juko | 808f8cc1c6131d0ac11202248a2daaf467a3388df49d87e845fd0e04934ccb0a

General

Target
2026-07-27_95f6e6997e40bd9dc0732ebf5fdedefa_elex_wannacry.exe
Size 87KB
Sample260727-rrv2ravvht
SHA256 808f8cc1c6131d0ac11202248a2daaf467a3388df49d87e845fd0e04934ccb0a
MD5 95f6e6997e40bd9dc0732ebf5fdedefa
SHA1 5d4c054867695b165f329fb6add5f930d644dae8
SHA512 452bbc11f2bff2cd54f9208e89ea7bbe2ab574ee549b341c94d060c2c5cad781c6c3225161f433889f556c758a13f39e441c14297fd013ca333a869a99b0b46c
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpS:2Ly2Kerc64CiGIm1K851YO6EQkwpS
TLSH
T12E93A1763A259190C48BD138E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
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/2932-0-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/files/0x000700000001b850-5.dat	family_juko
behavioral2/memory/2932-9-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/3204-12-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/files/0x000e00000001c5d0-13.dat	family_juko
behavioral2/memory/1740-15-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/1740-16-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
3204	WINWORD.exe
1740	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-1-5-21-2246396966-3025826688-3847171515-1000\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
808	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	2026-07-27_95f6e6997e40bd9dc0732ebf5fdedefa_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
2528	PING.EXE
2032	PING.EXE
808	cmd.exe
3804	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3804	PING.EXE
2528	PING.EXE
2032	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2932 wrote to memory of 3204	2932	2026-07-27_95f6e6997e40bd9dc0732ebf5fdedefa_elex_wannacry.exe	89
PID 3204 wrote to memory of 808	3204	WINWORD.exe	90
PID 808 wrote to memory of 3804	808	cmd.exe	92
PID 808 wrote to memory of 2528	808	cmd.exe	93
PID 808 wrote to memory of 2032	808	cmd.exe	94
PID 808 wrote to memory of 1740	808	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-07-27_95f6e6997e40bd9dc0732ebf5fdedefa_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-27_95f6e6997e40bd9dc0732ebf5fdedefa_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2932
- 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:3204
- - 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\000067EC" 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:808
  - - 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:3804
  - - 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:2528
  - - 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:2032
  - - 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:1740

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

000067EC

Path C:\Users\Admin\AppData\Roaming\Mozilla\000067EC
Size 87KB
SHA256 e33008e3acbc1e4a6f87ae8fb2bc336b974763288afe6859b7febd4da4498624
MD5 51460d86f282ef1b8bcced81298be85b
SHA1 b033b01877af41e195baf272257d10947439271a
SHA512 df416aeb30aad3f40f23892a22012c5c8e605029a0cba105e6364ae7a119c17c48e0984e5a5caaa22c8d6e4540272e7ad8908c78dfd52f2e49a48140ecf747ad
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpf:2Ly2Kerc64CiGIm1K851YO6EQkwpf
TLSH
T1A293A1763A259190C48BD178E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 87KB
SHA256 808f8cc1c6131d0ac11202248a2daaf467a3388df49d87e845fd0e04934ccb0a
MD5 95f6e6997e40bd9dc0732ebf5fdedefa
SHA1 5d4c054867695b165f329fb6add5f930d644dae8
SHA512 452bbc11f2bff2cd54f9208e89ea7bbe2ab574ee549b341c94d060c2c5cad781c6c3225161f433889f556c758a13f39e441c14297fd013ca333a869a99b0b46c
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpS:2Ly2Kerc64CiGIm1K851YO6EQkwpS
TLSH
T12E93A1763A259190C48BD138E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1740-15-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/1740-16-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/2932-0-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/2932-9-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/3204-12-0x0000000000400000-0x0000000000425000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads