juko | 94622203d84a42e6a2ae71e07be1ca0395b451777b235a56da394bf3d2aac386

General

Target
2026-07-28_077ded86d7833637d24f1aa28f37acf5_elex_wannacry.exe
Size 87KB
Sample260728-xxvk3afq21
SHA256 94622203d84a42e6a2ae71e07be1ca0395b451777b235a56da394bf3d2aac386
MD5 077ded86d7833637d24f1aa28f37acf5
SHA1 39ec821dd1bf493c756a366fba245bea7b805ac6
SHA512 cf9fa6e1668cb8389d7449f61f588504ef0e52f5cc5f6a5db3706f1d6f0105ff88d9953c79f7f2f00957e27409a59d30c6f1e27034af3c8d9125db177c5f685f
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwp3:2Ly2Kerc64CiGIm1K851YO6EQkwp3
TLSH
T15D93A1763A259190C48BD178E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
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 8 IoCs

resource	yara_rule
behavioral2/memory/4336-0-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/files/0x000b000000016ced-5.dat	family_juko
behavioral2/memory/5452-9-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/4336-10-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/5452-13-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/files/0x000e00000001c564-14.dat	family_juko
behavioral2/memory/1936-16-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/1936-17-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
5452	WINWORD.exe
1936	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-1-5-21-2115213192-531537726-3295841909-1000\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
2852	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	2026-07-28_077ded86d7833637d24f1aa28f37acf5_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
2852	cmd.exe
1712	PING.EXE
3488	PING.EXE
4412	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
1712	PING.EXE
3488	PING.EXE
4412	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4336 wrote to memory of 5452	4336	2026-07-28_077ded86d7833637d24f1aa28f37acf5_elex_wannacry.exe	89
PID 5452 wrote to memory of 2852	5452	WINWORD.exe	90
PID 2852 wrote to memory of 1712	2852	cmd.exe	92
PID 2852 wrote to memory of 3488	2852	cmd.exe	93
PID 2852 wrote to memory of 4412	2852	cmd.exe	94
PID 2852 wrote to memory of 1936	2852	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-07-28_077ded86d7833637d24f1aa28f37acf5_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-28_077ded86d7833637d24f1aa28f37acf5_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4336
- 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:5452
- - 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\0000671E" 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:2852
  - - 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:1712
  - - 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:3488
  - - 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:4412
  - - 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:1936

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

0000671E

Path C:\Users\Admin\AppData\Roaming\Mozilla\0000671E
Size 87KB
SHA256 9da08be22caab01a984f555336bed13ef0ac42f2794a8ef40aa35384bdbaca7c
MD5 ebfb03da0a6a975184b67221ce677d09
SHA1 23efe7c70d39eaf0c5598581b24d205cc7f95055
SHA512 c94fbac034c232f410cfb23b0f817d0778b0ae11f800d0db252a22ea01f70d09944a791277fc269739b123d27d2ec5ff289399a1703546fc3e035dc0932fe777
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpo:2Ly2Kerc64CiGIm1K851YO6EQkwpo
TLSH
T1BB93A1763A259190C48BD178E8155AA0B932DCF52FF71303E7417AAC59B1E13CFAE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 87KB
SHA256 94622203d84a42e6a2ae71e07be1ca0395b451777b235a56da394bf3d2aac386
MD5 077ded86d7833637d24f1aa28f37acf5
SHA1 39ec821dd1bf493c756a366fba245bea7b805ac6
SHA512 cf9fa6e1668cb8389d7449f61f588504ef0e52f5cc5f6a5db3706f1d6f0105ff88d9953c79f7f2f00957e27409a59d30c6f1e27034af3c8d9125db177c5f685f
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwp3:2Ly2Kerc64CiGIm1K851YO6EQkwp3
TLSH
T15D93A1763A259190C48BD178E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1936-16-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/1936-17-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/4336-0-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/4336-10-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/5452-9-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/5452-13-0x0000000000400000-0x0000000000425000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads