juko | 396176a16fe8504bac4a8651180b91f1cfc5c6423400de8df6d1cf7ebbcc725b

General

Target
2026-08-02_a0559c4e35fcbd2ed1e471878a35d329_elex_wannacry.exe
Size 37KB
Sample260802-1aa5pasbng
SHA256 396176a16fe8504bac4a8651180b91f1cfc5c6423400de8df6d1cf7ebbcc725b
MD5 a0559c4e35fcbd2ed1e471878a35d329
SHA1 a1c436caa607599c50aa7a3658b199e4bbad04f5
SHA512 72d58a26874157277e875109c94b4fc4e9c1241392d94cd3ec645c321b3ea2728921df7c1d37e1aa80ab422ed4f7cdf60b4f0976a30c198bcf6d7539c1c7f00b
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpZa5ywaO:3LsF2Kerc64sTiX2IV0Dhuogwh
TLSH
T180035C1A299160A2D55310B0E9D82FB4C53D8C76106BB066F740BE59A8B3CD7DF72BCE
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
behavioral1/memory/1864-0-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/files/0x00150000000242b2-5.dat	family_juko
behavioral1/memory/1864-12-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/memory/3020-14-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/files/0x000800000002446a-15.dat	family_juko
behavioral1/memory/3148-17-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/memory/3148-18-0x0000000000400000-0x000000000041D000-memory.dmp	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-1-5-21-876885714-46325919-1482798410-1000\Control Panel\International\Geo\Nation	2026-08-02_a0559c4e35fcbd2ed1e471878a35d329_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-876885714-46325919-1482798410-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
3020	WINWORD.exe
3148	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-1-5-21-876885714-46325919-1482798410-1000\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
672	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	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	2026-08-02_a0559c4e35fcbd2ed1e471878a35d329_elex_wannacry.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
672	cmd.exe
1308	PING.EXE
2328	PING.EXE
4140	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
1308	PING.EXE
2328	PING.EXE
4140	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1864 wrote to memory of 3020	1864	2026-08-02_a0559c4e35fcbd2ed1e471878a35d329_elex_wannacry.exe	86
PID 3020 wrote to memory of 672	3020	WINWORD.exe	87
PID 672 wrote to memory of 1308	672	cmd.exe	89
PID 672 wrote to memory of 2328	672	cmd.exe	90
PID 672 wrote to memory of 4140	672	cmd.exe	93
PID 672 wrote to memory of 3148	672	cmd.exe	96

C:\Users\Admin\AppData\Local\Temp\2026-08-02_a0559c4e35fcbd2ed1e471878a35d329_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-02_a0559c4e35fcbd2ed1e471878a35d329_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1864
- 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:3020
- - 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\0000001D" 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:672
  - - 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:1308
  - - 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:2328
  - - 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:4140
  - - 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:3148

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

1

T1016

Internet Connection Discovery

1

T1016.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

0000001D

Path C:\Users\Admin\AppData\Roaming\Mozilla\0000001D
Size 37KB
SHA256 b26fda1e9f890e3086554b7c26b6b935614d827ffdacf202cb436612e25eddf7
MD5 2b4559c4444b3e1ed9d2dd978dac1a9e
SHA1 7e21f5597c9cc5f5a3529f01cec37277b8589767
SHA512 072b9c204cdec85843b932cbc402474f2b19174436e6eeec0e2a3fd6f6f971b2c1cbc3be803053bac61793c05cb5e92b0ec585dfa08fc89cb00da5ab492a96e5
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpZa5ywan:3LsF2Kerc64sTiX2IV0Dhuogwk
TLSH
T1FD035C1A299160A2D55310B0E9D82FB4C53D8C76106BB062F740BE59A8B3CD7DF72BCE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 37KB
SHA256 396176a16fe8504bac4a8651180b91f1cfc5c6423400de8df6d1cf7ebbcc725b
MD5 a0559c4e35fcbd2ed1e471878a35d329
SHA1 a1c436caa607599c50aa7a3658b199e4bbad04f5
SHA512 72d58a26874157277e875109c94b4fc4e9c1241392d94cd3ec645c321b3ea2728921df7c1d37e1aa80ab422ed4f7cdf60b4f0976a30c198bcf6d7539c1c7f00b
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpZa5ywaO:3LsF2Kerc64sTiX2IV0Dhuogwh
TLSH
T180035C1A299160A2D55310B0E9D82FB4C53D8C76106BB066F740BE59A8B3CD7DF72BCE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1864-0-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/1864-12-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/3020-14-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/3148-17-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/3148-18-0x0000000000400000-0x000000000041D000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads