juko | fd6f22f188909e01ad71bccdb313a174a51f483fe9c9fcaa5e3ba71f1c8dd152

General

Target
2026-07-29_a00937ce1d37d6662a748d6fcbe7e66e_elex_wannacry.exe
Size 49KB
Sample260729-2bth4afg85
SHA256 fd6f22f188909e01ad71bccdb313a174a51f483fe9c9fcaa5e3ba71f1c8dd152
MD5 a00937ce1d37d6662a748d6fcbe7e66e
SHA1 6abe46d487ec86e80bb0bb7789a3d5c184dd1397
SHA512 02daf29279ff7d1b154a26363729cf78a2f9d05cc143f619b294bcb8a049d7d93819591e6271d812d8e8eaf7533782adab0448d14525e3e319f27c1343526adc
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2t:VLy2Kerc64CiGImVucp4kojWh2t
TLSH
T170334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
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
behavioral2/memory/2952-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x001200000001b303-5.dat	family_juko
behavioral2/memory/2952-10-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/2964-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000e00000001c5ab-13.dat	family_juko
behavioral2/memory/3252-15-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/3252-16-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
2964	WINWORD.exe
3252	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-1-5-21-4046655672-1449839301-2197395821-1000\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
5376	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	2026-07-29_a00937ce1d37d6662a748d6fcbe7e66e_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
5376	cmd.exe
4628	PING.EXE
4272	PING.EXE
5852	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
5852	PING.EXE
4628	PING.EXE
4272	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2952 wrote to memory of 2964	2952	2026-07-29_a00937ce1d37d6662a748d6fcbe7e66e_elex_wannacry.exe	89
PID 2964 wrote to memory of 5376	2964	WINWORD.exe	90
PID 5376 wrote to memory of 4628	5376	cmd.exe	92
PID 5376 wrote to memory of 4272	5376	cmd.exe	93
PID 5376 wrote to memory of 5852	5376	cmd.exe	94
PID 5376 wrote to memory of 3252	5376	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-07-29_a00937ce1d37d6662a748d6fcbe7e66e_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-29_a00937ce1d37d6662a748d6fcbe7e66e_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2952
- 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:2964
- - 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\00003C7A" 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:5376
  - - 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:4628
  - - 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:4272
  - - 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:5852
  - - 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:3252

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

00003C7A

Path C:\Users\Admin\AppData\Roaming\Mozilla\00003C7A
Size 49KB
SHA256 006d4320708bc2971fd9583dba08ee60563945ba9cf1bd4db51e118c71b5e804
MD5 63dfd5055510d8e857e507d91ee3a739
SHA1 7b59575037d472891009ea27830850c22cd4b660
SHA512 ce69087feccdf8f004c59058bf2a770c371971c94ef14ccc33635d6ab1efdb36334226ecfc406ffb9c119e01fc4302ac0ea0cce8f57f659b85985f207e40f508
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2C:VLy2Kerc64CiGImVucp4kojWh2C
TLSH
T1E9334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 49KB
SHA256 fd6f22f188909e01ad71bccdb313a174a51f483fe9c9fcaa5e3ba71f1c8dd152
MD5 a00937ce1d37d6662a748d6fcbe7e66e
SHA1 6abe46d487ec86e80bb0bb7789a3d5c184dd1397
SHA512 02daf29279ff7d1b154a26363729cf78a2f9d05cc143f619b294bcb8a049d7d93819591e6271d812d8e8eaf7533782adab0448d14525e3e319f27c1343526adc
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h2t:VLy2Kerc64CiGImVucp4kojWh2t
TLSH
T170334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2952-0-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/2952-10-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/2964-12-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/3252-15-0x0000000000400000-0x0000000000420000-memory.dmp

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memory/3252-16-0x0000000000400000-0x0000000000420000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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