juko | 413b4a4d48202e89ee963c61d803aecc4384099837fd2934967d20ad9f14da00

General

Target
2026-11-01_b86d9c874d03eca945a5b4f447c8882f_elex_wannacry.exe
Size 67KB
Sample261102-mshetsgz4y
SHA256 413b4a4d48202e89ee963c61d803aecc4384099837fd2934967d20ad9f14da00
MD5 b86d9c874d03eca945a5b4f447c8882f
SHA1 806eff8e9b90031ade65d2d6aba44610be5c2535
SHA512 ab83094456420d3482a2d8b095313fb1b1a95406953e0bfc79ced7f8a1a14e5d2b4a0be40598710645274263683c5f3f20938bdafbc0adeb67703011b4d577d1
SSDEEP 1536:4LsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2J4p4kojVR6h2r:4Ly2Kerc64CiGImVu8p4kojWh2Op4kod
TLSH
T1D7634C4A7BDA50C2D57205B4EDE60A75933FEC2A25138B1ED750354B1C7286BCF20EAE
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

discovery execution juko persistence trojan

Malware Config

Signatures

Family: Juko
Juko is a trojan written in C++.
trojan juko

Detects Juko 6 IoCs

resource	yara_rule
behavioral2/memory/4748-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x001000000001b871-4.dat	family_juko
behavioral2/memory/4748-10-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/3432-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x0005000000000433-13.dat	family_juko
behavioral2/memory/844-16-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
3432	WINWORD.exe
844	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-1-5-21-1704430598-3087477806-3297458608-1000\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

Executes a command shell one-liner 1 TTPs 1 IoCs

Execution of a cmd.exe one-liner (/c "close" or /k "keep") is a common script/loader stage.

execution

Windows Command Shell

T1059.003

pid	Process
2708	cmd.exe

Reads the TCP/IP host and domain name from the registry 1 TTPs 2 IoCs

The configured hostname and DNS domain identify the machine and are commonly collected to profile a host before it reports in.

discovery

System Network Configuration Discovery

T1016

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Domain	WINWORD.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Hostname	WINWORD.exe

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	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-11-01_b86d9c874d03eca945a5b4f447c8882f_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
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
2708	cmd.exe
6116	PING.EXE
5496	PING.EXE
5956	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
6116	PING.EXE
5496	PING.EXE
5956	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4748 wrote to memory of 3432	4748	2026-11-01_b86d9c874d03eca945a5b4f447c8882f_elex_wannacry.exe	89
PID 3432 wrote to memory of 2708	3432	WINWORD.exe	90
PID 2708 wrote to memory of 6116	2708	cmd.exe	92
PID 2708 wrote to memory of 5496	2708	cmd.exe	93
PID 2708 wrote to memory of 5956	2708	cmd.exe	94
PID 2708 wrote to memory of 844	2708	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-11-01_b86d9c874d03eca945a5b4f447c8882f_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-11-01_b86d9c874d03eca945a5b4f447c8882f_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4748
- 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:3432
- - 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\00002A38" WINWORD.exe&ping 127.0.0.1 -n 2&"C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" \r
    3⤵
    - Executes a command shell one-liner
    - System Location Discovery: System Language Discovery
    - System Network Configuration Discovery: Internet Connection Discovery
    - Suspicious use of WriteProcessMemory
    PID:2708
  - - 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:6116
  - - 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:5496
  - - 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:5956
  - - 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
      Reads the TCP/IP host and domain name from the registry
      System Location Discovery: System Language Discovery
      PID:844

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

Windows Command Shell

1

T1059.003

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

2

T1016

Internet Connection Discovery

1

T1016.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

00002A38

Path C:\Users\Admin\AppData\Roaming\Mozilla\00002A38
Size 67KB
SHA256 59b229334088a5b634e970087acb0a70de1d81508e4046787b4f1875ac79f976
MD5 5414d28949f1c44a64240177f0dafb0e
SHA1 d7131da83e8aeae7290ef541555ada3a822f76f5
SHA512 e637cdc2d8cd28338c31ef2d0785761457cd1de41195379c72307665caa0523de2544a548606f5c425a4bde84392c58b252abc70b49f28c314d2659cf3ca6940
SSDEEP 1536:4LsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2J4p4kojVR6h2q:4Ly2Kerc64CiGImVu8p4kojWh2Op4ko0
TLSH
T149634C4A7BDA50C2D57205B4EDE60A75933FEC2A25138B1ED750354B1C7286BCF20EAE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 67KB
SHA256 413b4a4d48202e89ee963c61d803aecc4384099837fd2934967d20ad9f14da00
MD5 b86d9c874d03eca945a5b4f447c8882f
SHA1 806eff8e9b90031ade65d2d6aba44610be5c2535
SHA512 ab83094456420d3482a2d8b095313fb1b1a95406953e0bfc79ced7f8a1a14e5d2b4a0be40598710645274263683c5f3f20938bdafbc0adeb67703011b4d577d1
SSDEEP 1536:4LsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2J4p4kojVR6h2r:4Ly2Kerc64CiGImVu8p4kojWh2Op4kod
TLSH
T1D7634C4A7BDA50C2D57205B4EDE60A75933FEC2A25138B1ED750354B1C7286BCF20EAE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/844-16-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/3432-12-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4748-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4748-10-0x0000000000400000-0x0000000000420000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads