juko | b389e919c54a5ef8a7a9b929aabd52842f758ce061eb33cd2d829a2f663eb0e7

General

Target
2026-07-20_cdd0f7cc38fe1522647f79b93c7ecf06_elex_wannacry.exe
Size 39KB
Sample260720-c18xmsft6s
SHA256 b389e919c54a5ef8a7a9b929aabd52842f758ce061eb33cd2d829a2f663eb0e7
MD5 cdd0f7cc38fe1522647f79b93c7ecf06
SHA1 ab2a1b0bee1a9aa9ffaa61b51011b80ec6fb7bf3
SHA512 5f670a0d8f7904ba81b9186ac3c5db442f63d50696c9b6cb571dd1f32545de5a6277ac41bdea3cc85a2cb5ea83880b00feec9248c6249f42e41b4203cefd3a96
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBN:aLsF2Kerc64sTiX2IV0DVyIGFe
TLSH
T1A7036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
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/4304-0-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x001000000001b1d0-5.dat	family_juko
behavioral2/memory/4304-9-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/4108-12-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x001600000001c4a0-13.dat	family_juko
behavioral2/memory/4600-15-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/4600-16-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4108	WINWORD.exe
4600	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-1-5-21-1738198120-2966725515-3980530802-1000\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
5800	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	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	2026-07-20_cdd0f7cc38fe1522647f79b93c7ecf06_elex_wannacry.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.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
5800	cmd.exe
5460	PING.EXE
4200	PING.EXE
6020	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
5460	PING.EXE
4200	PING.EXE
6020	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4304 wrote to memory of 4108	4304	2026-07-20_cdd0f7cc38fe1522647f79b93c7ecf06_elex_wannacry.exe	89
PID 4108 wrote to memory of 5800	4108	WINWORD.exe	90
PID 5800 wrote to memory of 5460	5800	cmd.exe	92
PID 5800 wrote to memory of 4200	5800	cmd.exe	93
PID 5800 wrote to memory of 6020	5800	cmd.exe	94
PID 5800 wrote to memory of 4600	5800	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-07-20_cdd0f7cc38fe1522647f79b93c7ecf06_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-20_cdd0f7cc38fe1522647f79b93c7ecf06_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4304
- 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:4108
- - 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\000056D2" 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:5800
  - - 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:5460
  - - 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:4200
  - - 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:6020
  - - 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:4600

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

000056D2

Path C:\Users\Admin\AppData\Roaming\Mozilla\000056D2
Size 39KB
SHA256 6b5d48b8c7aecd014bda4f6cfac113545e76b1b1098e91df4005f11c058dbbf9
MD5 8c44bcba99402a04d08cc8b0055d8202
SHA1 71fbafde41a778ceea1e415b3ee654d776734e66
SHA512 015f91bf5e3f73df7a6242cea40d8041be73bc733c93b0252c00c1756e5d461232212087c763147a4f12634f3728faae7b398f8840546040fb16d004a7b7b57e
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBT:aLsF2Kerc64sTiX2IV0DVyIGFw
TLSH
T105036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3CF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 39KB
SHA256 b389e919c54a5ef8a7a9b929aabd52842f758ce061eb33cd2d829a2f663eb0e7
MD5 cdd0f7cc38fe1522647f79b93c7ecf06
SHA1 ab2a1b0bee1a9aa9ffaa61b51011b80ec6fb7bf3
SHA512 5f670a0d8f7904ba81b9186ac3c5db442f63d50696c9b6cb571dd1f32545de5a6277ac41bdea3cc85a2cb5ea83880b00feec9248c6249f42e41b4203cefd3a96
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBN:aLsF2Kerc64sTiX2IV0DVyIGFe
TLSH
T1A7036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/4108-12-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4304-0-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4304-9-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4600-15-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4600-16-0x0000000000400000-0x000000000041D000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads