juko | e5bbbf22bdf00977714750de3c8ede953918e9b3b5b24a41f050cfe5abba3728

General

Target
2026-07-02_b0304db6044eda05f888c7db80f7f056_elex_wannacry.exe
Size 88KB
Sample260702-gpydzscs9v
SHA256 e5bbbf22bdf00977714750de3c8ede953918e9b3b5b24a41f050cfe5abba3728
MD5 b0304db6044eda05f888c7db80f7f056
SHA1 0c870a6d95b8f1cf5d67b50eeee27e037bcab2e3
SHA512 ee02164326639aceece9292da407851809b371e02ac0efcfa701380d1eba076ea830e76f027b49acab33fe3c3ba82ed2efdc02336fca11e73323c02848d74824
SSDEEP 1536:zLsF2Kerc64sTiX2IV0D7c/wGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrsf:zLy2Kerc64CiGImHc/28wzCBlycJWeeY
TLSH
T1CB933C2EA59320FCCA5BC170C6BB6732D4357C251035B63E6344FB352E70E62AB29E59
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

discovery 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/4808-0-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral2/files/0x000e00000001b586-5.dat	family_juko
behavioral2/memory/4808-10-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral2/memory/1368-12-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral2/files/0x000f00000001c595-13.dat	family_juko
behavioral2/memory/4232-15-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral2/memory/4232-16-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
1368	WINWORD.exe
4232	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-1-5-21-2639994890-966400312-4246138405-1000\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

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	2026-07-02_b0304db6044eda05f888c7db80f7f056_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
712	PING.EXE
5360	PING.EXE
616	PING.EXE
2972	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
712	PING.EXE
5360	PING.EXE
616	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4808 wrote to memory of 1368	4808	2026-07-02_b0304db6044eda05f888c7db80f7f056_elex_wannacry.exe	88
PID 1368 wrote to memory of 2972	1368	WINWORD.exe	89
PID 2972 wrote to memory of 712	2972	cmd.exe	91
PID 2972 wrote to memory of 5360	2972	cmd.exe	92
PID 2972 wrote to memory of 616	2972	cmd.exe	93
PID 2972 wrote to memory of 4232	2972	cmd.exe	94

C:\Users\Admin\AppData\Local\Temp\2026-07-02_b0304db6044eda05f888c7db80f7f056_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-02_b0304db6044eda05f888c7db80f7f056_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4808
- 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:1368
- - 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\00006336" WINWORD.exe&ping 127.0.0.1 -n 2&"C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" \r
    3⤵
    - System Location Discovery: System Language Discovery
    - System Network Configuration Discovery: Internet Connection Discovery
    - Suspicious use of WriteProcessMemory
    PID:2972
  - - 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:712
  - - 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:5360
  - - 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:616
  - - 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:4232

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

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

00006336

Path C:\Users\Admin\AppData\Roaming\Mozilla\00006336
Size 88KB
SHA256 340ec5b3a09d2e92ebaa2def0a4b682be7e3547a072af3a7f745e0eb3d8ec470
MD5 5b24e3e3ca9602bad4c41f14f9f91673
SHA1 6005739e7b306d709dea9aa5f0e449aaf7d1010c
SHA512 553128c8d0c8aa887a99c9c37dd7907ce726057bf6aa45e2eb703587d6e27974e4305caddbfaf917e4d87165f49a6b824efe67f410495ea211806accb71f441d
SSDEEP 1536:zLsF2Kerc64sTiX2IV0D7c/wGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrsD:zLy2Kerc64CiGImHc/28wzCBlycJWeeY
TLSH
T1B7933C2EA59320FCCA5BC170C6BB6732D4357C251035B63E6344FB352E70E62AB29E59
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 88KB
SHA256 e5bbbf22bdf00977714750de3c8ede953918e9b3b5b24a41f050cfe5abba3728
MD5 b0304db6044eda05f888c7db80f7f056
SHA1 0c870a6d95b8f1cf5d67b50eeee27e037bcab2e3
SHA512 ee02164326639aceece9292da407851809b371e02ac0efcfa701380d1eba076ea830e76f027b49acab33fe3c3ba82ed2efdc02336fca11e73323c02848d74824
SSDEEP 1536:zLsF2Kerc64sTiX2IV0D7c/wGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrsf:zLy2Kerc64CiGImHc/28wzCBlycJWeeY
TLSH
T1CB933C2EA59320FCCA5BC170C6BB6732D4357C251035B63E6344FB352E70E62AB29E59
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1368-12-0x0000000000400000-0x000000000042A000-memory.dmp

Download

memory/4232-15-0x0000000000400000-0x000000000042A000-memory.dmp

Download

memory/4232-16-0x0000000000400000-0x000000000042A000-memory.dmp

Download

memory/4808-0-0x0000000000400000-0x000000000042A000-memory.dmp

Download

memory/4808-10-0x0000000000400000-0x000000000042A000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads