juko | 5c1c6ba6fae3182a3b76d9ba0c47d46c28bc9778a606b7525f0002905a8b3fd6

General

Target
2026-08-30_d5c1570e34e55912582ab12ae05b9979_elex_wannacry.exe
Size 64KB
Sample260831-d5hrpathkh
SHA256 5c1c6ba6fae3182a3b76d9ba0c47d46c28bc9778a606b7525f0002905a8b3fd6
MD5 d5c1570e34e55912582ab12ae05b9979
SHA1 8b96ba6fd4a41117b16c219704018b7e4a92dae8
SHA512 7448575e8663e043a93285cd52a4d3b386405dfd43b196987a573b6c40818f7dd7cc00e34036f72aeb2cfd89cc3b827a3685e5b72312fa5fc807d2966c69ebdb
SSDEEP 1536:t2LsF2Kerc64sTiX2IV0DOlOy6vlvqxy2dnNJfXlNWbITD9:t2Ly2Kerc64CiGImClOyqlvGdnNJfG8V
TLSH
T1925338173BE554C2E1E606706DB68F78847BFC704A23D51AB780720E1C75E62DE31BAA
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
behavioral1/files/0x000b000000024381-4.dat	family_juko
behavioral1/files/0x0009000000024595-12.dat	family_juko

Checks computer location settings 2 TTPs 2 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-2370214745-1838013427-2987045292-1000\Control Panel\International\Geo\Nation	2026-08-30_d5c1570e34e55912582ab12ae05b9979_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2370214745-1838013427-2987045292-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
2032	WINWORD.exe
2952	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-1-5-21-2370214745-1838013427-2987045292-1000\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
1908	cmd.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	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	2026-08-30_d5c1570e34e55912582ab12ae05b9979_elex_wannacry.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.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
1908	cmd.exe
4120	PING.EXE
4976	PING.EXE
2404	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4120	PING.EXE
4976	PING.EXE
2404	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4360 wrote to memory of 2032	4360	2026-08-30_d5c1570e34e55912582ab12ae05b9979_elex_wannacry.exe	85
PID 2032 wrote to memory of 1908	2032	WINWORD.exe	86
PID 1908 wrote to memory of 4120	1908	cmd.exe	88
PID 1908 wrote to memory of 4976	1908	cmd.exe	89
PID 1908 wrote to memory of 2404	1908	cmd.exe	92
PID 1908 wrote to memory of 2952	1908	cmd.exe	94

C:\Users\Admin\AppData\Local\Temp\2026-08-30_d5c1570e34e55912582ab12ae05b9979_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-30_d5c1570e34e55912582ab12ae05b9979_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4360
- C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
  "C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" -r
  2⤵
  - Checks computer location settings
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2032
- - 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\00004B95" 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:1908
  - - 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:4120
  - - 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:4976
  - - 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:2404
  - - 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:2952

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

Query Registry

1

T1012

Remote System Discovery

1

T1018

System Information Discovery

2

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

Replay Monitor

Loading Replay Monitor...

Downloads

00004B95

Path C:\Users\Admin\AppData\Roaming\Mozilla\00004B95
Size 64KB
SHA256 ce51ab2cb801929c5e0682a7df335b12cb04311f246dcbd924ee215fbdee6fed
MD5 1b1a3fff1b1791ed84da24e8a3890456
SHA1 34547e38aa31432562d32b98ae10ef4c7a902203
SHA512 c044a89953bab844e690cf5d22e64e7670972146eb0fc1a0fc6033a72c3a87048b5e58fcd0e458c84e5b2cf6d4d733e3bcfb7a92658866e75405b329fd67eff8
SSDEEP 1536:t2LsF2Kerc64sTiX2IV0DOlOy6vlvqxy2dnNJfXlNWbITDs:t2Ly2Kerc64CiGImClOyqlvGdnNJfG8U
TLSH
T1FE5338173BE554C2E1E606706DB68F78847BFC704A23D51AB780720E1C75E62DE31BAA
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 64KB
SHA256 5c1c6ba6fae3182a3b76d9ba0c47d46c28bc9778a606b7525f0002905a8b3fd6
MD5 d5c1570e34e55912582ab12ae05b9979
SHA1 8b96ba6fd4a41117b16c219704018b7e4a92dae8
SHA512 7448575e8663e043a93285cd52a4d3b386405dfd43b196987a573b6c40818f7dd7cc00e34036f72aeb2cfd89cc3b827a3685e5b72312fa5fc807d2966c69ebdb
SSDEEP 1536:t2LsF2Kerc64sTiX2IV0DOlOy6vlvqxy2dnNJfXlNWbITD9:t2Ly2Kerc64CiGImClOyqlvGdnNJfG8V
TLSH
T1925338173BE554C2E1E606706DB68F78847BFC704A23D51AB780720E1C75E62DE31BAA
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

Replay Monitor

Loading Replay Monitor...

Downloads