juko | d61b6592c5ddf0b483cffcf99c83e094d7ce276932f6c38a1e9ec8bdc62a3b49

General

Target
2026-07-30_cace8e57acf7eaa527eccb557b3e7681_elex_wannacry.exe
Size 61KB
Sample260730-jk595ser5t
SHA256 d61b6592c5ddf0b483cffcf99c83e094d7ce276932f6c38a1e9ec8bdc62a3b49
MD5 cace8e57acf7eaa527eccb557b3e7681
SHA1 74c13041db30a86c5199c9bbc698dd74bb5af7a5
SHA512 62267f77682bee39a91dc6402bf7b3a8e79d94c87b9397e92696a1f7a4d9ccd89344d77f06911eee5ef21367f86a16484e9afe876f1e30c6a6cb7136e7e42692
SSDEEP 1536:yLsF2Kerc64sTiX2IV0DZZbyyCwlAY0VdTQZ:yLy2Kerc64CiGImVZuyp8Ty
TLSH
T1AC532C26B950B072D95220B06A6D6B36417A9DF10317A1D3E7407ADC68F2FD2EF306CE
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/2336-0-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/files/0x000c00000001b87e-5.dat	family_juko
behavioral2/memory/2336-10-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/memory/1724-12-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/files/0x000e00000001c532-13.dat	family_juko
behavioral2/memory/2848-15-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/memory/2848-16-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
1724	WINWORD.exe
2848	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-1-5-21-1875162379-3804078649-638427191-1000\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
4500	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	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-07-30_cace8e57acf7eaa527eccb557b3e7681_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
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
4500	cmd.exe
4676	PING.EXE
1728	PING.EXE
5752	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4676	PING.EXE
1728	PING.EXE
5752	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2336 wrote to memory of 1724	2336	2026-07-30_cace8e57acf7eaa527eccb557b3e7681_elex_wannacry.exe	89
PID 1724 wrote to memory of 4500	1724	WINWORD.exe	90
PID 4500 wrote to memory of 4676	4500	cmd.exe	92
PID 4500 wrote to memory of 1728	4500	cmd.exe	93
PID 4500 wrote to memory of 5752	4500	cmd.exe	94
PID 4500 wrote to memory of 2848	4500	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-07-30_cace8e57acf7eaa527eccb557b3e7681_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-30_cace8e57acf7eaa527eccb557b3e7681_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2336
- 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:1724
- - 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\00007D87" 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:4500
  - - 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:4676
  - - 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:1728
  - - 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:5752
  - - 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:2848

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

00007D87

Path C:\Users\Admin\AppData\Roaming\Mozilla\00007D87
Size 61KB
SHA256 063bead9bfc449cd94df122a052b73c257d9c7eebe65832c6bbb0174dd21aa67
MD5 e45d7aed122a7cfd7f746b6001e58c1c
SHA1 075bfb31b3effe6e4f3c32a7a017a5f62becbb80
SHA512 442c7ebf20e0bc94c79622c40c3f155cf168ca0463730a9e18734edf34b8248dee41404e282feb281a3107cf96427612b8f7deac3db50621e879ad4156639cff
SSDEEP 1536:yLsF2Kerc64sTiX2IV0DZZbyyCwlAY0VdTQS:yLy2Kerc64CiGImVZuyp8T5
TLSH
T1D1532C26B950B072D95220B06A6D6B36417A9DF10317A1D3E7407ADC68F2FD2EF306CE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 61KB
SHA256 d61b6592c5ddf0b483cffcf99c83e094d7ce276932f6c38a1e9ec8bdc62a3b49
MD5 cace8e57acf7eaa527eccb557b3e7681
SHA1 74c13041db30a86c5199c9bbc698dd74bb5af7a5
SHA512 62267f77682bee39a91dc6402bf7b3a8e79d94c87b9397e92696a1f7a4d9ccd89344d77f06911eee5ef21367f86a16484e9afe876f1e30c6a6cb7136e7e42692
SSDEEP 1536:yLsF2Kerc64sTiX2IV0DZZbyyCwlAY0VdTQZ:yLy2Kerc64CiGImVZuyp8Ty
TLSH
T1AC532C26B950B072D95220B06A6D6B36417A9DF10317A1D3E7407ADC68F2FD2EF306CE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1724-12-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/2336-0-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/2336-10-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/2848-15-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/2848-16-0x0000000000400000-0x0000000000422000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads