juko | 647dff17fc3a9ad054fa60667905c20a3ff2287b9e787b5d1a5b12ba2f8e078e

General

Target
2026-10-14_bd17c6f05e505a9dc5d87a0123ae7dce_elex_wannacry.exe
Size 64KB
Sample261014-qemdeadt2p
SHA256 647dff17fc3a9ad054fa60667905c20a3ff2287b9e787b5d1a5b12ba2f8e078e
MD5 bd17c6f05e505a9dc5d87a0123ae7dce
SHA1 e31c2ec293e762a70aa9f64f45521fa13b2ceaa7
SHA512 eb1e362e89513a408437ce085221983c5c06e4d824b9f26e2a1965d9ccb11fbac9182d44c482f5767ed99bab8ba35bdc2a8d208312359d15247be302c4c8b05b
SSDEEP 1536:t2LsF2Kerc64sTiX2IV0DOlOy6vlvqxy2dnNJfXlNWbITDQ:t2Ly2Kerc64CiGImClOyqlvGdnNJfG8Y
TLSH
T1335338173BE554C2E1E606706DB68F78847BFC704A23D51AB780720E1C75E62DE31BAA
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 2 IoCs

resource	yara_rule
behavioral2/files/0x000c00000001b87a-3.dat	family_juko
behavioral2/files/0x000d00000001c5ca-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
724	WINWORD.exe
2544	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-1-5-21-4280978039-528710165-233981602-1000\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
2852	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	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	2026-10-14_bd17c6f05e505a9dc5d87a0123ae7dce_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

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
2852	cmd.exe
5380	PING.EXE
4888	PING.EXE
3176	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
5380	PING.EXE
4888	PING.EXE
3176	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4404 wrote to memory of 724	4404	2026-10-14_bd17c6f05e505a9dc5d87a0123ae7dce_elex_wannacry.exe	89
PID 724 wrote to memory of 2852	724	WINWORD.exe	90
PID 2852 wrote to memory of 5380	2852	cmd.exe	92
PID 2852 wrote to memory of 4888	2852	cmd.exe	93
PID 2852 wrote to memory of 3176	2852	cmd.exe	94
PID 2852 wrote to memory of 2544	2852	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-10-14_bd17c6f05e505a9dc5d87a0123ae7dce_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-10-14_bd17c6f05e505a9dc5d87a0123ae7dce_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4404
- 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:724
- - 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\0000715F" 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:2852
  - - 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:5380
  - - 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:4888
  - - 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:3176
  - - 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:2544

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

0000715F

Path C:\Users\Admin\AppData\Roaming\Mozilla\0000715F
Size 64KB
SHA256 d9f95eb0bca7153c19f0d6010a0fcb563ae36b1ff6826b3d1131d11760f5b2c3
MD5 bc3ffe5b34f75f4977091bb282b73067
SHA1 eedc25343133cb5890f8fc3d3177ea42b3854bd6
SHA512 68f58f15f699256ac815031d6940ca016ab970be244dc074c226b189e03fa827e9f70d26529df542f67b66f06e27ae0a5cd9cba8f8e09b8e571c64c0c6e56e15
SSDEEP 1536:t2LsF2Kerc64sTiX2IV0DOlOy6vlvqxy2dnNJfXlNWbITDK:t2Ly2Kerc64CiGImClOyqlvGdnNJfG8S
TLSH
T16E5338173BE554C2E1E606706DB68F78847BFC704A23D51AB780720E1C75E62DE31BAA
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 64KB
SHA256 647dff17fc3a9ad054fa60667905c20a3ff2287b9e787b5d1a5b12ba2f8e078e
MD5 bd17c6f05e505a9dc5d87a0123ae7dce
SHA1 e31c2ec293e762a70aa9f64f45521fa13b2ceaa7
SHA512 eb1e362e89513a408437ce085221983c5c06e4d824b9f26e2a1965d9ccb11fbac9182d44c482f5767ed99bab8ba35bdc2a8d208312359d15247be302c4c8b05b
SSDEEP 1536:t2LsF2Kerc64sTiX2IV0DOlOy6vlvqxy2dnNJfXlNWbITDQ:t2Ly2Kerc64CiGImClOyqlvGdnNJfG8Y
TLSH
T1335338173BE554C2E1E606706DB68F78847BFC704A23D51AB780720E1C75E62DE31BAA
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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