juko | ece5a21e79a295944621be6ac9ca126ef38beff4dc998e0906230f59593efdcb

General

Target
2026-07-27_7089bdf141bb662498e64453cc625b3b_elex_wannacry.exe
Size 49KB
Sample260727-2s976sfl3t
SHA256 ece5a21e79a295944621be6ac9ca126ef38beff4dc998e0906230f59593efdcb
MD5 7089bdf141bb662498e64453cc625b3b
SHA1 5d3350b16ea131b33e670f7c9e8369fbac65bc39
SHA512 3cba8ad649cf6f6b97df99e07d03afecf931a3d3c78ba3665cb152b685bd9763aa44b81936af2bd060a65af9789c164447505a3b95820350c247ccf5b34f1c87
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2a:VLy2Kerc64CiGImVucp4kojWh2a
TLSH
T105334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
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/4984-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000d00000001c5df-5.dat	family_juko
behavioral2/memory/4984-10-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/4332-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000e00000001c5e0-13.dat	family_juko
behavioral2/memory/4832-15-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/4832-16-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4332	WINWORD.exe
4832	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-1-5-21-1875162379-3804078649-638427191-1000\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
3260	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	2026-07-27_7089bdf141bb662498e64453cc625b3b_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
3260	cmd.exe
2576	PING.EXE
596	PING.EXE
572	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2576	PING.EXE
596	PING.EXE
572	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4984 wrote to memory of 4332	4984	2026-07-27_7089bdf141bb662498e64453cc625b3b_elex_wannacry.exe	89
PID 4332 wrote to memory of 3260	4332	WINWORD.exe	90
PID 3260 wrote to memory of 2576	3260	cmd.exe	92
PID 3260 wrote to memory of 596	3260	cmd.exe	93
PID 3260 wrote to memory of 572	3260	cmd.exe	94
PID 3260 wrote to memory of 4832	3260	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-07-27_7089bdf141bb662498e64453cc625b3b_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-27_7089bdf141bb662498e64453cc625b3b_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4984
- 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:4332
- - 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\00006277" 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:3260
  - - 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:2576
  - - 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:596
  - - 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:572
  - - 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:4832

C:\Windows\system32\svchost.exe
C:\Windows\system32\svchost.exe -k GPSvcGroup
1⤵
PID:3488

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

00006277

Path C:\Users\Admin\AppData\Roaming\Mozilla\00006277
Size 49KB
SHA256 0eaeba5d81daa8f13f3e11b950767ac36f62ddf7afe7c6f573cfa5537880ef31
MD5 c0f53b7861441d5b167bad8c7920d6a9
SHA1 0c5e205a132345dde9a15b57d2ac1235257c1e5d
SHA512 666becc6711ca1a428968d33a78d55ed3d1496ec296da77a1acae27fb78cc56566579ca8eb489374751ce48d4d8d2a2d70ebb6432b0b61ddb5f49ea74caf8179
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2V:VLy2Kerc64CiGImVucp4kojWh2V
TLSH
T11F334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 49KB
SHA256 ece5a21e79a295944621be6ac9ca126ef38beff4dc998e0906230f59593efdcb
MD5 7089bdf141bb662498e64453cc625b3b
SHA1 5d3350b16ea131b33e670f7c9e8369fbac65bc39
SHA512 3cba8ad649cf6f6b97df99e07d03afecf931a3d3c78ba3665cb152b685bd9763aa44b81936af2bd060a65af9789c164447505a3b95820350c247ccf5b34f1c87
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2a:VLy2Kerc64CiGImVucp4kojWh2a
TLSH
T105334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/4332-12-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4832-15-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4832-16-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4984-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4984-10-0x0000000000400000-0x0000000000420000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads