juko | 502df5bfc530b24cbe952519c8cee1619247847a6c88208607b30da9e038adbe

General

Target
2026-08-19_83ec39cd1eddf2ab27c595705dc31445_elex_wannacry.exe
Size 95KB
Sample260819-nef6aaee96
SHA256 502df5bfc530b24cbe952519c8cee1619247847a6c88208607b30da9e038adbe
MD5 83ec39cd1eddf2ab27c595705dc31445
SHA1 604b5cbc6ba6331ee6b110cf210f245a255742b5
SHA512 7ade0868b89cbc20df0181fd122a136db01fc865567791b3b44d9c5977d99ba917c0d15c10aa6915ac0000c3600e05ed49d2b78e6cc07800be1eb3819e569142
SSDEEP 1536:JLsF2Kerc64sTiX2IV0DXJrdShIPoANJLlAXuSXv+qSFEAeOFNo:JLy2Kerc64CiGIm7JrshIPFJRAhP2EAs
TLSH
T14693CF167B986052D88A0470CA7F4F3584397C791426E213B3D27A1F2DB2A52EF73ADD
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/4644-0-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral2/files/0x00170000000115f5-5.dat	family_juko
behavioral2/memory/4644-9-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral2/memory/5228-12-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral2/files/0x000e00000001c4d7-13.dat	family_juko
behavioral2/memory/2116-15-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral2/memory/2116-16-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
5228	WINWORD.exe
2116	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
5760	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	2026-08-19_83ec39cd1eddf2ab27c595705dc31445_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
3312	PING.EXE
4172	PING.EXE
3984	PING.EXE
5760	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3312	PING.EXE
4172	PING.EXE
3984	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4644 wrote to memory of 5228	4644	2026-08-19_83ec39cd1eddf2ab27c595705dc31445_elex_wannacry.exe	89
PID 5228 wrote to memory of 5760	5228	WINWORD.exe	90
PID 5760 wrote to memory of 3312	5760	cmd.exe	92
PID 5760 wrote to memory of 4172	5760	cmd.exe	93
PID 5760 wrote to memory of 3984	5760	cmd.exe	94
PID 5760 wrote to memory of 2116	5760	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-19_83ec39cd1eddf2ab27c595705dc31445_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-19_83ec39cd1eddf2ab27c595705dc31445_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4644
- 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:5228
- - 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\00007E52" 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:5760
  - - 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:3312
  - - 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:4172
  - - 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:3984
  - - 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:2116

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

00007E52

Path C:\Users\Admin\AppData\Roaming\Mozilla\00007E52
Size 95KB
SHA256 c6e7528502ed903ca054bed21faf0a7eb5dc5970f6f7f8d2c7990eba818fae9d
MD5 8b261f1c0fb72fb5a0ea701f1f29cb96
SHA1 e70b9ec53c24075fdb104550db9a6000dc28e077
SHA512 de817952967c3f8c45ed1cc0d57ddf1c5b2b1126bdd9b9cd626018d7b53bacffc4e4e2edee262aedc976884cb64436292208e055224cadf38ec657558bcd5482
SSDEEP 1536:JLsF2Kerc64sTiX2IV0DXJrdShIPoANJLlAXuSXv+qSFEAeOFN+:JLy2Kerc64CiGIm7JrshIPFJRAhP2EAq
TLSH
T13C93CF167B986052D88A0470CA7F4F3584397C791426E213B3D27A1F2DB2A52EF73ADD
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 95KB
SHA256 502df5bfc530b24cbe952519c8cee1619247847a6c88208607b30da9e038adbe
MD5 83ec39cd1eddf2ab27c595705dc31445
SHA1 604b5cbc6ba6331ee6b110cf210f245a255742b5
SHA512 7ade0868b89cbc20df0181fd122a136db01fc865567791b3b44d9c5977d99ba917c0d15c10aa6915ac0000c3600e05ed49d2b78e6cc07800be1eb3819e569142
SSDEEP 1536:JLsF2Kerc64sTiX2IV0DXJrdShIPoANJLlAXuSXv+qSFEAeOFNo:JLy2Kerc64CiGIm7JrshIPFJRAhP2EAs
TLSH
T14693CF167B986052D88A0470CA7F4F3584397C791426E213B3D27A1F2DB2A52EF73ADD
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2116-15-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/2116-16-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/4644-0-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/4644-9-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/5228-12-0x0000000000400000-0x000000000042B000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads