juko | 9fd8442afe1543aae497ff48c5a082bfa4c03067c8fc8120fa16b2eb0bf0ccab

General

Target
2026-10-22_4c200ac9f4c3bace9d7a43c9654e148d_elex_wannacry.exe
Size 87KB
Sample261024-rasv3aat4t
SHA256 9fd8442afe1543aae497ff48c5a082bfa4c03067c8fc8120fa16b2eb0bf0ccab
MD5 4c200ac9f4c3bace9d7a43c9654e148d
SHA1 1e78a2616a8aad8d7a3c8fb813db26901ce59c1b
SHA512 ea76c80c11bb4df27e130c482631e4bd876f133ff7c780bb3e87bcd35e054f1b43b1eee96eb75afb640a55a27a6fa168c536b95ee6b40569e4ce116e516ead26
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpK:2Ly2Kerc64CiGIm1K851YO6EQkwpK
TLSH
T1E993A1763A259190C48BD178E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
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/4156-0-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/files/0x000600000000053e-4.dat	family_juko
behavioral2/memory/4156-9-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/3492-12-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/files/0x0004000000000433-13.dat	family_juko
behavioral2/memory/4372-16-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/4372-17-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
3492	WINWORD.exe
4372	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-1-5-21-4154726816-2055034831-2297277433-1000\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
2468	cmd.exe

Reads the TCP/IP host and domain name from the registry 1 TTPs 2 IoCs

The configured hostname and DNS domain identify the machine and are commonly collected to profile a host before it reports in.

discovery

System Network Configuration Discovery

T1016

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Hostname	WINWORD.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Domain	WINWORD.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	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-10-22_4c200ac9f4c3bace9d7a43c9654e148d_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

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
4144	PING.EXE
1984	PING.EXE
2468	cmd.exe
3104	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3104	PING.EXE
4144	PING.EXE
1984	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4156 wrote to memory of 3492	4156	2026-10-22_4c200ac9f4c3bace9d7a43c9654e148d_elex_wannacry.exe	89
PID 3492 wrote to memory of 2468	3492	WINWORD.exe	90
PID 2468 wrote to memory of 3104	2468	cmd.exe	92
PID 2468 wrote to memory of 4144	2468	cmd.exe	93
PID 2468 wrote to memory of 1984	2468	cmd.exe	94
PID 2468 wrote to memory of 4372	2468	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-10-22_4c200ac9f4c3bace9d7a43c9654e148d_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-10-22_4c200ac9f4c3bace9d7a43c9654e148d_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4156
- 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:3492
- - 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\00001F03" 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:2468
  - - 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:3104
  - - 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:4144
  - - 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:1984
  - - 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
      Reads the TCP/IP host and domain name from the registry
      System Location Discovery: System Language Discovery
      PID:4372

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

2

T1016

Internet Connection Discovery

1

T1016.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

00001F03

Path C:\Users\Admin\AppData\Roaming\Mozilla\00001F03
Size 87KB
SHA256 8aa362354b9d37a2d7721d3d91d3a2fa72896bc5ba80c88e474af4383998f711
MD5 bc31ae14495376476b3380a280d2a702
SHA1 85bb1305472723ce789a7b903ae1bc43d69fb5cf
SHA512 238c9eadc749a8dc3bb3d5a01ad4f50a2d6e6b73c5c3a25132cef57798f4aa931801ab7ad6e32e03dcf7cf06bdcad62aa805dcaf3ceb71588f7055bf4834df03
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpL:2Ly2Kerc64CiGIm1K851YO6EQkwpL
TLSH
T1EA93A1763A259190C48BD178E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 87KB
SHA256 9fd8442afe1543aae497ff48c5a082bfa4c03067c8fc8120fa16b2eb0bf0ccab
MD5 4c200ac9f4c3bace9d7a43c9654e148d
SHA1 1e78a2616a8aad8d7a3c8fb813db26901ce59c1b
SHA512 ea76c80c11bb4df27e130c482631e4bd876f133ff7c780bb3e87bcd35e054f1b43b1eee96eb75afb640a55a27a6fa168c536b95ee6b40569e4ce116e516ead26
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpK:2Ly2Kerc64CiGIm1K851YO6EQkwpK
TLSH
T1E993A1763A259190C48BD178E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/3492-12-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/4156-0-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/4156-9-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/4372-16-0x0000000000400000-0x0000000000425000-memory.dmp

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memory/4372-17-0x0000000000400000-0x0000000000425000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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