juko | a07705abdd73cf4a8748a4891b76d24222e99fb14d1c17f2114724304d760ce0

General

Target
2026-08-18_c32c00505df55bda4ea33aa8b8e7791d_elex_wannacry.exe
Size 88KB
Sample260818-21scbstybt
SHA256 a07705abdd73cf4a8748a4891b76d24222e99fb14d1c17f2114724304d760ce0
MD5 c32c00505df55bda4ea33aa8b8e7791d
SHA1 56a14b5c927260932e3ee563e3727167a46c5da8
SHA512 a90eb5d30405f94f766391975f5c7379d0d72491a82a7cd612bcf1898aa295a9401c798f9624618a1d505d86bd7741f5af0650079d3c15008bee14f31e60bf77
SSDEEP 1536:5LsF2Kerc64sTiX2IV0DVk2Lbuzc/9yH8Ky9193jiT5l364KlVk937tgrF:5Ly2Kerc64CiGImRRLyzc/9yH8Ka193N
TLSH
T19D934A8F73251205D9770979A2052F19AC3DADE78357A04CA7C4B1693833D3ACB3F6A9
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/0x000e00000001c535-4.dat	family_juko
behavioral2/files/0x000f00000001c536-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
820	WINWORD.exe
4464	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-1-5-21-3797332335-34111092-3597280141-1000\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
3100	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	2026-08-18_c32c00505df55bda4ea33aa8b8e7791d_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
4008	PING.EXE
5460	PING.EXE
4740	PING.EXE
3100	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4008	PING.EXE
5460	PING.EXE
4740	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3412 wrote to memory of 820	3412	2026-08-18_c32c00505df55bda4ea33aa8b8e7791d_elex_wannacry.exe	89
PID 820 wrote to memory of 3100	820	WINWORD.exe	90
PID 3100 wrote to memory of 4008	3100	cmd.exe	92
PID 3100 wrote to memory of 5460	3100	cmd.exe	93
PID 3100 wrote to memory of 4740	3100	cmd.exe	94
PID 3100 wrote to memory of 4464	3100	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-18_c32c00505df55bda4ea33aa8b8e7791d_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-18_c32c00505df55bda4ea33aa8b8e7791d_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3412
- 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:820
- - 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\00003967" 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:3100
  - - 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:4008
  - - 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:5460
  - - 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:4740
  - - 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:4464

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

00003967

Path C:\Users\Admin\AppData\Roaming\Mozilla\00003967
Size 88KB
SHA256 a9e620d5622e653eb9ca6d17535cd5a3d1f5dee96b8e5fb56312e7fe3a8c0c29
MD5 ec089b9daa3864dd523ebf65aaecf571
SHA1 80bc194012b4d8d2ad3bf52a93b2be6d39302ac4
SHA512 a4b276a384b9f6784029fbc4749632aa5c0b5ade463484708ccae7a7048bfdc2fa67ce521de7994cabf0c98d6f0c2327c32a1c598ca67be0426e677bcd80d14c
SSDEEP 1536:5LsF2Kerc64sTiX2IV0DVk2Lbuzc/9yH8Ky9193jiT5l364KlVk937tgrT:5Ly2Kerc64CiGImRRLyzc/9yH8Ka193L
TLSH
T11D934A8F73251205D9770979A2052F19AC3DADE78357A04CA7C4B1693833D3ACB3F6A9
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 88KB
SHA256 a07705abdd73cf4a8748a4891b76d24222e99fb14d1c17f2114724304d760ce0
MD5 c32c00505df55bda4ea33aa8b8e7791d
SHA1 56a14b5c927260932e3ee563e3727167a46c5da8
SHA512 a90eb5d30405f94f766391975f5c7379d0d72491a82a7cd612bcf1898aa295a9401c798f9624618a1d505d86bd7741f5af0650079d3c15008bee14f31e60bf77
SSDEEP 1536:5LsF2Kerc64sTiX2IV0DVk2Lbuzc/9yH8Ky9193jiT5l364KlVk937tgrF:5Ly2Kerc64CiGImRRLyzc/9yH8Ka193N
TLSH
T19D934A8F73251205D9770979A2052F19AC3DADE78357A04CA7C4B1693833D3ACB3F6A9
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