juko | f1f3e8486f0d58e3ef2de36f6ac50cc0cf1c94a08984567363623557fc6f306e

General

Target
2026-08-30_129f32dd9707ea39fa593b6fa0a53cc6_elex_wannacry.exe
Size 50KB
Sample260830-1gefpaswcx
SHA256 f1f3e8486f0d58e3ef2de36f6ac50cc0cf1c94a08984567363623557fc6f306e
MD5 129f32dd9707ea39fa593b6fa0a53cc6
SHA1 225deaf54344e96b582dad0979d0052bced6d9dd
SHA512 5412cad8b07079c7928eaed6d082f2b2795816760810fb1814cee304bd999077823b605bcb1be6393a92aad7cb82b5e3955ef6590b47c4a311c3eb162b5e9c8e
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqiNPWQHc8Sdq96AaWILOi:tLsF2Kerc64sTiX2IV0DpL8SE9nYOi
TLSH
T15D33291A3B41E1D1C4A351B0EC5B4F74983AEDB58E276103BB85B70D1CB2A52CF7298E
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/0x000a00000001b1c8-4.dat	family_juko
behavioral2/files/0x000f00000001c463-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4456	WINWORD.exe
3544	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-1-5-21-3986082593-3624157295-3514260330-1000\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
5568	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	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-08-30_129f32dd9707ea39fa593b6fa0a53cc6_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

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
5568	cmd.exe
932	PING.EXE
4560	PING.EXE
2568	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
932	PING.EXE
4560	PING.EXE
2568	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4932 wrote to memory of 4456	4932	2026-08-30_129f32dd9707ea39fa593b6fa0a53cc6_elex_wannacry.exe	89
PID 4456 wrote to memory of 5568	4456	WINWORD.exe	90
PID 5568 wrote to memory of 932	5568	cmd.exe	92
PID 5568 wrote to memory of 4560	5568	cmd.exe	93
PID 5568 wrote to memory of 2568	5568	cmd.exe	94
PID 5568 wrote to memory of 3544	5568	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-30_129f32dd9707ea39fa593b6fa0a53cc6_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-30_129f32dd9707ea39fa593b6fa0a53cc6_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4932
- 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:4456
- - 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\00000DAD" 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:5568
  - - 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:932
  - - 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:4560
  - - 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:2568
  - - 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:3544

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

00000DAD

Path C:\Users\Admin\AppData\Roaming\Mozilla\00000DAD
Size 50KB
SHA256 c1822416d641bcaa07c8a1d66e9b6874f71a722ec35cc299225c5fd53a26945b
MD5 69ed0250dd008452e9c21063f39142e9
SHA1 a85cf55a63a3cbace0814231ef1132ee3a325cf1
SHA512 f504797245f8d6801e1473b00a345b60a2a385f4ddbcd7efb23c1802fe9176e746822b253266eb22a535ed7835ad45f732bc49095964a28247382b5c9b8994ec
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqiNPWQHc8Sdq96AaWILOM:tLsF2Kerc64sTiX2IV0DpL8SE9nYOM
TLSH
T1AF33291A3B41E1D1C4A351B0EC5B4F74983AEDB58E276103BB85B70D1CB2A52CF3298E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 50KB
SHA256 f1f3e8486f0d58e3ef2de36f6ac50cc0cf1c94a08984567363623557fc6f306e
MD5 129f32dd9707ea39fa593b6fa0a53cc6
SHA1 225deaf54344e96b582dad0979d0052bced6d9dd
SHA512 5412cad8b07079c7928eaed6d082f2b2795816760810fb1814cee304bd999077823b605bcb1be6393a92aad7cb82b5e3955ef6590b47c4a311c3eb162b5e9c8e
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqiNPWQHc8Sdq96AaWILOi:tLsF2Kerc64sTiX2IV0DpL8SE9nYOi
TLSH
T15D33291A3B41E1D1C4A351B0EC5B4F74983AEDB58E276103BB85B70D1CB2A52CF7298E
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