juko | 4238628b42d057dd1489495a76134b0948c0c5a16fe7dcfea95c296b8f5fd0b6

General

Target
2026-08-02_3b0bf65bf601498b545397000cd0f6cf_elex_wannacry.exe
Size 86KB
Sample260802-1sb5psgl4v
SHA256 4238628b42d057dd1489495a76134b0948c0c5a16fe7dcfea95c296b8f5fd0b6
MD5 3b0bf65bf601498b545397000cd0f6cf
SHA1 d82588f3f3756d8ebb2c2a090c94412b2f0b8b79
SHA512 c665c343b862e417e6c1e236827ad7f5d4c017a2ae202f46becabfd4cabfb0912b0e0f04519e1c27599e03ac8e9872f3ac20b314b91babd40a60f31d30b799b9
SSDEEP 1536:vLsF2Kerc64sTiX2IV0DYPu/ofmEQkwpI:vLy2Kerc64CiGImMPu/ouEQkwpI
TLSH
T1F383C2B2BA365011C48BD538E8189A60B922DCF43BF75753E3417AAC85B4D538FDE8C6
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
behavioral1/memory/3144-0-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral1/files/0x000b00000002423f-5.dat	family_juko
behavioral1/memory/3144-12-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral1/memory/5004-14-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral1/files/0x00080000000243de-15.dat	family_juko
behavioral1/memory/4220-17-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral1/memory/4220-18-0x0000000000400000-0x0000000000425000-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-1-5-21-1788976790-1541110888-1636651838-1000\Control Panel\International\Geo\Nation	2026-08-02_3b0bf65bf601498b545397000cd0f6cf_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-1788976790-1541110888-1636651838-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
5004	WINWORD.exe
4220	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-1-5-21-1788976790-1541110888-1636651838-1000\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
1808	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	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-08-02_3b0bf65bf601498b545397000cd0f6cf_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

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
2828	PING.EXE
1808	cmd.exe
4312	PING.EXE
1536	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4312	PING.EXE
1536	PING.EXE
2828	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3144 wrote to memory of 5004	3144	2026-08-02_3b0bf65bf601498b545397000cd0f6cf_elex_wannacry.exe	84
PID 5004 wrote to memory of 1808	5004	WINWORD.exe	85
PID 1808 wrote to memory of 4312	1808	cmd.exe	87
PID 1808 wrote to memory of 1536	1808	cmd.exe	88
PID 1808 wrote to memory of 2828	1808	cmd.exe	89
PID 1808 wrote to memory of 4220	1808	cmd.exe	90

C:\Users\Admin\AppData\Local\Temp\2026-08-02_3b0bf65bf601498b545397000cd0f6cf_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-02_3b0bf65bf601498b545397000cd0f6cf_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3144
- 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:5004
- - 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\000021E0" 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:1808
  - - 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:4312
  - - 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:1536
  - - 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:2828
  - - 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:4220

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

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

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Downloads

000021E0

Path C:\Users\Admin\AppData\Roaming\Mozilla\000021E0
Size 86KB
SHA256 395224b7d1faceffe67fd3d6e6605df8cc685d2788cfad16f89f840d2b5799af
MD5 d839067f44f5b0dbb8fe002f865175d1
SHA1 0e59f8f4087758f68e01260e9fc7cb5239a80d8a
SHA512 24674181f4fc1f60f2bac92b77915b869b118710a26ed14bb9b6cd72fa7acb9b5a83c9503d514a1f0468d3a6ff91fc523281ddd3d6adc524fdebc7626da7acbf
SSDEEP 1536:vLsF2Kerc64sTiX2IV0DYPu/ofmEQkwpX:vLy2Kerc64CiGImMPu/ouEQkwpX
TLSH
T17683C2B2BA365011C48BD538E8189A60B922DCF43BF75753E3417AAC85B4D538FDE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 86KB
SHA256 4238628b42d057dd1489495a76134b0948c0c5a16fe7dcfea95c296b8f5fd0b6
MD5 3b0bf65bf601498b545397000cd0f6cf
SHA1 d82588f3f3756d8ebb2c2a090c94412b2f0b8b79
SHA512 c665c343b862e417e6c1e236827ad7f5d4c017a2ae202f46becabfd4cabfb0912b0e0f04519e1c27599e03ac8e9872f3ac20b314b91babd40a60f31d30b799b9
SSDEEP 1536:vLsF2Kerc64sTiX2IV0DYPu/ofmEQkwpI:vLy2Kerc64CiGImMPu/ouEQkwpI
TLSH
T1F383C2B2BA365011C48BD538E8189A60B922DCF43BF75753E3417AAC85B4D538FDE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/3144-0-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/3144-12-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/4220-17-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/4220-18-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/5004-14-0x0000000000400000-0x0000000000425000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads