juko | 8690db4666533c54b9b31956f0e9839596fe72cf57dbe1a821f9485923039ea0

General

Target
2026-05-31_c361e60acae3aa7af96d3a900074d566_elex_wannacry.exe
Size 68KB
Sample260531-c7cssagy9w
SHA256 8690db4666533c54b9b31956f0e9839596fe72cf57dbe1a821f9485923039ea0
MD5 c361e60acae3aa7af96d3a900074d566
SHA1 00b65bc6739fd2520f981bdb80fe3945de86d2ef
SHA512 cdaf3328478debbcaa83647525debab14a13e8a101108b20b9a7bb7daf834797a8de5a23fedd2c78a87819c9aa07759a29e9911ddac3f3c27a6a4796f057a080
SSDEEP 768:4ZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHd2LGm4a4RjF+S7wpx:0LsF2Kerc64sTiX2IV0DVk2LGmEQkwpx
TLSH
T12F63A0B629761011C48BD478E8186A60B933CCF53BF75753E3017AA89AB4D138FDE8C6
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/5028-0-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral1/files/0x0008000000024332-5.dat	family_juko
behavioral1/memory/5028-11-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral1/memory/4168-14-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral1/files/0x0009000000024334-15.dat	family_juko
behavioral1/memory/4740-17-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral1/memory/4740-18-0x0000000000400000-0x0000000000425000-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	2026-05-31_c361e60acae3aa7af96d3a900074d566_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
4168	WINWORD.exe
4740	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	2026-05-31_c361e60acae3aa7af96d3a900074d566_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
4824	cmd.exe
1280	PING.EXE
4100	PING.EXE
4172	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
1280	PING.EXE
4100	PING.EXE
4172	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5028 wrote to memory of 4168	5028	2026-05-31_c361e60acae3aa7af96d3a900074d566_elex_wannacry.exe	89
PID 4168 wrote to memory of 4824	4168	WINWORD.exe	91
PID 4824 wrote to memory of 1280	4824	cmd.exe	93
PID 4824 wrote to memory of 4100	4824	cmd.exe	94
PID 4824 wrote to memory of 4172	4824	cmd.exe	95
PID 4824 wrote to memory of 4740	4824	cmd.exe	96

C:\Users\Admin\AppData\Local\Temp\2026-05-31_c361e60acae3aa7af96d3a900074d566_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-31_c361e60acae3aa7af96d3a900074d566_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5028
- 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:4168
- - 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\00007A2D" 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:4824
  - - 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:1280
  - - 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:4100
  - - 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:4172
  - - 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:4740

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

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Downloads

00007A2D

Path C:\Users\Admin\AppData\Roaming\Mozilla\00007A2D
Size 68KB
SHA256 7b442a8137d110a6b574728e9c65a532cc2155cc40f65788dd9bc4f9b5ef672f
MD5 72e8b0c5281016bf03b0ec808c72073a
SHA1 46572fb9d26f746c2b2af7a173720611792f7204
SHA512 1ecfa93854694d950cc35824b1e7886062e5a2cf2e8769641b06e1fafe485c246d280c9ad3ef10af44f165fdc4df9206024a38ad905e40c7b8c52c86b583b0b7
SSDEEP 768:4ZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHd2LGm4a4RjF+S7wpQ:0LsF2Kerc64sTiX2IV0DVk2LGmEQkwpQ
TLSH
T10663A0B629761011C48BD478E8186A60B933CCF53BF75753E3017AA89AB4D138FDE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 68KB
SHA256 8690db4666533c54b9b31956f0e9839596fe72cf57dbe1a821f9485923039ea0
MD5 c361e60acae3aa7af96d3a900074d566
SHA1 00b65bc6739fd2520f981bdb80fe3945de86d2ef
SHA512 cdaf3328478debbcaa83647525debab14a13e8a101108b20b9a7bb7daf834797a8de5a23fedd2c78a87819c9aa07759a29e9911ddac3f3c27a6a4796f057a080
SSDEEP 768:4ZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHd2LGm4a4RjF+S7wpx:0LsF2Kerc64sTiX2IV0DVk2LGmEQkwpx
TLSH
T12F63A0B629761011C48BD478E8186A60B933CCF53BF75753E3017AA89AB4D138FDE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/4168-14-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/4740-17-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/4740-18-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/5028-0-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/5028-11-0x0000000000400000-0x0000000000425000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads