juko | 38ff286cec3acc2eb03d0c4b673a7e678f22527b48b6714e93bd23acc33e9f6a

General

Target
2026-08-09_8a07f3531bdcc7037f18ac674e9fc8c9_elex_wannacry.exe
Size 37KB
Sample260809-en7vxstvay
SHA256 38ff286cec3acc2eb03d0c4b673a7e678f22527b48b6714e93bd23acc33e9f6a
MD5 8a07f3531bdcc7037f18ac674e9fc8c9
SHA1 9714392fef7fdafe47c38557882786d70adac7ca
SHA512 42713e5b71602bd8355f115cb34985bfa0133adaa5e81b3a52a0474f483e0875bd90e31d3e4c17102818a49532ae3d78ea3d58b9048f28e2e06d480f29858e3a
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpZa5ywaW:3LsF2Kerc64sTiX2IV0DhuogwZ
TLSH
T10E035C1A299160A2D55310B0E9D82FB4C53D8C76106BB062F740BE59A8B3CD7DF72BCE
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 8 IoCs

resource	yara_rule
behavioral1/memory/1908-0-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/files/0x00180000000243b5-5.dat	family_juko
behavioral1/memory/1908-12-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/memory/4636-13-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/memory/4636-15-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/files/0x000a00000002442e-16.dat	family_juko
behavioral1/memory/4180-18-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/memory/4180-19-0x0000000000400000-0x000000000041D000-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-1-5-21-668679576-120646659-2289335452-1000\Control Panel\International\Geo\Nation	2026-08-09_8a07f3531bdcc7037f18ac674e9fc8c9_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-668679576-120646659-2289335452-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
4636	WINWORD.exe
4180	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-1-5-21-668679576-120646659-2289335452-1000\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
4964	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	2026-08-09_8a07f3531bdcc7037f18ac674e9fc8c9_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
4716	PING.EXE
4964	cmd.exe
3448	PING.EXE
952	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3448	PING.EXE
952	PING.EXE
4716	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1908 wrote to memory of 4636	1908	2026-08-09_8a07f3531bdcc7037f18ac674e9fc8c9_elex_wannacry.exe	85
PID 4636 wrote to memory of 4964	4636	WINWORD.exe	86
PID 4964 wrote to memory of 3448	4964	cmd.exe	88
PID 4964 wrote to memory of 952	4964	cmd.exe	91
PID 4964 wrote to memory of 4716	4964	cmd.exe	94
PID 4964 wrote to memory of 4180	4964	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-09_8a07f3531bdcc7037f18ac674e9fc8c9_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-09_8a07f3531bdcc7037f18ac674e9fc8c9_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1908
- 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:4636
- - 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\00001617" 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:4964
  - - 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:3448
  - - 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:952
  - - 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:4716
  - - 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:4180

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

00001617

Path C:\Users\Admin\AppData\Roaming\Mozilla\00001617
Size 37KB
SHA256 020ccd7f77d9bf300a03115f3676856bdc81eb9215ee9716e9b8e3f7c3259e12
MD5 279a32c66735847d33ba6142b82a597d
SHA1 8dbc4e0739f5fd8a575a28db291ac65f2e53aef4
SHA512 2d84e63104ac72f9fd1b8f5eda4d915b856f40778bc140f2ecab4e25903867638fa294de14362a7508697fe0b3758fad1b26c24dc75868b7137e2ac0a17352b4
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpZa5ywa1:3LsF2Kerc64sTiX2IV0DhuogwW
TLSH
T154035C1A299160A2D55310B0E9D82FB4C53D8C76106BB062F740BE59A8B3CD7DF72BCE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 37KB
SHA256 38ff286cec3acc2eb03d0c4b673a7e678f22527b48b6714e93bd23acc33e9f6a
MD5 8a07f3531bdcc7037f18ac674e9fc8c9
SHA1 9714392fef7fdafe47c38557882786d70adac7ca
SHA512 42713e5b71602bd8355f115cb34985bfa0133adaa5e81b3a52a0474f483e0875bd90e31d3e4c17102818a49532ae3d78ea3d58b9048f28e2e06d480f29858e3a
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpZa5ywaW:3LsF2Kerc64sTiX2IV0DhuogwZ
TLSH
T10E035C1A299160A2D55310B0E9D82FB4C53D8C76106BB062F740BE59A8B3CD7DF72BCE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1908-0-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/1908-12-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4180-18-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4180-19-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4636-13-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4636-15-0x0000000000400000-0x000000000041D000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads