juko | 0c211a2aec52365d0288beacefbbb1f6c1c6dba5cfdb1f0e4b02eca5e0bb5025

General

Target
2026-08-07_3298d1efc70713fcd3762f1141e7886e_elex_wannacry.exe
Size 95KB
Sample260807-yp3gdasfle
SHA256 0c211a2aec52365d0288beacefbbb1f6c1c6dba5cfdb1f0e4b02eca5e0bb5025
MD5 3298d1efc70713fcd3762f1141e7886e
SHA1 aaece30a627ce95fe73b4070d34957adbbd35185
SHA512 fe5672368b21927e33f85c49a41abc541fea7bd122b7b915a7807353ae45868a922ec701c4c6ee260b177d41bb1c7656f7b102ba3685d7d461add1af6daa758f
SSDEEP 1536:JLsF2Kerc64sTiX2IV0DXJrdShIPoANJLlAXuSXv+qSFEAeOFN9:JLy2Kerc64CiGIm7JrshIPFJRAhP2EAZ
TLSH
T12B93CF167B986052D88A0470CA7F4F3584397C791426E213B3D27A1F2DB2A52EF73ADD
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/1556-0-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral2/files/0x000a000000011380-5.dat	family_juko
behavioral2/memory/1556-9-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral2/memory/380-12-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral2/files/0x001100000001c481-13.dat	family_juko
behavioral2/memory/2964-15-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko
behavioral2/memory/2964-16-0x0000000000400000-0x000000000042B000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
380	WINWORD.exe
2964	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-1-5-21-2246396966-3025826688-3847171515-1000\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
5164	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	2026-08-07_3298d1efc70713fcd3762f1141e7886e_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
3248	PING.EXE
4104	PING.EXE
5164	cmd.exe
6060	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
6060	PING.EXE
3248	PING.EXE
4104	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1556 wrote to memory of 380	1556	2026-08-07_3298d1efc70713fcd3762f1141e7886e_elex_wannacry.exe	90
PID 380 wrote to memory of 5164	380	WINWORD.exe	91
PID 5164 wrote to memory of 6060	5164	cmd.exe	93
PID 5164 wrote to memory of 3248	5164	cmd.exe	94
PID 5164 wrote to memory of 4104	5164	cmd.exe	95
PID 5164 wrote to memory of 2964	5164	cmd.exe	96

C:\Users\Admin\AppData\Local\Temp\2026-08-07_3298d1efc70713fcd3762f1141e7886e_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-07_3298d1efc70713fcd3762f1141e7886e_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1556
- 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:380
- - 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\00004ECE" 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:5164
  - - 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:6060
  - - 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:3248
  - - 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:4104
  - - 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:2964

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

00004ECE

Path C:\Users\Admin\AppData\Roaming\Mozilla\00004ECE
Size 95KB
SHA256 5a0fe419f08404f8ee6a6ea77818a8a27e35fe1781d71d91f25b1a3b8231c200
MD5 08f628e81dc6126707d37225bab56552
SHA1 294eb882a3fb5ce64b857717de04eda7c877b30e
SHA512 1340df98d568e80afa230d4ae6eb9bcba6e3ce879b7460e56f29262e33a023ad301c0d3c4cd0f4332eddae2bd9da524897fba515d98f1301a8bf94143e581c60
SSDEEP 1536:JLsF2Kerc64sTiX2IV0DXJrdShIPoANJLlAXuSXv+qSFEAeOFNG:JLy2Kerc64CiGIm7JrshIPFJRAhP2EAi
TLSH
T13293CF167B986052D88A0470CA7F4F3584397C791426E213B3D27A1F2DB2A52EF73ADD
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 95KB
SHA256 0c211a2aec52365d0288beacefbbb1f6c1c6dba5cfdb1f0e4b02eca5e0bb5025
MD5 3298d1efc70713fcd3762f1141e7886e
SHA1 aaece30a627ce95fe73b4070d34957adbbd35185
SHA512 fe5672368b21927e33f85c49a41abc541fea7bd122b7b915a7807353ae45868a922ec701c4c6ee260b177d41bb1c7656f7b102ba3685d7d461add1af6daa758f
SSDEEP 1536:JLsF2Kerc64sTiX2IV0DXJrdShIPoANJLlAXuSXv+qSFEAeOFN9:JLy2Kerc64CiGIm7JrshIPFJRAhP2EAZ
TLSH
T12B93CF167B986052D88A0470CA7F4F3584397C791426E213B3D27A1F2DB2A52EF73ADD
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/380-12-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/1556-0-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/1556-9-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/2964-15-0x0000000000400000-0x000000000042B000-memory.dmp

Download

memory/2964-16-0x0000000000400000-0x000000000042B000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads