juko | 92dc5751e5d4dbe92bfbc5bacf70335d09d8fd0b62de06b8fdd237324a54da92

General

Target
2026-08-04_8c8fd27ab22c793993413ff310dc95ed_elex_wannacry.exe
Size 53KB
Sample260804-seysjsgr9x
SHA256 92dc5751e5d4dbe92bfbc5bacf70335d09d8fd0b62de06b8fdd237324a54da92
MD5 8c8fd27ab22c793993413ff310dc95ed
SHA1 5b088b4f18f1f962d0ee9ee688bf5da4ea51a845
SHA512 4f39b4b6e8e7737cc199a81e845db730253588fcdaebabb007a5e39525ad25384b6543c1ef700eabeef2e1913cfd64cbeca07c8e96a240c6189c124f909f8e21
SSDEEP 1536:3LsF2Kerc64sTiX2IV0D5tcz9Kf8pOOq2j:3Ly2Kerc64CiGIm1tcBMUOOFj
TLSH
T19A335C176A559056C0BB52B0FC884F30823AADB405B7B213B349B65D1CB2E52DFB1DBE
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/0x000800000001b871-4.dat	family_juko
behavioral2/files/0x000f00000001c467-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
2612	WINWORD.exe
2568	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
5316	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	2026-08-04_8c8fd27ab22c793993413ff310dc95ed_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
5108	PING.EXE
4916	PING.EXE
5316	cmd.exe
5852	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
5852	PING.EXE
5108	PING.EXE
4916	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2820 wrote to memory of 2612	2820	2026-08-04_8c8fd27ab22c793993413ff310dc95ed_elex_wannacry.exe	89
PID 2612 wrote to memory of 5316	2612	WINWORD.exe	90
PID 5316 wrote to memory of 5852	5316	cmd.exe	92
PID 5316 wrote to memory of 5108	5316	cmd.exe	93
PID 5316 wrote to memory of 4916	5316	cmd.exe	94
PID 5316 wrote to memory of 2568	5316	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-04_8c8fd27ab22c793993413ff310dc95ed_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-04_8c8fd27ab22c793993413ff310dc95ed_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2820
- 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:2612
- - 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\00007234" 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:5316
  - - 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:5852
  - - 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:5108
  - - 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:4916
  - - 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:2568

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

00007234

Path C:\Users\Admin\AppData\Roaming\Mozilla\00007234
Size 53KB
SHA256 537ec445689f8a918eac50aa5b48a5f27db3054bc9f6c68a30dae353c258f604
MD5 3ac6de1d3a487196cce7f78f2b5bd50c
SHA1 eb4a589862b0200f6dec4e5672bb435add7d4bec
SHA512 8768667bf82d2ccb21c9747262861cd7802e5809745f5dfad2c80b5f6eaefc07b3dc9374fdec3178c9083c1755f2993645d4f1f7beffdb0804fcf1ad4ec1f0a7
SSDEEP 1536:3LsF2Kerc64sTiX2IV0D5tcz9Kf8pOOq2d:3Ly2Kerc64CiGIm1tcBMUOOFd
TLSH
T15C335C176A559056C0BB52B0FC884F30823AADB405B7B213B349B65D1CB2E52DFB1DBE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 53KB
SHA256 92dc5751e5d4dbe92bfbc5bacf70335d09d8fd0b62de06b8fdd237324a54da92
MD5 8c8fd27ab22c793993413ff310dc95ed
SHA1 5b088b4f18f1f962d0ee9ee688bf5da4ea51a845
SHA512 4f39b4b6e8e7737cc199a81e845db730253588fcdaebabb007a5e39525ad25384b6543c1ef700eabeef2e1913cfd64cbeca07c8e96a240c6189c124f909f8e21
SSDEEP 1536:3LsF2Kerc64sTiX2IV0D5tcz9Kf8pOOq2j:3Ly2Kerc64CiGIm1tcBMUOOFj
TLSH
T19A335C176A559056C0BB52B0FC884F30823AADB405B7B213B349B65D1CB2E52DFB1DBE
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