juko | cdcfcd16b7401da6263d1799583c1b9cd0a3d23c5c5efe721ac4029a3149cbde

General

Target
2026-08-02_cb097934b5e76dd85d1dd77f3396a6df_elex_wannacry.exe
Size 56KB
Sample260802-vcaztach53
SHA256 cdcfcd16b7401da6263d1799583c1b9cd0a3d23c5c5efe721ac4029a3149cbde
MD5 cb097934b5e76dd85d1dd77f3396a6df
SHA1 29d247486d560204a4e584374f81031b425bb8f1
SHA512 a7725e939cea149e5a831b4a52559ac21f87d3bbb1645529cced5be5785252a77d6327bb5e45f8b5300566a31a587ab4a5f83ab14520969e339d752a39f4dc63
SSDEEP 1536:PLsF2Kerc64sTiX2IV0DeRa8OKFVG9WGW2:PLy2Kerc64CiGImqRa8OKFE9WB2
TLSH
T12A4319277AE55CD2C15360F0EAE49B308038FD7219279023E794BB9816BEC92DF7169D
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 7 IoCs

resource	yara_rule
behavioral2/memory/4344-0-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/files/0x000c00000001b844-5.dat	family_juko
behavioral2/memory/4344-10-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/memory/2608-12-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/files/0x000d00000001c52b-13.dat	family_juko
behavioral2/memory/1736-15-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko
behavioral2/memory/1736-16-0x0000000000400000-0x0000000000422000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
2608	WINWORD.exe
1736	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-1-5-21-1079202589-886135813-2527035092-1000\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
4176	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	2026-08-02_cb097934b5e76dd85d1dd77f3396a6df_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
3924	PING.EXE
3996	PING.EXE
4176	cmd.exe
1712	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
1712	PING.EXE
3924	PING.EXE
3996	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4344 wrote to memory of 2608	4344	2026-08-02_cb097934b5e76dd85d1dd77f3396a6df_elex_wannacry.exe	89
PID 2608 wrote to memory of 4176	2608	WINWORD.exe	90
PID 4176 wrote to memory of 1712	4176	cmd.exe	92
PID 4176 wrote to memory of 3924	4176	cmd.exe	93
PID 4176 wrote to memory of 3996	4176	cmd.exe	94
PID 4176 wrote to memory of 1736	4176	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-02_cb097934b5e76dd85d1dd77f3396a6df_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-02_cb097934b5e76dd85d1dd77f3396a6df_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4344
- 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:2608
- - 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\00001B8C" 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:4176
  - - 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:1712
  - - 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:3924
  - - 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:3996
  - - 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:1736

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

00001B8C

Path C:\Users\Admin\AppData\Roaming\Mozilla\00001B8C
Size 56KB
SHA256 e80b6ac50254fb9f7819245311fa98ff3d7e89c669991906874c15cd656c499e
MD5 634c19dd2e0432f30f14dceadce97e68
SHA1 8d4d0d85f316fc9aa75ef04cc6ded178c24ed203
SHA512 3e525c44e1fbed31f99ea1d0b2a0667df5c71d9622fbaca71f46883a010e77dd1c2d7662580780e3e546db18c0cb88704190c23c5751b9548516b00365d866e6
SSDEEP 1536:PLsF2Kerc64sTiX2IV0DeRa8OKFVG9WGWV:PLy2Kerc64CiGImqRa8OKFE9WBV
TLSH
T1E44319277AE55CD2C15360F0EAE49B308038FD7219279023E794BB9816BEC92DF7169D
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 56KB
SHA256 cdcfcd16b7401da6263d1799583c1b9cd0a3d23c5c5efe721ac4029a3149cbde
MD5 cb097934b5e76dd85d1dd77f3396a6df
SHA1 29d247486d560204a4e584374f81031b425bb8f1
SHA512 a7725e939cea149e5a831b4a52559ac21f87d3bbb1645529cced5be5785252a77d6327bb5e45f8b5300566a31a587ab4a5f83ab14520969e339d752a39f4dc63
SSDEEP 1536:PLsF2Kerc64sTiX2IV0DeRa8OKFVG9WGW2:PLy2Kerc64CiGImqRa8OKFE9WB2
TLSH
T12A4319277AE55CD2C15360F0EAE49B308038FD7219279023E794BB9816BEC92DF7169D
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1736-15-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/1736-16-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/2608-12-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/4344-0-0x0000000000400000-0x0000000000422000-memory.dmp

Download

memory/4344-10-0x0000000000400000-0x0000000000422000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads