juko | 4629221f097a14f6a96098981440f1779b94a988dc938dab2d9904c9d8b4beb9

General

Target
2026-08-28_8f039d2fe0b7c46577ce23193e950b86_elex_wannacry.exe
Size 30KB
Sample260828-phacksxsez
SHA256 4629221f097a14f6a96098981440f1779b94a988dc938dab2d9904c9d8b4beb9
MD5 8f039d2fe0b7c46577ce23193e950b86
SHA1 6a9c764edaca2424ad913d4e89ef096a8beb8859
SHA512 42683cc0525c9d73657fe183b817ed3759365be821b592e60780b3a1e82d32b26b501a17744d27265021af508fab744fd30bc14841f6072894e6441ef0ab0f3b
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqz/eNPWQHXv:tLsF2Kerc64sTiX2IV0Dzlov
TLSH
T124E26C3B7EF58052CAD701F0E9692F39C97E913A15299056DB800E4D2CB1DA2DBB1F4E
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/0x000800000001b871-4.dat	family_juko
behavioral2/files/0x000e00000001c46a-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
2668	WINWORD.exe
3040	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-1-5-21-1738198120-2966725515-3980530802-1000\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
4888	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	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	2026-08-28_8f039d2fe0b7c46577ce23193e950b86_elex_wannacry.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
1176	PING.EXE
1808	PING.EXE
4568	PING.EXE
4888	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
1176	PING.EXE
1808	PING.EXE
4568	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2820 wrote to memory of 2668	2820	2026-08-28_8f039d2fe0b7c46577ce23193e950b86_elex_wannacry.exe	89
PID 2668 wrote to memory of 4888	2668	WINWORD.exe	90
PID 4888 wrote to memory of 1176	4888	cmd.exe	92
PID 4888 wrote to memory of 1808	4888	cmd.exe	93
PID 4888 wrote to memory of 4568	4888	cmd.exe	94
PID 4888 wrote to memory of 3040	4888	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-28_8f039d2fe0b7c46577ce23193e950b86_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-28_8f039d2fe0b7c46577ce23193e950b86_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2820
- 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:2668
- - 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\000065A7" 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: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:1176
  - - 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:1808
  - - 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:4568
  - - 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:3040

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

000065A7

Path C:\Users\Admin\AppData\Roaming\Mozilla\000065A7
Size 30KB
SHA256 c494d8324316552782f1229a2f00404ba0a75ef118377cfd3a40daa3942d9320
MD5 41f52f92ddd24e0444ef60827be81b60
SHA1 1385b6451f3a7082617752d42d96f7bf97b79cc6
SHA512 ef095c4724a3166902f634c6f7f40447a24e65ad6211d3bb7efb3d1e5cdf30f812ecbc680f656218b7c14d72d5326c2c0992c2fe009d65c0523aa96d58ce80e1
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqz/eNPWQHX+:tLsF2Kerc64sTiX2IV0Dzlo+
TLSH
T1B1E26C3B7EF58052CAD701F0E9692F39C97E913A15299056DB800E4D2CB1DA2DBB1F4E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 30KB
SHA256 4629221f097a14f6a96098981440f1779b94a988dc938dab2d9904c9d8b4beb9
MD5 8f039d2fe0b7c46577ce23193e950b86
SHA1 6a9c764edaca2424ad913d4e89ef096a8beb8859
SHA512 42683cc0525c9d73657fe183b817ed3759365be821b592e60780b3a1e82d32b26b501a17744d27265021af508fab744fd30bc14841f6072894e6441ef0ab0f3b
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqz/eNPWQHXv:tLsF2Kerc64sTiX2IV0Dzlov
TLSH
T124E26C3B7EF58052CAD701F0E9692F39C97E913A15299056DB800E4D2CB1DA2DBB1F4E
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