juko | 7a46d99b55d5d5dcc52b4b38ba5fe155086cc45945fc7cb78d01f9372d6dc245

General

Target
2026-08-02_1032523e70c0a3437560f30f7979ddd9_elex_wannacry.exe
Size 53KB
Sample260802-11hmfssgme
SHA256 7a46d99b55d5d5dcc52b4b38ba5fe155086cc45945fc7cb78d01f9372d6dc245
MD5 1032523e70c0a3437560f30f7979ddd9
SHA1 63062d6457fdb8a1559bf977c80673056c0bd01a
SHA512 b3e06357bbfb145c3d46e0e6ed31151cba30cc4dbf11d955d4db99551d6e3f8ad7715639b48feaa150ea4fe5adb933b5a74e4991c46bfdc08d9d415648817901
SSDEEP 1536:3LsF2Kerc64sTiX2IV0D5tcz9Kf8pOOq2L:3Ly2Kerc64CiGIm1tcBMUOOFL
TLSH
T1C3335C176A459056C0BB52B0FC884F30823AADB405B7B213B349B65D1CB2E52DFB1DBE
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/0x000b00000001b87f-4.dat	family_juko
behavioral2/files/0x001600000001c4a0-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
784	WINWORD.exe
3144	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-1-5-21-1738198120-2966725515-3980530802-1000\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
4944	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	2026-08-02_1032523e70c0a3437560f30f7979ddd9_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
4944	cmd.exe
4716	PING.EXE
2672	PING.EXE
3372	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4716	PING.EXE
2672	PING.EXE
3372	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5644 wrote to memory of 784	5644	2026-08-02_1032523e70c0a3437560f30f7979ddd9_elex_wannacry.exe	89
PID 784 wrote to memory of 4944	784	WINWORD.exe	90
PID 4944 wrote to memory of 4716	4944	cmd.exe	92
PID 4944 wrote to memory of 2672	4944	cmd.exe	93
PID 4944 wrote to memory of 3372	4944	cmd.exe	94
PID 4944 wrote to memory of 3144	4944	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-02_1032523e70c0a3437560f30f7979ddd9_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-02_1032523e70c0a3437560f30f7979ddd9_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5644
- 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:784
- - 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\00005DFD" 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:4944
  - - 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:4716
  - - 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:2672
  - - 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:3372
  - - 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:3144

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

00005DFD

Path C:\Users\Admin\AppData\Roaming\Mozilla\00005DFD
Size 53KB
SHA256 f8d2aeee68a354584931cc6fb6f39b3fb5e626f1424420cbfe7395fe097f9256
MD5 11e2024026e8ac00176f30512556810c
SHA1 e27b335f32a7b86b493f83c47418352a2cf10476
SHA512 a3086a83485435cd160a1475bf5dc62b8021383174241d485e77306acca54bf6618c2435d12b996bfc006a03f64aa41d83f7d79b6f8782896d3f928888007bf8
SSDEEP 1536:3LsF2Kerc64sTiX2IV0D5tcz9Kf8pOOq2Z:3Ly2Kerc64CiGIm1tcBMUOOFZ
TLSH
T1C5335C176A459056C0BB52B0FC884F30823AADB405B7B213B349B65D1CB2E52DFB1DBE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 53KB
SHA256 7a46d99b55d5d5dcc52b4b38ba5fe155086cc45945fc7cb78d01f9372d6dc245
MD5 1032523e70c0a3437560f30f7979ddd9
SHA1 63062d6457fdb8a1559bf977c80673056c0bd01a
SHA512 b3e06357bbfb145c3d46e0e6ed31151cba30cc4dbf11d955d4db99551d6e3f8ad7715639b48feaa150ea4fe5adb933b5a74e4991c46bfdc08d9d415648817901
SSDEEP 1536:3LsF2Kerc64sTiX2IV0D5tcz9Kf8pOOq2L:3Ly2Kerc64CiGIm1tcBMUOOFL
TLSH
T1C3335C176A459056C0BB52B0FC884F30823AADB405B7B213B349B65D1CB2E52DFB1DBE
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