juko | 79753b9705bb07296058dba23513c0307de38c3723d7e8fca660463160a3dd5b

General

Target
2026-05-02_1c3c3da34ad5a76ccf91dff6e7254778_elex_wannacry.exe
Size 68KB
Sample260502-kap1vabw2x
SHA256 79753b9705bb07296058dba23513c0307de38c3723d7e8fca660463160a3dd5b
MD5 1c3c3da34ad5a76ccf91dff6e7254778
SHA1 0883fcbd84464bc70a5ccaf440e64c9f4c567223
SHA512 b58ada87c5be5723a4723ae9655db47fb132e6f8864692105b0d4b060ea44865ea1eca73d251d9dcf1bd4f9a187383fb171eef2b0ffd7ffccdafc69bb5fa8de3
SSDEEP 768:4ZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHd2LGm4a4RjF+S7wpS:0LsF2Kerc64sTiX2IV0DVk2LGmEQkwpS
TLSH
T16F63A0B629761011C48BD478E8186A60B933DCF53BF75753E3017AA89AB4D138FDE8C6
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/4612-0-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral1/files/0x000a000000021655-5.dat	family_juko
behavioral1/memory/4612-11-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral1/memory/3792-14-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral1/files/0x0009000000024549-15.dat	family_juko
behavioral1/memory/4668-17-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral1/memory/4668-18-0x0000000000400000-0x0000000000425000-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-1-5-21-643422742-1162610606-620613169-1000\Control Panel\International\Geo\Nation	2026-05-02_1c3c3da34ad5a76ccf91dff6e7254778_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-643422742-1162610606-620613169-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
3792	WINWORD.exe
4668	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-1-5-21-643422742-1162610606-620613169-1000\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	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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-05-02_1c3c3da34ad5a76ccf91dff6e7254778_elex_wannacry.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
4584	PING.EXE
5512	cmd.exe
4804	PING.EXE
4744	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4804	PING.EXE
4744	PING.EXE
4584	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4612 wrote to memory of 3792	4612	2026-05-02_1c3c3da34ad5a76ccf91dff6e7254778_elex_wannacry.exe	84
PID 3792 wrote to memory of 5512	3792	WINWORD.exe	85
PID 5512 wrote to memory of 4804	5512	cmd.exe	87
PID 5512 wrote to memory of 4744	5512	cmd.exe	88
PID 5512 wrote to memory of 4584	5512	cmd.exe	89
PID 5512 wrote to memory of 4668	5512	cmd.exe	90

C:\Users\Admin\AppData\Local\Temp\2026-05-02_1c3c3da34ad5a76ccf91dff6e7254778_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-02_1c3c3da34ad5a76ccf91dff6e7254778_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4612
- 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:3792
- - 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\00002608" 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:5512
  - - 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:4804
  - - 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:4744
  - - 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:4584
  - - 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:4668

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

00002608

Path C:\Users\Admin\AppData\Roaming\Mozilla\00002608
Size 68KB
SHA256 57d86d4a3af622d9c843dd03e6eaa102510e8774f5b95ec8cedd6e602881d535
MD5 a12750f4682d9be5ec7b761ecbb1a2cd
SHA1 a96a228e21e2ac1ef3950a79ad33af030b2df2ea
SHA512 cf6fcd64698f535b3a56bb85c69224bb03d0a0f1a007d53e35a7059f1370e06ab4cb5d782a3b5e6750e36125070c8b3b9d542a97b73937f2e43eb4bce9869c0c
SSDEEP 768:4ZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHd2LGm4a4RjF+S7wpH:0LsF2Kerc64sTiX2IV0DVk2LGmEQkwpH
TLSH
T19E63A0B629761011C48BD478E8186A60B933DCF53BF75753E3017AA89AB4D138FDE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 68KB
SHA256 79753b9705bb07296058dba23513c0307de38c3723d7e8fca660463160a3dd5b
MD5 1c3c3da34ad5a76ccf91dff6e7254778
SHA1 0883fcbd84464bc70a5ccaf440e64c9f4c567223
SHA512 b58ada87c5be5723a4723ae9655db47fb132e6f8864692105b0d4b060ea44865ea1eca73d251d9dcf1bd4f9a187383fb171eef2b0ffd7ffccdafc69bb5fa8de3
SSDEEP 768:4ZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHd2LGm4a4RjF+S7wpS:0LsF2Kerc64sTiX2IV0DVk2LGmEQkwpS
TLSH
T16F63A0B629761011C48BD478E8186A60B933DCF53BF75753E3017AA89AB4D138FDE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/3792-14-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/4612-0-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/4612-11-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/4668-17-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/4668-18-0x0000000000400000-0x0000000000425000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads