juko | bb0d7e017af47e73df7b6ee91df8a745c190e44c502496b68e02e3aafc6dd791

General

Target
2026-08-09_70cede138c89a7a59c0193e23bc8c1ed_elex_wannacry.exe
Size 49KB
Sample260809-ep5ryszekf
SHA256 bb0d7e017af47e73df7b6ee91df8a745c190e44c502496b68e02e3aafc6dd791
MD5 70cede138c89a7a59c0193e23bc8c1ed
SHA1 714851d5219724013f9f35d4a847fc5e04bab058
SHA512 f650dbecfa7c738f2aa23b895a268618495dfb927fdc6245b38abf4c8854c87a80524577c6f1415a22dbce92c10615e7e20e1ac88dbcf660347aae421558bc6c
SSDEEP 1536:4LsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2F:4Ly2Kerc64CiGImVu8p4kojWh2F
TLSH
T171334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
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/4956-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x00170000000115f5-5.dat	family_juko
behavioral2/memory/4956-10-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/4720-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000e00000001c4d7-13.dat	family_juko
behavioral2/memory/1756-15-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/1756-16-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4720	WINWORD.exe
1756	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-1-5-21-3797332335-34111092-3597280141-1000\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
5808	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	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-08-09_70cede138c89a7a59c0193e23bc8c1ed_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

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
2672	PING.EXE
5808	cmd.exe
4868	PING.EXE
4976	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4868	PING.EXE
4976	PING.EXE
2672	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4956 wrote to memory of 4720	4956	2026-08-09_70cede138c89a7a59c0193e23bc8c1ed_elex_wannacry.exe	89
PID 4720 wrote to memory of 5808	4720	WINWORD.exe	90
PID 5808 wrote to memory of 4868	5808	cmd.exe	92
PID 5808 wrote to memory of 4976	5808	cmd.exe	93
PID 5808 wrote to memory of 2672	5808	cmd.exe	94
PID 5808 wrote to memory of 1756	5808	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-09_70cede138c89a7a59c0193e23bc8c1ed_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-09_70cede138c89a7a59c0193e23bc8c1ed_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4956
- 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:4720
- - 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\000004E7" 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:5808
  - - 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:4868
  - - 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:4976
  - - 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:2672
  - - 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:1756

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

Replay Monitor

Loading Replay Monitor...

Downloads

000004E7

Path C:\Users\Admin\AppData\Roaming\Mozilla\000004E7
Size 49KB
SHA256 7c2e5adf2e3b945d57bccd1a2c0ab8df6e353e275df85f0b0b3a2e3d8f0de85d
MD5 65373f3469e9b07a23e8dabbdf28c192
SHA1 e9bdb952be4bff2759b5f00d5bca18eecb3de465
SHA512 a7974cc7007b633ddcd0be794579ba7f280f0b386d5e8fdc9701fc3741bc0574fc4d31c042f81696b29edd1069afd9ef25f7551914dc9a425e1e9d241c75709a
SSDEEP 1536:4LsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h20:4Ly2Kerc64CiGImVu8p4kojWh20
TLSH
T198334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 49KB
SHA256 bb0d7e017af47e73df7b6ee91df8a745c190e44c502496b68e02e3aafc6dd791
MD5 70cede138c89a7a59c0193e23bc8c1ed
SHA1 714851d5219724013f9f35d4a847fc5e04bab058
SHA512 f650dbecfa7c738f2aa23b895a268618495dfb927fdc6245b38abf4c8854c87a80524577c6f1415a22dbce92c10615e7e20e1ac88dbcf660347aae421558bc6c
SSDEEP 1536:4LsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2F:4Ly2Kerc64CiGImVu8p4kojWh2F
TLSH
T171334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1756-15-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/1756-16-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4720-12-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4956-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4956-10-0x0000000000400000-0x0000000000420000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

Replay Monitor

Loading Replay Monitor...

Downloads