juko | f6e8875c408df71cf5706071763acfbda70dd683d94104ad17c6b14fa85eda8c

General

Target
2026-10-10_435c1fe35c4a1ebceb627637b9a02cba_elex_wannacry.exe
Size 37KB
Sample261011-s8mmdatvfs
SHA256 f6e8875c408df71cf5706071763acfbda70dd683d94104ad17c6b14fa85eda8c
MD5 435c1fe35c4a1ebceb627637b9a02cba
SHA1 d5ef45117b2789d1a5b4a529dd2085ea4aa750e3
SHA512 2aa42a3b551dd4f31d14d3f04ccee0758beb7af49cc0c0a4f0fe47135d4f31b1a2e8f26e747b3e287584ea188efd9f4acf666ee101f30000b23df57591541e2e
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqyNPWQHehiod1aVN9bSOOl5:3LsF2Kerc64sTiX2IV0D5tcz9+OOb
TLSH
T13703491B69A46042C1A312B0FD991F35C57E9DB814E7B052A744BA5C2CB2E63DF70ECE
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/0x000c000000019cb7-3.dat	family_juko
behavioral2/files/0x000f00000001c45d-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
3696	WINWORD.exe
3632	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-1-5-21-461973139-3212354679-1508698038-1000\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
940	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	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	2026-10-10_435c1fe35c4a1ebceb627637b9a02cba_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
940	cmd.exe
8	PING.EXE
4608	PING.EXE
2024	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
8	PING.EXE
4608	PING.EXE
2024	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5988 wrote to memory of 3696	5988	2026-10-10_435c1fe35c4a1ebceb627637b9a02cba_elex_wannacry.exe	89
PID 3696 wrote to memory of 940	3696	WINWORD.exe	90
PID 940 wrote to memory of 8	940	cmd.exe	92
PID 940 wrote to memory of 4608	940	cmd.exe	93
PID 940 wrote to memory of 2024	940	cmd.exe	94
PID 940 wrote to memory of 3632	940	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-10-10_435c1fe35c4a1ebceb627637b9a02cba_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-10-10_435c1fe35c4a1ebceb627637b9a02cba_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5988
- 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:3696
- - 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\000077CB" 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:940
  - - 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:8
  - - 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:\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:2024
  - - 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:3632

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

Replay Monitor

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Downloads

000077CB

Path C:\Users\Admin\AppData\Roaming\Mozilla\000077CB
Size 37KB
SHA256 30fe6ffff49586b2efd5281ed3d9e36f23fbe224faa48a799a5a77c2be3d78e8
MD5 9aea591a6ebce85ed14200927ef8fcee
SHA1 5dd9845732d6b8fc4443dc927ba20770ba6c8cff
SHA512 4c88f96267e7b3f4a39466b8675cba94685ded9865c66cd7d4fb9306e90767b38d1ded591975e51a9b10ebd9cf95d878291f924b096da5dc5c7631f2c4b9d570
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqyNPWQHehiod1aVN9bSOOlU:3LsF2Kerc64sTiX2IV0D5tcz9+OOy
TLSH
T1C803491B69A46042C1A312B0FD991F35857E9DB814E7B052A744BA5C2CB2E63DF70ECE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 37KB
SHA256 f6e8875c408df71cf5706071763acfbda70dd683d94104ad17c6b14fa85eda8c
MD5 435c1fe35c4a1ebceb627637b9a02cba
SHA1 d5ef45117b2789d1a5b4a529dd2085ea4aa750e3
SHA512 2aa42a3b551dd4f31d14d3f04ccee0758beb7af49cc0c0a4f0fe47135d4f31b1a2e8f26e747b3e287584ea188efd9f4acf666ee101f30000b23df57591541e2e
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqyNPWQHehiod1aVN9bSOOl5:3LsF2Kerc64sTiX2IV0D5tcz9+OOb
TLSH
T13703491B69A46042C1A312B0FD991F35C57E9DB814E7B052A744BA5C2CB2E63DF70ECE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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