SHA1 69d43822daf80251f824ca3f53653ea4acf875fc
SHA512 756dc0aa07ba0241b35492f7de592dfda474dcfb39fea17945a212e62e0ce869cfa9a97f27afc6e07655ac8fe7edad841c4088410c32fa753de06fe67e6ef594
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqXNPWQHbf5:tLsF2Kerc64sTiX2IV0DYQh
TLSH
T126E23B2B6AA17052C59320F0F9591F34C43D9DB9116BB0A2F7417B6928B2D63CF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 32KB
SHA256 4adcf6b023d84cbfed4ed0ef5b81edad56630fd40848d94d2f297209361f341d
MD5 ec539c507317b59601c44c86d3e77f14
SHA1 9834fe0d2fb67810dd5a5ca54daec96e3e5cdb87
SHA512 77bf05315148289e1232a2b080ce2f8c9997679835ebc07cd1557584907ec59603e2d134556ee03643c3584ae5872f5c4c96162e32a91bcb21168686bc2c6172
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqXNPWQHbf8:tLsF2Kerc64sTiX2IV0DYQ0
TLSH
T16DE23B2B6AA17052C59320F0F9591F34C43D9DB9116BB0A2F7417B6928B2D63CF71ACE
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