juko | 7aeebb924d6554d0799afec33a42f63ad3275b7289181bb99cdb49de720e2c77

General

Target
2026-08-04_3ce437176d3af321b5c4d9384eeb00c8_elex_wannacry.exe
Size 30KB
Sample260804-jglfkafd35
SHA256 7aeebb924d6554d0799afec33a42f63ad3275b7289181bb99cdb49de720e2c77
MD5 3ce437176d3af321b5c4d9384eeb00c8
SHA1 ef7d927765a3cf297427f511eaf855220297e776
SHA512 a21794f5804213aa6cd367ffd2ac10b58f0cba7b606f6723ef1cb34bcc7dbcad72ef7c21a137a1564b8e637a7ba44056bc9134b6e752103b316421d82ac6d964
SSDEEP 768:qZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqaNPWQHu:OLsF2Kerc64sTiX2IV0Dxx
TLSH
T1C8E27D3B7EA5C0A2C9D600F0F96D2F38C97E913A16799442CB400D4D3CB5DA6DAB1E4E
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/0x000700000000697a-4.dat	family_juko
behavioral2/files/0x000600000000bb41-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
5428	WINWORD.exe
4516	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-1-5-21-2115213192-531537726-3295841909-1000\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
5840	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	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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-08-04_3ce437176d3af321b5c4d9384eeb00c8_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

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
5840	cmd.exe
5552	PING.EXE
5932	PING.EXE
5072	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
5932	PING.EXE
5072	PING.EXE
5552	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1920 wrote to memory of 5428	1920	2026-08-04_3ce437176d3af321b5c4d9384eeb00c8_elex_wannacry.exe	88
PID 5428 wrote to memory of 5840	5428	WINWORD.exe	89
PID 5840 wrote to memory of 5552	5840	cmd.exe	91
PID 5840 wrote to memory of 5932	5840	cmd.exe	92
PID 5840 wrote to memory of 5072	5840	cmd.exe	93
PID 5840 wrote to memory of 4516	5840	cmd.exe	94

C:\Users\Admin\AppData\Local\Temp\2026-08-04_3ce437176d3af321b5c4d9384eeb00c8_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-04_3ce437176d3af321b5c4d9384eeb00c8_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1920
- 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:5428
- - 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\00000D8C" 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:5840
  - - 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:5552
  - - 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:5932
  - - 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:5072
  - - 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:4516

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

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Downloads

00000D8C

Path C:\Users\Admin\AppData\Roaming\Mozilla\00000D8C
Size 30KB
SHA256 0cdae8bf8dad5a5d7b9d230425038b65a0fe7bdb594565bcb2b2e90347b44298
MD5 ae07b1e16d82d7746f417cfbfd3fce40
SHA1 8fef85f3b5188a6f34e0c9eb8edb15b0d9d9bf3e
SHA512 a1440ffb487a71fa6613217f2a14b99adf2fa2c156a4e7876232846fd247db4359f7809cadcfeb1ade962e99292393d8e8e8ba6a6c07a8bffcc95a99735d55fc
SSDEEP 768:qZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqaNPWQH/:OLsF2Kerc64sTiX2IV0Dx4
TLSH
T141E27D3B7EA5C0A2C9D600F0F96D2F38C97E913A16799442CB400D4D3CB5DA6DAB1E4E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 30KB
SHA256 7aeebb924d6554d0799afec33a42f63ad3275b7289181bb99cdb49de720e2c77
MD5 3ce437176d3af321b5c4d9384eeb00c8
SHA1 ef7d927765a3cf297427f511eaf855220297e776
SHA512 a21794f5804213aa6cd367ffd2ac10b58f0cba7b606f6723ef1cb34bcc7dbcad72ef7c21a137a1564b8e637a7ba44056bc9134b6e752103b316421d82ac6d964
SSDEEP 768:qZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqaNPWQHu:OLsF2Kerc64sTiX2IV0Dxx
TLSH
T1C8E27D3B7EA5C0A2C9D600F0F96D2F38C97E913A16799442CB400D4D3CB5DA6DAB1E4E
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