juko | a521be36144345338b40bbd5a930e4777bd5ce94e9b71cbd9a5edb06ba1ed4e7

General

Target
2026-08-16_9e1c6ebdce72bd34ce37a0b2ff4f0d49_elex_wannacry.exe
Size 32KB
Sample260816-vvbdassgkh
SHA256 a521be36144345338b40bbd5a930e4777bd5ce94e9b71cbd9a5edb06ba1ed4e7
MD5 9e1c6ebdce72bd34ce37a0b2ff4f0d49
SHA1 c1cd0496d1fc8c005963d0c111468a52652a35bd
SHA512 d3cfaa3fd47f74bea00848be3e966deb29e1e0c4476f38d9cf613f6456a3bbf4ba0d44a57baa8a0269d86f68b6df2c645355e49166d06ffb2582bfcde9d96b75
SSDEEP 768:J9ZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqNNPWQHf73:ZLsF2Kerc64sTiX2IV0DKy73
TLSH
T122E23B2B6AA57052C59320F0F9592F34C43D9DB9016BB062F7417B6928B2D63CF71ACE
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/0x001300000001b303-4.dat	family_juko
behavioral2/files/0x000b000000000441-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4112	WINWORD.exe
5920	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-1-5-21-4046655672-1449839301-2197395821-1000\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
5892	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	2026-08-16_9e1c6ebdce72bd34ce37a0b2ff4f0d49_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
5892	cmd.exe
1936	PING.EXE
3572	PING.EXE
2924	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
1936	PING.EXE
3572	PING.EXE
2924	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4284 wrote to memory of 4112	4284	2026-08-16_9e1c6ebdce72bd34ce37a0b2ff4f0d49_elex_wannacry.exe	89
PID 4112 wrote to memory of 5892	4112	WINWORD.exe	90
PID 5892 wrote to memory of 1936	5892	cmd.exe	92
PID 5892 wrote to memory of 3572	5892	cmd.exe	93
PID 5892 wrote to memory of 2924	5892	cmd.exe	94
PID 5892 wrote to memory of 5920	5892	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-16_9e1c6ebdce72bd34ce37a0b2ff4f0d49_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-16_9e1c6ebdce72bd34ce37a0b2ff4f0d49_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4284
- 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:4112
- - 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\000062EF" 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:5892
  - - 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:1936
  - - 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:3572
  - - 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:2924
  - - 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:5920

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

000062EF

Path C:\Users\Admin\AppData\Roaming\Mozilla\000062EF
Size 32KB
SHA256 f9a82be6469a336b1bc539cebdf6a426a5ace69ebd7f6558bf78e022f5898295
MD5 aa8dbf182efc92f073f1c4723aa432eb
SHA1 102a796efc6a48df8122609c51ae0ff444c4b576
SHA512 1fd49d5f6463b76eef00f0b7cd2cbcbbc1fcf207d573103c73e9417ee8bf092b48faed234eea69ee5a495016f2abb2cf0733614d18b540825f46d7c07cf20d1e
SSDEEP 768:J9ZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqNNPWQHf7w:ZLsF2Kerc64sTiX2IV0DKy7w
TLSH
T1D1E23B2B6AA57052C59320F0F9592F34C43D9DB9016BB062F7417B6928B2D63CF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 32KB
SHA256 a521be36144345338b40bbd5a930e4777bd5ce94e9b71cbd9a5edb06ba1ed4e7
MD5 9e1c6ebdce72bd34ce37a0b2ff4f0d49
SHA1 c1cd0496d1fc8c005963d0c111468a52652a35bd
SHA512 d3cfaa3fd47f74bea00848be3e966deb29e1e0c4476f38d9cf613f6456a3bbf4ba0d44a57baa8a0269d86f68b6df2c645355e49166d06ffb2582bfcde9d96b75
SSDEEP 768:J9ZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqNNPWQHf73:ZLsF2Kerc64sTiX2IV0DKy73
TLSH
T122E23B2B6AA57052C59320F0F9592F34C43D9DB9016BB062F7417B6928B2D63CF71ACE
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