juko | 933566b7f05d9aa59a5425ce427e16997d41f9481900bf53486ec8aeec9b0441

General

Target
2026-08-30_06a4bdb088213eff82ef00318b17885d_elex_wannacry.exe
Size 64KB
Sample260901-jb653sbf67
SHA256 933566b7f05d9aa59a5425ce427e16997d41f9481900bf53486ec8aeec9b0441
MD5 06a4bdb088213eff82ef00318b17885d
SHA1 c12660edc2751172873ffd12649d1e9409db4b39
SHA512 1f8db10eeaf6c8ffef247d9c1e8326f83cda4d26fd4ac1c1457df5a3eb133a8e6514a9585095ce721150614ae1509ba8e0e5094f664cd8804a741bbcc704938a
SSDEEP 1536:t2LsF2Kerc64sTiX2IV0DOlOy6vlvqxy2dnNJfXlNWbITD/:t2Ly2Kerc64CiGImClOyqlvGdnNJfG8n
TLSH
T18E5338173BE554C2E1E606706DB68F78847BFC704A23D51AB780720E1C75E62DE31BAA
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/0x000e000000019cd9-4.dat	family_juko
behavioral2/files/0x000d00000001c5ca-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
5704	WINWORD.exe
1812	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
1184	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	2026-08-30_06a4bdb088213eff82ef00318b17885d_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
424	PING.EXE
4264	PING.EXE
5780	PING.EXE
1184	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
424	PING.EXE
4264	PING.EXE
5780	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4100 wrote to memory of 5704	4100	2026-08-30_06a4bdb088213eff82ef00318b17885d_elex_wannacry.exe	89
PID 5704 wrote to memory of 1184	5704	WINWORD.exe	90
PID 1184 wrote to memory of 424	1184	cmd.exe	92
PID 1184 wrote to memory of 4264	1184	cmd.exe	93
PID 1184 wrote to memory of 5780	1184	cmd.exe	94
PID 1184 wrote to memory of 1812	1184	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-30_06a4bdb088213eff82ef00318b17885d_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-30_06a4bdb088213eff82ef00318b17885d_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4100
- 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:5704
- - 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\0000513C" 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:1184
  - - 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:424
  - - 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:4264
  - - 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:5780
  - - 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:1812

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

0000513C

Path C:\Users\Admin\AppData\Roaming\Mozilla\0000513C
Size 64KB
SHA256 5f4e6e8a5d334e6233b9585e07195c356219f1d783e87307099addc5b5af9c53
MD5 e7beca9c09cd6b3b1e45f0ef45949fed
SHA1 ac402512ff87f813941a6fe4b1924fb21dee31d2
SHA512 261537498b3d105306f4ad40d1bd2ef1d9eae40a9324649ba15cfeae64bcba01132def94f2dd04016e1ff3e57b62765f1b5519c48a42fe9dc3bb17fa8de6c9f5
SSDEEP 1536:t2LsF2Kerc64sTiX2IV0DOlOy6vlvqxy2dnNJfXlNWbITDp:t2Ly2Kerc64CiGImClOyqlvGdnNJfG8B
TLSH
T1365338173BE554C2E1E606706DB68F78847BFC704A23D51AB780720E1C75E62DE31BAA
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 64KB
SHA256 933566b7f05d9aa59a5425ce427e16997d41f9481900bf53486ec8aeec9b0441
MD5 06a4bdb088213eff82ef00318b17885d
SHA1 c12660edc2751172873ffd12649d1e9409db4b39
SHA512 1f8db10eeaf6c8ffef247d9c1e8326f83cda4d26fd4ac1c1457df5a3eb133a8e6514a9585095ce721150614ae1509ba8e0e5094f664cd8804a741bbcc704938a
SSDEEP 1536:t2LsF2Kerc64sTiX2IV0DOlOy6vlvqxy2dnNJfXlNWbITD/:t2Ly2Kerc64CiGImClOyqlvGdnNJfG8n
TLSH
T18E5338173BE554C2E1E606706DB68F78847BFC704A23D51AB780720E1C75E62DE31BAA
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