juko | 4238628b42d057dd1489495a76134b0948c0c5a16fe7dcfea95c296b8f5fd0b6

General

Target
2026-08-02_3b0bf65bf601498b545397000cd0f6cf_elex_wannacry.exe
Size 86KB
Sample260802-1sb5psgl4v
SHA256 4238628b42d057dd1489495a76134b0948c0c5a16fe7dcfea95c296b8f5fd0b6
MD5 3b0bf65bf601498b545397000cd0f6cf
SHA1 d82588f3f3756d8ebb2c2a090c94412b2f0b8b79
SHA512 c665c343b862e417e6c1e236827ad7f5d4c017a2ae202f46becabfd4cabfb0912b0e0f04519e1c27599e03ac8e9872f3ac20b314b91babd40a60f31d30b799b9
SSDEEP 1536:vLsF2Kerc64sTiX2IV0DYPu/ofmEQkwpI:vLy2Kerc64CiGImMPu/ouEQkwpI
TLSH
T1F383C2B2BA365011C48BD538E8189A60B922DCF43BF75753E3417AAC85B4D538FDE8C6
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/3912-0-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/files/0x000900000001b871-5.dat	family_juko
behavioral2/memory/3912-10-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/5988-12-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/files/0x000f00000001c563-13.dat	family_juko
behavioral2/memory/4680-15-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko
behavioral2/memory/4680-16-0x0000000000400000-0x0000000000425000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
5988	WINWORD.exe
4680	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-1-5-21-1738198120-2966725515-3980530802-1000\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
4068	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_3b0bf65bf601498b545397000cd0f6cf_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
2576	PING.EXE
4556	PING.EXE
4068	cmd.exe
2732	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2732	PING.EXE
2576	PING.EXE
4556	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3912 wrote to memory of 5988	3912	2026-08-02_3b0bf65bf601498b545397000cd0f6cf_elex_wannacry.exe	88
PID 5988 wrote to memory of 4068	5988	WINWORD.exe	89
PID 4068 wrote to memory of 2732	4068	cmd.exe	91
PID 4068 wrote to memory of 2576	4068	cmd.exe	92
PID 4068 wrote to memory of 4556	4068	cmd.exe	93
PID 4068 wrote to memory of 4680	4068	cmd.exe	94

C:\Users\Admin\AppData\Local\Temp\2026-08-02_3b0bf65bf601498b545397000cd0f6cf_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-02_3b0bf65bf601498b545397000cd0f6cf_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3912
- 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:5988
- - 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\00005AD9" 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:4068
  - - 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:2732
  - - 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:2576
  - - 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:4556
  - - 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:4680

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

00005AD9

Path C:\Users\Admin\AppData\Roaming\Mozilla\00005AD9
Size 86KB
SHA256 3cfee3914fc75db4de60087c4922d87a166beb0af7cbe1307a2316fe94a3e9ee
MD5 eddf2e3cfcf11bfd00906647298ad4ee
SHA1 40d549c376fa843d3930663d25693946f1433b4b
SHA512 244018f3885a144a4704509513fd52394fbd6d468c848fdaae7a4e519ce704ed017d1b84c3f6a233c7d290bbde43bc810d8f307516a494ac8713082dabc9539c
SSDEEP 1536:vLsF2Kerc64sTiX2IV0DYPu/ofmEQkwpc:vLy2Kerc64CiGImMPu/ouEQkwpc
TLSH
T13283C2B2BA365011C48BD538E8189A60B922DCF43BF75753E3417AAC85B4D538FDE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 86KB
SHA256 4238628b42d057dd1489495a76134b0948c0c5a16fe7dcfea95c296b8f5fd0b6
MD5 3b0bf65bf601498b545397000cd0f6cf
SHA1 d82588f3f3756d8ebb2c2a090c94412b2f0b8b79
SHA512 c665c343b862e417e6c1e236827ad7f5d4c017a2ae202f46becabfd4cabfb0912b0e0f04519e1c27599e03ac8e9872f3ac20b314b91babd40a60f31d30b799b9
SSDEEP 1536:vLsF2Kerc64sTiX2IV0DYPu/ofmEQkwpI:vLy2Kerc64CiGImMPu/ouEQkwpI
TLSH
T1F383C2B2BA365011C48BD538E8189A60B922DCF43BF75753E3417AAC85B4D538FDE8C6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/3912-0-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/3912-10-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/4680-15-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/4680-16-0x0000000000400000-0x0000000000425000-memory.dmp

Download

memory/5988-12-0x0000000000400000-0x0000000000425000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads