juko | 4125534ee5b67b6b6b90f612d9701e34234fed70b2d9eacf6cdf52099f92991d

General

Target
2026-05-05_9be535b83bcda0f2bba8e3026f3c3854_elex_wannacry.exe
Size 64KB
Sample260505-jpvdfaaz3x
SHA256 4125534ee5b67b6b6b90f612d9701e34234fed70b2d9eacf6cdf52099f92991d
MD5 9be535b83bcda0f2bba8e3026f3c3854
SHA1 e4c26bb786d10df0f7728e719519d28b107b47c3
SHA512 130823c7d522cc1d5360b715709a7b309ba814eba1f5966d2c928e75b22268877a7c63d5b3a6c0ab0e5ca21157b432d9a31c5f1a62f7327f59b74b5cb7affbcc
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/uS:sLy2Kerc64CiGIm8so28S
TLSH
T114535C2AA5A220B8C95780B0D5776B32D4397C350036767EA345FF312E71E12EB25E9E
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/0x001c00000002a117-4.dat	family_juko
behavioral2/files/0x001c00000002b423-14.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
2324	WINWORD.exe
6052	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-1-5-21-1456842261-3464001825-2855069093-1000\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	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
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_9be535b83bcda0f2bba8e3026f3c3854_elex_wannacry.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
1812	cmd.exe
1860	PING.EXE
5872	PING.EXE
5068	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
1860	PING.EXE
5872	PING.EXE
5068	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3076 wrote to memory of 2324	3076	2026-05-05_9be535b83bcda0f2bba8e3026f3c3854_elex_wannacry.exe	79
PID 2324 wrote to memory of 1812	2324	WINWORD.exe	80
PID 1812 wrote to memory of 1860	1812	cmd.exe	82
PID 1812 wrote to memory of 5872	1812	cmd.exe	83
PID 1812 wrote to memory of 5068	1812	cmd.exe	84
PID 1812 wrote to memory of 6052	1812	cmd.exe	85

C:\Users\Admin\AppData\Local\Temp\2026-05-05_9be535b83bcda0f2bba8e3026f3c3854_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-05_9be535b83bcda0f2bba8e3026f3c3854_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3076
- 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:2324
- - 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\00003953" 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:1812
  - - 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:1860
  - - 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:5872
  - - 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:5068
  - - 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:6052

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

00003953

Path C:\Users\Admin\AppData\Roaming\Mozilla\00003953
Size 64KB
SHA256 8af124256329dc003c13c7681e72257b44bbeea29516657df172804f4ecb03ca
MD5 dc6fe48963fa7a7bb182d5664dbe12af
SHA1 e55fbb941e8ab9c07b0c212322e14de13e790848
SHA512 fb1bed76cdf6b3b19cf7b7ca55e8381f839cccb957ab9aa079bb0c8f512e3d15e7cc652b11b9314b9ab4491a2bf2f218840f5d2ac4c63ae5c67b447729154963
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/uK:sLy2Kerc64CiGIm8so28K
TLSH
T100535C2AA5A220B8C95780B0D5776B32D4397C350036767EA345FF312E71E12EB25E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 64KB
SHA256 4125534ee5b67b6b6b90f612d9701e34234fed70b2d9eacf6cdf52099f92991d
MD5 9be535b83bcda0f2bba8e3026f3c3854
SHA1 e4c26bb786d10df0f7728e719519d28b107b47c3
SHA512 130823c7d522cc1d5360b715709a7b309ba814eba1f5966d2c928e75b22268877a7c63d5b3a6c0ab0e5ca21157b432d9a31c5f1a62f7327f59b74b5cb7affbcc
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/uS:sLy2Kerc64CiGIm8so28S
TLSH
T114535C2AA5A220B8C95780B0D5776B32D4397C350036767EA345FF312E71E12EB25E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2324-13-0x0000000002690000-0x000000000272C000-memory.dmp

Download

memory/3076-11-0x0000000002250000-0x00000000022EC000-memory.dmp

Download

memory/6052-16-0x0000000002DC0000-0x0000000002E5C000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads