juko | 1722c17ae0dcd3fcd2ad087436bd44b2670fef180e1415040214e72702cf0735

General

Target
2026-04-23_4ab8a65469bf807ad2f72413dc383eb3_elex_wannacry.exe
Size 49KB
Sample260423-wpy3vaet61
SHA256 1722c17ae0dcd3fcd2ad087436bd44b2670fef180e1415040214e72702cf0735
MD5 4ab8a65469bf807ad2f72413dc383eb3
SHA1 dccd0ca109d7dd815228faf3841c9c1f1ae4d182
SHA512 0cd08ae11e822c3c220fd922c8921159a850164dc7f39cdfec057ac5ad0cd7c95adf6ced366ed5a1f6285c302e066106dea18093cdd62f078c271dc40d72b777
SSDEEP 1536:VLsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2D:VLy2Kerc64CiGImVu8p4kojWh2D
TLSH
T1E3334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
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/4704-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/files/0x0009000000022e76-5.dat	family_juko
behavioral1/memory/4704-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/3104-14-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/files/0x000800000002429a-15.dat	family_juko
behavioral1/memory/1680-17-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral1/memory/1680-19-0x0000000000400000-0x0000000000420000-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-1-5-21-2714754311-527593155-1440850301-1000\Control Panel\International\Geo\Nation	2026-04-23_4ab8a65469bf807ad2f72413dc383eb3_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2714754311-527593155-1440850301-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
3104	WINWORD.exe
1680	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-1-5-21-2714754311-527593155-1440850301-1000\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	2026-04-23_4ab8a65469bf807ad2f72413dc383eb3_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
1984	cmd.exe
2736	PING.EXE
3896	PING.EXE
1040	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2736	PING.EXE
3896	PING.EXE
1040	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4704 wrote to memory of 3104	4704	2026-04-23_4ab8a65469bf807ad2f72413dc383eb3_elex_wannacry.exe	84
PID 3104 wrote to memory of 1984	3104	WINWORD.exe	85
PID 1984 wrote to memory of 2736	1984	cmd.exe	87
PID 1984 wrote to memory of 3896	1984	cmd.exe	88
PID 1984 wrote to memory of 1040	1984	cmd.exe	89
PID 1984 wrote to memory of 1680	1984	cmd.exe	90

C:\Users\Admin\AppData\Local\Temp\2026-04-23_4ab8a65469bf807ad2f72413dc383eb3_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-04-23_4ab8a65469bf807ad2f72413dc383eb3_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4704
- 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:3104
- - 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\0000586A" 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:1984
  - - 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:2736
  - - 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:3896
  - - 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:1040
  - - 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:1680

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

0000586A

Path C:\Users\Admin\AppData\Roaming\Mozilla\0000586A
Size 49KB
SHA256 86137c82cf3f9da8f955e191e41caa448b0e4b12fdad537cff3445a22f479359
MD5 4f02ab40d4b4abd0dfefe1b5080f7728
SHA1 022dfe38ee1d6665ec4dd1423ee060dc278d4b5a
SHA512 aec02cc3b8b8ad2ed032d5333fbd8ed8455a9c51aadc5d8f07eee7536948872104a226c70934a647ac2f2b289d1493421acf1a3f2541a18ec6f023cacabd27e7
SSDEEP 1536:VLsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h26:VLy2Kerc64CiGImVu8p4kojWh26
TLSH
T1E5334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 49KB
SHA256 1722c17ae0dcd3fcd2ad087436bd44b2670fef180e1415040214e72702cf0735
MD5 4ab8a65469bf807ad2f72413dc383eb3
SHA1 dccd0ca109d7dd815228faf3841c9c1f1ae4d182
SHA512 0cd08ae11e822c3c220fd922c8921159a850164dc7f39cdfec057ac5ad0cd7c95adf6ced366ed5a1f6285c302e066106dea18093cdd62f078c271dc40d72b777
SSDEEP 1536:VLsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2D:VLy2Kerc64CiGImVu8p4kojWh2D
TLSH
T1E3334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1680-17-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/1680-18-0x0000000002A50000-0x0000000002AB3000-memory.dmp

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memory/1680-19-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/3104-14-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4704-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4704-12-0x0000000000400000-0x0000000000420000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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