juko | acf52875d7ae109484773ddbb131cfee8ba85bc4a0392c12442a046a6adcbbb9

General

Target
2026-05-29_326b5e8e488f9aa0ee34bed8c651f8ad_elex_wannacry.exe
Size 49KB
Sample260529-g7a2eaet2z
SHA256 acf52875d7ae109484773ddbb131cfee8ba85bc4a0392c12442a046a6adcbbb9
MD5 326b5e8e488f9aa0ee34bed8c651f8ad
SHA1 d1e16acf5bc4cc278af03545579aba5abdee1600
SHA512 3ee5e818f7d44857c286b46966a323baa0c7fead206b905e8aba32950c19fab1d3962e67f67fbf710b2ed7420e0f41345b8e07102b8d7487928eb7a5c7c812b9
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h23:VLy2Kerc64CiGImVucp4kojWh23
TLSH
T1A8334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
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/4116-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x000700000002aa5f-5.dat	family_juko
behavioral2/memory/4116-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/1088-14-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x001d00000002b376-15.dat	family_juko
behavioral2/memory/1636-17-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/1636-18-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
1088	WINWORD.exe
1636	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-1-5-21-1679180529-4058988202-686829476-1000\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	2026-05-29_326b5e8e488f9aa0ee34bed8c651f8ad_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

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
3360	PING.EXE
4912	PING.EXE
1228	cmd.exe
3748	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3748	PING.EXE
3360	PING.EXE
4912	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4116 wrote to memory of 1088	4116	2026-05-29_326b5e8e488f9aa0ee34bed8c651f8ad_elex_wannacry.exe	82
PID 1088 wrote to memory of 1228	1088	WINWORD.exe	83
PID 1228 wrote to memory of 3748	1228	cmd.exe	85
PID 1228 wrote to memory of 3360	1228	cmd.exe	86
PID 1228 wrote to memory of 4912	1228	cmd.exe	87
PID 1228 wrote to memory of 1636	1228	cmd.exe	88

C:\Users\Admin\AppData\Local\Temp\2026-05-29_326b5e8e488f9aa0ee34bed8c651f8ad_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-29_326b5e8e488f9aa0ee34bed8c651f8ad_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4116
- 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:1088
- - 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\00003443" 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:1228
  - - 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:3748
  - - 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:3360
  - - 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:4912
  - - 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:1636

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

00003443

Path C:\Users\Admin\AppData\Roaming\Mozilla\00003443
Size 49KB
SHA256 b7bda3f42cdbf9fc77cb6bcd0bf1cd1f9685281376b70a2ccba2a0f62d3cd780
MD5 3ca6065a37c050fad1bf9c5c735943e6
SHA1 43410238c7a676f9c562b213b8107ee441c2b9b2
SHA512 5f1a193a604edb0d1159dea6ccde15829ac7974f96eda4c1640e17541d1cfd3fa7d169450bb4852c791349a17ba5a8d1c722633a82359a0f8ea9f02a956cac28
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h29:VLy2Kerc64CiGImVucp4kojWh29
TLSH
T159334C0A3BD550C2D56205B0EDAA0F35833BEC391127A75EA780765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 49KB
SHA256 acf52875d7ae109484773ddbb131cfee8ba85bc4a0392c12442a046a6adcbbb9
MD5 326b5e8e488f9aa0ee34bed8c651f8ad
SHA1 d1e16acf5bc4cc278af03545579aba5abdee1600
SHA512 3ee5e818f7d44857c286b46966a323baa0c7fead206b905e8aba32950c19fab1d3962e67f67fbf710b2ed7420e0f41345b8e07102b8d7487928eb7a5c7c812b9
SSDEEP 1536:VLsF2Kerc64sTiX2IV0DhuD4p4kojVR6h23:VLy2Kerc64CiGImVucp4kojWh23
TLSH
T1A8334C0A3BD550C2D56205B0EDAA0F35933BEC391127A75EA780765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1088-14-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/1636-17-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/1636-18-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4116-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/4116-12-0x0000000000400000-0x0000000000420000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads