juko | 5de67c2c0a8656dbdbd9d3ef0c2a2d3421a2531b9677467ad49f2bbecf471b22

General

Target
2026-08-01_476f42ae35ab3c7df63c8257065a464b_elex_wannacry.exe
Size 37KB
Sample260801-fxv36aem2x
SHA256 5de67c2c0a8656dbdbd9d3ef0c2a2d3421a2531b9677467ad49f2bbecf471b22
MD5 476f42ae35ab3c7df63c8257065a464b
SHA1 244532241f94a81bcd9db3ccdec05ab514f4f301
SHA512 850051a28338da9527bad23a2826705b3475b400e4bd6001166eeca7c1f6f27a11e0afd53cf2ac3d0a278b63b0cd12893906f713fca7d9fc8822fdcab99070d7
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpZa5ywab:3LsF2Kerc64sTiX2IV0Dhuogw4
TLSH
T125034C1A299160A2D55310B0E9D81FB4C53D8CB6106BB062F740BE59A8B3CD7DF72BCE
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/3396-0-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x000b000000011371-5.dat	family_juko
behavioral2/memory/3396-9-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/2148-12-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/files/0x000e00000001c5ed-13.dat	family_juko
behavioral2/memory/4672-15-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral2/memory/4672-16-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
2148	WINWORD.exe
4672	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-1-5-21-4046655672-1449839301-2197395821-1000\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
5028	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	2026-08-01_476f42ae35ab3c7df63c8257065a464b_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
5940	PING.EXE
5488	PING.EXE
1220	PING.EXE
5028	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
5940	PING.EXE
5488	PING.EXE
1220	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3396 wrote to memory of 2148	3396	2026-08-01_476f42ae35ab3c7df63c8257065a464b_elex_wannacry.exe	89
PID 2148 wrote to memory of 5028	2148	WINWORD.exe	90
PID 5028 wrote to memory of 5940	5028	cmd.exe	92
PID 5028 wrote to memory of 5488	5028	cmd.exe	93
PID 5028 wrote to memory of 1220	5028	cmd.exe	94
PID 5028 wrote to memory of 4672	5028	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-01_476f42ae35ab3c7df63c8257065a464b_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-01_476f42ae35ab3c7df63c8257065a464b_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3396
- 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:2148
- - 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\0000334E" 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:5028
  - - 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:5940
  - - 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:5488
  - - 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:1220
  - - 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:4672

C:\Windows\system32\svchost.exe
C:\Windows\system32\svchost.exe -k GPSvcGroup
1⤵
PID:3736

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

0000334E

Path C:\Users\Admin\AppData\Roaming\Mozilla\0000334E
Size 37KB
SHA256 940e0edab1f1a19e6145e27ed9412b03d065b256bd5310559b15aca3aeaba872
MD5 20fa01a19afd2804423f96c7a242cc9f
SHA1 efdc2f6c98aacdcfe256b29473bf813144cb4380
SHA512 a6d3178053c3c4baf44b7ee1bfbb2f2a62763fc4843607b96f5047112e3460b6dfb61c43e2acbcb0bec8a384bdb636a71e5f2b71d7395c54d12cb587777f6276
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpZa5ywaU:3LsF2Kerc64sTiX2IV0DhuogwT
TLSH
T127035C1A299160A2D55310B0E9D82FB4C53D8C76106BB062F740BE59A8B3CD7DF72BCE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 37KB
SHA256 5de67c2c0a8656dbdbd9d3ef0c2a2d3421a2531b9677467ad49f2bbecf471b22
MD5 476f42ae35ab3c7df63c8257065a464b
SHA1 244532241f94a81bcd9db3ccdec05ab514f4f301
SHA512 850051a28338da9527bad23a2826705b3475b400e4bd6001166eeca7c1f6f27a11e0afd53cf2ac3d0a278b63b0cd12893906f713fca7d9fc8822fdcab99070d7
SSDEEP 768:FZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHpZa5ywab:3LsF2Kerc64sTiX2IV0Dhuogw4
TLSH
T125034C1A299160A2D55310B0E9D81FB4C53D8CB6106BB062F740BE59A8B3CD7DF72BCE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2148-12-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/3396-0-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/3396-9-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4672-15-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4672-16-0x0000000000400000-0x000000000041D000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

Replay Monitor

Loading Replay Monitor...

Downloads