juko | 1f3c74e483ad4159a1b64d072585a7485733058ec86d072dc9ed37b2bdadd342

General

Target
2026-08-02_3e4abe1299b8f8ba478e333b01b30362_elex_wannacry.exe
Size 30KB
Sample260802-nzd7esaj2s
SHA256 1f3c74e483ad4159a1b64d072585a7485733058ec86d072dc9ed37b2bdadd342
MD5 3e4abe1299b8f8ba478e333b01b30362
SHA1 ff68b389291be38b77ab424c0b46256a87146f1e
SHA512 6a3dfd3990fae1e1c916fa703a82c0aac53d8f9e769a4511da3dc4ff5796b7b2bbe240bc04f0393f1a647d9a7627453d97d54624a16cc06054c1b1ffdf4e80e6
SSDEEP 768:qZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqaNPWQHF:OLsF2Kerc64sTiX2IV0Dx6
TLSH
T1AFE27D3B7EA5C0A2C9D600F0F96D2F38C97E913A16399442CB400D4D3CB5DA6DAB1E4E
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

discovery execution 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/0x0008000000011394-4.dat	family_juko
behavioral2/files/0x000d00000001c550-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
5112	WINWORD.exe
5016	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-1-5-21-3989226554-2204910950-1522900112-1000\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

Executes a command shell one-liner 1 TTPs 1 IoCs

Execution of a cmd.exe one-liner (/c "close" or /k "keep") is a common script/loader stage.

execution

Windows Command Shell

T1059.003

pid	Process
4444	cmd.exe

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	2026-08-02_3e4abe1299b8f8ba478e333b01b30362_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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	PING.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
4444	cmd.exe
1160	PING.EXE
1608	PING.EXE
1528	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
1160	PING.EXE
1608	PING.EXE
1528	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4500 wrote to memory of 5112	4500	2026-08-02_3e4abe1299b8f8ba478e333b01b30362_elex_wannacry.exe	89
PID 5112 wrote to memory of 4444	5112	WINWORD.exe	90
PID 4444 wrote to memory of 1160	4444	cmd.exe	92
PID 4444 wrote to memory of 1608	4444	cmd.exe	93
PID 4444 wrote to memory of 1528	4444	cmd.exe	94
PID 4444 wrote to memory of 5016	4444	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-02_3e4abe1299b8f8ba478e333b01b30362_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-02_3e4abe1299b8f8ba478e333b01b30362_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4500
- 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:5112
- - 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\000017CD" WINWORD.exe&ping 127.0.0.1 -n 2&"C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" \r
    3⤵
    - Executes a command shell one-liner
    - System Location Discovery: System Language Discovery
    - System Network Configuration Discovery: Internet Connection Discovery
    - Suspicious use of WriteProcessMemory
    PID:4444
  - - 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:1160
  - - 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:1608
  - - 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:1528
  - - 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:5016

C:\Windows\system32\svchost.exe
C:\Windows\system32\svchost.exe -k GPSvcGroup
1⤵
PID:2876

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

Windows Command Shell

1

T1059.003

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

000017CD

Path C:\Users\Admin\AppData\Roaming\Mozilla\000017CD
Size 30KB
SHA256 e743a5c72a6b81fd174fbaa3b51b6c792ca7b237bd7d42428ce0c474dc51913a
MD5 ca9c99ee80bf07bd09c9be4f89f83ced
SHA1 8a6f338ab156d18cc5f2c74c2007e8bf5e7c5f51
SHA512 e95777fcba46f1a613bcf1b3313bd740d73e49ca67f3556093046679b738c77f191cc05906b3fb2b6980b10f3b5064788654861d73094da44e360f8d250b4502
SSDEEP 768:qZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqaNPWQHq:OLsF2Kerc64sTiX2IV0Dx5
TLSH
T102E27D3B7EA5C0A2C9D601F0F96D2F38C97E913A16399442CB400D4D3CB5DA6DAB1E4E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 30KB
SHA256 1f3c74e483ad4159a1b64d072585a7485733058ec86d072dc9ed37b2bdadd342
MD5 3e4abe1299b8f8ba478e333b01b30362
SHA1 ff68b389291be38b77ab424c0b46256a87146f1e
SHA512 6a3dfd3990fae1e1c916fa703a82c0aac53d8f9e769a4511da3dc4ff5796b7b2bbe240bc04f0393f1a647d9a7627453d97d54624a16cc06054c1b1ffdf4e80e6
SSDEEP 768:qZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqaNPWQHF:OLsF2Kerc64sTiX2IV0Dx6
TLSH
T1AFE27D3B7EA5C0A2C9D600F0F96D2F38C97E913A16399442CB400D4D3CB5DA6DAB1E4E
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