juko | f0a5793801983a49db44a17f0ee81a58dea526b44f1198c85adcd777dbf6ced3

General

Target
2026-05-03_6b3b8e2c8ff76af42a0024407fa134da_elex_wannacry.exe
Size 47KB
Sample260503-hdchtacx5x
SHA256 f0a5793801983a49db44a17f0ee81a58dea526b44f1198c85adcd777dbf6ced3
MD5 6b3b8e2c8ff76af42a0024407fa134da
SHA1 2bb5a409dcbd11f2aa7c5fb20bde035645acd6bd
SHA512 c83e1eaa3390d1de9cac158dcf836e1703840966d9651e7ae8d9d466b6a4b795bc4b353ced4f06582558b48bcfae3eaf84514722e9beee935f1699dfb25169e8
SSDEEP 768:tyZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqZNPWQHmgyFIvA0vqxet2dMINJ8:t2LsF2Kerc64sTiX2IV0DOlgy6vlvqxu
TLSH
T17C235B173EA520C1D6D610B0EAA90F78843DEDB50127A152F780B65D2CB6E62DF71ECE
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/0x002600000002b1e0-4.dat	family_juko
behavioral2/files/0x001c00000002b35b-12.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
3356	WINWORD.exe
2532	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-1-5-21-3119821332-640943685-2562343641-1000\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	2026-05-03_6b3b8e2c8ff76af42a0024407fa134da_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

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
2584	PING.EXE
4304	PING.EXE
2028	PING.EXE
4604	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2584	PING.EXE
4304	PING.EXE
2028	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3500 wrote to memory of 3356	3500	2026-05-03_6b3b8e2c8ff76af42a0024407fa134da_elex_wannacry.exe	79
PID 3356 wrote to memory of 4604	3356	WINWORD.exe	80
PID 4604 wrote to memory of 2584	4604	cmd.exe	82
PID 4604 wrote to memory of 4304	4604	cmd.exe	83
PID 4604 wrote to memory of 2028	4604	cmd.exe	84
PID 4604 wrote to memory of 2532	4604	cmd.exe	85

C:\Users\Admin\AppData\Local\Temp\2026-05-03_6b3b8e2c8ff76af42a0024407fa134da_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-03_6b3b8e2c8ff76af42a0024407fa134da_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3500
- 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:3356
- - 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\00005227" 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:4604
  - - 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:2584
  - - 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:4304
  - - 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:2028
  - - 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:2532

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

00005227

Path C:\Users\Admin\AppData\Roaming\Mozilla\00005227
Size 47KB
SHA256 5ab8855d70c0dc100d4f95ac03cbd0caa2e5f8566ba01bdfb471adfd391592c2
MD5 851087c65eae11131add1cf6d0beb00a
SHA1 f877a0825e4e1b56d1e7ad977e505f9f5df1588d
SHA512 01653c474d642756e6fcf05a5f7a751d31491bf9115b77614758d27f064923e0362d110dd4af1525e389c637d996f24e90eec6594c8c78abe8be381b0636e0ec
SSDEEP 768:tyZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqZNPWQHmgyFIvA0vqxet2dMINJa:t2LsF2Kerc64sTiX2IV0DOlgy6vlvqxw
TLSH
T1C0235B173EA520C1D6D610B0EAA90F78843DEDB50127A152F780B65D2CB6E62DF71ECE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 47KB
SHA256 f0a5793801983a49db44a17f0ee81a58dea526b44f1198c85adcd777dbf6ced3
MD5 6b3b8e2c8ff76af42a0024407fa134da
SHA1 2bb5a409dcbd11f2aa7c5fb20bde035645acd6bd
SHA512 c83e1eaa3390d1de9cac158dcf836e1703840966d9651e7ae8d9d466b6a4b795bc4b353ced4f06582558b48bcfae3eaf84514722e9beee935f1699dfb25169e8
SSDEEP 768:tyZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqZNPWQHmgyFIvA0vqxet2dMINJ8:t2LsF2Kerc64sTiX2IV0DOlgy6vlvqxu
TLSH
T17C235B173EA520C1D6D610B0EAA90F78843DEDB50127A152F780B65D2CB6E62DF71ECE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

Replay Monitor

Loading Replay Monitor...

Downloads