juko | 3854ff63837168863cf7deb01f0091cab5eea8387ea32f7642399f071237d3f3

General

Target
2026-08-09_d755ad2ff122eecc87af3e78af83e2d1_elex_wannacry.exe
Size 30KB
Sample260809-tcd6sshm9w
SHA256 3854ff63837168863cf7deb01f0091cab5eea8387ea32f7642399f071237d3f3
MD5 d755ad2ff122eecc87af3e78af83e2d1
SHA1 9e74e1c5acc82255a197d5a511706f8c94fb69a9
SHA512 4e6ae35d4d38bdaef73067864d5dc86d8dfb121f9256bc866b1f593161c751037e7a1f2a8f9999d47c1044df687533f0771be6d8016a8104e769b8c7832c787d
SSDEEP 768:qZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqkkzNPWQHrw:OLsF2Kerc64sTiX2IV0DkFMw
TLSH
T187E27D2E3EA28053C5D700F0E9A91F78C97E953B2569A05BCB400D4D3CF1D65DAB1E9E
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/0x000700000001b86d-4.dat	family_juko
behavioral2/files/0x001000000001c489-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4180	WINWORD.exe
4296	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-1-5-21-189034102-168398478-1159367937-1000\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
4204	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	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-08-09_d755ad2ff122eecc87af3e78af83e2d1_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
4204	cmd.exe
3432	PING.EXE
5556	PING.EXE
1544	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3432	PING.EXE
5556	PING.EXE
1544	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4492 wrote to memory of 4180	4492	2026-08-09_d755ad2ff122eecc87af3e78af83e2d1_elex_wannacry.exe	89
PID 4180 wrote to memory of 4204	4180	WINWORD.exe	90
PID 4204 wrote to memory of 3432	4204	cmd.exe	92
PID 4204 wrote to memory of 5556	4204	cmd.exe	93
PID 4204 wrote to memory of 1544	4204	cmd.exe	94
PID 4204 wrote to memory of 4296	4204	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-09_d755ad2ff122eecc87af3e78af83e2d1_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-09_d755ad2ff122eecc87af3e78af83e2d1_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4492
- 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:4180
- - 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\0000767A" 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:4204
  - - 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:3432
  - - 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:5556
  - - 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:1544
  - - 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:4296

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

Loading Replay Monitor...

Downloads

0000767A

Path C:\Users\Admin\AppData\Roaming\Mozilla\0000767A
Size 30KB
SHA256 ec5404f9c642c8d97328fc54277d15084b278694718448285fb43952041db48f
MD5 d6cd73eb4e35bfc66ec706f1a5a7d4f3
SHA1 544e37bf84f288361a79a9fbd400ea8e818fac5b
SHA512 a6d0588ed2c3ea06a96aebe30651dbea6c88983a22614211dcdf71cfe99ae894e07a6c4bbda144a5a345bda7bf3dea1662d54d109bbb43dbba115b959a193268
SSDEEP 768:qZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqkkzNPWQHr+:OLsF2Kerc64sTiX2IV0DkFM+
TLSH
T171E27D2E3EA28053C5D700F0E9A91F78C97E953B2569A05BCB400D4D3CF1D65DAB1E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 30KB
SHA256 3854ff63837168863cf7deb01f0091cab5eea8387ea32f7642399f071237d3f3
MD5 d755ad2ff122eecc87af3e78af83e2d1
SHA1 9e74e1c5acc82255a197d5a511706f8c94fb69a9
SHA512 4e6ae35d4d38bdaef73067864d5dc86d8dfb121f9256bc866b1f593161c751037e7a1f2a8f9999d47c1044df687533f0771be6d8016a8104e769b8c7832c787d
SSDEEP 768:qZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqkkzNPWQHrw:OLsF2Kerc64sTiX2IV0DkFMw
TLSH
T187E27D2E3EA28053C5D700F0E9A91F78C97E953B2569A05BCB400D4D3CF1D65DAB1E9E
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