juko | 55e4ae2b51530880856aa0edf1d5850bf61d277ca58d80b3a47da2a34307ffe9

General

Target
2026-10-07_ff6d939be03ceb39dd79511e56a474aa_elex_wannacry.exe
Size 47KB
Sample261007-3rmadsxvgw
SHA256 55e4ae2b51530880856aa0edf1d5850bf61d277ca58d80b3a47da2a34307ffe9
MD5 ff6d939be03ceb39dd79511e56a474aa
SHA1 4994a790954074a3e0c12d4d544bbc72dd7ef372
SHA512 704064fb3a9f149a0dc54fb9ed66d384a544f4644694d4bba793103df514e085a68e3a7d449790450ba5390c8cf416d16109875d2e6de5434487bbf85366da42
SSDEEP 768:tyZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqZNPWQHmgyFIvA0vqxet2dMINJi:t2LsF2Kerc64sTiX2IV0DOlgy6vlvqx0
TLSH
T1B5235B173EA520C1D6D610B0EAA90F78843DEDB50127A152F780B65D2CB6E62DF71ECE
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/0x000a0000000004ea-3.dat	family_juko
behavioral1/files/0x000600000001da69-12.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-1-5-21-524788801-3318743092-4051225893-1000\Control Panel\International\Geo\Nation	2026-10-07_ff6d939be03ceb39dd79511e56a474aa_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-524788801-3318743092-4051225893-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
392	WINWORD.exe
1444	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-1-5-21-524788801-3318743092-4051225893-1000\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
1884	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	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-10-07_ff6d939be03ceb39dd79511e56a474aa_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

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
1884	cmd.exe
1988	PING.EXE
5080	PING.EXE
4988	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
1988	PING.EXE
5080	PING.EXE
4988	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2128 wrote to memory of 392	2128	2026-10-07_ff6d939be03ceb39dd79511e56a474aa_elex_wannacry.exe	90
PID 392 wrote to memory of 1884	392	WINWORD.exe	91
PID 1884 wrote to memory of 1988	1884	cmd.exe	93
PID 1884 wrote to memory of 5080	1884	cmd.exe	96
PID 1884 wrote to memory of 4988	1884	cmd.exe	99
PID 1884 wrote to memory of 1444	1884	cmd.exe	100

C:\Users\Admin\AppData\Local\Temp\2026-10-07_ff6d939be03ceb39dd79511e56a474aa_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-10-07_ff6d939be03ceb39dd79511e56a474aa_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2128
- 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:392
- - 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\00001242" 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:1884
  - - 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:1988
  - - 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:5080
  - - 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:4988
  - - 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:1444

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

2

T1016

Internet Connection Discovery

1

T1016.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

00001242

Path C:\Users\Admin\AppData\Roaming\Mozilla\00001242
Size 47KB
SHA256 a5f45a5fd58672f8277509b1cee0a0dac251503c4ac9eaa68d270f0b2affe206
MD5 982e538aaab2eee4eca888ff7701a21f
SHA1 b7c954c6e0ab244a66193ef0ebe3258eb3de3e0d
SHA512 0f63462a446545e972bac5a8cd6df1683dfd34e189f56a8ca40a8628fa2d0acab144ec298dc4ef0af3a78c347fcf694bbac044bdbae0d0b73cad8451c9439a66
SSDEEP 768:tyZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqZNPWQHmgyFIvA0vqxet2dMINJh:t2LsF2Kerc64sTiX2IV0DOlgy6vlvqxf
TLSH
T1E0235B173EA520C1D6D610B0EAA90F78843DEDB50127A152F780B65D2CB6E62DF71ECE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 47KB
SHA256 55e4ae2b51530880856aa0edf1d5850bf61d277ca58d80b3a47da2a34307ffe9
MD5 ff6d939be03ceb39dd79511e56a474aa
SHA1 4994a790954074a3e0c12d4d544bbc72dd7ef372
SHA512 704064fb3a9f149a0dc54fb9ed66d384a544f4644694d4bba793103df514e085a68e3a7d449790450ba5390c8cf416d16109875d2e6de5434487bbf85366da42
SSDEEP 768:tyZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqZNPWQHmgyFIvA0vqxet2dMINJi:t2LsF2Kerc64sTiX2IV0DOlgy6vlvqx0
TLSH
T1B5235B173EA520C1D6D610B0EAA90F78843DEDB50127A152F780B65D2CB6E62DF71ECE
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