juko | 2ab2c97e8393c69ab2b2114a0f3c654894d99c1ea796ef0d15001d987d6217a1

General

Target
2026-06-02_fab27d64746c6491c9955d788b2bf6c7_elex_wannacry.exe
Size 95KB
Sample260602-dht67sct7z
SHA256 2ab2c97e8393c69ab2b2114a0f3c654894d99c1ea796ef0d15001d987d6217a1
MD5 fab27d64746c6491c9955d788b2bf6c7
SHA1 4ee97a41e9f8e93ebd336c5ea324cc258f93a592
SHA512 819196817f6c8040e0f4bbee1c7982af4bad6b9b451ff284dca5008b5cc5835db7b8c07c0fa17d5835e2481bbfde8f80af976f125cc48b331c29a3798108e831
SSDEEP 1536:JLsF2Kerc64sTiX2IV0DXJrdShIPoANJLlAXuSXv+qSFEAeOFNe:JLy2Kerc64CiGIm7JrshIPFJRAhP2EAC
TLSH
T13993CF167B986052D88A0470CA7F4F3584397C791426E213B3D27A1F2DB2A52EF73ADD
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/4116-0-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral2/files/0x000700000002aa5f-5.dat	family_juko
behavioral2/memory/4116-11-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral2/memory/1392-14-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral2/files/0x001d00000002b376-15.dat	family_juko
behavioral2/memory/1208-17-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral2/memory/1208-18-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
1392	WINWORD.exe
1208	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	2026-06-02_fab27d64746c6491c9955d788b2bf6c7_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
772	cmd.exe
996	PING.EXE
2224	PING.EXE
668	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
996	PING.EXE
2224	PING.EXE
668	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4116 wrote to memory of 1392	4116	2026-06-02_fab27d64746c6491c9955d788b2bf6c7_elex_wannacry.exe	82
PID 1392 wrote to memory of 772	1392	WINWORD.exe	83
PID 772 wrote to memory of 996	772	cmd.exe	85
PID 772 wrote to memory of 2224	772	cmd.exe	86
PID 772 wrote to memory of 668	772	cmd.exe	87
PID 772 wrote to memory of 1208	772	cmd.exe	88

C:\Users\Admin\AppData\Local\Temp\2026-06-02_fab27d64746c6491c9955d788b2bf6c7_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-06-02_fab27d64746c6491c9955d788b2bf6c7_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:1392
- - 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\00003B6F" 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:772
  - - 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:\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:2224
  - - 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:668
  - - 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:1208

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

Replay Monitor

Loading Replay Monitor...

Downloads

00003B6F

Path C:\Users\Admin\AppData\Roaming\Mozilla\00003B6F
Size 95KB
SHA256 196aafb73ddb2d103b8fcf1a374695cab16c41c8402eb9ddcf97bb071b9123ee
MD5 bf850526bae71a6b62bd5b658f6eece9
SHA1 cccff828409c51b9e3efeaee54fcea00eadad805
SHA512 e7d6e0f83b4b4df9a4a6e92fc8361ab617609f25319dcbcf8a131a2db75c6c3a46ea5a2fdc3ab04e5918e8b1a45250b26c4a3b3a5d65f243277b06bda1ea4e8d
SSDEEP 1536:JLsF2Kerc64sTiX2IV0DXJrdShIPoANJLlAXuSXv+qSFEAeOFNA:JLy2Kerc64CiGIm7JrshIPFJRAhP2EA0
TLSH
T11593CF167B986052D88A0470CA7F4F3584397C791426E213B3D27A1F2DB2A52EF73ADD
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 95KB
SHA256 2ab2c97e8393c69ab2b2114a0f3c654894d99c1ea796ef0d15001d987d6217a1
MD5 fab27d64746c6491c9955d788b2bf6c7
SHA1 4ee97a41e9f8e93ebd336c5ea324cc258f93a592
SHA512 819196817f6c8040e0f4bbee1c7982af4bad6b9b451ff284dca5008b5cc5835db7b8c07c0fa17d5835e2481bbfde8f80af976f125cc48b331c29a3798108e831
SSDEEP 1536:JLsF2Kerc64sTiX2IV0DXJrdShIPoANJLlAXuSXv+qSFEAeOFNe:JLy2Kerc64CiGIm7JrshIPFJRAhP2EAC
TLSH
T13993CF167B986052D88A0470CA7F4F3584397C791426E213B3D27A1F2DB2A52EF73ADD
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1208-17-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/1208-18-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/1392-14-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/4116-0-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/4116-11-0x0000000000400000-0x000000000042B000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

Replay Monitor

Loading Replay Monitor...

Downloads