juko | d309a8b58a515249129a1131aaf2434a96f8e5d33a6b793588b5d604a730ece9

General

Target
2026-05-05_ca4070a84b4e26a2f0920247a520eff1_elex_wannacry.exe
Size 64KB
Sample260505-ynhetaaz3l
SHA256 d309a8b58a515249129a1131aaf2434a96f8e5d33a6b793588b5d604a730ece9
MD5 ca4070a84b4e26a2f0920247a520eff1
SHA1 0e990e5c85e64de1c36a59e9c01b0dfa416956d0
SHA512 5564d3ecf5d8fc9cd7471ed305f4ae9800fd5f357120e3aaee4f64dd53b584dbea8954b26f43ff00799b178d2b8174db01b2529d90e3ff44ce947cb0b5189954
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/uI:sLy2Kerc64CiGIm8so28I
TLSH
T1A7535C2AA5A220B8C95780B0D5776B32D4397C350036767EA345FF312E71E12EB25E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

discovery 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/0x0011000000027002-4.dat	family_juko
behavioral2/files/0x000400000002a78c-12.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
1192	WINWORD.exe
3956	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-1-5-21-600123060-2148212387-2211176695-1000\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

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	2026-05-05_ca4070a84b4e26a2f0920247a520eff1_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
6124	cmd.exe
756	PING.EXE
3652	PING.EXE
3768	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
756	PING.EXE
3652	PING.EXE
3768	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3112 wrote to memory of 1192	3112	2026-05-05_ca4070a84b4e26a2f0920247a520eff1_elex_wannacry.exe	80
PID 1192 wrote to memory of 6124	1192	WINWORD.exe	81
PID 6124 wrote to memory of 756	6124	cmd.exe	83
PID 6124 wrote to memory of 3652	6124	cmd.exe	84
PID 6124 wrote to memory of 3768	6124	cmd.exe	85
PID 6124 wrote to memory of 3956	6124	cmd.exe	86

C:\Users\Admin\AppData\Local\Temp\2026-05-05_ca4070a84b4e26a2f0920247a520eff1_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-05_ca4070a84b4e26a2f0920247a520eff1_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3112
- 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:1192
- - 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\00002041" WINWORD.exe&ping 127.0.0.1 -n 2&"C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" \r
    3⤵
    - System Location Discovery: System Language Discovery
    - System Network Configuration Discovery: Internet Connection Discovery
    - Suspicious use of WriteProcessMemory
    PID:6124
  - - 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:756
  - - 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:3652
  - - 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:3768
  - - 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:3956

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

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

00002041

Path C:\Users\Admin\AppData\Roaming\Mozilla\00002041
Size 64KB
SHA256 c0090f60925c4438be6bcc28a432227e650d3e9b403cea7216c05d7aff63f681
MD5 c2471eeabd7f2d39868bfeffa2907475
SHA1 74dbdbf4209286e0da5290fe9fa50b818d97e50e
SHA512 204b78bd26a23c2fa1b32a7f57fa8f83fd6e35356150f0b5c60e802134505ec53602b973ed59b8dc9af368c139ab73da44360d935955a1afa51e01d75d93cb8a
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/u0:sLy2Kerc64CiGIm8so280
TLSH
T12A535C2AA5A220B8C95780B0D5776B32D4397C350036767EA345FF312E71E12EB25E9E
MD5 SHA1 SHA512 SSDEEP TLSH

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WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 64KB
SHA256 d309a8b58a515249129a1131aaf2434a96f8e5d33a6b793588b5d604a730ece9
MD5 ca4070a84b4e26a2f0920247a520eff1
SHA1 0e990e5c85e64de1c36a59e9c01b0dfa416956d0
SHA512 5564d3ecf5d8fc9cd7471ed305f4ae9800fd5f357120e3aaee4f64dd53b584dbea8954b26f43ff00799b178d2b8174db01b2529d90e3ff44ce947cb0b5189954
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/uI:sLy2Kerc64CiGIm8so28I
TLSH
T1A7535C2AA5A220B8C95780B0D5776B32D4397C350036767EA345FF312E71E12EB25E9E
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