juko | 735f27044d36e3952528fa8358d00c62fb0d16d3f4a5073dc615a6e5db74a042

General

Target
2026-07-18_89862def8d6e81e60f1b883ea15d9366_elex_wannacry.exe
Size 47KB
Sample260718-h3l4jsft6v
SHA256 735f27044d36e3952528fa8358d00c62fb0d16d3f4a5073dc615a6e5db74a042
MD5 89862def8d6e81e60f1b883ea15d9366
SHA1 10a966b2d435b08dff9e019c59893db6adcd94df
SHA512 4d85bbc288572f91b344a6f6a4f9579da69c57decaf55027a86c41cb7d5c6bb9244fd1498d4274c779352b551bef4ac731aa6c8ebbea413572549d3d9dd7d69e
SSDEEP 768:tyZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqZNPWQHmgyFIvA0vqxet2dMINJl:t2LsF2Kerc64sTiX2IV0DOlgy6vlvqxT
TLSH
T1CC235B173EA520C1D6D610B0EAA90F78843DEDB50127A152F780B65D2CB6E62DF71ECE
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 2 IoCs

resource	yara_rule
behavioral2/files/0x000a000000011380-4.dat	family_juko
behavioral2/files/0x001100000001c481-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
240	WINWORD.exe
5572	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-1-5-21-2246396966-3025826688-3847171515-1000\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
1312	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	2026-07-18_89862def8d6e81e60f1b883ea15d9366_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
2964	PING.EXE
3716	PING.EXE
1312	cmd.exe
4104	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3716	PING.EXE
4104	PING.EXE
2964	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1556 wrote to memory of 240	1556	2026-07-18_89862def8d6e81e60f1b883ea15d9366_elex_wannacry.exe	90
PID 240 wrote to memory of 1312	240	WINWORD.exe	91
PID 1312 wrote to memory of 4104	1312	cmd.exe	93
PID 1312 wrote to memory of 2964	1312	cmd.exe	94
PID 1312 wrote to memory of 3716	1312	cmd.exe	95
PID 1312 wrote to memory of 5572	1312	cmd.exe	96

C:\Users\Admin\AppData\Local\Temp\2026-07-18_89862def8d6e81e60f1b883ea15d9366_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-18_89862def8d6e81e60f1b883ea15d9366_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1556
- 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:240
- - 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\000050CC" 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:1312
  - - 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:4104
  - - 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:2964
  - - 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:3716
  - - 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:5572

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

Replay Monitor

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Downloads

000050CC

Path C:\Users\Admin\AppData\Roaming\Mozilla\000050CC
Size 47KB
SHA256 87513337a9b1f996f5f8ff42eab45ea5e8cbb5142dce0440452c36c7e08ce587
MD5 08949a64354ed7dbbd738255c58e61a3
SHA1 3d17074205d96b6f69d8254530a4c6077bb1e3be
SHA512 e9f4db5afcb3b0b7529d081c18c390f1f5d738d9759f952a078345ed3a9bc6322fb224fa92c7e8124d7bda098de46ad8a886be7a54a3e5574cc12b925a1cd835
SSDEEP 768:tyZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqZNPWQHmgyFIvA0vqxet2dMINJ5:t2LsF2Kerc64sTiX2IV0DOlgy6vlvqx7
TLSH
T14E235B173EA520C1D6D610B0EAA90F78843DEDB50127A152F780B65D2CB6E62DF71ECE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 47KB
SHA256 735f27044d36e3952528fa8358d00c62fb0d16d3f4a5073dc615a6e5db74a042
MD5 89862def8d6e81e60f1b883ea15d9366
SHA1 10a966b2d435b08dff9e019c59893db6adcd94df
SHA512 4d85bbc288572f91b344a6f6a4f9579da69c57decaf55027a86c41cb7d5c6bb9244fd1498d4274c779352b551bef4ac731aa6c8ebbea413572549d3d9dd7d69e
SSDEEP 768:tyZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqZNPWQHmgyFIvA0vqxet2dMINJl:t2LsF2Kerc64sTiX2IV0DOlgy6vlvqxT
TLSH
T1CC235B173EA520C1D6D610B0EAA90F78843DEDB50127A152F780B65D2CB6E62DF71ECE
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