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 7 IoCs

resource	yara_rule
behavioral1/memory/4904-0-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral1/files/0x00080000000243a4-5.dat	family_juko
behavioral1/memory/4904-11-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral1/memory/2592-14-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral1/files/0x000a0000000243a5-15.dat	family_juko
behavioral1/memory/1624-17-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral1/memory/1624-18-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko

Checks computer location settings 2 TTPs 2 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-2370214745-1838013427-2987045292-1000\Control Panel\International\Geo\Nation	2026-06-03_6ad34daee33f73ab0af2fe9940cf3f9a_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2370214745-1838013427-2987045292-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
2592	WINWORD.exe
1624	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-1-5-21-2370214745-1838013427-2987045292-1000\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	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

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
3956	PING.EXE
1656	PING.EXE
1812	PING.EXE
4520	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
1656	PING.EXE
1812	PING.EXE
3956	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4904 wrote to memory of 2592	4904	2026-06-03_6ad34daee33f73ab0af2fe9940cf3f9a_elex_wannacry.exe	90
PID 2592 wrote to memory of 4520	2592	WINWORD.exe	92
PID 4520 wrote to memory of 3956	4520	cmd.exe	94
PID 4520 wrote to memory of 1656	4520	cmd.exe	95
PID 4520 wrote to memory of 1812	4520	cmd.exe	97
PID 4520 wrote to memory of 1624	4520	cmd.exe	98

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⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4904
- C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
  "C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" -r
  2⤵
  - Checks computer location settings
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2592
- - 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\000001CC" 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:4520
  - - 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:3956
  - - 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:1656
  - - 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:1812
  - - 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:1624

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

Query Registry

1

T1012

Remote System Discovery

1

T1018

System Information Discovery

2

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

Replay Monitor

Loading Replay Monitor...

Downloads

000001CC

Path C:\Users\Admin\AppData\Roaming\Mozilla\000001CC
Size 87KB
SHA256 d5b888da98305fe94dd07479f978735f766e9b33e1acf24c9da386393065df60
MD5 d8e1a0996a9eb966f5d01c3d451c7cf8
SHA1 b8cec4eb99b67215239b714f53975b4d5c790264
SHA512 0d70b4d7ec28838e7a21180ba94d17e75fd62db32d93d3132061feedeb97e197c7721bf989a17f2c98008d1a13278dce957ae9645dcb173af8406cd8d32da3ca
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwp2:2Ly2Kerc64CiGIm1K851YO6EQkwp2
TLSH
T17593A1763A259190C48BD138E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
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/1624-17-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/1624-18-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/2592-14-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/4904-0-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/4904-11-0x0000000000400000-0x0000000000425000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

Replay Monitor

Loading Replay Monitor...

Downloads