juko | 75d968c1de46c467fdf510ade13f9633d2610654a836c4d0b37266ad1a9e8a4f

General

Target
2026-05-29_209f59d180dea6bfd5ffc5514060b28f_elex_wannacry.exe
Size 87KB
Sample260529-2ca35sdt2l
SHA256 75d968c1de46c467fdf510ade13f9633d2610654a836c4d0b37266ad1a9e8a4f
MD5 209f59d180dea6bfd5ffc5514060b28f
SHA1 8c1024e147e898e960a68cc327388647e5bc20d1
SHA512 814ac95abc4220e35d80fe301c8af6d0f26dccbaa94a45a1f2fd0cb10e94614b8d053da6567fe2b8c0a359a02cf3381cb61d158427e8f1389606c98d13b00bf8
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpe:2Ly2Kerc64CiGIm1K851YO6EQkwpe
TLSH
T10493A1763A259190C48BD138E8155AA0B932DCF52FF75303E6417AAC59B1E13CFAE8C6
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
behavioral2/memory/1780-0-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/files/0x001f00000002b2e9-5.dat	family_juko
behavioral2/memory/1780-11-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/3332-14-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/files/0x001d00000002b3c2-15.dat	family_juko
behavioral2/memory/3044-17-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/3044-18-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
3332	WINWORD.exe
3044	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-1-5-21-2824035265-2271499813-2042964211-1000\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	2026-05-29_209f59d180dea6bfd5ffc5514060b28f_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
2396	cmd.exe
1476	PING.EXE
1792	PING.EXE
5028	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
1476	PING.EXE
1792	PING.EXE
5028	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1780 wrote to memory of 3332	1780	2026-05-29_209f59d180dea6bfd5ffc5514060b28f_elex_wannacry.exe	83
PID 3332 wrote to memory of 2396	3332	WINWORD.exe	84
PID 2396 wrote to memory of 1476	2396	cmd.exe	86
PID 2396 wrote to memory of 1792	2396	cmd.exe	87
PID 2396 wrote to memory of 5028	2396	cmd.exe	88
PID 2396 wrote to memory of 3044	2396	cmd.exe	89

C:\Users\Admin\AppData\Local\Temp\2026-05-29_209f59d180dea6bfd5ffc5514060b28f_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-29_209f59d180dea6bfd5ffc5514060b28f_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1780
- 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:3332
- - 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\00000DB4" 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:2396
  - - 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:1476
  - - 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:1792
  - - 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:5028
  - - 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:3044

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

00000DB4

Path C:\Users\Admin\AppData\Roaming\Mozilla\00000DB4
Size 87KB
SHA256 27d8a555f0ce3aa2cfe4305b36f8e4d216476888cb555826c589d90eb98e1c58
MD5 e6e583f3055e1e0e1b0e3f6db38c607e
SHA1 13576aab7b518edb88660b6fc5e484a20eac617a
SHA512 de56b07a33f9bf30c936a20f193843b71721ee87514f85d21128a565106a026873bee6584a0786b22d6935dc1c26e02bbd1e1bbd7fecd4078d1cecbbe6804345
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpz:2Ly2Kerc64CiGIm1K851YO6EQkwpz
TLSH
T17693A1763A259190C48BD178E8155AA0B932DCF53FF71303E6417AAC59B1E13CFAE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 87KB
SHA256 75d968c1de46c467fdf510ade13f9633d2610654a836c4d0b37266ad1a9e8a4f
MD5 209f59d180dea6bfd5ffc5514060b28f
SHA1 8c1024e147e898e960a68cc327388647e5bc20d1
SHA512 814ac95abc4220e35d80fe301c8af6d0f26dccbaa94a45a1f2fd0cb10e94614b8d053da6567fe2b8c0a359a02cf3381cb61d158427e8f1389606c98d13b00bf8
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpe:2Ly2Kerc64CiGIm1K851YO6EQkwpe
TLSH
T10493A1763A259190C48BD138E8155AA0B932DCF52FF75303E6417AAC59B1E13CFAE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1780-0-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/1780-11-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/3044-17-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/3044-18-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/3332-14-0x0000000000400000-0x0000000000425000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads