juko | bcef336c8dc75dddd1c96029d5bf94d40af4c8dac820ca018435faa2967743c2

General

Target
2026-07-04_4a6f3ce9c2cc128bd4f596fabe131bfc_elex_wannacry.exe
Size 64KB
Sample260704-e1by1sa13y
SHA256 bcef336c8dc75dddd1c96029d5bf94d40af4c8dac820ca018435faa2967743c2
MD5 4a6f3ce9c2cc128bd4f596fabe131bfc
SHA1 a205f061c6b05e90dbda8d982e734dec624e3416
SHA512 ba340cc6c6263ac94daa464f56299327fd32af6474904225204a087a0265d5d3232a3182b913eba46c21906ce403c4f515a861681bfda84b0ec88bd797607d86
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/ul:sLy2Kerc64CiGIm8so28l
TLSH
T11E535C2AA5A220B8C95780B0D5776B32D4397C350036767EA345FF312E71E12EB25E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

discovery juko persistence trojan

Malware Config

Signatures

Family: Juko
Juko is a trojan written in C++.
trojan juko

Detects Juko 2 IoCs

resource	yara_rule
behavioral2/files/0x0015000000011393-4.dat	family_juko
behavioral2/files/0x0009000000016d02-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
5372	WINWORD.exe
5972	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-1-5-21-2132828192-1552876075-2324613956-1000\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

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	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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-07-04_4a6f3ce9c2cc128bd4f596fabe131bfc_elex_wannacry.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
3744	cmd.exe
2072	PING.EXE
4568	PING.EXE
800	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2072	PING.EXE
4568	PING.EXE
800	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4372 wrote to memory of 5372	4372	2026-07-04_4a6f3ce9c2cc128bd4f596fabe131bfc_elex_wannacry.exe	88
PID 5372 wrote to memory of 3744	5372	WINWORD.exe	89
PID 3744 wrote to memory of 2072	3744	cmd.exe	91
PID 3744 wrote to memory of 4568	3744	cmd.exe	92
PID 3744 wrote to memory of 800	3744	cmd.exe	93
PID 3744 wrote to memory of 5972	3744	cmd.exe	94

C:\Users\Admin\AppData\Local\Temp\2026-07-04_4a6f3ce9c2cc128bd4f596fabe131bfc_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-04_4a6f3ce9c2cc128bd4f596fabe131bfc_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4372
- 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:5372
- - 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\00001356" WINWORD.exe&ping 127.0.0.1 -n 2&"C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" \r
    3⤵
    - System Location Discovery: System Language Discovery
    - System Network Configuration Discovery: Internet Connection Discovery
    - Suspicious use of WriteProcessMemory
    PID:3744
  - - 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:2072
  - - 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:4568
  - - 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:800
  - - 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:5972

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

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

00001356

Path C:\Users\Admin\AppData\Roaming\Mozilla\00001356
Size 64KB
SHA256 669a896fa6fcc09ca8780ec98b8cf9e0820444fea0604818b0ca517c326ee57f
MD5 b3a5c128475378f38e7616f5dc8585c2
SHA1 7c07df6fb4d01527b7a77219b374e662ba49e2af
SHA512 fc36f0bcaebfbf84e240e016c9220efd48c6f4e61cdb102c48a29ada32e6c99fd0a74aba5e55c82dae0b739911c8c3e9587331043351cf075706dc541474ce05
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/uV:sLy2Kerc64CiGIm8so28V
TLSH
T1AF535C2AA5A220B8C95780B0D5776B32D4397C350036767EA345FF312E71E12EB25E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 64KB
SHA256 bcef336c8dc75dddd1c96029d5bf94d40af4c8dac820ca018435faa2967743c2
MD5 4a6f3ce9c2cc128bd4f596fabe131bfc
SHA1 a205f061c6b05e90dbda8d982e734dec624e3416
SHA512 ba340cc6c6263ac94daa464f56299327fd32af6474904225204a087a0265d5d3232a3182b913eba46c21906ce403c4f515a861681bfda84b0ec88bd797607d86
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/ul:sLy2Kerc64CiGIm8so28l
TLSH
T11E535C2AA5A220B8C95780B0D5776B32D4397C350036767EA345FF312E71E12EB25E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads