juko | 4b7d5351fc6d35c006eb7255c0160e00d6dd34fc35eb5457f140c8be5efbb421

General

Target
2026-09-23_225dcc544c97322a8fc508b157ea5821_elex_wannacry.exe
Size 42KB
Sample260924-psr1datfle
SHA256 4b7d5351fc6d35c006eb7255c0160e00d6dd34fc35eb5457f140c8be5efbb421
MD5 225dcc544c97322a8fc508b157ea5821
SHA1 eaf39809c482580d86b4d3a312a1bf2fa86f0635
SHA512 535ea0bf6ed3cacb1bf17999df1969b182b621900a10aac3ad609f9d519450c23c321a263bd448930a423246b16affa63d24719d51cca8e0bd873c7b811bd69a
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqyNPWQHehiod1aVN9KfQHftESOOlN:3LsF2Kerc64sTiX2IV0D5tcz9Kf8pOO3
TLSH
T16A134A2A6994A052C1A312B0FC9D5F35853D9DB814E7B047B344BA5D2CB2E63DF70E8E
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/0x0015000000016a78-4.dat	family_juko
behavioral2/files/0x001500000001c537-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
620	WINWORD.exe
2012	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-1-5-21-2714045687-1127350534-2056456672-1000\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
4608	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	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-09-23_225dcc544c97322a8fc508b157ea5821_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
4608	cmd.exe
1940	PING.EXE
2732	PING.EXE
4984	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
1940	PING.EXE
2732	PING.EXE
4984	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2864 wrote to memory of 620	2864	2026-09-23_225dcc544c97322a8fc508b157ea5821_elex_wannacry.exe	91
PID 620 wrote to memory of 4608	620	WINWORD.exe	92
PID 4608 wrote to memory of 1940	4608	cmd.exe	94
PID 4608 wrote to memory of 2732	4608	cmd.exe	95
PID 4608 wrote to memory of 4984	4608	cmd.exe	96
PID 4608 wrote to memory of 2012	4608	cmd.exe	97

C:\Users\Admin\AppData\Local\Temp\2026-09-23_225dcc544c97322a8fc508b157ea5821_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-09-23_225dcc544c97322a8fc508b157ea5821_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2864
- 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:620
- - 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\00004831" 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: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:1940
  - - 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:2732
  - - 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:4984
  - - 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:2012

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

00004831

Path C:\Users\Admin\AppData\Roaming\Mozilla\00004831
Size 42KB
SHA256 56caa2484740e38ff3f4aa8ebf6230136c46918c7a22d8caf2282f66a5ccde08
MD5 f80eb2d11bed34c6ea7bd0a68e3c2a9a
SHA1 285f997ec9aff76854d736287b87056975b6e4ec
SHA512 0fc53e4f3da01549cc914be4665ef67a7dac7fff7e1700effb26b98c6b8a95b056e38257bc04251c46f5ff5bad9ccaeaba4131c048fca4bf6ed9be2ea59e3dc1
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqyNPWQHehiod1aVN9KfQHftESOOlg:3LsF2Kerc64sTiX2IV0D5tcz9Kf8pOOG
TLSH
T1B6134A2A6994A052C1A312B0FC9D5F35853D9DB814E7B047B344BA5D2CB2E63DF70E8E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 42KB
SHA256 4b7d5351fc6d35c006eb7255c0160e00d6dd34fc35eb5457f140c8be5efbb421
MD5 225dcc544c97322a8fc508b157ea5821
SHA1 eaf39809c482580d86b4d3a312a1bf2fa86f0635
SHA512 535ea0bf6ed3cacb1bf17999df1969b182b621900a10aac3ad609f9d519450c23c321a263bd448930a423246b16affa63d24719d51cca8e0bd873c7b811bd69a
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqyNPWQHehiod1aVN9KfQHftESOOlN:3LsF2Kerc64sTiX2IV0D5tcz9Kf8pOO3
TLSH
T16A134A2A6994A052C1A312B0FC9D5F35853D9DB814E7B047B344BA5D2CB2E63DF70E8E
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