juko | d2e2c0ccff4b0b54a59463e50b12a418ef688bf1d5e2aedff7b65f3dbe5aafff

General

Target
2026-06-03_afcb24bdbedd226c4f7633bde35754f2_elex_wannacry.exe
Size 47KB
Sample260603-eeb2wsax7k
SHA256 d2e2c0ccff4b0b54a59463e50b12a418ef688bf1d5e2aedff7b65f3dbe5aafff
MD5 afcb24bdbedd226c4f7633bde35754f2
SHA1 acb4fc522d03ef7c58b717f493f2ff64ec758940
SHA512 caac203d1b94393f1135176eaf46594c4b5ed8e8e771aedd68909fee0857d118f12ed5c1d4f6c5ba256561ca1a1c418ca447ca6bd7461e40aa635652f5d73bda
SSDEEP 768:tyZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqZNPWQHmgyFIvA0vqxet2dMINJK:t2LsF2Kerc64sTiX2IV0DOlgy6vlvqxE
TLSH
T1F3235B173EA520C1D6D610B0EAA90F78843DEDB50127A152F780B65D2CB6E62DF71ECE
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/0x000a000000025ad5-4.dat	family_juko
behavioral2/files/0x001b00000002b4dd-12.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
5016	WINWORD.exe
4948	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-1-5-21-2746394149-3500112804-1243524366-1000\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	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	2026-06-03_afcb24bdbedd226c4f7633bde35754f2_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
5316	cmd.exe
4912	PING.EXE
2652	PING.EXE
3972	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4912	PING.EXE
2652	PING.EXE
3972	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2388 wrote to memory of 5016	2388	2026-06-03_afcb24bdbedd226c4f7633bde35754f2_elex_wannacry.exe	80
PID 5016 wrote to memory of 5316	5016	WINWORD.exe	81
PID 5316 wrote to memory of 4912	5316	cmd.exe	83
PID 5316 wrote to memory of 2652	5316	cmd.exe	84
PID 5316 wrote to memory of 3972	5316	cmd.exe	85
PID 5316 wrote to memory of 4948	5316	cmd.exe	86

C:\Users\Admin\AppData\Local\Temp\2026-06-03_afcb24bdbedd226c4f7633bde35754f2_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-06-03_afcb24bdbedd226c4f7633bde35754f2_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2388
- 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:5016
- - 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\00000423" 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:5316
  - - 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:4912
  - - 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:2652
  - - 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:3972
  - - 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:4948

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

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Downloads

00000423

Path C:\Users\Admin\AppData\Roaming\Mozilla\00000423
Size 47KB
SHA256 4baaf26892ed9c91fa5fcb56c01975830e3644d25214f482d6606d065ffd73a7
MD5 e01c911f98fa055de4efb281643f0001
SHA1 f0ae64124cadb6c43185ada2be616bf76f169229
SHA512 c35a76408832b02663dc28ad365b947035108d09010e87d6c677387dacf427ba334ce9fdd64c61de7b80a0c8cee9a546df7ff1f35e487255d2adb7853e2021a3
SSDEEP 768:tyZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqZNPWQHmgyFIvA0vqxet2dMINJO:t2LsF2Kerc64sTiX2IV0DOlgy6vlvqxo
TLSH
T106235B173EA520C1D6D610B0EAA90F78843DEDB50127A152F780B65D2CB6E62DF71ECE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 47KB
SHA256 d2e2c0ccff4b0b54a59463e50b12a418ef688bf1d5e2aedff7b65f3dbe5aafff
MD5 afcb24bdbedd226c4f7633bde35754f2
SHA1 acb4fc522d03ef7c58b717f493f2ff64ec758940
SHA512 caac203d1b94393f1135176eaf46594c4b5ed8e8e771aedd68909fee0857d118f12ed5c1d4f6c5ba256561ca1a1c418ca447ca6bd7461e40aa635652f5d73bda
SSDEEP 768:tyZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqZNPWQHmgyFIvA0vqxet2dMINJK:t2LsF2Kerc64sTiX2IV0DOlgy6vlvqxE
TLSH
T1F3235B173EA520C1D6D610B0EAA90F78843DEDB50127A152F780B65D2CB6E62DF71ECE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads