juko | 1c90e9e547621079096ce242b225d1dc7deeaa0402b3cb80894fb2b263d0e476

General

Target
2026-06-03_6ad34daee33f73ab0af2fe9940cf3f9a_elex_wannacry.exe
Size 87KB
Sample260603-d71ehsg17t
SHA256 1c90e9e547621079096ce242b225d1dc7deeaa0402b3cb80894fb2b263d0e476
MD5 6ad34daee33f73ab0af2fe9940cf3f9a
SHA1 d7419a1acb00931c9cc4fd1ecb70c3e47902fa03
SHA512 30c8d2acf1e5ccf572db9fa4be098be7a0a30be90dbce31edc0fbd6b0164521b392a343ebaee96f6cb8f494ae8826743636713a83d30e6fdebcbe2ff7ff765c0
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpB:2Ly2Kerc64CiGIm1K851YO6EQkwpB
TLSH
T1EE93A1763A259190C48BD138E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

discovery juko persistence trojan

Malware Config

Signatures

Family: Juko
Juko is a trojan written in C++.
trojan juko

Detects Juko 8 IoCs

resource	yara_rule
behavioral2/memory/2388-0-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/files/0x002200000002b31f-5.dat	family_juko
behavioral2/memory/4688-11-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/2388-12-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/4688-15-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/files/0x001b00000002b51c-16.dat	family_juko
behavioral2/memory/3092-18-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/3092-19-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4688	WINWORD.exe
3092	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-1-5-21-2409539145-3342400454-2096821238-1000\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

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	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-06-03_6ad34daee33f73ab0af2fe9940cf3f9a_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

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
2372	PING.EXE
3000	PING.EXE
3624	PING.EXE
4872	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2372	PING.EXE
3000	PING.EXE
3624	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2388 wrote to memory of 4688	2388	2026-06-03_6ad34daee33f73ab0af2fe9940cf3f9a_elex_wannacry.exe	80
PID 4688 wrote to memory of 4872	4688	WINWORD.exe	81
PID 4872 wrote to memory of 2372	4872	cmd.exe	83
PID 4872 wrote to memory of 3000	4872	cmd.exe	84
PID 4872 wrote to memory of 3624	4872	cmd.exe	85
PID 4872 wrote to memory of 3092	4872	cmd.exe	86

C:\Users\Admin\AppData\Local\Temp\2026-06-03_6ad34daee33f73ab0af2fe9940cf3f9a_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-06-03_6ad34daee33f73ab0af2fe9940cf3f9a_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2388
- 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:4688
- - 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\00004EAF" WINWORD.exe&ping 127.0.0.1 -n 2&"C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" \r
    3⤵
    - System Location Discovery: System Language Discovery
    - System Network Configuration Discovery: Internet Connection Discovery
    - Suspicious use of WriteProcessMemory
    PID:4872
  - - 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:2372
  - - 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:3000
  - - 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:3624
  - - 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:3092

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

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

00004EAF

Path C:\Users\Admin\AppData\Roaming\Mozilla\00004EAF
Size 87KB
SHA256 131e6ef4f22c4cdc3f8e0df242fca039a2692db4d870b082f5e8f7483ae2a5f0
MD5 cf0a558f4fbfcb1bc20119c599a7870c
SHA1 08d5431b2636ae13248b76a3252923ca06f50bfc
SHA512 cb70e3bb5a123d3e57263321cc173acc49020671157a5b98a9961b107d6723285acd6e9ea6fd41e8e215e69832f47b1b1810b0c4f418b469a87e158448d488b2
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwp1:2Ly2Kerc64CiGIm1K851YO6EQkwp1
TLSH
T17693A1763A259190C48BD138E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 87KB
SHA256 1c90e9e547621079096ce242b225d1dc7deeaa0402b3cb80894fb2b263d0e476
MD5 6ad34daee33f73ab0af2fe9940cf3f9a
SHA1 d7419a1acb00931c9cc4fd1ecb70c3e47902fa03
SHA512 30c8d2acf1e5ccf572db9fa4be098be7a0a30be90dbce31edc0fbd6b0164521b392a343ebaee96f6cb8f494ae8826743636713a83d30e6fdebcbe2ff7ff765c0
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpB:2Ly2Kerc64CiGIm1K851YO6EQkwpB
TLSH
T1EE93A1763A259190C48BD138E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2388-0-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/2388-12-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/3092-18-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/3092-19-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/4688-11-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/4688-15-0x0000000000400000-0x0000000000425000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads