juko | 76562a3bd8fa3bf8cc00027b8fe6aca283687a5493784d991995262eec42cdf3

General

Target
2026-10-26_e5d8fa43d835cf775d8564a8a3482a04_elex_wannacry.exe
Size 67KB
Sample261027-embfbs1vfy
SHA256 76562a3bd8fa3bf8cc00027b8fe6aca283687a5493784d991995262eec42cdf3
MD5 e5d8fa43d835cf775d8564a8a3482a04
SHA1 879393bf144f92c836992c83a171705129027090
SHA512 fb40e9d253ebd8567c668182594c4d16dbc90a5d54a38b7c82b9b343fef4b96c4f222e592e1ae73aa070815713ceff442431d018cad3494220836f1f5ef62696
SSDEEP 1536:aLsF2Kerc64sTiX2IV0DVyIGFoyyCwlAY0VdTQN:aLy2Kerc64CiGImRylFyp8Ti
TLSH
T1BD633B16B950B032D99211B46A6D6B36817A9DF10707A0D3F7407ADD28F2BD2EF346CE
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/5108-0-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x000b000000019cb3-4.dat	family_juko
behavioral2/memory/5108-10-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/1096-12-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x000f00000001c537-13.dat	family_juko
behavioral2/memory/6124-16-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
1096	WINWORD.exe
6124	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-1-5-21-53044966-3830981193-2402648431-1000\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
4960	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\Hostname	WINWORD.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Domain	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	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-10-26_e5d8fa43d835cf775d8564a8a3482a04_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
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
4372	PING.EXE
4368	PING.EXE
4432	PING.EXE
4960	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4372	PING.EXE
4368	PING.EXE
4432	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5108 wrote to memory of 1096	5108	2026-10-26_e5d8fa43d835cf775d8564a8a3482a04_elex_wannacry.exe	89
PID 1096 wrote to memory of 4960	1096	WINWORD.exe	90
PID 4960 wrote to memory of 4372	4960	cmd.exe	92
PID 4960 wrote to memory of 4368	4960	cmd.exe	93
PID 4960 wrote to memory of 4432	4960	cmd.exe	94
PID 4960 wrote to memory of 6124	4960	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-10-26_e5d8fa43d835cf775d8564a8a3482a04_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-10-26_e5d8fa43d835cf775d8564a8a3482a04_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5108
- 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:1096
- - 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\000062BE" 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:4960
  - - 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:4372
  - - 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:4368
  - - 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:4432
  - - 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:6124

C:\Windows\system32\svchost.exe
C:\Windows\system32\svchost.exe -k GPSvcGroup
1⤵
PID:3128

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

000062BE

Path C:\Users\Admin\AppData\Roaming\Mozilla\000062BE
Size 67KB
SHA256 858943690a9c9d8079b60bec62ece844151ed50031719326ec556cd79c9e4630
MD5 39b610de523ec8c332eb35ea1fe4077c
SHA1 a638c7f6d722f3e144266f9b1b71335ce1c26542
SHA512 a1ec2b41a02d0ce8019596a91f1aeb0f0026dd609036fd44bc1c7cd4d0e918724275b524d2e5d37d5966a19839a9394b5c4bd78423738e51d491a370560277f9
SSDEEP 1536:aLsF2Kerc64sTiX2IV0DVyIGFoyyCwlAY0VdTQx:aLy2Kerc64CiGImRylFyp8T+
TLSH
T126633B16B950B032D99211B46A6D6B36817A9DF10707A0D3F7407ADD28F2BD2EF346CE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 67KB
SHA256 76562a3bd8fa3bf8cc00027b8fe6aca283687a5493784d991995262eec42cdf3
MD5 e5d8fa43d835cf775d8564a8a3482a04
SHA1 879393bf144f92c836992c83a171705129027090
SHA512 fb40e9d253ebd8567c668182594c4d16dbc90a5d54a38b7c82b9b343fef4b96c4f222e592e1ae73aa070815713ceff442431d018cad3494220836f1f5ef62696
SSDEEP 1536:aLsF2Kerc64sTiX2IV0DVyIGFoyyCwlAY0VdTQN:aLy2Kerc64CiGImRylFyp8Ti
TLSH
T1BD633B16B950B032D99211B46A6D6B36817A9DF10707A0D3F7407ADD28F2BD2EF346CE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1096-12-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/5108-0-0x0000000000400000-0x000000000041D000-memory.dmp

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memory/5108-10-0x0000000000400000-0x000000000041D000-memory.dmp

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memory/6124-16-0x0000000000400000-0x000000000041D000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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