juko | 4ccfbd30626e06db3725667caa2b762229d71f5463fd2186a2dc31f51366e298

General

Target
2026-07-30_6d422b882f14b3982dd7e8bbb1bc8603_elex_wannacry.exe
Size 87KB
Sample260730-v39wtstcmb
SHA256 4ccfbd30626e06db3725667caa2b762229d71f5463fd2186a2dc31f51366e298
MD5 6d422b882f14b3982dd7e8bbb1bc8603
SHA1 002260504473f101d944acb87c9ae67de6ad3c05
SHA512 86aeae1eae39ec3a6b8a2652e092722678a864b3be81116a27e378f3b1d65bac8082dfd62d39825c13735a0b57cd2ee22834205291a6d25380ff97f2f3f5dc05
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpY:2Ly2Kerc64CiGIm1K851YO6EQkwpY
TLSH
T1E793A1763A259191C48BD138E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
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/3368-0-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/files/0x000d00000001136a-5.dat	family_juko
behavioral2/memory/3368-9-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/3376-12-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/files/0x000f00000001c486-13.dat	family_juko
behavioral2/memory/1364-15-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/1364-16-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
3376	WINWORD.exe
1364	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-1-5-21-552508041-2681165170-3229858294-1000\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
3812	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	2026-07-30_6d422b882f14b3982dd7e8bbb1bc8603_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
3812	cmd.exe
4568	PING.EXE
3788	PING.EXE
4344	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4568	PING.EXE
3788	PING.EXE
4344	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3368 wrote to memory of 3376	3368	2026-07-30_6d422b882f14b3982dd7e8bbb1bc8603_elex_wannacry.exe	89
PID 3376 wrote to memory of 3812	3376	WINWORD.exe	90
PID 3812 wrote to memory of 4568	3812	cmd.exe	92
PID 3812 wrote to memory of 3788	3812	cmd.exe	93
PID 3812 wrote to memory of 4344	3812	cmd.exe	94
PID 3812 wrote to memory of 1364	3812	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-07-30_6d422b882f14b3982dd7e8bbb1bc8603_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-30_6d422b882f14b3982dd7e8bbb1bc8603_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3368
- 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:3376
- - 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\00000359" 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:3812
  - - 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:4568
  - - 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:3788
  - - 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:4344
  - - 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:1364

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

00000359

Path C:\Users\Admin\AppData\Roaming\Mozilla\00000359
Size 87KB
SHA256 19fba4ac39dec0c58803505b26ea7cdf5cc2f7bc92ce435b3e133ea4a4a2c37b
MD5 5c29d0911f8d20b6cc0801828950d9cc
SHA1 9e9ffa2000142f1feca265411d52a60a15011b88
SHA512 0ab336b9726974188411920af73cdf14cda654aed942b88e581530ca72062b37766f8d82faaf51330d92e2e25c66b27d86fb64d99ab596e262103ffd2ec2f44c
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpZ:2Ly2Kerc64CiGIm1K851YO6EQkwpZ
TLSH
T13593A1763A259190C48BD138E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 87KB
SHA256 4ccfbd30626e06db3725667caa2b762229d71f5463fd2186a2dc31f51366e298
MD5 6d422b882f14b3982dd7e8bbb1bc8603
SHA1 002260504473f101d944acb87c9ae67de6ad3c05
SHA512 86aeae1eae39ec3a6b8a2652e092722678a864b3be81116a27e378f3b1d65bac8082dfd62d39825c13735a0b57cd2ee22834205291a6d25380ff97f2f3f5dc05
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpY:2Ly2Kerc64CiGIm1K851YO6EQkwpY
TLSH
T1E793A1763A259191C48BD138E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1364-15-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/1364-16-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/3368-0-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/3368-9-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/3376-12-0x0000000000400000-0x0000000000425000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads