juko | 477daa884707499cb4b90b0222a87d676f991e8fcd4ef9607720fc975584ce7c

General

Target
2026-08-05_6fa61680d685b01e786976b06977920e_elex_wannacry.exe
Size 56KB
Sample260806-ahsftsyglc
SHA256 477daa884707499cb4b90b0222a87d676f991e8fcd4ef9607720fc975584ce7c
MD5 6fa61680d685b01e786976b06977920e
SHA1 ff1a29d8815d67af3f77dea171825734ac8baf5e
SHA512 c6044079ae6c0009f41fa78c1bad8fda14503d2f9d6421f6fd0cf070b74d493b6d5ee731dbae0e1f9383cba784062eaa6f2f988f8a8bc5e43a07527da8890f4a
SSDEEP 1536:PLsF2Kerc64sTiX2IV0DeRa8OKFVG9WGWt:PLy2Kerc64CiGImqRa8OKFE9WBt
TLSH
T1A34319277AE55CD2C15360F0EAE49B308038FD7219279023E794BB9816BEC92DF7169D
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 7 IoCs

resource	yara_rule
behavioral2/memory/1188-0-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/files/0x0010000000016cb6-5.dat	family_juko
behavioral2/memory/1188-10-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/memory/5516-12-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/files/0x000c00000001c63b-13.dat	family_juko
behavioral2/memory/4912-15-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/memory/4912-16-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
5516	WINWORD.exe
4912	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-1-5-21-1014449518-1831897916-4205727055-1000\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
2940	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	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	2026-08-05_6fa61680d685b01e786976b06977920e_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
2452	PING.EXE
3224	PING.EXE
4760	PING.EXE
2940	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4760	PING.EXE
2452	PING.EXE
3224	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1188 wrote to memory of 5516	1188	2026-08-05_6fa61680d685b01e786976b06977920e_elex_wannacry.exe	90
PID 5516 wrote to memory of 2940	5516	WINWORD.exe	91
PID 2940 wrote to memory of 2452	2940	cmd.exe	93
PID 2940 wrote to memory of 3224	2940	cmd.exe	94
PID 2940 wrote to memory of 4760	2940	cmd.exe	95
PID 2940 wrote to memory of 4912	2940	cmd.exe	96

C:\Users\Admin\AppData\Local\Temp\2026-08-05_6fa61680d685b01e786976b06977920e_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-05_6fa61680d685b01e786976b06977920e_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1188
- 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:5516
- - 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\00001DC5" 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:2940
  - - 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:2452
  - - 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:3224
  - - 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:4760
  - - 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:4912

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

1

T1016

Internet Connection Discovery

1

T1016.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

00001DC5

Path C:\Users\Admin\AppData\Roaming\Mozilla\00001DC5
Size 56KB
SHA256 1d5bcb0a28e5b6a5d3b6b5b268c2f9712ed35db6088c36bd69ff12a379b6e3ae
MD5 2790dd4335484a35b3a5503f3a27e163
SHA1 5dc3175f8e2a98e54bddcc562e364b218f5913eb
SHA512 685dcd85f1746c0b599169d7ae2e638494138c8c127673b126787efaa0268e6c8070a107f09d2145204d422941bc7c0b6daa21fcccc349b3aa70852aa2e078de
SSDEEP 1536:PLsF2Kerc64sTiX2IV0DeRa8OKFVG9WGWE:PLy2Kerc64CiGImqRa8OKFE9WBE
TLSH
T1F54319277AE55CD2C15360F0EAE49B308038FD7219279023E794BB9816BEC92DF7169D
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 56KB
SHA256 477daa884707499cb4b90b0222a87d676f991e8fcd4ef9607720fc975584ce7c
MD5 6fa61680d685b01e786976b06977920e
SHA1 ff1a29d8815d67af3f77dea171825734ac8baf5e
SHA512 c6044079ae6c0009f41fa78c1bad8fda14503d2f9d6421f6fd0cf070b74d493b6d5ee731dbae0e1f9383cba784062eaa6f2f988f8a8bc5e43a07527da8890f4a
SSDEEP 1536:PLsF2Kerc64sTiX2IV0DeRa8OKFVG9WGWt:PLy2Kerc64CiGImqRa8OKFE9WBt
TLSH
T1A34319277AE55CD2C15360F0EAE49B308038FD7219279023E794BB9816BEC92DF7169D
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1188-0-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/1188-10-0x0000000000400000-0x0000000000422000-memory.dmp

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memory/4912-15-0x0000000000400000-0x0000000000422000-memory.dmp

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memory/4912-16-0x0000000000400000-0x0000000000422000-memory.dmp

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memory/5516-12-0x0000000000400000-0x0000000000422000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads