juko | fee910333425806f5fbf6835a7957decd8c5c531ef6cfc286316f319b04e6d13

General

Target
2026-08-08_cbf8fa6b7202972843a52afbc45837ef_elex_wannacry.exe
Size 49KB
Sample260808-km5basw1ez
SHA256 fee910333425806f5fbf6835a7957decd8c5c531ef6cfc286316f319b04e6d13
MD5 cbf8fa6b7202972843a52afbc45837ef
SHA1 990cc2798af8d95d00d13e3907feb7639b4cdc3a
SHA512 778c23935084424383721047d0d811940c5751130032cc2c4a01b0e15b8484f75297dc45947679e6f9232e27db8dfacab02a1784b3840fcc88543eed5b02ddbc
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2X:VLy2Kerc64CiGImVucp4kojWh2X
TLSH
T1CA334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
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/3556-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000b000000011390-5.dat	family_juko
behavioral2/memory/3556-9-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/5568-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x001100000001c4c3-13.dat	family_juko
behavioral2/memory/2752-15-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/2752-16-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
5568	WINWORD.exe
2752	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
1636	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	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-08-08_cbf8fa6b7202972843a52afbc45837ef_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
1636	cmd.exe
1572	PING.EXE
5844	PING.EXE
2108	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
5844	PING.EXE
2108	PING.EXE
1572	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3556 wrote to memory of 5568	3556	2026-08-08_cbf8fa6b7202972843a52afbc45837ef_elex_wannacry.exe	89
PID 5568 wrote to memory of 1636	5568	WINWORD.exe	90
PID 1636 wrote to memory of 1572	1636	cmd.exe	92
PID 1636 wrote to memory of 5844	1636	cmd.exe	93
PID 1636 wrote to memory of 2108	1636	cmd.exe	94
PID 1636 wrote to memory of 2752	1636	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-08_cbf8fa6b7202972843a52afbc45837ef_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-08_cbf8fa6b7202972843a52afbc45837ef_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3556
- 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:5568
- - 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\000057D1" 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:1636
  - - 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:1572
  - - 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:5844
  - - 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:2108
  - - 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:2752

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

000057D1

Path C:\Users\Admin\AppData\Roaming\Mozilla\000057D1
Size 49KB
SHA256 21ab3711c604cb5e21901c769fabc4a5ffe07c1da6039f553aa18e67eca25612
MD5 bf0c3261b4635d0796660ca578e27ec2
SHA1 0862daa24274936c7942f543de0fdbd5ff38a3d8
SHA512 bba6ed22f4c6418f70e86d29414d43c86a7ba337c5b8f9dea2667f3d4c260d22733499c11e218261eaa25b261f5ed367761031ab5e8805e349f3ce718a28d79a
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2a:VLy2Kerc64CiGImVucp4kojWh2a
TLSH
T166334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 49KB
SHA256 fee910333425806f5fbf6835a7957decd8c5c531ef6cfc286316f319b04e6d13
MD5 cbf8fa6b7202972843a52afbc45837ef
SHA1 990cc2798af8d95d00d13e3907feb7639b4cdc3a
SHA512 778c23935084424383721047d0d811940c5751130032cc2c4a01b0e15b8484f75297dc45947679e6f9232e27db8dfacab02a1784b3840fcc88543eed5b02ddbc
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2X:VLy2Kerc64CiGImVucp4kojWh2X
TLSH
T1CA334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2752-15-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/2752-16-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/3556-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/3556-9-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/5568-12-0x0000000000400000-0x0000000000420000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads