juko | 3db0ae8f6c8feb870f54b3e34a237a769819c240fa4b0104507d87e8c3509f96

General

Target
2026-09-03_f0bce4ed5838ae4fb394f86e9f950763_elex_wannacry.exe
Size 53KB
Sample260903-xrfjysbc33
SHA256 3db0ae8f6c8feb870f54b3e34a237a769819c240fa4b0104507d87e8c3509f96
MD5 f0bce4ed5838ae4fb394f86e9f950763
SHA1 28dc74b3a24ed1dff2210d3f8cea0332ed27e53e
SHA512 7ef0ae37bfd01b767da1b06e83788320d7e6efb75946623c9f63f289bd800d98582f797ea87cd2c55fd6f65223cdb3b6981e30af5c63842f10809ff0865af4bd
SSDEEP 1536:3LsF2Kerc64sTiX2IV0D5tcz9Kf8pOOq2E:3Ly2Kerc64CiGIm1tcBMUOOFE
TLSH
T1CC335C176A459056C0BB52B0FC884F30823AADB405B7B213B349B65D1CB2E52DFB1DBE
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/0x000d00000001c5b0-4.dat	family_juko
behavioral2/files/0x000d00000001c5b1-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
5852	WINWORD.exe
5272	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-1-5-21-2115213192-531537726-3295841909-1000\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
5800	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	2026-09-03_f0bce4ed5838ae4fb394f86e9f950763_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
5800	cmd.exe
5564	PING.EXE
3904	PING.EXE
5032	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
5564	PING.EXE
3904	PING.EXE
5032	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5776 wrote to memory of 5852	5776	2026-09-03_f0bce4ed5838ae4fb394f86e9f950763_elex_wannacry.exe	88
PID 5852 wrote to memory of 5800	5852	WINWORD.exe	89
PID 5800 wrote to memory of 5564	5800	cmd.exe	91
PID 5800 wrote to memory of 3904	5800	cmd.exe	92
PID 5800 wrote to memory of 5032	5800	cmd.exe	93
PID 5800 wrote to memory of 5272	5800	cmd.exe	94

C:\Users\Admin\AppData\Local\Temp\2026-09-03_f0bce4ed5838ae4fb394f86e9f950763_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-09-03_f0bce4ed5838ae4fb394f86e9f950763_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5776
- 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:5852
- - 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\000075FF" 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:5800
  - - 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:5564
  - - 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:3904
  - - 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:5032
  - - 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:5272

C:\Windows\system32\svchost.exe
C:\Windows\system32\svchost.exe -k GPSvcGroup
1⤵
PID:3228

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

000075FF

Path C:\Users\Admin\AppData\Roaming\Mozilla\000075FF
Size 53KB
SHA256 e7268080c0afbaf0713398dd9371be4b98f4c3906f78e042fffc6b0a558a513c
MD5 e2f347a5ab698574ac21a06730d30fea
SHA1 fc60f7ea7edca75edb280ac5073849217a0d0d7c
SHA512 9f0322619d666512779e52d122b73a45a3fcccb0dd0063d09df3fe38fdbad9e11c27c6afb8378a0e4c636759507c42f273717e32c6217959f80fddd97b1fe31b
SSDEEP 1536:3LsF2Kerc64sTiX2IV0D5tcz9Kf8pOOq2F:3Ly2Kerc64CiGIm1tcBMUOOFF
TLSH
T19D335C176A459056C0BB52B0FC884F30823AADB405B7B213B349B65D1CB2E52DFB1DBE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 53KB
SHA256 3db0ae8f6c8feb870f54b3e34a237a769819c240fa4b0104507d87e8c3509f96
MD5 f0bce4ed5838ae4fb394f86e9f950763
SHA1 28dc74b3a24ed1dff2210d3f8cea0332ed27e53e
SHA512 7ef0ae37bfd01b767da1b06e83788320d7e6efb75946623c9f63f289bd800d98582f797ea87cd2c55fd6f65223cdb3b6981e30af5c63842f10809ff0865af4bd
SSDEEP 1536:3LsF2Kerc64sTiX2IV0D5tcz9Kf8pOOq2E:3Ly2Kerc64CiGIm1tcBMUOOFE
TLSH
T1CC335C176A459056C0BB52B0FC884F30823AADB405B7B213B349B65D1CB2E52DFB1DBE
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