juko | 2ef82ba3db8632b087393a23eca71e50484c303362e8bda758a35d67dd9a729a

General

Target
2026-07-23_1880b33f0e99f6aff6ab2fbf4a89a0c1_elex_wannacry.exe
Size 87KB
Sample260723-pfngesag63
SHA256 2ef82ba3db8632b087393a23eca71e50484c303362e8bda758a35d67dd9a729a
MD5 1880b33f0e99f6aff6ab2fbf4a89a0c1
SHA1 fb860ff7daf37ea14b5ef53373f693db177479d2
SHA512 3462273b0dd4e91fff1e2442074e09361b03cd435e81eb2ac28174dde265446ca1aa53ba70ca85cabae4290701e9182d24b0f55d4ea65e499e7456c0ec7ee226
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpQ:2Ly2Kerc64CiGIm1K851YO6EQkwpQ
TLSH
T1A293A1763A259190C48BD178E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
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/4732-0-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/files/0x000a0000000187ab-5.dat	family_juko
behavioral2/memory/4732-9-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/3304-12-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/files/0x000d00000001c529-13.dat	family_juko
behavioral2/memory/1928-15-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/1928-16-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
3304	WINWORD.exe
1928	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
4876	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	2026-07-23_1880b33f0e99f6aff6ab2fbf4a89a0c1_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
4876	cmd.exe
5184	PING.EXE
2632	PING.EXE
2444	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
5184	PING.EXE
2632	PING.EXE
2444	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4732 wrote to memory of 3304	4732	2026-07-23_1880b33f0e99f6aff6ab2fbf4a89a0c1_elex_wannacry.exe	89
PID 3304 wrote to memory of 4876	3304	WINWORD.exe	90
PID 4876 wrote to memory of 5184	4876	cmd.exe	92
PID 4876 wrote to memory of 2632	4876	cmd.exe	93
PID 4876 wrote to memory of 2444	4876	cmd.exe	94
PID 4876 wrote to memory of 1928	4876	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-07-23_1880b33f0e99f6aff6ab2fbf4a89a0c1_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-23_1880b33f0e99f6aff6ab2fbf4a89a0c1_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4732
- 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:3304
- - 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\000079C8" 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:4876
  - - 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:5184
  - - 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:2632
  - - 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:2444
  - - 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:1928

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

000079C8

Path C:\Users\Admin\AppData\Roaming\Mozilla\000079C8
Size 87KB
SHA256 89faa9c868f6d0948a284a7b8ee3606295eec1d2fc481a134a21d71a412ccfdd
MD5 cab52299e45312f7b1339d3d78809502
SHA1 b8a5ccfcddd5db0ace2fdce87fb7d974be6758e6
SHA512 8328d7bc29cce1b0ed84eac477dcaa01a48854e53e6b96481b33deb671a78ff5d786026614eeca7dcbecd335b6c6531e36fcfa0dacfdf8335a343fd46807c56b
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwp4:2Ly2Kerc64CiGIm1K851YO6EQkwp4
TLSH
T11D93A1763A259190C48BD178E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 87KB
SHA256 2ef82ba3db8632b087393a23eca71e50484c303362e8bda758a35d67dd9a729a
MD5 1880b33f0e99f6aff6ab2fbf4a89a0c1
SHA1 fb860ff7daf37ea14b5ef53373f693db177479d2
SHA512 3462273b0dd4e91fff1e2442074e09361b03cd435e81eb2ac28174dde265446ca1aa53ba70ca85cabae4290701e9182d24b0f55d4ea65e499e7456c0ec7ee226
SSDEEP 1536:2LsF2Kerc64sTiX2IV0DpK8SE9nYOzmEQkwpQ:2Ly2Kerc64CiGIm1K851YO6EQkwpQ
TLSH
T1A293A1763A259190C48BD178E8155AA0B932DCF52FF71303E6417AAC59B1E13CFAE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1928-15-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/1928-16-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/3304-12-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/4732-0-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/4732-9-0x0000000000400000-0x0000000000425000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads