juko | da696796e37a6c95a57a86c59e882f97c1503f9d1682b77cfd9e718212123ac6

General

Target
2026-08-02_9411d94b7c4a1d102890f82dcd98dd09_elex_wannacry.exe
Size 95KB
Sample260802-v6hazsdd39
SHA256 da696796e37a6c95a57a86c59e882f97c1503f9d1682b77cfd9e718212123ac6
MD5 9411d94b7c4a1d102890f82dcd98dd09
SHA1 1680ff7ab244364b6d693c95f34442ed6710b1a1
SHA512 bd189c06821cd3c1fe6c44b69edac6c7d9fed337a3c3707fba90af928df0c7db418e3896d2c24d5901b7fab5a1be98353482175701f7b719a19e2095d91e51fc
SSDEEP 1536:ELsF2Kerc64sTiX2IV0DeRJdShIPoANJLlAXuSXv+qSFEAeOFNq:ELy2Kerc64CiGImqRJshIPFJRAhP2EAm
TLSH
T11793BE176B985052D88A0570CA7F4F3584387C791426E223B7C27A1F2DB2A52EF73ADD
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/4676-0-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral2/files/0x000d00000001c645-5.dat	family_juko
behavioral2/memory/4676-10-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral2/memory/5488-12-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral2/files/0x000e00000001c646-13.dat	family_juko
behavioral2/memory/4012-15-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral2/memory/4012-16-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
5488	WINWORD.exe
4012	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
2136	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	2026-08-02_9411d94b7c4a1d102890f82dcd98dd09_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

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
2136	cmd.exe
5128	PING.EXE
5548	PING.EXE
2980	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
5128	PING.EXE
5548	PING.EXE
2980	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4676 wrote to memory of 5488	4676	2026-08-02_9411d94b7c4a1d102890f82dcd98dd09_elex_wannacry.exe	88
PID 5488 wrote to memory of 2136	5488	WINWORD.exe	89
PID 2136 wrote to memory of 5128	2136	cmd.exe	91
PID 2136 wrote to memory of 5548	2136	cmd.exe	92
PID 2136 wrote to memory of 2980	2136	cmd.exe	93
PID 2136 wrote to memory of 4012	2136	cmd.exe	94

C:\Users\Admin\AppData\Local\Temp\2026-08-02_9411d94b7c4a1d102890f82dcd98dd09_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-02_9411d94b7c4a1d102890f82dcd98dd09_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4676
- 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:5488
- - 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\00005BD7" 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:2136
  - - 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:5128
  - - 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:5548
  - - 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:2980
  - - 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:4012

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

00005BD7

Path C:\Users\Admin\AppData\Roaming\Mozilla\00005BD7
Size 95KB
SHA256 6e1477c1b92ca4441d93f457d6a7288a2cb17b494fca4cfacfd0e85ebb1ffe42
MD5 663c3436b720d2949e5818f3bb1bc7f1
SHA1 9701db9afa2ed0e9621d677d16cd9949cf0eff25
SHA512 6bbb51ecaa41251805dd0508c1bd976d9d14d52126d2a579d2a836c87c4ae1dbe2f5c089034e824ffb802e558ab06424d3554f54112f829eaf21510eeb561a65
SSDEEP 1536:ELsF2Kerc64sTiX2IV0DeRJdShIPoANJLlAXuSXv+qSFEAeOFNp:ELy2Kerc64CiGImqRJshIPFJRAhP2EAl
TLSH
T1E693BE176B985052D88A0570CA7F4F3584387C791426E223B7C27A1F2DB2A52EF73ADD
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 95KB
SHA256 da696796e37a6c95a57a86c59e882f97c1503f9d1682b77cfd9e718212123ac6
MD5 9411d94b7c4a1d102890f82dcd98dd09
SHA1 1680ff7ab244364b6d693c95f34442ed6710b1a1
SHA512 bd189c06821cd3c1fe6c44b69edac6c7d9fed337a3c3707fba90af928df0c7db418e3896d2c24d5901b7fab5a1be98353482175701f7b719a19e2095d91e51fc
SSDEEP 1536:ELsF2Kerc64sTiX2IV0DeRJdShIPoANJLlAXuSXv+qSFEAeOFNq:ELy2Kerc64CiGImqRJshIPFJRAhP2EAm
TLSH
T11793BE176B985052D88A0570CA7F4F3584387C791426E223B7C27A1F2DB2A52EF73ADD
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/4012-15-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/4012-16-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/4676-0-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/4676-10-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/5488-12-0x0000000000400000-0x000000000042B000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads