juko | 74eacc15f73002edfe9c4887392fe828c6e3c6734df00860d966cbc9032af4e7

General

Target
2026-05-17_9c8034c93e8eea2215485b5bf9cb01bc_elex_wannacry.exe
Size 57KB
Sample260517-s9blhaev2m
SHA256 74eacc15f73002edfe9c4887392fe828c6e3c6734df00860d966cbc9032af4e7
MD5 9c8034c93e8eea2215485b5bf9cb01bc
SHA1 6f976b02c513a94e7636136c1890d23ed78d2e70
SHA512 941ea4ef773af28b4af7d1edfcb5aeeff2ed0c259fd93387826c824c8c1fcc02049974d59dc3a452886f5f911cec2ff6a4a5045db4d88de8b739a41ecfef1993
SSDEEP 1536:qLsF2Kerc64sTiX2IV0DYlNpyyCwlAY0VdTQO:qLy2Kerc64CiGImklNUyp8TB
TLSH
T19F433C16B950B072D99220B06A6D6B36417A9DF10317A1D3E7407ADD68F2FD2EF306CE
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/1856-0-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/files/0x000c000000028ec9-5.dat	family_juko
behavioral2/memory/1856-12-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/memory/3536-14-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/files/0x001c00000002b751-15.dat	family_juko
behavioral2/memory/5320-17-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/memory/5320-18-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
3536	WINWORD.exe
5320	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-1-5-21-1768642833-2142038154-4041560723-1000\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	2026-05-17_9c8034c93e8eea2215485b5bf9cb01bc_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
5816	cmd.exe
2520	PING.EXE
5900	PING.EXE
996	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2520	PING.EXE
5900	PING.EXE
996	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1856 wrote to memory of 3536	1856	2026-05-17_9c8034c93e8eea2215485b5bf9cb01bc_elex_wannacry.exe	80
PID 3536 wrote to memory of 5816	3536	WINWORD.exe	81
PID 5816 wrote to memory of 2520	5816	cmd.exe	83
PID 5816 wrote to memory of 5900	5816	cmd.exe	84
PID 5816 wrote to memory of 996	5816	cmd.exe	85
PID 5816 wrote to memory of 5320	5816	cmd.exe	86

C:\Users\Admin\AppData\Local\Temp\2026-05-17_9c8034c93e8eea2215485b5bf9cb01bc_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-17_9c8034c93e8eea2215485b5bf9cb01bc_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1856
- 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:3536
- - 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\000038CD" 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:5816
  - - 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:2520
  - - 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:5900
  - - 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:996
  - - 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:5320

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

000038CD

Path C:\Users\Admin\AppData\Roaming\Mozilla\000038CD
Size 57KB
SHA256 8800275f9c8cd15b3f8f1c0966f80ff1a21657a5582b9b525dae9587393e73ec
MD5 bc7d5cad03ee5eeff0ea6152498881f1
SHA1 9f88e3832f735cc2c7b87e057f3c9b6ac2ca363b
SHA512 6c93db3d689324cb5f0972a419d7d3249a6ab30a2437ed32038c6136746642db5555cf269ca27a8f0441be52fa067b977d5607a6172c7085083b98c4570a797c
SSDEEP 1536:qLsF2Kerc64sTiX2IV0DYlNpyyCwlAY0VdTQ/:qLy2Kerc64CiGImklNUyp8T4
TLSH
T129433C16B950B072D99220B06A6D6B36417A9DF10317A1D3E7407ADD68F2FD2EF306CE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 57KB
SHA256 74eacc15f73002edfe9c4887392fe828c6e3c6734df00860d966cbc9032af4e7
MD5 9c8034c93e8eea2215485b5bf9cb01bc
SHA1 6f976b02c513a94e7636136c1890d23ed78d2e70
SHA512 941ea4ef773af28b4af7d1edfcb5aeeff2ed0c259fd93387826c824c8c1fcc02049974d59dc3a452886f5f911cec2ff6a4a5045db4d88de8b739a41ecfef1993
SSDEEP 1536:qLsF2Kerc64sTiX2IV0DYlNpyyCwlAY0VdTQO:qLy2Kerc64CiGImklNUyp8TB
TLSH
T19F433C16B950B072D99220B06A6D6B36417A9DF10317A1D3E7407ADD68F2FD2EF306CE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1856-0-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/1856-12-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/3536-14-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/5320-17-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/5320-18-0x0000000000400000-0x0000000000422000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads