juko | aaee6439741469942298275d3c445b3461a98d9ac71da72a34a29d8e33d55633

General

Target
2026-08-25_95171de69358c4d4f2bbadfc8b130f67_elex_wannacry.exe
Size 57KB
Sample260826-vfc9cazyav
SHA256 aaee6439741469942298275d3c445b3461a98d9ac71da72a34a29d8e33d55633
MD5 95171de69358c4d4f2bbadfc8b130f67
SHA1 f0f6785ca7a4d562510281fd8fe03926254ab7db
SHA512 73f1ea03e515a5c72a0196f4ad355db7603b2454c1163e107d43df0d73bdc905c4f75ace2893e2c045b5f591409644767e1f6bd9e83503ee0237446f8b1093a5
SSDEEP 1536:qLsF2Kerc64sTiX2IV0DYlNpyyCwlAY0VdTQt:qLy2Kerc64CiGImklNUyp8TW
TLSH
T1D5433C16B950B072D99220B06A6D6B36417A9DF10317A1D3E7407ADD68F2FD2EF306CE
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 7 IoCs

resource	yara_rule
behavioral2/memory/4936-0-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/files/0x000e00000001b86e-4.dat	family_juko
behavioral2/memory/4936-10-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/memory/908-12-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/files/0x001000000001c57d-13.dat	family_juko
behavioral2/memory/5328-15-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/memory/5328-16-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
908	WINWORD.exe
5328	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-1-5-21-552508041-2681165170-3229858294-1000\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
2780	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	2026-08-25_95171de69358c4d4f2bbadfc8b130f67_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
2780	cmd.exe
5828	PING.EXE
4116	PING.EXE
728	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
728	PING.EXE
5828	PING.EXE
4116	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4936 wrote to memory of 908	4936	2026-08-25_95171de69358c4d4f2bbadfc8b130f67_elex_wannacry.exe	89
PID 908 wrote to memory of 2780	908	WINWORD.exe	90
PID 2780 wrote to memory of 5828	2780	cmd.exe	92
PID 2780 wrote to memory of 4116	2780	cmd.exe	93
PID 2780 wrote to memory of 728	2780	cmd.exe	94
PID 2780 wrote to memory of 5328	2780	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-25_95171de69358c4d4f2bbadfc8b130f67_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-25_95171de69358c4d4f2bbadfc8b130f67_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4936
- 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:908
- - 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\000069C0" 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:2780
  - - 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:5828
  - - 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:4116
  - - 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:728
  - - 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:5328

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

000069C0

Path C:\Users\Admin\AppData\Roaming\Mozilla\000069C0
Size 57KB
SHA256 9f66cc796652216215f8b09c32f38528dc787b4866f9e1c62cacc6467e98833d
MD5 eb47c0d91aa0415fcfd8cf1189847d84
SHA1 7a763d35081986ff41a213ea4cacd62565c66877
SHA512 dde6a822022ae5272014d9b59e6002c3288663a390ce4ac314d7cdd7e70f92e54d93c0af8573b89cff2bd314ff0ffc634ca6641504d69b0305a71e851b9d6ce8
SSDEEP 1536:qLsF2Kerc64sTiX2IV0DYlNpyyCwlAY0VdTQr:qLy2Kerc64CiGImklNUyp8T4
TLSH
T1CB433C16B950B072D99220B06A6D6B36417A9DF10317A1D3E7407ADD68F2FD2EF306CE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 57KB
SHA256 aaee6439741469942298275d3c445b3461a98d9ac71da72a34a29d8e33d55633
MD5 95171de69358c4d4f2bbadfc8b130f67
SHA1 f0f6785ca7a4d562510281fd8fe03926254ab7db
SHA512 73f1ea03e515a5c72a0196f4ad355db7603b2454c1163e107d43df0d73bdc905c4f75ace2893e2c045b5f591409644767e1f6bd9e83503ee0237446f8b1093a5
SSDEEP 1536:qLsF2Kerc64sTiX2IV0DYlNpyyCwlAY0VdTQt:qLy2Kerc64CiGImklNUyp8TW
TLSH
T1D5433C16B950B072D99220B06A6D6B36417A9DF10317A1D3E7407ADD68F2FD2EF306CE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/908-12-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/4936-0-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/4936-10-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/5328-15-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/5328-16-0x0000000000400000-0x0000000000422000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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