juko | c55644765ca88f980ccf50d9bccb5cdca390b2835c5eb6e8bdab95892619bb1d

General

Target
2026-08-09_b6f7cc9f11909b9500ae26518c48a50c_elex_wannacry.exe
Size 88KB
Sample260809-emykvszdqe
SHA256 c55644765ca88f980ccf50d9bccb5cdca390b2835c5eb6e8bdab95892619bb1d
MD5 b6f7cc9f11909b9500ae26518c48a50c
SHA1 0a6806011596743739838b7f299e51ee79188ab4
SHA512 2ee86cf951efc9ccfa1f8efa7218e812a5c50cf014697fc4f02ea72e4517fe2fb0b660cd0edc1eb20e9b8e5b6ed422b020c2486fc10d7afd9727f5624a9b4425
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrsB:sLy2Kerc64CiGIm8so28wzCBlycJWeei
TLSH
T1B9933B2EA5A220FCCA57C170C6BB6B32D4357C251035B63E6344FF352E70E62A729E59
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/0x000e000000016cdc-4.dat	family_juko
behavioral2/files/0x000d00000001c5e0-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
2524	WINWORD.exe
4488	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-1-5-21-552508041-2681165170-3229858294-1000\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
6044	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	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	2026-08-09_b6f7cc9f11909b9500ae26518c48a50c_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

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
5728	PING.EXE
6044	cmd.exe
5504	PING.EXE
1588	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
5728	PING.EXE
5504	PING.EXE
1588	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 6128 wrote to memory of 2524	6128	2026-08-09_b6f7cc9f11909b9500ae26518c48a50c_elex_wannacry.exe	89
PID 2524 wrote to memory of 6044	2524	WINWORD.exe	90
PID 6044 wrote to memory of 5504	6044	cmd.exe	92
PID 6044 wrote to memory of 1588	6044	cmd.exe	93
PID 6044 wrote to memory of 5728	6044	cmd.exe	94
PID 6044 wrote to memory of 4488	6044	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-09_b6f7cc9f11909b9500ae26518c48a50c_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-09_b6f7cc9f11909b9500ae26518c48a50c_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:6128
- 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:2524
- - 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\00005594" 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:6044
  - - 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:5504
  - - 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:1588
  - - 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:5728
  - - 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:4488

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

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Downloads

00005594

Path C:\Users\Admin\AppData\Roaming\Mozilla\00005594
Size 88KB
SHA256 dc1d137db28b395977254813aed59eeffb22c7b3761f68833df4e6d87c2b649f
MD5 cad3504f0b7a6eaa3f7a1b7da1cb1db4
SHA1 931691a4782d44fc897c2e0b045492ca5ab825ce
SHA512 68004d826e32a57dbe0e440922f4e640a51086f5404a422e8dc6712e038f6ee64d748e57ef56cf06cfdf28b1da71c4aaa4f74ecfad30badec0aa4882888f0608
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrsl:sLy2Kerc64CiGIm8so28wzCBlycJWeeW
TLSH
T1F2933B2EA5A220FCCA57C170C6BB6B32D4357C251035B63E6344FF352E70E62A729E59
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 88KB
SHA256 c55644765ca88f980ccf50d9bccb5cdca390b2835c5eb6e8bdab95892619bb1d
MD5 b6f7cc9f11909b9500ae26518c48a50c
SHA1 0a6806011596743739838b7f299e51ee79188ab4
SHA512 2ee86cf951efc9ccfa1f8efa7218e812a5c50cf014697fc4f02ea72e4517fe2fb0b660cd0edc1eb20e9b8e5b6ed422b020c2486fc10d7afd9727f5624a9b4425
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrsB:sLy2Kerc64CiGIm8so28wzCBlycJWeei
TLSH
T1B9933B2EA5A220FCCA57C170C6BB6B32D4357C251035B63E6344FF352E70E62A729E59
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