juko | 1cd5b148b4d81c436faa70e4f32786b912315fa77956c669ec6b164fc0b01c84

General

Target
2026-10-21_9418a2655719cb7a8f78e9c3bf80a4e0_elex_wannacry.exe
Size 34KB
Sample261022-vf7sysgt2k
SHA256 1cd5b148b4d81c436faa70e4f32786b912315fa77956c669ec6b164fc0b01c84
MD5 9418a2655719cb7a8f78e9c3bf80a4e0
SHA1 faef6d20d18d9451c62dcbfcf47a2482c7d3cbd6
SHA512 0694871a1bad593428d805c1501ee0f1c6b32c04170777cd092a7d1067f3bf840e563166155282c07d1267dbaa6785291e035c20ddab8c69097fdad951d311c9
SSDEEP 768:qZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHp+7mpf:OLsF2Kerc64sTiX2IV0Dhu+76f
TLSH
T13EF2292F29927052C59250B0E9DC2F70847D9CB6116BB166EB41BB692CB2C63CF719CE
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 2 IoCs

resource	yara_rule
behavioral2/files/0x000a00000001b87a-3.dat	family_juko
behavioral2/files/0x000e00000001c578-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4300	WINWORD.exe
5364	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-1-5-21-4280978039-528710165-233981602-1000\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
4696	cmd.exe

Reads the TCP/IP host and domain name from the registry 1 TTPs 2 IoCs

The configured hostname and DNS domain identify the machine and are commonly collected to profile a host before it reports in.

discovery

System Network Configuration Discovery

T1016

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Hostname	WINWORD.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Domain	WINWORD.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	2026-10-21_9418a2655719cb7a8f78e9c3bf80a4e0_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
4696	cmd.exe
5436	PING.EXE
4100	PING.EXE
4352	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
5436	PING.EXE
4100	PING.EXE
4352	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2188 wrote to memory of 4300	2188	2026-10-21_9418a2655719cb7a8f78e9c3bf80a4e0_elex_wannacry.exe	89
PID 4300 wrote to memory of 4696	4300	WINWORD.exe	90
PID 4696 wrote to memory of 5436	4696	cmd.exe	92
PID 4696 wrote to memory of 4100	4696	cmd.exe	93
PID 4696 wrote to memory of 4352	4696	cmd.exe	94
PID 4696 wrote to memory of 5364	4696	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-10-21_9418a2655719cb7a8f78e9c3bf80a4e0_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-10-21_9418a2655719cb7a8f78e9c3bf80a4e0_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2188
- 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:4300
- - 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\00005407" 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:4696
  - - 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:5436
  - - 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:4100
  - - 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:4352
  - - 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
      Reads the TCP/IP host and domain name from the registry
      System Location Discovery: System Language Discovery
      PID:5364

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

2

T1016

Internet Connection Discovery

1

T1016.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

00005407

Path C:\Users\Admin\AppData\Roaming\Mozilla\00005407
Size 34KB
SHA256 2170884cb9c5abddccc5228adb5de79d320f4bf31864954913487255cf19ce0b
MD5 06268331f61fd9f9101aacd882e828bb
SHA1 5490ce7e5a9d71da35b3e75c2fc848d434e84850
SHA512 53c43a8115bf0a3ec0156e17d18beaff69241ffa3dc2cd7e2876ede244464863c30fc002d78c933249a1a5852df41c88a1623b940c00bdd34debd2ad76850944
SSDEEP 768:qZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHp+7mp5:OLsF2Kerc64sTiX2IV0Dhu+765
TLSH
T1C6F2292F29927052C59250B0E9DC2F70847D9CB6116BB166EB41BB692CB2C63CF719CE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 34KB
SHA256 1cd5b148b4d81c436faa70e4f32786b912315fa77956c669ec6b164fc0b01c84
MD5 9418a2655719cb7a8f78e9c3bf80a4e0
SHA1 faef6d20d18d9451c62dcbfcf47a2482c7d3cbd6
SHA512 0694871a1bad593428d805c1501ee0f1c6b32c04170777cd092a7d1067f3bf840e563166155282c07d1267dbaa6785291e035c20ddab8c69097fdad951d311c9
SSDEEP 768:qZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqKNPWQHp+7mpf:OLsF2Kerc64sTiX2IV0Dhu+76f
TLSH
T13EF2292F29927052C59250B0E9DC2F70847D9CB6116BB166EB41BB692CB2C63CF719CE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads