juko | b563a0c7a553eb365eaf49dbdd32d08b63cc4920fa0184596b6ae3cf75430bd3

General

Target
2026-08-18_e3af6238248d7cd059fcc0970881183a_elex_wannacry.exe
Size 50KB
Sample260818-2splgasbkh
SHA256 b563a0c7a553eb365eaf49dbdd32d08b63cc4920fa0184596b6ae3cf75430bd3
MD5 e3af6238248d7cd059fcc0970881183a
SHA1 5dc90c47a77fe627d6e1692675d6f7ad762de53f
SHA512 b7b65af05581adbe362e7a62275ddbe3dffdbaf9e43550bc7321a0f88421542401d287899a8a7cfdd8e2672b301f1369868287813f156d64ab446d07a7d18b4a
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqiNPWQHc8Sdq96AaWILO1:tLsF2Kerc64sTiX2IV0DpL8SE9nYO1
TLSH
T1DB33291A3B41E1D1C4A351B0EC5B4F74983AEDB58E276103BB85B70D1CB2A52CF3298E
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/0x001a000000024453-4.dat	family_juko
behavioral1/files/0x000b0000000244e6-12.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	2026-08-18_e3af6238248d7cd059fcc0970881183a_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
4340	WINWORD.exe
1064	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
3096	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	2026-08-18_e3af6238248d7cd059fcc0970881183a_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
3096	cmd.exe
3028	PING.EXE
4776	PING.EXE
1824	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3028	PING.EXE
4776	PING.EXE
1824	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2580 wrote to memory of 4340	2580	2026-08-18_e3af6238248d7cd059fcc0970881183a_elex_wannacry.exe	85
PID 4340 wrote to memory of 3096	4340	WINWORD.exe	86
PID 3096 wrote to memory of 3028	3096	cmd.exe	88
PID 3096 wrote to memory of 4776	3096	cmd.exe	91
PID 3096 wrote to memory of 1824	3096	cmd.exe	94
PID 3096 wrote to memory of 1064	3096	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-18_e3af6238248d7cd059fcc0970881183a_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-18_e3af6238248d7cd059fcc0970881183a_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2580
- 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:4340
- - 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\00000504" 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:3096
  - - 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:3028
  - - 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:4776
  - - 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:1824
  - - 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:1064

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

00000504

Path C:\Users\Admin\AppData\Roaming\Mozilla\00000504
Size 50KB
SHA256 d0d56f9e6209b9b182b2bc6c4e90d8573aacd3dd5c57756e2b08d19f8abb7a8f
MD5 8b62d1d1078ab90a45800fb7d5a08c18
SHA1 d86b97abbd0c10e8df9f827b24d0ba0e4220fc63
SHA512 90756e5a6e3056801d8c16befc0b23701772daa4f29cb9d1df3a478098690622459f9e501aff0d9ee373a08e084eecf7c596bee3e40cf5da362fef386e3f2f13
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqiNPWQHc8Sdq96AaWILO5:tLsF2Kerc64sTiX2IV0DpL8SE9nYO5
TLSH
T1FD33291A3B41E1D1C4A351B0EC5B4F74983AEDB58E276103BB85B70D1CB2A52CF7298E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 50KB
SHA256 b563a0c7a553eb365eaf49dbdd32d08b63cc4920fa0184596b6ae3cf75430bd3
MD5 e3af6238248d7cd059fcc0970881183a
SHA1 5dc90c47a77fe627d6e1692675d6f7ad762de53f
SHA512 b7b65af05581adbe362e7a62275ddbe3dffdbaf9e43550bc7321a0f88421542401d287899a8a7cfdd8e2672b301f1369868287813f156d64ab446d07a7d18b4a
SSDEEP 768:DZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqiNPWQHc8Sdq96AaWILO1:tLsF2Kerc64sTiX2IV0DpL8SE9nYO1
TLSH
T1DB33291A3B41E1D1C4A351B0EC5B4F74983AEDB58E276103BB85B70D1CB2A52CF3298E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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