juko | 79dc3abc1a2af4e3643a4bfc0c5d86c86ee215bccea4bebff9f6d458879f8555

General

Target
2026-08-02_a4978282bfb0cb68401358b126ad11b3_elex_wannacry.exe
Size 53KB
Sample260802-m6p2ts1fmg
SHA256 79dc3abc1a2af4e3643a4bfc0c5d86c86ee215bccea4bebff9f6d458879f8555
MD5 a4978282bfb0cb68401358b126ad11b3
SHA1 e007ecd856356bef527b56b9e61ad619bcfff9d4
SHA512 df7920d4599c6e616d621a1834dd7a3ac5741c3a28f91fae6ce641935e526e9bfccbf79a903afec0ee891a7790636020a2cd7489ab82b9bded64aea6867300d9
SSDEEP 1536:3LsF2Kerc64sTiX2IV0D5tcz9Kf8pOOq2X:3Ly2Kerc64CiGIm1tcBMUOOFX
TLSH
T127335C176A459056C0BB52B0FC884F30823AADB405B7B213B349B65D1CB2E52DFB1DBE
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/0x000900000001b884-4.dat	family_juko
behavioral2/files/0x000d00000001c53d-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
1880	WINWORD.exe
3176	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
4328	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	2026-08-02_a4978282bfb0cb68401358b126ad11b3_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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	PING.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
4328	cmd.exe
3716	PING.EXE
6116	PING.EXE
5312	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3716	PING.EXE
6116	PING.EXE
5312	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5000 wrote to memory of 1880	5000	2026-08-02_a4978282bfb0cb68401358b126ad11b3_elex_wannacry.exe	89
PID 1880 wrote to memory of 4328	1880	WINWORD.exe	90
PID 4328 wrote to memory of 3716	4328	cmd.exe	92
PID 4328 wrote to memory of 6116	4328	cmd.exe	93
PID 4328 wrote to memory of 5312	4328	cmd.exe	94
PID 4328 wrote to memory of 3176	4328	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-02_a4978282bfb0cb68401358b126ad11b3_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-02_a4978282bfb0cb68401358b126ad11b3_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5000
- 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:1880
- - 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\00007C49" 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:4328
  - - 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:3716
  - - 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:6116
  - - 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:5312
  - - 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:3176

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

00007C49

Path C:\Users\Admin\AppData\Roaming\Mozilla\00007C49
Size 53KB
SHA256 ee0afd94fc39da893303a390d9e0fb33801416c3b9706631248f8ccd8ba8d4c4
MD5 7b4183fe37feb460b53139cb4e6ddc44
SHA1 8e5fadbd0e2896bc45538885bd890054240acb0d
SHA512 23f53a889eab620f83415009e48b297f007dcd6d8d0fd98a06ec2fbe6c951d0088cffbd6d681f054f81e092337e58b4056c54a4c0246588009e0e4e7ef64d2dd
SSDEEP 1536:3LsF2Kerc64sTiX2IV0D5tcz9Kf8pOOq27:3Ly2Kerc64CiGIm1tcBMUOOF7
TLSH
T117335C176A459056C0BB52B0FC884F30823AADB405B7B213B349B65D1CB2E52DFB1DBE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 53KB
SHA256 79dc3abc1a2af4e3643a4bfc0c5d86c86ee215bccea4bebff9f6d458879f8555
MD5 a4978282bfb0cb68401358b126ad11b3
SHA1 e007ecd856356bef527b56b9e61ad619bcfff9d4
SHA512 df7920d4599c6e616d621a1834dd7a3ac5741c3a28f91fae6ce641935e526e9bfccbf79a903afec0ee891a7790636020a2cd7489ab82b9bded64aea6867300d9
SSDEEP 1536:3LsF2Kerc64sTiX2IV0D5tcz9Kf8pOOq2X:3Ly2Kerc64CiGIm1tcBMUOOFX
TLSH
T127335C176A459056C0BB52B0FC884F30823AADB405B7B213B349B65D1CB2E52DFB1DBE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads