juko | 819661ce09291bba04f89a49bfcaefea3d152e18d809200f059b8167e797578f

General

Target
2026-08-01_00842b3071b8325470786d20e1d94413_elex_wannacry.exe
Size 64KB
Sample260802-e1kwxsvbqg
SHA256 819661ce09291bba04f89a49bfcaefea3d152e18d809200f059b8167e797578f
MD5 00842b3071b8325470786d20e1d94413
SHA1 6f26e2c42840edd8e3440f75ea4d2aca08f8d60e
SHA512 c2bcfb2f988462835d04be2ee6e8ee529cd7313ce478b21be0be2b6d13927f6f48e2f358ec01d8afdcccec0573bb6aa82da6736c138857d3894f836660698ab5
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/uO:sLy2Kerc64CiGIm8so28O
TLSH
T128535C2AA5A220B8C95780B0D5776B32D4397C350036767EA345FF312E71E12EB25E9E
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/0x000900000001b871-4.dat	family_juko
behavioral2/files/0x000e00000001c563-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4900	WINWORD.exe
3480	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-1-5-21-1738198120-2966725515-3980530802-1000\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
2932	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	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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-08-01_00842b3071b8325470786d20e1d94413_elex_wannacry.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
860	PING.EXE
4844	PING.EXE
3388	PING.EXE
2932	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4844	PING.EXE
3388	PING.EXE
860	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4836 wrote to memory of 4900	4836	2026-08-01_00842b3071b8325470786d20e1d94413_elex_wannacry.exe	88
PID 4900 wrote to memory of 2932	4900	WINWORD.exe	89
PID 2932 wrote to memory of 860	2932	cmd.exe	91
PID 2932 wrote to memory of 4844	2932	cmd.exe	92
PID 2932 wrote to memory of 3388	2932	cmd.exe	93
PID 2932 wrote to memory of 3480	2932	cmd.exe	94

C:\Users\Admin\AppData\Local\Temp\2026-08-01_00842b3071b8325470786d20e1d94413_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-01_00842b3071b8325470786d20e1d94413_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4836
- 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:4900
- - 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\00005BA6" 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:2932
  - - 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:860
  - - 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:4844
  - - 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:3388
  - - 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:3480

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

00005BA6

Path C:\Users\Admin\AppData\Roaming\Mozilla\00005BA6
Size 64KB
SHA256 2cf90dc9bd75b0d815d98b15f8c8925a1f7dd17285c72dd2814c06721f9309de
MD5 a90e4f30187af8dee1fe2bd61d51fa71
SHA1 9c91f33c933355dda57106b15a01e63e2b01fa6c
SHA512 846e16c64528fdc6cadc5e09eb343f3e0f252a232af7899a7ce621ef6ef7b27f866e36cab3edf77e26ce79fecad107f6e27511617b078d3f04080e0cc4a1ace5
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/uF:sLy2Kerc64CiGIm8so28F
TLSH
T1EB535C2AA5A220B8C95780B0D5776B32D4397C350036767EA345FF312E71E12EB25E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 64KB
SHA256 819661ce09291bba04f89a49bfcaefea3d152e18d809200f059b8167e797578f
MD5 00842b3071b8325470786d20e1d94413
SHA1 6f26e2c42840edd8e3440f75ea4d2aca08f8d60e
SHA512 c2bcfb2f988462835d04be2ee6e8ee529cd7313ce478b21be0be2b6d13927f6f48e2f358ec01d8afdcccec0573bb6aa82da6736c138857d3894f836660698ab5
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/uO:sLy2Kerc64CiGIm8so28O
TLSH
T128535C2AA5A220B8C95780B0D5776B32D4397C350036767EA345FF312E71E12EB25E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

Replay Monitor

Loading Replay Monitor...

Downloads