juko | 6ac0fc27b2c4f237c151a6d7c86650b88e39956ce84e8d08873d2066ef034981

General

Target
2026-08-05_c19729e4f211ae9272c7d534b038b22f_elex_wannacry.exe
Size 56KB
Sample260805-kz22pstdlf
SHA256 6ac0fc27b2c4f237c151a6d7c86650b88e39956ce84e8d08873d2066ef034981
MD5 c19729e4f211ae9272c7d534b038b22f
SHA1 f1ec20cecaa91c277259b66a36ec655c54f04eab
SHA512 de792a5de3f516b4a945fc7c366947a1c5af8fb6e77ad2ad47660cf66ead6b12ad5fb1a7e94d3a5e46d675502936efc9c574597e15ef316d1711351722cc184d
SSDEEP 1536:PLsF2Kerc64sTiX2IV0DeRa8OKFVG9WGWA:PLy2Kerc64CiGImqRa8OKFE9WBA
TLSH
T1564319277AE55CD2C15360F0EAE49B308038FD7219279023E794BB9816BEC92DF7169D
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/1748-0-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/files/0x000e00000001b89b-5.dat	family_juko
behavioral2/memory/1748-10-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/memory/4260-12-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/files/0x000f00000001c495-13.dat	family_juko
behavioral2/memory/5736-15-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/memory/5736-16-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4260	WINWORD.exe
5736	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-1-5-21-3797332335-34111092-3597280141-1000\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
4692	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	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-08-05_c19729e4f211ae9272c7d534b038b22f_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
4692	cmd.exe
4192	PING.EXE
4124	PING.EXE
5036	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
5036	PING.EXE
4192	PING.EXE
4124	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1748 wrote to memory of 4260	1748	2026-08-05_c19729e4f211ae9272c7d534b038b22f_elex_wannacry.exe	89
PID 4260 wrote to memory of 4692	4260	WINWORD.exe	90
PID 4692 wrote to memory of 4192	4692	cmd.exe	92
PID 4692 wrote to memory of 4124	4692	cmd.exe	93
PID 4692 wrote to memory of 5036	4692	cmd.exe	94
PID 4692 wrote to memory of 5736	4692	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-05_c19729e4f211ae9272c7d534b038b22f_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-05_c19729e4f211ae9272c7d534b038b22f_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1748
- 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:4260
- - 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\000002CB" 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:4692
  - - 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:4192
  - - 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:4124
  - - 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:5036
  - - 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:5736

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

000002CB

Path C:\Users\Admin\AppData\Roaming\Mozilla\000002CB
Size 56KB
SHA256 bbfff72bb1ca8442989c5b11aba0219515ea13faba24b1861901379f644c3ca2
MD5 96085daeedbddc974fb06ad080ae1bbd
SHA1 bb436cba67a34a5e4992af3bcb3bbbf2d571065f
SHA512 310b1cc42d9d63a86383eb6d5727f7bdd8a55589079b8f4f40757e611c3842fec69969ae2664ba4bb31c47ce3bbeeb43f8625d006cc7e74889abca345a60d62c
SSDEEP 1536:PLsF2Kerc64sTiX2IV0DeRa8OKFVG9WGWH:PLy2Kerc64CiGImqRa8OKFE9WBH
TLSH
T17D4319277AE55CD2C15360F0EAE49B308038FD7219279023E794BB9816BEC92DF7169D
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 56KB
SHA256 6ac0fc27b2c4f237c151a6d7c86650b88e39956ce84e8d08873d2066ef034981
MD5 c19729e4f211ae9272c7d534b038b22f
SHA1 f1ec20cecaa91c277259b66a36ec655c54f04eab
SHA512 de792a5de3f516b4a945fc7c366947a1c5af8fb6e77ad2ad47660cf66ead6b12ad5fb1a7e94d3a5e46d675502936efc9c574597e15ef316d1711351722cc184d
SSDEEP 1536:PLsF2Kerc64sTiX2IV0DeRa8OKFVG9WGWA:PLy2Kerc64CiGImqRa8OKFE9WBA
TLSH
T1564319277AE55CD2C15360F0EAE49B308038FD7219279023E794BB9816BEC92DF7169D
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1748-0-0x0000000000400000-0x0000000000422000-memory.dmp

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memory/1748-10-0x0000000000400000-0x0000000000422000-memory.dmp

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memory/4260-12-0x0000000000400000-0x0000000000422000-memory.dmp

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memory/5736-15-0x0000000000400000-0x0000000000422000-memory.dmp

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memory/5736-16-0x0000000000400000-0x0000000000422000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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