juko | b6b28e7cbe483192371793fc7c9fe66535085d22cfac63b13d4a733c1a9510d6

General

Target
2026-08-04_a5ec97cc8407280540a70efb0a66d50c_elex_wannacry.exe
Size 53KB
Sample260804-gp15waxtcv
SHA256 b6b28e7cbe483192371793fc7c9fe66535085d22cfac63b13d4a733c1a9510d6
MD5 a5ec97cc8407280540a70efb0a66d50c
SHA1 8b820d3e2395e8061b166d83734a0670ff6f6c57
SHA512 3a77967123e21dd65d3b863ca21af3e27dfe13b41af68bd422ce7e24f674752168048a6fbfa846554323b0c14b7929e0434e0ee9808d73587979881b519c8c25
SSDEEP 1536:3LsF2Kerc64sTiX2IV0D5tcz9Kf8pOOq2e:3Ly2Kerc64CiGIm1tcBMUOOFe
TLSH
T154335B176A559056C0BB52B0FC884F30823AADB405B7B213B349B65D1CB2E52DFB1DBE
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/0x000700000001b714-4.dat	family_juko
behavioral2/files/0x001000000001c402-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4064	WINWORD.exe
3596	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
3308	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	2026-08-04_a5ec97cc8407280540a70efb0a66d50c_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
3308	cmd.exe
1712	PING.EXE
2396	PING.EXE
4676	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
1712	PING.EXE
2396	PING.EXE
4676	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1288 wrote to memory of 4064	1288	2026-08-04_a5ec97cc8407280540a70efb0a66d50c_elex_wannacry.exe	89
PID 4064 wrote to memory of 3308	4064	WINWORD.exe	90
PID 3308 wrote to memory of 1712	3308	cmd.exe	92
PID 3308 wrote to memory of 2396	3308	cmd.exe	93
PID 3308 wrote to memory of 4676	3308	cmd.exe	94
PID 3308 wrote to memory of 3596	3308	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-04_a5ec97cc8407280540a70efb0a66d50c_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-04_a5ec97cc8407280540a70efb0a66d50c_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1288
- 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:4064
- - 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\00006144" 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:3308
  - - 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:1712
  - - 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:2396
  - - 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:4676
  - - 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:3596

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

Replay Monitor

Loading Replay Monitor...

Downloads

00006144

Path C:\Users\Admin\AppData\Roaming\Mozilla\00006144
Size 53KB
SHA256 18c25ce26cab96aac2119c6b13dd4e1eb3df34ad6f3912d6e0f5c4090199aac2
MD5 118fcf75d1fbdef425a38a8351b49cb5
SHA1 4733282128ed5e8250b8d72544dfec041f63fe6f
SHA512 48510aaf0ae91708ccb88eaebfb71e892b8fe2a2a6ac2bf88ae690e46d666c1d7b7e2367bff3871ec67b2445161e7188057b14b6efad4fd6d8c0672043e41b4f
SSDEEP 1536:3LsF2Kerc64sTiX2IV0D5tcz9Kf8pOOq2g:3Ly2Kerc64CiGIm1tcBMUOOFg
TLSH
T15F335C176A459056C0BB52B0FC884F30823AADB405B7B213B349B65D1CB2E52DFB1DBE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 53KB
SHA256 b6b28e7cbe483192371793fc7c9fe66535085d22cfac63b13d4a733c1a9510d6
MD5 a5ec97cc8407280540a70efb0a66d50c
SHA1 8b820d3e2395e8061b166d83734a0670ff6f6c57
SHA512 3a77967123e21dd65d3b863ca21af3e27dfe13b41af68bd422ce7e24f674752168048a6fbfa846554323b0c14b7929e0434e0ee9808d73587979881b519c8c25
SSDEEP 1536:3LsF2Kerc64sTiX2IV0D5tcz9Kf8pOOq2e:3Ly2Kerc64CiGIm1tcBMUOOFe
TLSH
T154335B176A559056C0BB52B0FC884F30823AADB405B7B213B349B65D1CB2E52DFB1DBE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

Replay Monitor

Loading Replay Monitor...

Downloads