juko | 4cc1b881cca471b2503097aa0ff9f268c6d6429726fe82616685344784d50ff8

General

Target
2026-08-01_4843e458a21c6de58828523c677ada84_elex_wannacry.exe
Size 88KB
Sample260802-a66y5abb65
SHA256 4cc1b881cca471b2503097aa0ff9f268c6d6429726fe82616685344784d50ff8
MD5 4843e458a21c6de58828523c677ada84
SHA1 44dd38deb36eee55364624c31d97cfdb4d572062
SHA512 f08d44eebad9a89d8500717eddd01054a25d4e1ac01589290e04bc9d48bcffbac7b73d44975611e9563cd3eb9599501991d96ffd9425a8e217ebd3f2b0dc0b00
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrsP:sLy2Kerc64CiGIm8so28wzCBlycJWeeo
TLSH
T12F933B2EA5A220FCCA57C170C6BB6B32D4357C251035B63E6344FF352E70E62A729E59
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/0x0012000000019a98-4.dat	family_juko
behavioral2/files/0x000f00000001c5ac-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4400	WINWORD.exe
3444	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-1-5-21-1875162379-3804078649-638427191-1000\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
4700	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_4843e458a21c6de58828523c677ada84_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
4700	cmd.exe
2148	PING.EXE
4532	PING.EXE
5108	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2148	PING.EXE
4532	PING.EXE
5108	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3452 wrote to memory of 4400	3452	2026-08-01_4843e458a21c6de58828523c677ada84_elex_wannacry.exe	88
PID 4400 wrote to memory of 4700	4400	WINWORD.exe	89
PID 4700 wrote to memory of 2148	4700	cmd.exe	91
PID 4700 wrote to memory of 4532	4700	cmd.exe	92
PID 4700 wrote to memory of 5108	4700	cmd.exe	93
PID 4700 wrote to memory of 3444	4700	cmd.exe	94

C:\Users\Admin\AppData\Local\Temp\2026-08-01_4843e458a21c6de58828523c677ada84_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-01_4843e458a21c6de58828523c677ada84_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3452
- 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:4400
- - 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\00003109" 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:4700
  - - 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:2148
  - - 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:4532
  - - 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:5108
  - - 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:3444

C:\Windows\system32\svchost.exe
C:\Windows\system32\svchost.exe -k GPSvcGroup
1⤵
PID:4080

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

00003109

Path C:\Users\Admin\AppData\Roaming\Mozilla\00003109
Size 88KB
SHA256 3fd4a08535d7e6f8b6bc98dbb575b9adb91b3e1c333822ad7629086071422485
MD5 6c2ce69b793402652e6222f89b89581d
SHA1 9ab4d1f384be753efc087c7a6e65592a7edc3699
SHA512 75e0ac7b000b0bb02f6563c81aafce3bc3fd1e16fd138392ed72d779c9911c53c8e59cf0cb058f7b55e87d18ae5b8af46fb608ad260d7d0609e9f69197bbd683
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrs2:sLy2Kerc64CiGIm8so28wzCBlycJWeed
TLSH
T192933B2EA5A220FCCA57C170C6BB6B32D4357C251035B63E6344FF352E70E62A729E59
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 88KB
SHA256 4cc1b881cca471b2503097aa0ff9f268c6d6429726fe82616685344784d50ff8
MD5 4843e458a21c6de58828523c677ada84
SHA1 44dd38deb36eee55364624c31d97cfdb4d572062
SHA512 f08d44eebad9a89d8500717eddd01054a25d4e1ac01589290e04bc9d48bcffbac7b73d44975611e9563cd3eb9599501991d96ffd9425a8e217ebd3f2b0dc0b00
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrsP:sLy2Kerc64CiGIm8so28wzCBlycJWeeo
TLSH
T12F933B2EA5A220FCCA57C170C6BB6B32D4357C251035B63E6344FF352E70E62A729E59
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