juko | 3e7556d2f78b46a2b64cb7e217acd73eb7f6ff1eeba1811ba24e40c9416a0753

General

Target
2026-05-08_cb314396c3c000348ffd041eecccf0da_elex_wannacry.exe
Size 61KB
Sample260509-ceagysc14j
SHA256 3e7556d2f78b46a2b64cb7e217acd73eb7f6ff1eeba1811ba24e40c9416a0753
MD5 cb314396c3c000348ffd041eecccf0da
SHA1 1791ee4140538e1bfac6c9bcb8fdc1e5efb7ec72
SHA512 8fb529b2475215e923641cf9695cec186bb92eced8e971433605b62fb44329c60dbff860dc541114afd1957271a9578903888119c64b1eb93171cdfd792f0660
SSDEEP 1536:yLsF2Kerc64sTiX2IV0DZZbyyCwlAY0VdTQs:yLy2Kerc64CiGImVZuyp8Tb
TLSH
T197532C26B950B072D95220B06A6D6B36417A9DF10317A1D3E7407ADD68F2FD2EF306CE
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

discovery 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/3804-0-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/files/0x001400000002707c-5.dat	family_juko
behavioral2/memory/3804-12-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/memory/3908-14-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/files/0x001a00000002b4a8-15.dat	family_juko
behavioral2/memory/4972-17-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/memory/4972-18-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
3908	WINWORD.exe
4972	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-1-5-21-1456842261-3464001825-2855069093-1000\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

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	2026-05-08_cb314396c3c000348ffd041eecccf0da_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
3920	cmd.exe
4332	PING.EXE
3688	PING.EXE
4932	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4332	PING.EXE
3688	PING.EXE
4932	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3804 wrote to memory of 3908	3804	2026-05-08_cb314396c3c000348ffd041eecccf0da_elex_wannacry.exe	79
PID 3908 wrote to memory of 3920	3908	WINWORD.exe	80
PID 3920 wrote to memory of 4332	3920	cmd.exe	82
PID 3920 wrote to memory of 3688	3920	cmd.exe	83
PID 3920 wrote to memory of 4932	3920	cmd.exe	84
PID 3920 wrote to memory of 4972	3920	cmd.exe	85

C:\Users\Admin\AppData\Local\Temp\2026-05-08_cb314396c3c000348ffd041eecccf0da_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-08_cb314396c3c000348ffd041eecccf0da_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3804
- 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:3908
- - 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\00000D26" WINWORD.exe&ping 127.0.0.1 -n 2&"C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" \r
    3⤵
    - System Location Discovery: System Language Discovery
    - System Network Configuration Discovery: Internet Connection Discovery
    - Suspicious use of WriteProcessMemory
    PID:3920
  - - 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:4332
  - - 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:3688
  - - 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:4932
  - - 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:4972

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

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

00000D26

Path C:\Users\Admin\AppData\Roaming\Mozilla\00000D26
Size 61KB
SHA256 9450f9cd1083a46f04ce41ed24fdafc96a39f2a8f5b310b505f45e9bf3f2bc2d
MD5 9857484a68e320335114ca9d7bdca6e5
SHA1 3b6c7b756b42bdce0ddc6b5f44ffcfc3cb48a51b
SHA512 697bd6fbe8cf15cb203e4b3d539479ff90658ce77383ac2fbdf96768acde057bf005fbae54a6300660a2a79a1857c5b22ae902bac9a6c4d07a048fd312c69371
SSDEEP 1536:yLsF2Kerc64sTiX2IV0DZZbyyCwlAY0VdTQ7:yLy2Kerc64CiGImVZuyp8TA
TLSH
T125532C26B950B072D95220B06A6D6B36417A9DF10317A1D3E7407ADC68F2FD2EF306CE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 61KB
SHA256 3e7556d2f78b46a2b64cb7e217acd73eb7f6ff1eeba1811ba24e40c9416a0753
MD5 cb314396c3c000348ffd041eecccf0da
SHA1 1791ee4140538e1bfac6c9bcb8fdc1e5efb7ec72
SHA512 8fb529b2475215e923641cf9695cec186bb92eced8e971433605b62fb44329c60dbff860dc541114afd1957271a9578903888119c64b1eb93171cdfd792f0660
SSDEEP 1536:yLsF2Kerc64sTiX2IV0DZZbyyCwlAY0VdTQs:yLy2Kerc64CiGImVZuyp8Tb
TLSH
T197532C26B950B072D95220B06A6D6B36417A9DF10317A1D3E7407ADD68F2FD2EF306CE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/3804-0-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/3804-12-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/3908-14-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/4972-17-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/4972-18-0x0000000000400000-0x0000000000422000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads