juko | 6e40ed2421f205ae79b8a8638bc58f8d92179dd94c3f7f2c38808156749837cc

General

Target
2026-06-02_8b440ded88cb5d9c4304e07cea00f412_elex_wannacry.exe
Size 57KB
Sample260602-v7fhsabw91
SHA256 6e40ed2421f205ae79b8a8638bc58f8d92179dd94c3f7f2c38808156749837cc
MD5 8b440ded88cb5d9c4304e07cea00f412
SHA1 d11675418fefe809d5ee88cea32cd0ebe9257020
SHA512 ac563cd6056d14e003b920170aad02785627aae42308aa11199aaec01c4509adcf3915e3f7bc0ff4cdef6ebe728f97e64fb8da0087acd8ae01cabb461ee0911e
SSDEEP 1536:zcLsF2Kerc64sTiX2IV0DgsfrfWJF2+BD9DmqaN:wLy2Kerc64CiGImEsoDfaN
TLSH
T172433913366414D1D8BB2138A4025E354BB8BDB21467F622B750BA1E1D779DACFAC3CE
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/4108-0-0x0000000000400000-0x000000000041F000-memory.dmp	family_juko
behavioral2/files/0x002500000002b367-5.dat	family_juko
behavioral2/memory/4108-11-0x0000000000400000-0x000000000041F000-memory.dmp	family_juko
behavioral2/memory/4356-14-0x0000000000400000-0x000000000041F000-memory.dmp	family_juko
behavioral2/files/0x002000000002b42e-15.dat	family_juko
behavioral2/memory/3040-17-0x0000000000400000-0x000000000041F000-memory.dmp	family_juko
behavioral2/memory/3040-18-0x0000000000400000-0x000000000041F000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4356	WINWORD.exe
3040	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-1-5-21-2654269261-3199571979-4291878722-1000\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	2026-06-02_8b440ded88cb5d9c4304e07cea00f412_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
5100	PING.EXE
2012	PING.EXE
5068	PING.EXE
2720	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
5100	PING.EXE
2012	PING.EXE
5068	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4108 wrote to memory of 4356	4108	2026-06-02_8b440ded88cb5d9c4304e07cea00f412_elex_wannacry.exe	83
PID 4356 wrote to memory of 2720	4356	WINWORD.exe	84
PID 2720 wrote to memory of 5100	2720	cmd.exe	86
PID 2720 wrote to memory of 2012	2720	cmd.exe	87
PID 2720 wrote to memory of 5068	2720	cmd.exe	88
PID 2720 wrote to memory of 3040	2720	cmd.exe	89

C:\Users\Admin\AppData\Local\Temp\2026-06-02_8b440ded88cb5d9c4304e07cea00f412_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-06-02_8b440ded88cb5d9c4304e07cea00f412_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4108
- 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:4356
- - 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\0000644B" 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:2720
  - - 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:5100
  - - 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:2012
  - - 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:5068
  - - 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:3040

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

0000644B

Path C:\Users\Admin\AppData\Roaming\Mozilla\0000644B
Size 57KB
SHA256 55dd7a2cd9698b1e72261c7656129a3f02d3af33466efbf37bd0dd12ac2e231d
MD5 873e833e4e7dd3de66eb170dbfba2cd0
SHA1 c3470a034c5a40a558a84a56629bc11ef89e1231
SHA512 1150ed2696380d012aee27aeae331867ed37b98dea73f02b1fbdd9a336826d355bfd6d085504f2891a0694be16850ff6de8a19ea20eae0115c80817e5df4162b
SSDEEP 1536:zcLsF2Kerc64sTiX2IV0DgsfrfWJF2+BD9Dmqal:wLy2Kerc64CiGImEsoDfal
TLSH
T1BF433913366414D1D8AB2138A4025E354BB8BDB21467F622B750BA1E1D779DACFA83CE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 57KB
SHA256 6e40ed2421f205ae79b8a8638bc58f8d92179dd94c3f7f2c38808156749837cc
MD5 8b440ded88cb5d9c4304e07cea00f412
SHA1 d11675418fefe809d5ee88cea32cd0ebe9257020
SHA512 ac563cd6056d14e003b920170aad02785627aae42308aa11199aaec01c4509adcf3915e3f7bc0ff4cdef6ebe728f97e64fb8da0087acd8ae01cabb461ee0911e
SSDEEP 1536:zcLsF2Kerc64sTiX2IV0DgsfrfWJF2+BD9DmqaN:wLy2Kerc64CiGImEsoDfaN
TLSH
T172433913366414D1D8BB2138A4025E354BB8BDB21467F622B750BA1E1D779DACFAC3CE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/3040-17-0x0000000000400000-0x000000000041F000-memory.dmp

Download

memory/3040-18-0x0000000000400000-0x000000000041F000-memory.dmp

Download

memory/4108-0-0x0000000000400000-0x000000000041F000-memory.dmp

Download

memory/4108-11-0x0000000000400000-0x000000000041F000-memory.dmp

Download

memory/4356-14-0x0000000000400000-0x000000000041F000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads