juko | 9ca2f800d52a4fbbf3bb1ed9569aecdf77eb30f83c2e2f03f9b4696d815bb2b4

General

Target
2026-10-22_a4a870f9cf72f41c7b61e42d5f910f87_elex_wannacry.exe
Size 64KB
Sample261024-cga69se181
SHA256 9ca2f800d52a4fbbf3bb1ed9569aecdf77eb30f83c2e2f03f9b4696d815bb2b4
MD5 a4a870f9cf72f41c7b61e42d5f910f87
SHA1 5c5de60d3c656d58af72aeefe1aad7feb7aa28ba
SHA512 43a43dc5627a99bc8489263641bcf91c863e17265e98e8805cb88dfd8bc95bd520677003e5a1d919fff4d23801b45c33a44274a79761974139315c7dfc953eac
SSDEEP 1536:t2LsF2Kerc64sTiX2IV0DOlOy6vlvqxy2dnNJfXlNWbITD7:t2Ly2Kerc64CiGImClOyqlvGdnNJfG8T
TLSH
T15D5338173BE554C2E1E606706DB68F78847BFC700A23D51AB780720E1C75E62DE31BAA
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/0x001000000001b85b-3.dat	family_juko
behavioral2/files/0x000e00000001c597-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
3936	WINWORD.exe
3200	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-1-5-21-560646293-820748483-2532804640-1000\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
3192	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	2026-10-22_a4a870f9cf72f41c7b61e42d5f910f87_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
3192	cmd.exe
4700	PING.EXE
5016	PING.EXE
4608	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
5016	PING.EXE
4608	PING.EXE
4700	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1276 wrote to memory of 3936	1276	2026-10-22_a4a870f9cf72f41c7b61e42d5f910f87_elex_wannacry.exe	89
PID 3936 wrote to memory of 3192	3936	WINWORD.exe	90
PID 3192 wrote to memory of 4700	3192	cmd.exe	92
PID 3192 wrote to memory of 5016	3192	cmd.exe	93
PID 3192 wrote to memory of 4608	3192	cmd.exe	94
PID 3192 wrote to memory of 3200	3192	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-10-22_a4a870f9cf72f41c7b61e42d5f910f87_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-10-22_a4a870f9cf72f41c7b61e42d5f910f87_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1276
- 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:3936
- - 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\00006F88" 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:3192
  - - 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:4700
  - - 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:5016
  - - 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:4608
  - - 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:3200

C:\Windows\system32\svchost.exe
C:\Windows\system32\svchost.exe -k GPSvcGroup
1⤵
PID:3776

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

00006F88

Path C:\Users\Admin\AppData\Roaming\Mozilla\00006F88
Size 64KB
SHA256 742dab06f56028840953ac759b5842e7b2178ec2860849db5d3d12f116202919
MD5 955dec02700dd5855c6108d73bd51aa6
SHA1 7e2d280dbe1112b53525a92df8661671d293960e
SHA512 d47cbd3df888dc5884981b66c5d0b9b695fe18f59b2ba3545cc75ab08829c567e88981743a4fd6c2d9bd547967ea86cde52882bc3573bab41a27db96b606a234
SSDEEP 1536:t2LsF2Kerc64sTiX2IV0DOlOy6vlvqxy2dnNJfXlNWbITDj:t2Ly2Kerc64CiGImClOyqlvGdnNJfG8b
TLSH
T11D5339173BE554C2E1E606706DB68F78847BFC704A23D51AB780720E1C75E62DE31BAA
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 64KB
SHA256 9ca2f800d52a4fbbf3bb1ed9569aecdf77eb30f83c2e2f03f9b4696d815bb2b4
MD5 a4a870f9cf72f41c7b61e42d5f910f87
SHA1 5c5de60d3c656d58af72aeefe1aad7feb7aa28ba
SHA512 43a43dc5627a99bc8489263641bcf91c863e17265e98e8805cb88dfd8bc95bd520677003e5a1d919fff4d23801b45c33a44274a79761974139315c7dfc953eac
SSDEEP 1536:t2LsF2Kerc64sTiX2IV0DOlOy6vlvqxy2dnNJfXlNWbITD7:t2Ly2Kerc64CiGImClOyqlvGdnNJfG8T
TLSH
T15D5338173BE554C2E1E606706DB68F78847BFC700A23D51AB780720E1C75E62DE31BAA
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads