juko | b3cb62274d15406ad0d222913b9870c012079d779232ca6cb53a472b4e1e424d

General

Target
2026-04-26_7b08c1f36b8b037fd66303da576a219a_elex_wannacry.exe
Size 94KB
Sample260426-t2fe6abt21
SHA256 b3cb62274d15406ad0d222913b9870c012079d779232ca6cb53a472b4e1e424d
MD5 7b08c1f36b8b037fd66303da576a219a
SHA1 1e6000794e7bbc86aafbf6889e307127ad59e31f
SHA512 f60465e4ef2e08148edbd93233df01b52d52ed2d8f7c965316cd47c2aeeaf63cf1de5150400fe8d15bfb7eb741b15a24d55d8e1b15a40a24a4450950eda94a9b
SSDEEP 1536:RLsF2Kerc64sTiX2IV0DxY8rqBLSaVl17oMvTbMvY4+oi9u6G6/Ni:RLy2Kerc64CiGImFYgUBWTb4/Ni
TLSH
T1F9937C2157A85153F0B246B0AD761B3098B97CB56AB3B21EBB03774D1871D21FF34B8A
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 7 IoCs

resource	yara_rule
behavioral2/memory/4712-0-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral2/files/0x002000000002b192-5.dat	family_juko
behavioral2/memory/4712-12-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral2/memory/2328-14-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral2/files/0x001d00000002b28e-15.dat	family_juko
behavioral2/memory/1760-17-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral2/memory/1760-18-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
2328	WINWORD.exe
1760	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-1-5-21-1383858298-2057492509-1726743289-1000\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	2026-04-26_7b08c1f36b8b037fd66303da576a219a_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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	PING.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
3876	cmd.exe
1940	PING.EXE
2836	PING.EXE
2852	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2836	PING.EXE
2852	PING.EXE
1940	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4712 wrote to memory of 2328	4712	2026-04-26_7b08c1f36b8b037fd66303da576a219a_elex_wannacry.exe	80
PID 2328 wrote to memory of 3876	2328	WINWORD.exe	81
PID 3876 wrote to memory of 1940	3876	cmd.exe	83
PID 3876 wrote to memory of 2836	3876	cmd.exe	84
PID 3876 wrote to memory of 2852	3876	cmd.exe	85
PID 3876 wrote to memory of 1760	3876	cmd.exe	86

C:\Users\Admin\AppData\Local\Temp\2026-04-26_7b08c1f36b8b037fd66303da576a219a_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-04-26_7b08c1f36b8b037fd66303da576a219a_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4712
- 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:2328
- - 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\0000465C" 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:3876
  - - 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:1940
  - - 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:2836
  - - 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:2852
  - - 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:1760

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

Replay Monitor

Loading Replay Monitor...

Downloads

0000465C

Path C:\Users\Admin\AppData\Roaming\Mozilla\0000465C
Size 94KB
SHA256 304d2d0955dc9f658e185430c2b0d2d556d38233926d2392492cfa439b160ea8
MD5 a0dd07bd03fcf0550706cc0157402f9e
SHA1 03db8b93a4983ecd554e77e5e3dce334b8d48cf1
SHA512 c7240be27a180bc10313d64dad329dfc8821cca3459b8f9ae95e8347b832d46918fadc47cd18cb68dda714f6ed3dda0dcf1a9b2ff2d03c8916175e5d7849ed34
SSDEEP 1536:RLsF2Kerc64sTiX2IV0DxY8rqBLSaVl17oMvTbMvY4+oi9u6G6/Ng:RLy2Kerc64CiGImFYgUBWTb4/Ng
TLSH
T1A2937C2157A85153F0B246B0AD761B3098B97CB56AB3B21EBB03774D1871D21FF34B8A
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 94KB
SHA256 b3cb62274d15406ad0d222913b9870c012079d779232ca6cb53a472b4e1e424d
MD5 7b08c1f36b8b037fd66303da576a219a
SHA1 1e6000794e7bbc86aafbf6889e307127ad59e31f
SHA512 f60465e4ef2e08148edbd93233df01b52d52ed2d8f7c965316cd47c2aeeaf63cf1de5150400fe8d15bfb7eb741b15a24d55d8e1b15a40a24a4450950eda94a9b
SSDEEP 1536:RLsF2Kerc64sTiX2IV0DxY8rqBLSaVl17oMvTbMvY4+oi9u6G6/Ni:RLy2Kerc64CiGImFYgUBWTb4/Ni
TLSH
T1F9937C2157A85153F0B246B0AD761B3098B97CB56AB3B21EBB03774D1871D21FF34B8A
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1760-17-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/1760-18-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/2328-14-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/4712-0-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/4712-12-0x0000000000400000-0x000000000042B000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

Replay Monitor

Loading Replay Monitor...

Downloads