juko | 42b39e60c683ca3b574d866617f9316d2293d0b2636754897f54bccc96fb2ef8

General

Target
2026-07-18_77a03617b31f877e7fcb06cf40207f83_elex_wannacry.exe
Size 64KB
Sample260718-m55e5ahs6j
SHA256 42b39e60c683ca3b574d866617f9316d2293d0b2636754897f54bccc96fb2ef8
MD5 77a03617b31f877e7fcb06cf40207f83
SHA1 c80333b820fabadd0447230f2b4cf68f7d9325a3
SHA512 5212b62a5f605ffacd0c2475b154ae7d56a9fa1955a913586ce95e345e2abc9864a1b5790e494e3a646988c0af5cedc26ac720ecd3598cfe2dce07e6663ade0c
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/uo:sLy2Kerc64CiGIm8so28o
TLSH
T1A4535C2AA5A220B8C95780B0D5776B32D4397C350036767EA345FF312E71E12EB25E9E
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/0x00080000000187d5-4.dat	family_juko
behavioral2/files/0x001300000001c43e-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4728	WINWORD.exe
5480	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-1-5-21-1875162379-3804078649-638427191-1000\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
3016	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	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-07-18_77a03617b31f877e7fcb06cf40207f83_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

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
3016	cmd.exe
1472	PING.EXE
2600	PING.EXE
5132	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
1472	PING.EXE
2600	PING.EXE
5132	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4136 wrote to memory of 4728	4136	2026-07-18_77a03617b31f877e7fcb06cf40207f83_elex_wannacry.exe	90
PID 4728 wrote to memory of 3016	4728	WINWORD.exe	91
PID 3016 wrote to memory of 1472	3016	cmd.exe	93
PID 3016 wrote to memory of 2600	3016	cmd.exe	94
PID 3016 wrote to memory of 5132	3016	cmd.exe	95
PID 3016 wrote to memory of 5480	3016	cmd.exe	96

C:\Users\Admin\AppData\Local\Temp\2026-07-18_77a03617b31f877e7fcb06cf40207f83_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-18_77a03617b31f877e7fcb06cf40207f83_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4136
- 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:4728
- - 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\000015CC" 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:3016
  - - 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:1472
  - - 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:2600
  - - 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:5132
  - - 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:5480

C:\Windows\system32\svchost.exe
C:\Windows\system32\svchost.exe -k GPSvcGroup
1⤵
PID:6028

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

000015CC

Path C:\Users\Admin\AppData\Roaming\Mozilla\000015CC
Size 64KB
SHA256 144120a370d8c5ba3cb4fb98bb6dcfa3bb23b4ddc17deebe4715742d49a6763b
MD5 896be8bd96c087ba65686c2d78a5c676
SHA1 fdc8e242717f3d3b9cab352cfd4f31cb62b85f22
SHA512 84277567e7d87df54d28ebe12235742608a07c33e27b437b53145e9fd58c0e30d60e133bf2b36e9db205b3b9d59aa574d25551a344bff1e0aa4ac08825c7f0da
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/uB:sLy2Kerc64CiGIm8so28B
TLSH
T10D535C2AA5A220B8C95780B0D5776B32D4397C350036767EA345FF312E71E12EB25E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 64KB
SHA256 42b39e60c683ca3b574d866617f9316d2293d0b2636754897f54bccc96fb2ef8
MD5 77a03617b31f877e7fcb06cf40207f83
SHA1 c80333b820fabadd0447230f2b4cf68f7d9325a3
SHA512 5212b62a5f605ffacd0c2475b154ae7d56a9fa1955a913586ce95e345e2abc9864a1b5790e494e3a646988c0af5cedc26ac720ecd3598cfe2dce07e6663ade0c
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/uo:sLy2Kerc64CiGIm8so28o
TLSH
T1A4535C2AA5A220B8C95780B0D5776B32D4397C350036767EA345FF312E71E12EB25E9E
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