juko | 67b5e7cb400ae7c80b363461670fa833f63fca665c7000a3a5a688c6eb23897a

General

Target
2026-08-13_e35342f3f04143a2ee4ce8452443ba77_elex_wannacry.exe
Size 50KB
Sample260813-jsnp3atvcx
SHA256 67b5e7cb400ae7c80b363461670fa833f63fca665c7000a3a5a688c6eb23897a
MD5 e35342f3f04143a2ee4ce8452443ba77
SHA1 1e71726446582df948e5e3c04564cacc259821f6
SHA512 2941e49363aa2de9817ea20544c5e0ed0338354653e92fd8462fd41757776ac30c0b156eaf23d03835b1de1001f5710066a3d667830ed9e1325a6e537f8ad3eb
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqiNPWQHc8Sdq96AaWILOt:tLsF2Kerc64sTiX2IV0DpL8SE9nYOt
TLSH
T13633291A3B41E1D1C4A351B0EC5B4F74983AEDB58E276143BB85B70D1CB2A52CF3298E
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
behavioral1/files/0x000300000001e68e-4.dat	family_juko
behavioral1/files/0x000400000001e6d0-12.dat	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-1-5-21-1074038928-2032447174-945360078-1000\Control Panel\International\Geo\Nation	2026-08-13_e35342f3f04143a2ee4ce8452443ba77_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-1074038928-2032447174-945360078-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
3792	WINWORD.exe
3808	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-1-5-21-1074038928-2032447174-945360078-1000\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
4060	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	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-08-13_e35342f3f04143a2ee4ce8452443ba77_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

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
4060	cmd.exe
4488	PING.EXE
2316	PING.EXE
2828	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2316	PING.EXE
2828	PING.EXE
4488	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 960 wrote to memory of 3792	960	2026-08-13_e35342f3f04143a2ee4ce8452443ba77_elex_wannacry.exe	85
PID 3792 wrote to memory of 4060	3792	WINWORD.exe	86
PID 4060 wrote to memory of 4488	4060	cmd.exe	88
PID 4060 wrote to memory of 2316	4060	cmd.exe	89
PID 4060 wrote to memory of 2828	4060	cmd.exe	90
PID 4060 wrote to memory of 3808	4060	cmd.exe	91

C:\Users\Admin\AppData\Local\Temp\2026-08-13_e35342f3f04143a2ee4ce8452443ba77_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-13_e35342f3f04143a2ee4ce8452443ba77_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:960
- 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:3792
- - 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\0000652B" 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:4060
  - - 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:4488
  - - 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:2316
  - - 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:2828
  - - 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:3808

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

0000652B

Path C:\Users\Admin\AppData\Roaming\Mozilla\0000652B
Size 50KB
SHA256 272d4470641d614df3815b54724e042bb87d46168978a65c0ed131d5cd14119b
MD5 68ebc970646ba8169d7df7b72e8a59d8
SHA1 3fa711a89b3bd14b751eaab955aa1d3e86a422d5
SHA512 4e6145579693df816704643b72d6c51f6ef3b8f7cf982127db2cb64a015f32b1aaaf3b28bba364af493c98958f6bbe389b9a56e39c28d969c9cdb3d8cebe43b8
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqiNPWQHc8Sdq96AaWILOh:tLsF2Kerc64sTiX2IV0DpL8SE9nYOh
TLSH
T11F33291A3B41E1D1C4A351B0EC5B4F74983AEDB58E276103BB85B70D1CB2A52CF3298E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 50KB
SHA256 67b5e7cb400ae7c80b363461670fa833f63fca665c7000a3a5a688c6eb23897a
MD5 e35342f3f04143a2ee4ce8452443ba77
SHA1 1e71726446582df948e5e3c04564cacc259821f6
SHA512 2941e49363aa2de9817ea20544c5e0ed0338354653e92fd8462fd41757776ac30c0b156eaf23d03835b1de1001f5710066a3d667830ed9e1325a6e537f8ad3eb
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqiNPWQHc8Sdq96AaWILOt:tLsF2Kerc64sTiX2IV0DpL8SE9nYOt
TLSH
T13633291A3B41E1D1C4A351B0EC5B4F74983AEDB58E276143BB85B70D1CB2A52CF3298E
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