juko | 8c1971fd72396ec9d2e9eb057eb0df7536fc1e697d02e030cc0ce3d8173e1207

General

Target
2026-07-01_b0c2caec0bac9b1381ba35f257c040ac_elex_wannacry.exe
Size 87KB
Sample260701-b6rd4sdz7v
SHA256 8c1971fd72396ec9d2e9eb057eb0df7536fc1e697d02e030cc0ce3d8173e1207
MD5 b0c2caec0bac9b1381ba35f257c040ac
SHA1 bdf649716a7811922f4cbe78607b6106d2f676d9
SHA512 276128c807c32dcfb8470f3c6267d43b788978f46983fa70f1f2b02a6d99f1a7e586cafd5a6e0cf951c96c5b5740881e5980c2c60b4bfc387be0824f90585983
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpy:2Ly2Kerc64CiGIm1K851YO6EQkwpy
TLSH
T11793A1763A259190C48BD178E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

discovery 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/6068-0-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/files/0x000e0000000113bc-5.dat	family_juko
behavioral2/memory/6068-9-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/2884-12-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/files/0x000e00000001c52b-13.dat	family_juko
behavioral2/memory/3144-15-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/3144-16-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
2884	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-1-5-21-2900715619-172032027-1873877232-1000\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

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	2026-07-01_b0c2caec0bac9b1381ba35f257c040ac_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
5636	cmd.exe
2820	PING.EXE
4436	PING.EXE
2740	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2820	PING.EXE
4436	PING.EXE
2740	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 6068 wrote to memory of 2884	6068	2026-07-01_b0c2caec0bac9b1381ba35f257c040ac_elex_wannacry.exe	89
PID 2884 wrote to memory of 5636	2884	WINWORD.exe	90
PID 5636 wrote to memory of 2820	5636	cmd.exe	92
PID 5636 wrote to memory of 4436	5636	cmd.exe	93
PID 5636 wrote to memory of 2740	5636	cmd.exe	94
PID 5636 wrote to memory of 3144	5636	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-07-01_b0c2caec0bac9b1381ba35f257c040ac_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-01_b0c2caec0bac9b1381ba35f257c040ac_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:6068
- 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:2884
- - 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\000050CE" WINWORD.exe&ping 127.0.0.1 -n 2&"C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" \r
    3⤵
    - System Location Discovery: System Language Discovery
    - System Network Configuration Discovery: Internet Connection Discovery
    - Suspicious use of WriteProcessMemory
    PID:5636
  - - 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:2820
  - - 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:4436
  - - 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:2740
  - - 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

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

000050CE

Path C:\Users\Admin\AppData\Roaming\Mozilla\000050CE
Size 87KB
SHA256 c5c4fcaa2ad01877aa81cb07b2a7593ea9f21619ba728c7bc632676b666db954
MD5 dfc234cb2c725574a2849780df6c3936
SHA1 2345a71d8fbea6e09c8a57e497c1024e3272e6e1
SHA512 3717dd098703cb11610c348b94952d62d4366a50f44d6a7a0befb018e1360f6942315ed648ae0e25932418e119b48d1f13661c634ac33e72fab49504fea80b27
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwp9:2Ly2Kerc64CiGIm1K851YO6EQkwp9
TLSH
T1A393A1763A259190C48BD138E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 87KB
SHA256 8c1971fd72396ec9d2e9eb057eb0df7536fc1e697d02e030cc0ce3d8173e1207
MD5 b0c2caec0bac9b1381ba35f257c040ac
SHA1 bdf649716a7811922f4cbe78607b6106d2f676d9
SHA512 276128c807c32dcfb8470f3c6267d43b788978f46983fa70f1f2b02a6d99f1a7e586cafd5a6e0cf951c96c5b5740881e5980c2c60b4bfc387be0824f90585983
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpy:2Ly2Kerc64CiGIm1K851YO6EQkwpy
TLSH
T11793A1763A259190C48BD178E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2884-12-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/3144-15-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/3144-16-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/6068-0-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/6068-9-0x0000000000400000-0x0000000000425000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads