juko | e799da6aba61b97a7c4e59b12abe6f97e7c6e90657402181e547808d01591892

General

Target
2026-08-17_2182ce3ed60b6977f3884fff3f7ab827_elex_wannacry.exe
Size 95KB
Sample260818-a2falsshqb
SHA256 e799da6aba61b97a7c4e59b12abe6f97e7c6e90657402181e547808d01591892
MD5 2182ce3ed60b6977f3884fff3f7ab827
SHA1 835499129ec8ec0f13281fc073b12f983feee0b6
SHA512 d938fd7c1882932b88b79808e798bf395deb1eaf6a91a839e0dca5f1884aa6e86e954acef8f6a473d3b099a9cd6052a194d96233648c29118444cc2569cf554e
SSDEEP 1536:JLsF2Kerc64sTiX2IV0DXJrdShIPoANJLlAXuSXv+qSFEAeOFN9:JLy2Kerc64CiGIm7JrshIPFJRAhP2EAB
TLSH
T1FD93CF167B986052D88A0470CA7F4F3584397C791426E213B3D27A1F2DB2A52EF73ADD
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/2496-0-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral2/files/0x000e00000001b87d-5.dat	family_juko
behavioral2/memory/2496-9-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral2/memory/4956-12-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral2/files/0x000f00000001c4c8-13.dat	family_juko
behavioral2/memory/2308-15-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral2/memory/2308-16-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4956	WINWORD.exe
2308	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-1-5-21-3797332335-34111092-3597280141-1000\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
5736	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	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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-08-17_2182ce3ed60b6977f3884fff3f7ab827_elex_wannacry.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
4512	PING.EXE
4156	PING.EXE
4204	PING.EXE
5736	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4512	PING.EXE
4156	PING.EXE
4204	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2496 wrote to memory of 4956	2496	2026-08-17_2182ce3ed60b6977f3884fff3f7ab827_elex_wannacry.exe	89
PID 4956 wrote to memory of 5736	4956	WINWORD.exe	90
PID 5736 wrote to memory of 4512	5736	cmd.exe	92
PID 5736 wrote to memory of 4156	5736	cmd.exe	93
PID 5736 wrote to memory of 4204	5736	cmd.exe	94
PID 5736 wrote to memory of 2308	5736	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-17_2182ce3ed60b6977f3884fff3f7ab827_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-17_2182ce3ed60b6977f3884fff3f7ab827_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2496
- 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:4956
- - 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\00004F68" 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:5736
  - - 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:4512
  - - 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:4156
  - - 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:4204
  - - 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:2308

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

00004F68

Path C:\Users\Admin\AppData\Roaming\Mozilla\00004F68
Size 95KB
SHA256 f53a134325606e179efb7a50d032cd9f983cbd8d82aa5f6db2e917ae1f6c338f
MD5 44b346a8ae62161be95e24c140f24277
SHA1 d9bf45b2ce6a253aece7429e5459a8d91684a8a5
SHA512 d3868d0e4c221517ec8e656719309637b0069f32a248ee7637e23351598defa833640e9794b4e51e8ea22b2351b0e0f6b1d4e034549cb0685427c2ea63ff676f
SSDEEP 1536:JLsF2Kerc64sTiX2IV0DXJrdShIPoANJLlAXuSXv+qSFEAeOFNN:JLy2Kerc64CiGIm7JrshIPFJRAhP2EAJ
TLSH
T15493CF167B986052D88A0470CA7F4F3584397C791426E213B3D27A1F2DB2A52EF73ADD
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 95KB
SHA256 e799da6aba61b97a7c4e59b12abe6f97e7c6e90657402181e547808d01591892
MD5 2182ce3ed60b6977f3884fff3f7ab827
SHA1 835499129ec8ec0f13281fc073b12f983feee0b6
SHA512 d938fd7c1882932b88b79808e798bf395deb1eaf6a91a839e0dca5f1884aa6e86e954acef8f6a473d3b099a9cd6052a194d96233648c29118444cc2569cf554e
SSDEEP 1536:JLsF2Kerc64sTiX2IV0DXJrdShIPoANJLlAXuSXv+qSFEAeOFN9:JLy2Kerc64CiGIm7JrshIPFJRAhP2EAB
TLSH
T1FD93CF167B986052D88A0470CA7F4F3584397C791426E213B3D27A1F2DB2A52EF73ADD
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2308-15-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/2308-16-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/2496-0-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/2496-9-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/4956-12-0x0000000000400000-0x000000000042B000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads