juko | 62c5f27cf05396c42439e5ca2652efce47d66095c49543d23640b373bf336ec5

General

Target
2026-08-13_b171b29ba637bff5578707d84a5c17dc_elex_wannacry.exe
Size 87KB
Sample260813-kavlbsvfmd
SHA256 62c5f27cf05396c42439e5ca2652efce47d66095c49543d23640b373bf336ec5
MD5 b171b29ba637bff5578707d84a5c17dc
SHA1 f96a9e63a88217094a2ad957fb69721889fb532a
SHA512 004de217c06117da7c991ae16b7c942e93ff222ef9bd535569c49facf81dbb111e73be514597b4a85d00a30e7a3e81dea5dd180d444ba15123515cfe0aeaf5f5
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwp+:2Ly2Kerc64CiGIm1K851YO6EQkwp+
TLSH
T1BF93A1763A259190C48BD138E8155AA0B932DCF52FF71303E7417AAC59B1E13CFAE8C6
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/5888-0-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/files/0x000800000001b871-5.dat	family_juko
behavioral2/memory/5888-9-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/3168-12-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/files/0x000f00000001c467-13.dat	family_juko
behavioral2/memory/4144-15-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/4144-16-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
3168	WINWORD.exe
4144	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
5316	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	2026-08-13_b171b29ba637bff5578707d84a5c17dc_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
4536	PING.EXE
6132	PING.EXE
5316	cmd.exe
5852	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
5852	PING.EXE
4536	PING.EXE
6132	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5888 wrote to memory of 3168	5888	2026-08-13_b171b29ba637bff5578707d84a5c17dc_elex_wannacry.exe	89
PID 3168 wrote to memory of 5316	3168	WINWORD.exe	90
PID 5316 wrote to memory of 5852	5316	cmd.exe	92
PID 5316 wrote to memory of 4536	5316	cmd.exe	93
PID 5316 wrote to memory of 6132	5316	cmd.exe	94
PID 5316 wrote to memory of 4144	5316	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-13_b171b29ba637bff5578707d84a5c17dc_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-13_b171b29ba637bff5578707d84a5c17dc_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5888
- 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:3168
- - 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\00006D07" 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:5316
  - - 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:5852
  - - 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:4536
  - - 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:6132
  - - 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:4144

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

00006D07

Path C:\Users\Admin\AppData\Roaming\Mozilla\00006D07
Size 87KB
SHA256 53292226de4e91d1cc4f44fe186e1dd99ad5021c68e6e10b9241250a616c838e
MD5 1a5337ab3bd7a6ccda04025655ea01c9
SHA1 b78ec8ce859cf41f09fbc56ddfe7945cff9e637e
SHA512 4cd3bcdcd595b0a3baa3453dd9fbfd5e704cf60bf0df6dc0dd277b849b03b35cb7784caf3b8937bdd56219e16042e4464d1c028ab50d2b870005bf1dfd410981
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpT:2Ly2Kerc64CiGIm1K851YO6EQkwpT
TLSH
T15B93A1763A259190C48BD178E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 87KB
SHA256 62c5f27cf05396c42439e5ca2652efce47d66095c49543d23640b373bf336ec5
MD5 b171b29ba637bff5578707d84a5c17dc
SHA1 f96a9e63a88217094a2ad957fb69721889fb532a
SHA512 004de217c06117da7c991ae16b7c942e93ff222ef9bd535569c49facf81dbb111e73be514597b4a85d00a30e7a3e81dea5dd180d444ba15123515cfe0aeaf5f5
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwp+:2Ly2Kerc64CiGIm1K851YO6EQkwp+
TLSH
T1BF93A1763A259190C48BD138E8155AA0B932DCF52FF71303E7417AAC59B1E13CFAE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/3168-12-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/4144-15-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/4144-16-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/5888-0-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/5888-9-0x0000000000400000-0x0000000000425000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads