juko | da81824adcac29646214769e953ee2fd1f118440d1bfae2f42768d293854fbb4

General

Target
2026-08-01_ac143e14702f8a6cce5362c5659d90c8_elex_glassworm_wannacry.exe
Size 211KB
Sample260802-acf6lsaj81
SHA256 da81824adcac29646214769e953ee2fd1f118440d1bfae2f42768d293854fbb4
MD5 ac143e14702f8a6cce5362c5659d90c8
SHA1 8bab560850b0f1372751fe45babc97f1e814383d
SHA512 aed5656061c87df947f8f0172dd4d228fb2ef5fc5724e13642c47914e1832c6fbbaef21c185bf5ad19708355b49bf87115a55a30bb0c810d6d7812a4ab9751d9
SSDEEP 6144:jLy2Kwc64YIK628wzQocJje7RsUmWi5F1hLPBp6qoS:jkwcEO28wzmJje7Rsei5dhoS
TLSH
T1C2246B5AF7A220E5C55A82348ABB4731C634FC2414637B3E1780F6291DB6CA59F1AFDC
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/5048-0-0x0000000000400000-0x000000000044A000-memory.dmp	family_juko
behavioral2/files/0x00120000000118ee-5.dat	family_juko
behavioral2/memory/5048-10-0x0000000000400000-0x000000000044A000-memory.dmp	family_juko
behavioral2/memory/1232-12-0x0000000000400000-0x000000000044A000-memory.dmp	family_juko
behavioral2/files/0x000c00000001c638-13.dat	family_juko
behavioral2/memory/4376-15-0x0000000000400000-0x000000000044A000-memory.dmp	family_juko
behavioral2/memory/4376-16-0x0000000000400000-0x000000000044A000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
1232	WINWORD.exe
4376	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-1-5-21-1014449518-1831897916-4205727055-1000\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
2632	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	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-08-01_ac143e14702f8a6cce5362c5659d90c8_elex_glassworm_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

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
2632	cmd.exe
2700	PING.EXE
3676	PING.EXE
3416	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2700	PING.EXE
3676	PING.EXE
3416	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5048 wrote to memory of 1232	5048	2026-08-01_ac143e14702f8a6cce5362c5659d90c8_elex_glassworm_wannacry.exe	89
PID 1232 wrote to memory of 2632	1232	WINWORD.exe	90
PID 2632 wrote to memory of 2700	2632	cmd.exe	92
PID 2632 wrote to memory of 3676	2632	cmd.exe	93
PID 2632 wrote to memory of 3416	2632	cmd.exe	94
PID 2632 wrote to memory of 4376	2632	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-01_ac143e14702f8a6cce5362c5659d90c8_elex_glassworm_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-01_ac143e14702f8a6cce5362c5659d90c8_elex_glassworm_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5048
- 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:1232
- - 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\000043C3" 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: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:2700
  - - 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:3676
  - - 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:3416
  - - 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:4376

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

000043C3

Path C:\Users\Admin\AppData\Roaming\Mozilla\000043C3
Size 211KB
SHA256 045282cda9a735608e71279983ba891878aa1439c4a58862a6382fe8be54e586
MD5 720d7fbe0050b2d902402b766a26c4fe
SHA1 1850e23a7289f51a90233fd797924be593e872e0
SHA512 00ce7911b6793c0ddd440fe59f68bf42bcb4f181104abb0af6d2b2bcb5b7924e5dd1d2087976ae1afaa925830dae9efd4b674693e421e58c9eefbd3e25481b1d
SSDEEP 6144:jLy2Kwc64YIK628wzQocJje7RsUmWi5F1hLPBp6qox:jkwcEO28wzmJje7Rsei5dhox
TLSH
T161246B5AF7A220E5C55A82348ABB4731C634FC2414637B3E1780F6291DB6CA59F1AFDC
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 211KB
SHA256 da81824adcac29646214769e953ee2fd1f118440d1bfae2f42768d293854fbb4
MD5 ac143e14702f8a6cce5362c5659d90c8
SHA1 8bab560850b0f1372751fe45babc97f1e814383d
SHA512 aed5656061c87df947f8f0172dd4d228fb2ef5fc5724e13642c47914e1832c6fbbaef21c185bf5ad19708355b49bf87115a55a30bb0c810d6d7812a4ab9751d9
SSDEEP 6144:jLy2Kwc64YIK628wzQocJje7RsUmWi5F1hLPBp6qoS:jkwcEO28wzmJje7Rsei5dhoS
TLSH
T1C2246B5AF7A220E5C55A82348ABB4731C634FC2414637B3E1780F6291DB6CA59F1AFDC
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1232-12-0x0000000000400000-0x000000000044A000-memory.dmp

Download

memory/4376-15-0x0000000000400000-0x000000000044A000-memory.dmp

Download

memory/4376-16-0x0000000000400000-0x000000000044A000-memory.dmp

Download

memory/5048-0-0x0000000000400000-0x000000000044A000-memory.dmp

Download

memory/5048-10-0x0000000000400000-0x000000000044A000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads