juko | d439f4e06feaca3b425b1b3943447ba7fa9199e2ccded1168f796c2a0b81fa04

General

Target
2026-08-24_b8d9fede2229beceb19b668b3afafedb_elex_wannacry.exe
Size 49KB
Sample260825-dha4bswdrf
SHA256 d439f4e06feaca3b425b1b3943447ba7fa9199e2ccded1168f796c2a0b81fa04
MD5 b8d9fede2229beceb19b668b3afafedb
SHA1 da9416b604e095fe92a96b88b353cfd21b7f7850
SHA512 d30a5736ecb3f5ac0e72b88eea8760fbf32533fc2f3263ab2f47f82e51293ca53db87fbd3398e22c1b0cd294a93625357ca90188bea265461b9b53f900aceda5
SSDEEP 1536:4LsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2f:4Ly2Kerc64CiGImVu8p4kojWh2f
TLSH
T1B0334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
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/5644-0-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x001000000001b1d0-5.dat	family_juko
behavioral2/memory/5644-9-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/4152-12-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/files/0x001600000001c4a0-13.dat	family_juko
behavioral2/memory/5856-15-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko
behavioral2/memory/5856-16-0x0000000000400000-0x0000000000420000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4152	WINWORD.exe
5856	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
5480	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	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-08-24_b8d9fede2229beceb19b668b3afafedb_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

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
5480	cmd.exe
2004	PING.EXE
4760	PING.EXE
3908	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2004	PING.EXE
4760	PING.EXE
3908	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5644 wrote to memory of 4152	5644	2026-08-24_b8d9fede2229beceb19b668b3afafedb_elex_wannacry.exe	89
PID 4152 wrote to memory of 5480	4152	WINWORD.exe	90
PID 5480 wrote to memory of 2004	5480	cmd.exe	92
PID 5480 wrote to memory of 4760	5480	cmd.exe	93
PID 5480 wrote to memory of 3908	5480	cmd.exe	94
PID 5480 wrote to memory of 5856	5480	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-24_b8d9fede2229beceb19b668b3afafedb_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-24_b8d9fede2229beceb19b668b3afafedb_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5644
- 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:4152
- - 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\000056D2" 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:5480
  - - 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:2004
  - - 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:4760
  - - 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:3908
  - - 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:5856

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

000056D2

Path C:\Users\Admin\AppData\Roaming\Mozilla\000056D2
Size 49KB
SHA256 36260c1bc3b5dfcf6feaadfb17a70cc9bca7cd23b4b4bca248c5b75cbd63e65b
MD5 ff134284b567c7a7c54beb408fd6fc8a
SHA1 499e886c0d06d7323c5b5bbdcd91bda6ca68f879
SHA512 ca0f6af8e6cb02c9f1765016ad99363f626a80ba4a4eb16c3d49a736d3ba36f824e263e79b5b67390f57ab005a4400fd09445ac3437998e7e236eada77fa2f18
SSDEEP 1536:4LsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2/:4Ly2Kerc64CiGImVu8p4kojWh2/
TLSH
T13B334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 49KB
SHA256 d439f4e06feaca3b425b1b3943447ba7fa9199e2ccded1168f796c2a0b81fa04
MD5 b8d9fede2229beceb19b668b3afafedb
SHA1 da9416b604e095fe92a96b88b353cfd21b7f7850
SHA512 d30a5736ecb3f5ac0e72b88eea8760fbf32533fc2f3263ab2f47f82e51293ca53db87fbd3398e22c1b0cd294a93625357ca90188bea265461b9b53f900aceda5
SSDEEP 1536:4LsF2Kerc64sTiX2IV0Dhuj4p4kojVR6h2f:4Ly2Kerc64CiGImVu8p4kojWh2f
TLSH
T1B0334C0A2BD650C2D56205B0E99A0F75833FDC3A2127A75EE740765A1C72D6BCF30E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/4152-12-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/5644-0-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/5644-9-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/5856-15-0x0000000000400000-0x0000000000420000-memory.dmp

Download

memory/5856-16-0x0000000000400000-0x0000000000420000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads