juko | 532a885084f1095e591e741ec2defa6c52b33ef66d932128fd61c1904b0292ca

General

Target
2026-08-02_579d95c798c28bda14cb58e9205d679d_elex_wannacry.exe
Size 56KB
Sample260802-1m17mssemg
SHA256 532a885084f1095e591e741ec2defa6c52b33ef66d932128fd61c1904b0292ca
MD5 579d95c798c28bda14cb58e9205d679d
SHA1 9f828f149c3082fd7c67436b5e58be4a1bd45d54
SHA512 ea75d4aead6187dcef6cb3beaa1dc82a89190604f32d97f627635e6b9716692165d3149de0b7a126a26159a9a0cc0e22db07b05cc73d52a9f6d412ded18f12c8
SSDEEP 1536:PLsF2Kerc64sTiX2IV0DeRa8OKFVG9WGW5:PLy2Kerc64CiGImqRa8OKFE9WB5
TLSH
T1274319277AE55CD2C15360F0EAE49B308038FD7219279023E794BB9816BEC92DF7169D
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 7 IoCs

resource	yara_rule
behavioral2/memory/3492-0-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/files/0x000900000001b884-5.dat	family_juko
behavioral2/memory/3492-10-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/memory/3688-12-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/files/0x001000000001c4e1-13.dat	family_juko
behavioral2/memory/3620-15-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/memory/3620-16-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
3688	WINWORD.exe
3620	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-1-5-21-552508041-2681165170-3229858294-1000\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
1700	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	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	2026-08-02_579d95c798c28bda14cb58e9205d679d_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
1700	cmd.exe
1440	PING.EXE
4888	PING.EXE
4116	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
1440	PING.EXE
4888	PING.EXE
4116	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3492 wrote to memory of 3688	3492	2026-08-02_579d95c798c28bda14cb58e9205d679d_elex_wannacry.exe	89
PID 3688 wrote to memory of 1700	3688	WINWORD.exe	90
PID 1700 wrote to memory of 1440	1700	cmd.exe	92
PID 1700 wrote to memory of 4888	1700	cmd.exe	93
PID 1700 wrote to memory of 4116	1700	cmd.exe	94
PID 1700 wrote to memory of 3620	1700	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-02_579d95c798c28bda14cb58e9205d679d_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-02_579d95c798c28bda14cb58e9205d679d_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3492
- 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:3688
- - 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\0000086A" 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:1700
  - - 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:1440
  - - 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:4888
  - - 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:4116
  - - 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:3620

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

0000086A

Path C:\Users\Admin\AppData\Roaming\Mozilla\0000086A
Size 56KB
SHA256 5e4c264b1e2faf2b765932fa2fa47f66661f2c10c65b9cd94121d58d8e224803
MD5 5b75789d4288ca205d14621ccde71ade
SHA1 83238cd2e28efb6f73854ed5d2411710d409188b
SHA512 e4cc13fade0e958d3471132fc5440ad5574c5220b73873e3e1757714d5490e22747b21f12eb983e563e10b430493e03c5193cd2da2a2bf11a9e1b82ab1e5f489
SSDEEP 1536:PLsF2Kerc64sTiX2IV0DeRa8OKFVG9WGWv:PLy2Kerc64CiGImqRa8OKFE9WBv
TLSH
T1B24319277AE55CD2C15360F0EAE49B308038FD7219279023E794BB9816BEC92DF7169D
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 56KB
SHA256 532a885084f1095e591e741ec2defa6c52b33ef66d932128fd61c1904b0292ca
MD5 579d95c798c28bda14cb58e9205d679d
SHA1 9f828f149c3082fd7c67436b5e58be4a1bd45d54
SHA512 ea75d4aead6187dcef6cb3beaa1dc82a89190604f32d97f627635e6b9716692165d3149de0b7a126a26159a9a0cc0e22db07b05cc73d52a9f6d412ded18f12c8
SSDEEP 1536:PLsF2Kerc64sTiX2IV0DeRa8OKFVG9WGW5:PLy2Kerc64CiGImqRa8OKFE9WB5
TLSH
T1274319277AE55CD2C15360F0EAE49B308038FD7219279023E794BB9816BEC92DF7169D
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/3492-0-0x0000000000400000-0x0000000000422000-memory.dmp

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memory/3492-10-0x0000000000400000-0x0000000000422000-memory.dmp

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memory/3620-15-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/3620-16-0x0000000000400000-0x0000000000422000-memory.dmp

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memory/3688-12-0x0000000000400000-0x0000000000422000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads