juko | 66c3f97a8916505742b46514c8e4d0c0c0aae6a85812685177e195b5a115225c

General

Target
2026-05-27_46bc16d3c775c5cecea0dadf712fca8c_elex_wannacry.exe
Size 49KB
Sample260527-e4vwase18p
SHA256 66c3f97a8916505742b46514c8e4d0c0c0aae6a85812685177e195b5a115225c
MD5 46bc16d3c775c5cecea0dadf712fca8c
SHA1 ee2ff821bf0bcea5228205e0e16023eeec5d0d1b
SHA512 84f96bbff8ef90f452cac4c144296a1ffcf1cb54f40a9232c599ef0a12334bc9f3c9c3fd73c6079a2f1ac76b95a4f3879809d18eebf1339a9d715d7a89a0f471
SSDEEP 1536:VLsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2T:VLy2Kerc64CiGImVu8p4kojWh2T
TLSH
T191334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
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/2672-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x002000000002b2e0-5.dat	family_juko
behavioral2/memory/2672-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/4192-14-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x001b00000002b4ee-15.dat	family_juko
behavioral2/memory/3356-17-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/3356-18-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4192	WINWORD.exe
3356	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-1-5-21-2654269261-3199571979-4291878722-1000\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	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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-05-27_46bc16d3c775c5cecea0dadf712fca8c_elex_wannacry.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
4000	cmd.exe
4808	PING.EXE
3288	PING.EXE
3204	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4808	PING.EXE
3288	PING.EXE
3204	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2672 wrote to memory of 4192	2672	2026-05-27_46bc16d3c775c5cecea0dadf712fca8c_elex_wannacry.exe	81
PID 4192 wrote to memory of 4000	4192	WINWORD.exe	82
PID 4000 wrote to memory of 4808	4000	cmd.exe	84
PID 4000 wrote to memory of 3288	4000	cmd.exe	85
PID 4000 wrote to memory of 3204	4000	cmd.exe	86
PID 4000 wrote to memory of 3356	4000	cmd.exe	87

C:\Users\Admin\AppData\Local\Temp\2026-05-27_46bc16d3c775c5cecea0dadf712fca8c_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-27_46bc16d3c775c5cecea0dadf712fca8c_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2672
- 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:4192
- - 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\00002805" 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:4000
  - - 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:4808
  - - 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:3288
  - - 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:3204
  - - 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:3356

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

00002805

Path C:\Users\Admin\AppData\Roaming\Mozilla\00002805
Size 49KB
SHA256 4ed01a0aaf588411297b0c271a952d7a4b25a4b49e1694a181022a51a3425b20
MD5 1f85eefab2f6688fa7c2da3c90be0c7c
SHA1 a1dc3d2089601146a1ead40644cb079cb9faa9db
SHA512 cc1f0434ea623ac76de93c908e63a19d8019f0c3c3ab57df41c32a527462fea203c8f76cdd7a5f70730b7c8453f32d2b3119f6275b50b1c5d42a0cca50dfbbdc
SSDEEP 1536:VLsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2c:VLy2Kerc64CiGImVu8p4kojWh2c
TLSH
T142334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 49KB
SHA256 66c3f97a8916505742b46514c8e4d0c0c0aae6a85812685177e195b5a115225c
MD5 46bc16d3c775c5cecea0dadf712fca8c
SHA1 ee2ff821bf0bcea5228205e0e16023eeec5d0d1b
SHA512 84f96bbff8ef90f452cac4c144296a1ffcf1cb54f40a9232c599ef0a12334bc9f3c9c3fd73c6079a2f1ac76b95a4f3879809d18eebf1339a9d715d7a89a0f471
SSDEEP 1536:VLsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2T:VLy2Kerc64CiGImVu8p4kojWh2T
TLSH
T191334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2672-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/2672-12-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/3356-17-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/3356-18-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4192-14-0x0000000000400000-0x0000000000420000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads